I have this setup in my ls/vtec 91 HB Si with rev hard flat top valves the only thing that went wroung was my head gasket because of the 13:1 compression so now i have to take the head back off and put a cometic head gasket that i just bought on but i cant do myself.and i need an oil catch can.But if anyone here knows anyone who wants to buy my car i will sell it because i really dont feel like messing with it its just sitting here at my house there is less then 10,000 on the motor. asking to get like 3200 or a little less the interior is beautiful i got black leather civic seats.let me know my number is 727-368-1396 hit me up i live in seminole fl.cars just sittin here.

 

are you kidding me?

Run the CTR's in your setup, don't listen to these fools! The only thing that raises your powerband are your cams. Use CTR cams in your setup for the most midrange power, They are the BEST street cams.

 

since you obviously know more than me about everything, why dont you explain the relationship between engine compression and idle, and how rod/stroke ratios affect piston speeds and side wall loads.

 

if interested, I have a *MINT* New in Box set of JDM P30 B16 pistons with wrist pins and rings for sale $300, it will be perfect for your Ls/VTEC setup

 

i dont believe the rod stroke crap..i have lsvtec and i hit 8k more then once daily and no problems yet..with the p30 pistons..

 

Have you EVER tuned a honda? Have you ever built a 350+whp b-series? You may be going to school to be an engineer but, that don't really mean you know about engines. Compression will not effect idle and all the talk about r/s ratio IS COMPLETE BS! The LS/vtec will make power lower in the rpm range compared to a gsr with the same compresion and cam selection. This is because of piston speed. But you already knew that huh.

If you didn't already know, I was the brains behind the stock LST crx. that was owned by "Slo_si"



How true!

 

Ok so i can run ctr pistons but i need to run ctr cams also?

 

correct me if I wrong, but wont the be psiton slap with CTR psitons, their dome being soo much larger than a b16's?

 

u might have some valve clearance issues...so if im not mistaken u would retard the timing some so u dont have those issues..

 

I've built motors with CTR pistons and b16a pistons and they (ctr's) are not worth the trouble. Alot of detonation issues, timing had to be pulled all over the map to get them to run good on 93 octane and then it would still detonate occasionally. Another thing to note is that by law octane rating only has to be +or- 4 points. So that means you can pump "93" octane and still really only get 89 octane and that is considered qacceptable by whoever regulates those types of things. And when you consider octane costs money I highly doubt the manufacturers are on the plus side of the deviation.

The only time I'd suggest running over 12:1 on a daily driver is if you have a seperate race gas tune that you will run. Otherwise what is the point of running 13:1 compression if you are going to have to pull timing and detune it to run on 93 octane. You will make just as much power running 11.5:1 and decent tune.