Sleeving / Re-boring / Forging...
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Greetings fellow zitizens.
Alright so I got a friend who races and builds Supras for a living. He knows a ton about FI and engines in general, and has told me that if I intend to keep the car long, and put FI on it, I should invest in rebuilding the engine internals.
Now I'm not exactly familiar with the entire process of engine rebuilding and what purpose each step has, but I do know that it's very expensive...
My questions are the following:
1) Other than letting me run higher boost, how does rebuilding internals make the engine last longer ? I mean, say after 150k miles... would a rebuilt engine still be going strong or would you have to replace it anyway ?
2) Can someone familiar with each process give me a summary of what they do? i.e - sleeving, boring, pistons & rods, etc..
Thanks =)
Alright so I got a friend who races and builds Supras for a living. He knows a ton about FI and engines in general, and has told me that if I intend to keep the car long, and put FI on it, I should invest in rebuilding the engine internals.
Now I'm not exactly familiar with the entire process of engine rebuilding and what purpose each step has, but I do know that it's very expensive...
My questions are the following:
1) Other than letting me run higher boost, how does rebuilding internals make the engine last longer ? I mean, say after 150k miles... would a rebuilt engine still be going strong or would you have to replace it anyway ?
2) Can someone familiar with each process give me a summary of what they do? i.e - sleeving, boring, pistons & rods, etc..
Thanks =)
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I should also add that I just spoke with him and he thinks it's crazy for us to be running 8psi+ on an engine with such high compression. He highly recommends putting lower-compression stronger pistons & rods into the engine, allowing for much higher boost and engine longevity.
What do you guys think of that ?
What do you guys think of that ?
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Originally posted by zimbo
I think I'm going to grow bored of this car before the engine blows.
--Steve
I think I'm going to grow bored of this car before the engine blows.
--Steve
I have to agree. Really not worth dumping that much money into. Though I have spent quite a bit so far
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#8
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Forged internals WILL last longer if you go F/I. Cast internals are not designed for the long-term us of F/I, and the higher temps and cylinder pressures created. Forged low-comp interals will resist detonation better, and be MUCH stronger. The stock rods are about the thickness of my index finger.....long and thin...not good for high HP applications.
Regarding the costs of going forged. The biggest piece is the labor involved. Some people would recommend sleeving, if you plan on running more than 500-600rwhp.
Regarding the costs of going forged. The biggest piece is the labor involved. Some people would recommend sleeving, if you plan on running more than 500-600rwhp.
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Originally posted by slay2k
I should also add that I just spoke with him and he thinks it's crazy for us to be running 8psi+ on an engine with such high compression. He highly recommends putting lower-compression stronger pistons & rods into the engine, allowing for much higher boost and engine longevity.
What do you guys think of that ?
I should also add that I just spoke with him and he thinks it's crazy for us to be running 8psi+ on an engine with such high compression. He highly recommends putting lower-compression stronger pistons & rods into the engine, allowing for much higher boost and engine longevity.
What do you guys think of that ?
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Originally posted by 350Zteve
You will not increase the life of your engine just by putting forged internals in it...all other variables equal. The forged internals allow you to run high boost levels.
You will not increase the life of your engine just by putting forged internals in it...all other variables equal. The forged internals allow you to run high boost levels.
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Originally posted by shivak
On boosted motors, what are generally the first parts to go?
On boosted motors, what are generally the first parts to go?
Anything can go first. I don't this question can accurately be answered. It could be the rings, pistons, or rods....flip a coin. If I was a betting man, I'd say the pistons.
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Originally posted by shivak
On boosted motors, what are generally the first parts to go?
On boosted motors, what are generally the first parts to go?
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my bet is on the head gasket under high boost first, but as far as internals it would likely be the con rods. the pistons are not too shabby and the crank is forged.
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Not longevity, unless you overboost the stock internals. If you overboost the stock internals, your engine blows fast... so longevity might be a matter of blowing your engine vs. not blowing your engine.
All things being equal, no, your engine will not last longer.
All things being equal, no, your engine will not last longer.
#17
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Originally posted by slay2k
You sure it wont prolong normal longevity ? My friend said it would...
You sure it wont prolong normal longevity ? My friend said it would...
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Originally posted by slay2k
You sure it wont prolong normal longevity ? My friend said it would...
You sure it wont prolong normal longevity ? My friend said it would...
If you run into detonation because and injector gets clogged or you have someone tune your car poorly, you will blow the motor regardless of what internals you have. Detonation will destroy any type of piston, period.
If you have no plans of running power above what the motor is safely handling at the current time, then upgrading to forged parts is a waste. If you plan on running more boost, you may exceed what the stock parts can safely handle.
One thing to keep in mind, stock parts can handle ALOT of power but you MUST make sure the tune up is correct.
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Originally posted by 350Zteve
If you have no plans of running power above what the motor is safely handling at the current time, then upgrading to forged parts is a waste.
If you have no plans of running power above what the motor is safely handling at the current time, then upgrading to forged parts is a waste.
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With either forged or cast internals there are no guarantees with FI. Either set-up can blow up just the same. With the forged internals you have more of a safety net if you're tuning is off. That margin for error is not there on cast internals.