Yah the size though is just off the hook, but then again I LOVE the ability to work on my own engines and I like to do it with room, I almost bought a F-150 in 1999, the deciding factor was the F-150 is a shoehorn job. I don't mind OHV engines. I know people are on a OHC kick again but I doubt most of them do their own work.
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DOHC
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Bulk Beef
Diamond Member
The benefit of a third valve and the benefit of variable valve timing are two separate issues. A third (or fourth) valve increases port area, improving breathing. Changes in cam timing (relative to crank angle) alter power characteristics, even if lift and duration are static. The valve timing that yields the best low-end torque probably won't be the best for top-end power - VVT attempts to overcome that.
Demon-Xanth
Lifer
Laust: I wish I could find that pick of a Ford 4.6 DOHC sitting beside a 5.0 🙂
Goosemaster: I've always been interesting in exactly how engines work. I've spent many hours just staring at cut away drawings and I've done a good deal of maintenance on my own cars... but I'm an electronics tech in an engineering dept. (far from a gear head). I've learned alot of the practical stuff by doing maintenance and hanging out with gear heads, and the theoretical stuff by reading up on various articles, checking out cut away drawings, and ignoring buzz words. Buzz words just muddle everything up. Most every engine works the same way, it's just how they get it to work that's different.
Goosemaster: I've always been interesting in exactly how engines work. I've spent many hours just staring at cut away drawings and I've done a good deal of maintenance on my own cars... but I'm an electronics tech in an engineering dept. (far from a gear head). I've learned alot of the practical stuff by doing maintenance and hanging out with gear heads, and the theoretical stuff by reading up on various articles, checking out cut away drawings, and ignoring buzz words. Buzz words just muddle everything up. Most every engine works the same way, it's just how they get it to work that's different.
GalvanizedYankee
Diamond Member
Just to add to the mix...
The single most important valve timing event is when the intake valve/s closes.
If intake velocity is high(300fps), with good flow efficientcey. Cylinder filling can be as high
115%. When running short twisty tracks some of the better racers use properly
ported 750cc heads on 1000cc engines. This set-up clips some top end power
but really enhances the mid range power band.
This is because air-fuel mix is still filling the cylinder as the piston is just starting to come up the bore. Velocity of the charge is the key in a NA engine. Thats why many cars
have dual intake tracks.........:sun:
The single most important valve timing event is when the intake valve/s closes.
If intake velocity is high(300fps), with good flow efficientcey. Cylinder filling can be as high
115%. When running short twisty tracks some of the better racers use properly
ported 750cc heads on 1000cc engines. This set-up clips some top end power
but really enhances the mid range power band.
This is because air-fuel mix is still filling the cylinder as the piston is just starting to come up the bore. Velocity of the charge is the key in a NA engine. Thats why many cars
have dual intake tracks.........:sun:
WinkOsmosis
Banned
Umm.. Yeah they made more than 380hp... They were also like 7 litres....
FelixDeCat
Lifer
7 litres?! 😕 Talk about ineffeciency. Today it would only take a 4.0 litre.
Demon-Xanth
Lifer
Well, both Chevy and Dodge have 2 valve engines that put out 345HP from 5.7L and are cheap, and Chevy has a hopped up varient (LS6 in the Z06) making 405, Dodge has had some pictures of a 6.1L Hemi that is supposed to make 425HP and 425LB/ft. And the 5.8L engines in NASCAR's Winston Cup all make 800-820HP, even with the intake restrictions, 425HP w/ the tighter restrictor plates. One thing to consider about these 2V engines, is that they're cheap compared to thier DOHC alternatives, and can fit into a smaller engine bay.
HP/L is just another excuse to use when you lose.
Always look at what something costs before trying to do a direct comparison. I can get 502HP for $7200 or 330HP for $2300. How much would it take to get a Honda engine to make that much reliable HP?
HP/L is just another excuse to use when you lose.
Always look at what something costs before trying to do a direct comparison. I can get 502HP for $7200 or 330HP for $2300. How much would it take to get a Honda engine to make that much reliable HP?
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