compression isn't needed to make power.

Omniman is pushing 228whp outta his b20vtec, using stock b20z phk pistons and some other methods to raise the compression to 10.6:1

It's all about making things work together. I will admit that higher compression will make the low end a lot better however.


as for his question, just any piston manufacturer should have what you need. I like CP pistons and haven't heard anything bad about them. Personally I would use oem pistons if you are into drag racing. the time period of a drag race isn't enough to require forged pistons or oil squirters, although both help.

If you are into road racing ditch the ls block and get one with squirters and then use oem pistons lol. OEM pistons are cheap, reliable as fawk, and proven.. plus there are so many types to choose from that you can make about any CR you want

 

What are the "other ways" of making power. Air + Fuel + spark ?? Thanks for all notes. I want this beast to eat regular 91 octane. I have 370cc injectors available. I can procure a 190 lph fuel pump and an AEM fuel line /pressure regulator. Can I still use my P72 ECU if I get close to 12 to 1 compression??
I was told that the P72 can be tuned upon completion. Am I operating on false perceptions? The 190 lph pump was supposed to flow freely and the fuel pressure regulator was supposed to allow the 310cc injectors to operate at a resonable duty cycle %. The 11 to 1 compression allows any fuel type and reduces the sidewall pressure from the lousy stroke ratio of the LS crank?
I know that 12 to 1 is stretching the compression limit for using reg gasoline.
So I want to stay away from that limit. What is the real deal ?
I am not looking for another block. I know this block has good sleeves and no cracks.
I will look for the aftermarket pistons mentioned by the good posters and couple them with my eagle H rods. OK, I'll go to 11.23 to 1 ?? HAhaHA.
So what about the other methods of making power?? I'm interested. Thanks to all you mugwumps for your time and contributions.

 

12:1 can be run fine you just need to get more fuel into the engine.... doesnt the s2k have like 12:1 compression out of the box?

 

resleeve and bore :rick:

agreed....on most parts.

if running forged pistons the oil squirters arent really necessary. trying to install them into a b18a/b block isnt easy.

if you're sticking to the stock bore oem pistons are a great solution. you can get your c/r anywhere from 10:1 all the way up to 13:1. but since you say you have 91oct then stick to 11:1-12:1.

 

Other ways of making power...

Tuning is the best way. It's all in the head to be honest. You don't need anything from the bottom end except strength and reliability.

The top end needs full work to make it the best. Good porting, good intake manifold, cams that match your compression ratio etc...

P72's can be chipped and run hondata, uberdata, etc. But as a stock ecu, they can't be tuned of course. I would save a good chunk of money for tuning if I were in your place.

 

thanks all. I will do a "tuning" search. I am inferring brambrose means I have to by a hondata chip and put it into my ECU. When ready to tune I take it to someone who has the hondata interpreter program? The "tuner" then enters the best settings into the hondata chip inside my ECU. After that my P72 ECU is taken over by the hondata chip tables instead of the original tables? Is that close to what happens?
Thanks brambrose and snoopy for your notes.

 

yes. of course this is all done on the dyno.

there are options other than hondata depending on how much you want to spend and if you're a diy'er.

 

i recommend a heavy duty prybar for that jellyfish problem

 

i recommend a heavy duty prybar for that jellyfish problem

are ferlinghetti and keasey and richard brautigan still shouting in your bathroom pipes?
they comfort and haunt you. Good luck. Them guys were awful upset the last I saw them.
Didn't like me drawring to an inside straight. "dees caards ahhrr marked!!!!!!" - - - "deh ah mess!!!!"..... "deh ahhrr a choc -o -late mess!!!!"

 

I don't know what that means, but I recommend you either lay off the psychoactive substances or get some medication for that.