Alriiighty... I've ordered my CP pistons at a 12:1 compression BUT I wanna get at least 300 whp or over (this is not a daily driver its a weekend/track car)
will it be easy enough to do this with 12:1 compression on pump gas? or should I call and change the order to some 12:5:1 pistons?

just some FYI on my build to give you an idea... H22A/H2B Darton sleeves, Carrillo Pro A rods, 70mm TB ported RRC K2H induction, going to be going with Skunk2 Pro2 cams and a fully built port n polished head, 3" exhaust, probably going with Injector Dynamics injectors... I've just been so on the fence with going with 12:1 or 12:5:1... if it's gonna be possible to get some good power with 12:1 I would rather do that but I don't wanna do all this and have that hold me back from breaking 300, I want to stay under 400HP though (which I know wont be a problem haha)

 

From the looks of the displacement and nice headwork and cams the 12:5's would really shine

 

If pump gas, I'd stick with 12:1.

FYI, Pro2's and pump gas are not going to get you to 300whp, I can tell you that.

 

^ Logic behind it? My 12:4 motor loves 93 pump

 

But its probly detuned like a ****

 

All depends on the tuner man...

 

Yea and if he did it right it should be detuned like a **** to run on pump gas. People shouldn't even consider hi compression setups if they aren't able to use the proper gas

 

Or should I say... fuel

 

your hp goals for the h are up there. All i can say is your gonna need some major head work. The only 4cyl honda motors i have ever seen make over 300whp with 12.1 comp or less are k series motors. Now if you said your compression was 15.1, then your 300whp would be more realistic. You looking at around 250-255hp with the stuff u listed in my opinion

 

If this is a track only car, why are you running pump gas? IMO you Should be running higher than 12.5 (as mentioned above) with a little taste of race gas.

Off topic, why is it that so many people have no idea how to use the ratio symbol? It's 12.5:1 not 12:5:1. or 12:5. 12:5 = 2.4:1 I'm sure that's not the compression ratio that you are looking for.

 

Yea spoke to him (domi-man) thru PMs he was unaware his car may have been retarded to handle pump gas. He is going to speak to his tuner about running ethanol.

As for the OP'r he's gonna end up with the same problem if tuned on pump at that high of a CR

 

Well he said fully built port polish head, at this point I would focus on a quality intake and headers. Also I agree if this is a track only car why would you stay with 12.0:1 and pump? with your goals I would really look into higher comp.

 

Good stuff to know, well I guess my hp goal went a little lower :-P maybe i'll put in a little shot of nitrous or something in the future, I want to drive the car on the street on weekends and also drive it to and from the track... so I guess I'll have GOALS at about 260 with a 12:1 compression, I just don't want to turbo, everybody turbos. and yea the head work will be really good and I'll deff be figuring out the best intake possible... will the car's interior completely stripped and a 3" side exit exhaust it shouldn't be a slouch!

should I go with 750 or 1000cc injectors?

 

U don't need injectors that big

 

yes but more so, octane, compression, piston top shape, combustion chamber shape, plug temp, load on the motor and a few others im forgetting now, then the tuner.

 

But people run CRs up to 13:1 on 91-93 octane.....

 

What do the fuel and ignition maps look like? Probably not making the best use of that compression running on pump gas.

I think what people are trying to say here is that you have to retard the timing and up the fuel so much to reduce the potential for knock. Having to do this takes away any of the benefits of having a 13:1 compression ratio.

 

all in all what they are saying is its pointless to run compression that high on pump gas because your no benefiting from it you will make the same power as if you just went with less compression and more timing

 

You my friend are at the crossroads. Nut up and buy race gas and run higher compression making more power OR settle, use pump gas on lower compression and make less power. On pump gas with what you have listed I feel like anything over 250 is a stretch... you gotta pay to play and go fast.

 

Meh, why not? a 1000cc Injector Dynamics injector would be perfectly capable of running a stock motor, and its not like they really cost all that much more. Sure its more injector than he needs, but he might as well go with the bigger one, that way he'd be able to handle other fuels like E85 or Ethanol if he chooses to move away from pump gas. Might as well have some room to grow right??

 

I totally agree, best to buy an injector that has room to grow the first time around, you never know what you may decide to do next year.

 

Like what, get rid of the high compression and go boost! That I could see buying 1000cc injectors for. He would need to do a whole lot for this engine to ever require 1000cc injectors N/A. IMO The ID725 (725cc) would be more than enough if you desire the Injector Dynamic brand and reliability.

 

Awesome guys thanks for the great feedback :-) I just dont want to turbo and basically want to make as much power on 93 octane as I can all motor and a stripped car. looks like Im gonna try for 260hp... I wont be disappointed if I fall just shy but... who cares it'll handle like a king and be quick as **** for an all motor pump gas Honda! Yea maybe I'll just grab up those 725cc injectors... I want Injector Dynamics fo shoo.. should be more then enough on an all motor engine :-) I'll deff never switch to turbo after all the time and money put into all motor... I might buy a 2JZ Supra or something after Im done and just go nuts with turbo **** on that... but for now this is my all motor pump gas honda project :-)

 

I guess I didn't lay the sarcasm on thick enough.

 

Yeah sometimes it's really hard to read sarcasm.....