alright i got a b18a block with b16b pistons arp rod bolts b17 head stock valve train, so i bought a set of skunk 2 stage 3 camshafts also got the supertech valvetrain, so i was wondering if the cams will have so much lift that it could hit the pistons. i heard that people ran ctr pistons and skunk 2 stage 2 cams before and said the engine was very strong and had power.

 

You need to really clay this engine when doing this either way. I would recommend the stage 2 tuner 2 for a street car like this. But CLAY, CLAY, CLAY, to check for P2V clearance. that's over 13.0:1 compression with that combination easily

 

I'm rather interested in this information as well. I guess I could pick up a set of CTR's and try this.

 

man the problem is the engine is in my car right now and its my daliy driver how do you clay it?

 

im not positive but i think you put clay on top of the pistons and turn the motor over by hand and then see if the pistons hit the valves

 

so how do i get the clay into the motor

 

there is a guy on youtube with almost the same setup like me with stage 3 cams and ctr pistons and the motor runs fine in the video.

http://www.youtube.com/watch?v=ude-Q8L0K5Q

 

...yeah but for how long..?

 

Hey, a friend have the same setup (CTR piston , b16a head shaved .80 , Cometic 51mm , Crower Full Race cams ) ... daily driver ... i dont know how agressive is Skunk2 stg3 ... camshafts is degree 0 int. 0 exh. and he dont have any problem ... the Time in the motor is very important...

 

Ok..
Obviously people need to do more searching and less talking.


With all things being equal.. your current CR as your car sits would be =
11.9

The s2s3 cams are a big cam , you'll need to clay your motor to make sure you dont p2v.. v2v really isn't a problem on tuner series cams.

PCT/CTR pistons are crap btw.. there's a ton of reasons but i'll list only a few..
They are **** ton heavy
They distort the combustion process because of uneven combustion
they are only meant to go into b16's.

They usually result in insanely high compression on most setups.. a b17 head isn't all that bad, had you had a GSR head lol you'd be way up there... and it sounds as if your still very uneducated on the matter, so what you plan to due tuning wise i dont know..

 

More than just the technical side of the amount of uneven combustion or the circumstantial issue of more mass, one must look at the practicality of using such a higher compression for daily use. We understand that you may not be mechanically inclined to assemble your engine yourself, but that doesn't mean that you shouldn't research the issues regarding such a unique build without measuring. "Claying" the engine involves a machine shop that would assemble the engine to make sure that no possibility of contact between the pistons and the valves exists. Regardless of the math, this is a risky build, especially if you're using this as your only mode of transportation. It may be time to look for some additional options.

 

Any lsv with ctr pistons will be above 13:1 compression.

 

Not with a b17 head..at least thats not what c-speedracing.com said.

i believe the b17 is the round chambers, not square like the gsr head.

 

I agree totally, i do run a INSANE amount of CR on my daily driver, however, i built and tuned it, and i know its limits..

throwing this together without proper research could yield not so good results.

 

Zeal Gives 13.93:1

Even using the numbers Omni gave for specs on CTR pistons it comes out to 13:3:1 I believe it was.

A b17/b16/type r head are the same casting.

Everyone knows c speeds **** is wrong.

 

this is going to b ur daily driver? I hope u got a thicker head gasket to minimize sum compression to run pump gas or u gona b pinging like a mother fuKr..as for cams I would go with either a skunk2 pro 1 or 2..I have the ctr pistons on my gsr with pro 1's crower valvetrain supertech flat valves nd a .40 commetic head gasket to run 91..motor runs strong nd feels healthy.still breakn it in for the tune