Building a motor w/ 12.1-12.8 CR?
I am currently building a motor to drop into my 1987 CRX Si.
Here are the components so far:
B18A Block
81.5 Endyn Rollerwave Pistons (High Comp. 12.1-12.8)
Crower Rods
B16A Sir I Head (stock)
I am also going to add:
Type-R Int. Man.
JUN UL FW
Mild Headwork
SGT or any other motor building GURU, what do you think about this setup?
I still haven't decided on tuning. Either Hondata or EFI PMS. I am looking to get 200 WHP. For some reason though, I am thinking that the pistons that I ordered are too high CR. I live in Utah where 4400+ Above Sea Level is an every day reality. I want to use this car as a daily driver as well. Any suggestions, comments or flames would be greatly appreciated. THANKS!
Here are the components so far:
B18A Block
81.5 Endyn Rollerwave Pistons (High Comp. 12.1-12.8)
Crower Rods
B16A Sir I Head (stock)
I am also going to add:
Type-R Int. Man.
JUN UL FW
Mild Headwork
SGT or any other motor building GURU, what do you think about this setup?
I still haven't decided on tuning. Either Hondata or EFI PMS. I am looking to get 200 WHP. For some reason though, I am thinking that the pistons that I ordered are too high CR. I live in Utah where 4400+ Above Sea Level is an every day reality. I want to use this car as a daily driver as well. Any suggestions, comments or flames would be greatly appreciated. THANKS!
It really depends on the cams you are going to use.
With smaller milder cams i generally wont go above 11.5-12:1 due to detonation
concerns. I use 12+ compression for big cams that need it. You can use
the pistons you have, though you may run into detonation issues.
With smaller milder cams i generally wont go above 11.5-12:1 due to detonation
concerns. I use 12+ compression for big cams that need it. You can use
the pistons you have, though you may run into detonation issues.
SGT - I was thinking of putting in some Skunk2 Stage 2 Cams or CTR Cams. Would the CTR cams help with the detonating? If I use stock cams, will I have to dump alot of timing?
Put some Toda B's in it and run it on Hondata it's defiately the way too go. CTR' will work fine but once you go with high compression you'll begin to max out the limit of the cams. JUN3's can generate some crazy *** power too it's just that I have seen too many people shatter them!!!
I already have JUN III's in my ITR w/ JDM ITR Pistons and Mugen Head Gasket and I still don't think I have high enough compression for those cams. I think I will go with Skunk2 Stage 2 Cams since this is a budget build. Any other recommendations on this build? With the setup listed above with the Skunk2 Cams, what kind oh hp numbers do you guys think I can expect to put down? Dumb question, yes I know, but I guess if I ask a dumb question, I can expect dumb answers. Bring them on! 
Thanks guys.

Thanks guys.
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kart_driver
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