32hp pistons????

[GatorS14]

http://cgi.ebay.com/ebaymotors...33623

what do you think?

thank you

[Rownan]

All they are are KA24E SOHC pistons. In the DOHC KA they will bring the compression ratio to 11.6:1, but I will warn you the KA will NOT run on pump gas at this compression, and the ECU will need to be retuned. I doubt even if you ran at 11.6:1 compression on race fuel you would get 32hp out of that, but I suppose that maybe it is possible.

Timhttp://www.projectaspec.com

[JJ240]

Well I think you should search...there are two other posts that specifically talk about the ebay pistons.

[robertwb70]

COMPRESSION ALONE DOES NOT CONTRIBUTE AS MUCH AS MOST PEOPLE THINK-my research sayseach point of comp. increase=3-4% power increase-stock ka-24de-9.5to1-up to11.6to1=12.6hp increase(assuming stock 150hp)and you would have to retard the timing so much to run even the best pump gas you would probably lose twice that much!

why most new cars have relatively high comp. is efficiency which increases in greater proportion than power(7-8%per point)

modern engine controls are the only reason anything more than 9to1 is possible.

research from david vizard's many books

[encasemyheart]

Adding compression has diminishing returns, the higher you get the less hp you make. Expecially above 10-11:1 compression, the gains aren't really worth tearing apart the motor for that purpose alone.

[robertwb70]

exactly-that and the mods req.to realize the expected results make engines much less "streetable" any thing above about 1 hp per cube starts to get into race car zone-but then most of us enthusiast are willing to make some sacrafices

horsepower cost money-how fast can you afford to go?

[crashjust4kix]

if running E pistons on a DE brings the c.r. up, than wouldn't the opposite be true as well? cheap low compression pistons for the early motor turbo crowd, maybe?

[robertwb70]

yes-but stock replacement pistons are mostly cast-not good for turbo mods

not sure about 16 valve pistons-but i do know z-24 and ka12valve pistons interchange the z has .060dish the kaE has .020 dish

i would think de pistons would swap too(same bore+stroke+rod length)

[Nismo1182]

what year Z-24?

[robertwb70]

the one i rebuilt was 1985-but im pretty sure they're all the same.

just to make sure-z-24 is the engine name for nissan 2.4L-8valve-8spark plug-smog engine(but it does make alot of torq)

not to be confused with the chevy car z-24

[McAdam]

yeah, but if you ran some cams with that or just dialed in a bit more overlap with some adjustable sprockets and brought the dynamic compression down a tad, wouldn't you be able to run pump gas?? primo pump gas, but pump gas none the less . just a thought

McAdam

[robertwb70]

yes that is how most knowledgeble engine builders make the extra power on the motor. an engine is a system no one part can make what most of us want of it-theres a balance-you either go with a known combo or make improvements and test and tune to get the most out of it.increasing the comp. tends to make up the power lost at lower rpm from a bigger cam(more overlap)IMO-they naturaly go together.

the only way to know for sure how far you can push all the variables is with lots of dyno time-which i cant afford-we are all probably not making the power we could be.

check some dyno websites and see the power increases from measured tuning.