Rotaries don't have a valvetrain (unless you count the rotor).
BTW Eli, rotaries are 4-stroke engines.
DivideBYZero
Lifer
- May 18, 2001
- 24,117
- 2
- 0
No doubt from the Mitsubishi tech pile, as they have had GDI(Gasoline Direct Injection) in production since '96.
Originally posted by: kumanchu
you forgot the research that saab is doing on variable compression
Eli, thanks for the info.
I read up on SAAB's variable compression motor. Apparnetly, they 'tilt' the motor or the heads (forgot) to change compression...seems pretty interesting.
Originally posted by: Eli
Well, rotaries use oil injection to lubricate the apex seals, AFAIK.
In a traditional 2-cycle engine, you have to mix oil with the gas because there is no seperate oil sump. Some more advanced 2-cycles have a seperate oil tank, and use oil-injection. Still the same principal though.. the mixed oil/fuel lubricates the mains/crank/cylinder as it's pumped through the engine. It's just more user friendly, typically found on things like snowmobiles and scooters.
If it's a craftsman mower, it's probably a Briggs and Stratton engine. They're cheap, fairly reliable with proper maintenance.. and fun to tinker with.
I wouldn't recommend running it without the air filter though, heh. You'll suck nasties up... Indeed, they are very loud with no muffler.
As for something to tinker with, if it's your main mower.. I wouldn't bother. When I was younger, I called up all the small engine places in the phone book and asked if they had any horizonal shaft engines that were in the junk pile that they'd sell me for cheap. Picked 3 up for like 20 bucks, and made 2 running engines out of them.
You could also find a 25$ mower in the paper, but honestly a horizonal shaft is more fun because you don't have to worry about a blade, and you can bolt it to your bench so it's at working level. Can also look on eBay.
Some fun things to do:
1) Run with no oil. See how many times it will freeze up before it throws the rod.
2) With cast iron engines, clog the cooling air intake and run it until the head is glowing a nice cherry red. Makes a dramatic effect at night.
3) Put half a tube of valve grinding compound into the oil. Run the engine until it won't run anymore, and then tear it apart and observe damage. This lets you know how important oil filters are in cars. You can feel the lip in the cylinder, and the mains are usually so sloppy the flywheel will rub the magneto.
4) Stick it full throttle, see how long it will run.
5) Use your imagination
Design a tuned exhaust for it and a big bore carb. See how much power/rpm you can get before it blows up.
Run it on R/C car fuel with 50% nitro. LOL!
Originally posted by: FrustratedUser
Originally posted by: Eli
Well, rotaries use oil injection to lubricate the apex seals, AFAIK.
In a traditional 2-cycle engine, you have to mix oil with the gas because there is no seperate oil sump. Some more advanced 2-cycles have a seperate oil tank, and use oil-injection. Still the same principal though.. the mixed oil/fuel lubricates the mains/crank/cylinder as it's pumped through the engine. It's just more user friendly, typically found on things like snowmobiles and scooters.
If it's a craftsman mower, it's probably a Briggs and Stratton engine. They're cheap, fairly reliable with proper maintenance.. and fun to tinker with.
I wouldn't recommend running it without the air filter though, heh. You'll suck nasties up... Indeed, they are very loud with no muffler.
As for something to tinker with, if it's your main mower.. I wouldn't bother. When I was younger, I called up all the small engine places in the phone book and asked if they had any horizonal shaft engines that were in the junk pile that they'd sell me for cheap. Picked 3 up for like 20 bucks, and made 2 running engines out of them.
You could also find a 25$ mower in the paper, but honestly a horizonal shaft is more fun because you don't have to worry about a blade, and you can bolt it to your bench so it's at working level. Can also look on eBay.
Some fun things to do:
1) Run with no oil. See how many times it will freeze up before it throws the rod.
2) With cast iron engines, clog the cooling air intake and run it until the head is glowing a nice cherry red. Makes a dramatic effect at night.
3) Put half a tube of valve grinding compound into the oil. Run the engine until it won't run anymore, and then tear it apart and observe damage. This lets you know how important oil filters are in cars. You can feel the lip in the cylinder, and the mains are usually so sloppy the flywheel will rub the magneto.
4) Stick it full throttle, see how long it will run.
5) Use your imagination
Design a tuned exhaust for it and a big bore carb. See how much power/rpm you can get before it blows up.
Run it on R/C car fuel with 50% nitro. LOL!
Is there a way to control the throttle in those? Or are they set to run at a certain RPM? I'm pretty they can rev a little higher, and possible make more power.
Originally posted by: mAdD INDIAN
Originally posted by: kumanchu
you forgot the research that saab is doing on variable compression
Eli, thanks for the info.
I read up on SAAB's variable compression motor. Apparnetly, they 'tilt' the motor or the heads (forgot) to change compression...seems pretty interesting.
The engine block is split above the crank shaft and below the heads and the top part is tilted.
Really cool stuff.
Combined with a turbo = Mmmmm
Oh, dur.
Yes, of course. If you follow the cable down, it will attach to the throttle somewhere on the carburetor. The throttle cable will be attached to a bracket, and there will be a spring from the bracket to the actual throttle plate control.
Kinda hard to explain I guess. Can't find any pics, either. It's really simple, though. If you poke around enough with the engine idling.. you'll know when you find it.
The Highest setting(rabbit) is usually only around 2600 - 2800RPM, the engine will rev much higher than that. The valves will float at probably 5500 - 6500RPM.
Originally posted by: Eli
Oh, dur.
Yes, of course. If you follow the cable down, it will attach to the throttle somewhere on the carburetor. The throttle cable will be attached to a bracket, and there will be a spring from the bracket to the actual throttle plate control.
Kinda hard to explain I guess. Can't find any pics, either. It's really simple, though. If you poke around enough with the engine idling.. you'll know when you find it.
The Highest setting(rabbit) is usually only around 2600 - 2800RPM, the engine will rev much higher than that. The valves will float at probably 5500 - 6500RPM.
It's a four-stroke?
2-strokes are more fun IMHO.
Originally posted by: Eli
Oh, dur.
Yes, of course. If you follow the cable down, it will attach to the throttle somewhere on the carburetor. The throttle cable will be attached to a bracket, and there will be a spring from the bracket to the actual throttle plate control.
Kinda hard to explain I guess. Can't find any pics, either. It's really simple, though. If you poke around enough with the engine idling.. you'll know when you find it.
The Highest setting(rabbit) is usually only around 2600 - 2800RPM, the engine will rev much higher than that. The valves will float at probably 5500 - 6500RPM.
Sweet! With VTEC it'll HIT 8000RPMS!
No seriously, I didn't no they were capable for going that high. I was just staring at the intake and exhaust portions of the engine (they are on the same side..and quite close together). I was thinking...if one could fabricate a pipe that would go from the exhaust "hole" to the smallest turbo possible which would then feed air back into the intake. Sounds feasible...impractical..but feasible and FUN!Also other idea, what would happen if one were to squirt a few drops of Nitrous oxide into the intake??
They don't really make 2-stroke lawnmowers anymore... Convienence factors.Originally posted by: FrustratedUser
Originally posted by: Eli
Oh, dur.
Yes, of course. If you follow the cable down, it will attach to the throttle somewhere on the carburetor. The throttle cable will be attached to a bracket, and there will be a spring from the bracket to the actual throttle plate control.
Kinda hard to explain I guess. Can't find any pics, either. It's really simple, though. If you poke around enough with the engine idling.. you'll know when you find it.
The Highest setting(rabbit) is usually only around 2600 - 2800RPM, the engine will rev much higher than that. The valves will float at probably 5500 - 6500RPM.
It's a four-stroke?
2-strokes are more fun IMHO.
Personally, I enjoy 4-strokes more... but 2-strokes are interesting too. I dislike their longevity, or lack thereof. Just can't beat having a dedicated oil sump.
What about the Honda Mini 4-strokes?
Very cool.
5500RPMs isn't really anything. There is a huge karting world that mods the standard 5HP Briggs engines to turn 8000-9000RPM. Performance carbs, cams, billet rods, shaved heads.. It's fun stuff.Originally posted by: mAdD INDIAN
Originally posted by: Eli
Oh, dur.
Yes, of course. If you follow the cable down, it will attach to the throttle somewhere on the carburetor. The throttle cable will be attached to a bracket, and there will be a spring from the bracket to the actual throttle plate control.
Kinda hard to explain I guess. Can't find any pics, either. It's really simple, though. If you poke around enough with the engine idling.. you'll know when you find it.
The Highest setting(rabbit) is usually only around 2600 - 2800RPM, the engine will rev much higher than that. The valves will float at probably 5500 - 6500RPM.
Sweet! With VTEC it'll HIT 8000RPMS!
Also other idea, what would happen if one were to squirt a few drops of Nitrous oxide into the intake??
Heck, the Honda GXH50 on my scooter has a redline of 7800RPM, but I've had 'er up to 8430RPM or so.
It's certainly possible to fit a small engine with a turbo..
Turbocharged Honda GC160 project
As for the nitrous.. It would probably rev like crazy. But like I said, the RPM limiting factors in these stock small engines are the valve springs and connecting rod. If it didn't throw the rod at you missile-like, I'd be surprised.
Originally posted by: Eli
5500RPMs isn't really anything. There is a huge karting world that mods the standard 5HP Briggs engines to turn 8000-9000RPM. Performance carbs, cams, billet rods, shaved heads.. It's fun stuff.Originally posted by: mAdD INDIAN
Originally posted by: Eli
Oh, dur.
Yes, of course. If you follow the cable down, it will attach to the throttle somewhere on the carburetor. The throttle cable will be attached to a bracket, and there will be a spring from the bracket to the actual throttle plate control.
Kinda hard to explain I guess. Can't find any pics, either. It's really simple, though. If you poke around enough with the engine idling.. you'll know when you find it.
The Highest setting(rabbit) is usually only around 2600 - 2800RPM, the engine will rev much higher than that. The valves will float at probably 5500 - 6500RPM.
Sweet! With VTEC it'll HIT 8000RPMS!
Also other idea, what would happen if one were to squirt a few drops of Nitrous oxide into the intake??
Heck, the Honda GXH50 on my scooter has a redline of 7800RPM, but I've had 'er up to 8430RPM or so.
It's certainly possible to fit a small engine with a turbo..
Turbocharged Honda GC135 project
As for the nitrous.. It would probably rev like crazy. But like I said, the RPM limiting factors in these stock small engines are the valve springs and connecting rod. If it didn't throw the rod at you missile-like, I'd be surprised.
I meant for a lawnmower, 5000RPM is pretty cool, although if the blade wasn't connected properly to the shaft, I'd be screwed at those speeds.
Regarding turbo's on small engines, I've seen Cornell Uni's SAE car in action...it has a 600cc motorcycle engine that is turboed..makes sweet sounds..but at the time, the performacne gains weren't that great.
Your scooter only has a 60cc engine? What kinda tranny is it? I know the the Scootys (in India) are mated to either a 2-spd auto or a CVT and make about 4hp in a 60cc motor. The Scooters however, make a tad bit more...but are decently fast.
heh, I tried drifting the Scooty on gravel and ended up having to put bandaids on my ankle, foot, and hands.
EDIT: the pics loaded on your site...so you attached a small motor to your foot-pedal scooters? Your insane! I love it! I thought you meant you had a real scooter powered by a 60cc engine something similar to this.
50cc, actually. No "real" transmission, just a centrifical clutch - one gear. It's a go-ped type scooter, not the street-legal (with brake lights, turn signals, etc) like the Honda Sprees or whatever.Originally posted by: mAdD INDIAN
Originally posted by: Eli
5500RPMs isn't really anything. There is a huge karting world that mods the standard 5HP Briggs engines to turn 8000-9000RPM. Performance carbs, cams, billet rods, shaved heads.. It's fun stuff.Originally posted by: mAdD INDIAN
Originally posted by: Eli
Oh, dur.
Yes, of course. If you follow the cable down, it will attach to the throttle somewhere on the carburetor. The throttle cable will be attached to a bracket, and there will be a spring from the bracket to the actual throttle plate control.
Kinda hard to explain I guess. Can't find any pics, either. It's really simple, though. If you poke around enough with the engine idling.. you'll know when you find it.
The Highest setting(rabbit) is usually only around 2600 - 2800RPM, the engine will rev much higher than that. The valves will float at probably 5500 - 6500RPM.
Sweet! With VTEC it'll HIT 8000RPMS!
Also other idea, what would happen if one were to squirt a few drops of Nitrous oxide into the intake??
Heck, the Honda GXH50 on my scooter has a redline of 7800RPM, but I've had 'er up to 8430RPM or so.
It's certainly possible to fit a small engine with a turbo..
Turbocharged Honda GC135 project
As for the nitrous.. It would probably rev like crazy. But like I said, the RPM limiting factors in these stock small engines are the valve springs and connecting rod. If it didn't throw the rod at you missile-like, I'd be surprised.
I meant for a lawnmower, 5000RPM is pretty cool, although if the blade wasn't connected properly to the shaft, I'd be screwed at those speeds.
Regarding turbo's on small engines, I've seen Cornell Uni's SAE car in action...it has a 600cc motorcycle engine that is turboed..makes sweet sounds..but at the time, the performacne gains weren't that great.
Your scooter only has a 60cc engine? What kinda tranny is it? I know the the Scootys (in India) are mated to either a 2-spd auto or a CVT and make about 4hp in a 60cc motor. The Scooters however, make a tad bit more...but are decently fast.
heh, I tried drifting the Scooty on gravel and ended up having to put bandaids on my ankle, foot, and hands.
2.9166:1 primary drive and a 2.2222:1 secondary drive, final drive ratio of 6.48:1. Top speed is 40MPH @ 8000RPM with 9.5" tires.
- Mar 20, 2000
- 102,402
- 8,574
- 126
Originally posted by: Eli
50cc, actually. No "real" transmission, just a centrifical clutch - one gear. It's a go-ped type scooter, not the street-legal (with brake lights, turn signals, etc) like the Honda Sprees or whatever.Originally posted by: mAdD INDIAN
Originally posted by: Eli
5500RPMs isn't really anything. There is a huge karting world that mods the standard 5HP Briggs engines to turn 8000-9000RPM. Performance carbs, cams, billet rods, shaved heads.. It's fun stuff.Originally posted by: mAdD INDIAN
Originally posted by: Eli
Oh, dur.
Yes, of course. If you follow the cable down, it will attach to the throttle somewhere on the carburetor. The throttle cable will be attached to a bracket, and there will be a spring from the bracket to the actual throttle plate control.
Kinda hard to explain I guess. Can't find any pics, either. It's really simple, though. If you poke around enough with the engine idling.. you'll know when you find it.
The Highest setting(rabbit) is usually only around 2600 - 2800RPM, the engine will rev much higher than that. The valves will float at probably 5500 - 6500RPM.
Sweet! With VTEC it'll HIT 8000RPMS!
Also other idea, what would happen if one were to squirt a few drops of Nitrous oxide into the intake??
Heck, the Honda GXH50 on my scooter has a redline of 7800RPM, but I've had 'er up to 8430RPM or so.
It's certainly possible to fit a small engine with a turbo..
Turbocharged Honda GC135 project
As for the nitrous.. It would probably rev like crazy. But like I said, the RPM limiting factors in these stock small engines are the valve springs and connecting rod. If it didn't throw the rod at you missile-like, I'd be surprised.
I meant for a lawnmower, 5000RPM is pretty cool, although if the blade wasn't connected properly to the shaft, I'd be screwed at those speeds.
Regarding turbo's on small engines, I've seen Cornell Uni's SAE car in action...it has a 600cc motorcycle engine that is turboed..makes sweet sounds..but at the time, the performacne gains weren't that great.
Your scooter only has a 60cc engine? What kinda tranny is it? I know the the Scootys (in India) are mated to either a 2-spd auto or a CVT and make about 4hp in a 60cc motor. The Scooters however, make a tad bit more...but are decently fast.
heh, I tried drifting the Scooty on gravel and ended up having to put bandaids on my ankle, foot, and hands.
2.9166:1 primary drive and a 2.2222:1 secondary drive, final drive ratio of 6.48:1. Top speed is 40MPH @ 8000RPM with 9.5" tires.
I edited my earlier post. When you said scooter, I thought you meant something similar to
this.. I really gotta try out whta you did though. Is it easy to control? How do you control throttle?
Nope, it wasn't a foot-push scooter.Originally posted by: mAdD INDIAN
Originally posted by: Eli
50cc, actually. No "real" transmission, just a centrifical clutch - one gear. It's a go-ped type scooter, not the street-legal (with brake lights, turn signals, etc) like the Honda Sprees or whatever.Originally posted by: mAdD INDIAN
Originally posted by: Eli
5500RPMs isn't really anything. There is a huge karting world that mods the standard 5HP Briggs engines to turn 8000-9000RPM. Performance carbs, cams, billet rods, shaved heads.. It's fun stuff.Originally posted by: mAdD INDIAN
Originally posted by: Eli
Oh, dur.
Yes, of course. If you follow the cable down, it will attach to the throttle somewhere on the carburetor. The throttle cable will be attached to a bracket, and there will be a spring from the bracket to the actual throttle plate control.
Kinda hard to explain I guess. Can't find any pics, either. It's really simple, though. If you poke around enough with the engine idling.. you'll know when you find it.
The Highest setting(rabbit) is usually only around 2600 - 2800RPM, the engine will rev much higher than that. The valves will float at probably 5500 - 6500RPM.
Sweet! With VTEC it'll HIT 8000RPMS!
Also other idea, what would happen if one were to squirt a few drops of Nitrous oxide into the intake??
Heck, the Honda GXH50 on my scooter has a redline of 7800RPM, but I've had 'er up to 8430RPM or so.
It's certainly possible to fit a small engine with a turbo..
Turbocharged Honda GC135 project
As for the nitrous.. It would probably rev like crazy. But like I said, the RPM limiting factors in these stock small engines are the valve springs and connecting rod. If it didn't throw the rod at you missile-like, I'd be surprised.
I meant for a lawnmower, 5000RPM is pretty cool, although if the blade wasn't connected properly to the shaft, I'd be screwed at those speeds.
Regarding turbo's on small engines, I've seen Cornell Uni's SAE car in action...it has a 600cc motorcycle engine that is turboed..makes sweet sounds..but at the time, the performacne gains weren't that great.
Your scooter only has a 60cc engine? What kinda tranny is it? I know the the Scootys (in India) are mated to either a 2-spd auto or a CVT and make about 4hp in a 60cc motor. The Scooters however, make a tad bit more...but are decently fast.
heh, I tried drifting the Scooty on gravel and ended up having to put bandaids on my ankle, foot, and hands.
2.9166:1 primary drive and a 2.2222:1 secondary drive, final drive ratio of 6.48:1. Top speed is 40MPH @ 8000RPM with 9.5" tires.
I edited my earlier post. When you said scooter, I thought you meant something similar to
this.. I really gotta try out whta you did though. Is it easy to control? How do you control throttle?
It is this scooter. The stock 33cc 2-stroke died after about a year and a half, so I put my own engine on it.
Yeah, it's easy to control. Throttle is by the brake-lever looking thing on the right side of the handlebars(next to the red-kill switch button) in the pics. The left hand lever is the brake.
The stock scooter went about 23MPH, so it was quite an upgrade. Kinda scary when you hit bumps. :Q
That's a 2-stroke engine.
8000RPM actually is something for a stock 4-stroke engine. That's one of the reasons I chose the Honda GXH50, there are very few 4-strokes that rev that high without extensive modifications. Gotta love Honda.
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