motor rebuild, what to replace?
#16
The thing about putting together a combo is that it's never as easy as it sounds. I don't think I would try the 33cc dished pistons with the AFR heads. You'd probably start to have a problem with quench. 8.5 to 9:1 is really about all you need with a FI street car to run on pump gas. You'd be really surprised at what 12 psi will get you.
96LT1, I'm not sure what you mean here...
383 w/ heads/cam and 150 shot sounds fun.... but how much will the 383 lose N/A that it could have w/ a smaller(?) dish piston and higher compression? This FI the more I read seems like such a hard project that its not even worth it.... is that the truth?
FI isn't a hard concept. It's doling out thousands of dollars in parts and labor that most people can't handle.
96LT1, I'm not sure what you mean here...
383 w/ heads/cam and 150 shot sounds fun.... but how much will the 383 lose N/A that it could have w/ a smaller(?) dish piston and higher compression? This FI the more I read seems like such a hard project that its not even worth it.... is that the truth?
FI isn't a hard concept. It's doling out thousands of dollars in parts and labor that most people can't handle.
#17
I meant, in an N/A application how much more HP will the 383 w/ 10.8:1 compression make than the one w/ 9.0:1
If the 9.0:1 383 makes a lot less (which I'm pretty sure it does) it wouldn't be worth making it unless I had the bottle/turbo ready... if it is not much of a difference though, it would be worth building it w/ low compression first off and wait till I have the money for turbo/nitrous.
If the 9.0:1 383 makes a lot less (which I'm pretty sure it does) it wouldn't be worth making it unless I had the bottle/turbo ready... if it is not much of a difference though, it would be worth building it w/ low compression first off and wait till I have the money for turbo/nitrous.
#18
I believe the general rule of thumb is that if two motors are built the same with compression being the only difference, you will gain or lose 3% for every full point of compression. It's not a whole lot, it's really all in the heads and cam.
#19
Originally posted by 97WS6SCharged
I believe the general rule of thumb is that if two motors are built the same with compression being the only difference, you will gain or lose 3% for every full point of compression. It's not a whole lot, it's really all in the heads and cam.
I believe the general rule of thumb is that if two motors are built the same with compression being the only difference, you will gain or lose 3% for every full point of compression. It's not a whole lot, it's really all in the heads and cam.
Rich Krause
#20
I'm planning on rebuilding my motor also. Here in my town there is a great shop for stock engine parts (one of the cheapest in the country). I'm picking up the complete short block kit for $373. It comes with alot (pistons, rings, cam, crank, gaskets). I'm also picking up reman. heads for $335. They are all stock spec. though. If you want perf. you need to add $$$
#21
Originally posted by rskrause
It's not that large unless the initial CR is very low. As the CR rises, each incremental is less. IOW, going from 5:1 to 6:1 is a 20% increase but going from 10:1 to 11:1 is only 10%, and so on I have the table somewhere if anyone is curious for the real numbers. In the usual range is 1-2% per point.
Rich Krause
It's not that large unless the initial CR is very low. As the CR rises, each incremental is less. IOW, going from 5:1 to 6:1 is a 20% increase but going from 10:1 to 11:1 is only 10%, and so on I have the table somewhere if anyone is curious for the real numbers. In the usual range is 1-2% per point.
Rich Krause
Robert K is right. + = $$
Ps. We need more smileys in this forum.
Pss. Rich, at what point (head chamber size/piston dish size) would one start to have a problem with quench? 93z96svt was wondering about problems using SRP/JE 33cc dished pistons with AFR 76cc heads. I don't think it would be a good idea, but I've been wrong before.
Last edited by 97WS6SCharged; 06-10-2004 at 11:00 PM.
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