Question about Compression-haters....CARS BABY

[Goosemaster]

1. My Honda Accord is in the shop.
2. I am driving my Dad's 1995 Izuzu Rodeo...no AC:|


My Dad keeps telling me that the engine in the rodeo has does not take well to adding a lot of compression..i.e..engine braking...



My question is: What problem does this engine have with the added compression?
I've heard that all rodeo's have this characteristic but would like an explanation as to why

 

[DougK62]

What?

 

[Goosemaster]

Its high-compression, pent-roof center-plug combustion chambers are fed fuel through sequential multi-point fuel injection, and fired by a direct ignition system, providing excellent power and fuel economy.

So then it is under heavy compression already...and engine braking just increases the load causing problems....?

 

[Goosemaster]

Originally posted by: DougK62
What?

lol

 

[DougK62]

Seriously - what are you talking about? You make no sense.

 

[Ronstang]

Engine braking does not put undo stress on the engine unless you throw it into a gear way to low for the speed you are traveling. If you know how to drive then everything will be fine, it is the idiots in this world who keep auto mechanics employed.

 

[LAUST]

isn't the Isuzu V6 a 10:1 compression motor?

that is higher then the average car on the road, but it's nothing special.

 

[Goosemaster]

Originally posted by: Ronstang
Engine braking does not put undo stress on the engine unless you throw it into a gear way to low for the speed you are traveling. If you know how to drive then everything will be fine, it is the idiots in this world who keep auto mechanics employed.

Still, I have heard that this engine DOES NOT TOLERATE it at all.

Its high-compression, pent-roof center-plug combustion chambers are fed fuel through sequential multi-point fuel injection, and fired by a direct ignition system, providing excellent power and fuel economy

It seems like the engine is under extreme pressure during noraml use...more son than other engine types.

 

[Goosemaster]

Originally posted by: LAUST
isn't the Isuzu V6 a 10:1 compression motor?

that is higher then the average car on the road, but it's nothing special.

oh, so engine braking is fine then?


I was just interested in learning more about the vehicle. After I was told that I shouldn't ______, I just had to find out why.

 

[DougK62]

Engine braking does not add any more compression to the engine - that's absurd.

 

[LAUST]

Originally posted by: Goosemaster

Originally posted by: LAUST
isn't the Isuzu V6 a 10:1 compression motor?

that is higher then the average car on the road, but it's nothing special.

oh, so engine braking is fine then?


I was just interested in learning more about the vehicle. After I was told that I shouldn't ______, I just had to find out why.

never hurts to ask whats up

but if you got 4 wheel disk brakes anyway I'd use the brakes Disk brakes are nice and easy to change... when I had my 69 with 4 wheel drum you can bet I was a downshifter then

 

[Ronstang]

My Shelby has 11:1 compression and I use engine braking all the time and I guarantee you it is worth alot more than some Isuzu and more expensive to fix. The engine you speak of does not tolerate idots well.....it has nothing to do with engine braking though.

 

[ElFenix]

engine breaking is good on long downslopes

 

[Pacfanweb]

Originally posted by: DougK62
Engine braking does not add any more compression to the engine - that's absurd.

Exactly. Engine braking simply uses what's already there to slow the car.

BTW, love the Sammy Hagar quote....I was just listening to that song and album on the way home.

 

[RU482]

I don't know jack about engines, but the first thing that came to mind is that the head gasket is probably too weak to handle higher compression (i.e. what engine braking would do to the engine)

Does that make any sense?

 

[Mani]

Engine braking uses the internal friction in your engine to slow the car down. Has nothing to do with the compression ratio. It's generally not a bad thing to engine brake, but it does add that much more wear and tear to the engine, and given that pads cost next to nothing to replace compared to engine parts, there is no reason to use the engine to brake.

 

[Ronstang]

Originally posted by: redly1
I don't know jack about engines, but the first thing that came to mind is that the head gasket is probably too weak to handle higher compression (i.e. what engine braking would do to the engine)

Does that make any sense?

NO

 

[Ronstang]

Originally posted by: Mani
Engine braking uses the internal friction in your engine to slow the car down. Has nothing to do with the compression ratio. It's generally not a bad thing to engine brake, but it does add that much more wear and tear to the engine, and given that pads cost next to nothing to replace compared to engine parts, there is no reason to use the engine to brake.

Wrong

 

[IamElectro]

Originally posted by: LAUST
isn't the Isuzu V6 a 10:1 compression motor?

that is higher then the average car on the road, but it's nothing special.

10:1 is average or close to average most of your honda engines run that or a little higher the new toyota gt-s runs 11.5:1

 

[Pacfanweb]

Originally posted by: Mani
Engine braking uses the internal friction in your engine to slow the car down. Has nothing to do with the compression ratio. It's generally not a bad thing to engine brake, but it does add that much more wear and tear to the engine, and given that pads cost next to nothing to replace compared to engine parts, there is no reason to use the engine to brake.

Did you post this just to see how many people would jump on you to tell you you're wrong or do you really believe that???

That is so wrong it's funny. Engine braking is ALL ABOUT THE COMPRESSION. There is practically NO internal friction...that's why everything is floating on pressurized oil.
Books are your friend.....read many, young grasshopper.

 

[Mani]

Originally posted by: Pacfanweb

Originally posted by: Mani
Engine braking uses the internal friction in your engine to slow the car down. Has nothing to do with the compression ratio. It's generally not a bad thing to engine brake, but it does add that much more wear and tear to the engine, and given that pads cost next to nothing to replace compared to engine parts, there is no reason to use the engine to brake.

Did you post this just to see how many people would jump on you to tell you you're wrong or do you really believe that???

That is so wrong it's funny. Engine braking is ALL ABOUT THE COMPRESSION. There is practically NO internal friction...that's why everything is floating on pressurized oil.
Books are your friend.....read many, young grasshopper.

Just thought I'd add a bit more misinformation to the thread.

 

[Goosemaster]

Originally posted by: Pacfanweb

Originally posted by: Mani
Engine braking uses the internal friction in your engine to slow the car down. Has nothing to do with the compression ratio. It's generally not a bad thing to engine brake, but it does add that much more wear and tear to the engine, and given that pads cost next to nothing to replace compared to engine parts, there is no reason to use the engine to brake.

Did you post this just to see how many people would jump on you to tell you you're wrong or do you really believe that???

That is so wrong it's funny. Engine braking is ALL ABOUT THE COMPRESSION. There is practically NO internal friction...that's why everything is floating on pressurized oil.
Books are your friend.....read many, young grasshopper.

So then this engine cannot take the compression? Or is it fine?

When I engine-brake in my Accord the rpms stay around 2-3k

 

[Iron Woode]

Originally posted by: Goosemaster

Originally posted by: Pacfanweb

Originally posted by: Mani
Engine braking uses the internal friction in your engine to slow the car down. Has nothing to do with the compression ratio. It's generally not a bad thing to engine brake, but it does add that much more wear and tear to the engine, and given that pads cost next to nothing to replace compared to engine parts, there is no reason to use the engine to brake.

Did you post this just to see how many people would jump on you to tell you you're wrong or do you really believe that???

That is so wrong it's funny. Engine braking is ALL ABOUT THE COMPRESSION. There is practically NO internal friction...that's why everything is floating on pressurized oil.
Books are your friend.....read many, young grasshopper.

So then this engine cannot take the compression? Or is it fine?

When I engine-brake in my Accord the rpms stay around 2-3k

Stop posting.

 

[d33pt]

engine braking doesn't make your engine compress any more than usual

 

[KokomoGST]

the compression ratio doesn't change when you engine brake... in fact, the compression ratio on 99.999999% of cars NEVER changes.

There are some race engine naturally aspirated engines, like the Hondas and Neons in sport compact all motor drag classes that run over 12:1. A lot of high performance road cars now run 10:1, even 11:1 compression ratios.