this may be too broad, but generally speaking, is there a ballpark figure where tuning on pump gas becomes impractical?
depends on the cam, head/combustion chamber work, etc hopefully ur planning on using 93 oct… people have run 13+:1 on pump…its all in the tuning.
I’d say u can run 12:1 on pump, 13:1 gets pretty tricky.
yeah i was planning on running 93 for sure
We (I think you were there that day) did a civic a couple years back on pump with a 13.?:1 setup. It was nice to have the dyno dynamics rig to pick up on any detonation.
have you ever had ctr pistons??? have you ever had a motor with ctr pistons and switch to p30’s??? well i have, i gained power everywhere with the p30 pistons (and both were fresh builds) do some reading up i know what i am talking about here…
compression is king if you have the octane to take advantage of it, and also the tops of the pct pistons mess up the flame front, i could go on and on about it from FIRST HAND EXPERIENCE
What head were you using with that piston? Wrong chamber with the wrong piston is what fucks up the burn.
b16 head, gsr head would not have helped any, i have done alot of research into this
what alot of people dont realize is that especially with an ls vtec the compression with pct pistons is 13:1 ++, which is possible on pump gas with a piston thats designed for the setup (not just a mountain on top for higher compression)
what cams alpha earl? as you see in my previous post, i told the guy over 13:1 is tricky. There’s no debating that.
Perhaps CTR pistons on an LS crank might be too much for pump, but to just say the piston is crap is still wrong lol. Just gotta be used in the right applications. You observed the flame front being “messed up” firsthand?
no thats from people who have done alot of research into na motors and know what they are talking about
i was using skunk2 stage 2 cams
and they are good for the b16b due to having different wrist pin height they will raise compression even more on any other rod than the b16b’s rods
if you want i can point you towards the reading i have done or to a couple informed people (rocket, donf etc) that will agree with me that pct pistons in any other motor than a b16b are a waste of time
being that a b16b is nothing more than a de-stroked b18c then how can then flame front be ruined? It is the same chamber.
Adjust timing properly to comp for increased piston speeds and dwell differences and you will be fine.
Rocket knows what he is talking about, but right now you sound like a parrot.
why use p30pistons over itr? arent p30 10.6? itr are 11.5
happy medium over 12.5 ctr
play with that some and you will see, different deck heights, etc all come into play with compression, the only advantage for itr pistons is the skirt coatings
if this really works, then it appears as if it may be very helpful to finding the best option for me :tup:
the only thing it is not accurate about is the pct pistons because it does not take into account the wrist pin height
stay around 11.5:1 for a nice daily driver on 93 octane
Read lots of interesting/wrong things in this thread but this is probably my favorite.
Toda Party is right do the K swap. You also don’t need to buy the whole swap together, unless you’re really good at saving money because it’s going to run you between $4.5-$6k.
Since you were planning on doing this crazy B-series build, why not grab a K24 bottom end and go from there, this way you give yourself something to play around with over a period of time so you keep interest in the project. I guarantee if you save up $6k you will for sure do something else to your car or buy a whole different car, probably rightfully so.
Also you may as well go for as much displacement as possible if you’re going to do an NA build. K24 bottom ends and K20 heads (or even just a full k24a2 motor) can be had for relatively cheap these days. I’d recommend staying away from Honda-Tech, for every person who knows what they’re doing you have 1000 idiots saying random things.
thanks for the input, but i actually just got rid of my integra and got a 91 accord 4 door and an h22a1 that im planning to do a swap with 
Oh go me. Didn’t realize this was a month old thread. Well that should be a little bit better.
yeah i figured, especially because its just going to be a daily and i don’t want anything too extreme. but it think it will be more fun than the integra
On oem pistons. That are .25,.5 and 1 over, you will lose compression slightly. Pretty sure it’s like .00010 or something that you overbore, regardless of the miniscule amount, you’re still losing compression
I wasn’t referring to all pistons :spank:
Weird how it’s just OEM pistons… I would think with any piston the more you put into the same sized combustion chamber it’s going to increase compression. Should work the same way as when you weld a combustion chamber and make it smaller and keep bore size the same.