i was thinking about raising my compression alittle bit and doing the cams and valves...now say i get jdm type r pistons will this bump my compression up to 11:1? and then i get a mugen head gasket to bump the compression up a litlle more...would this be a good setup and what kinda power will this yield?

 

no sense taking all the time to change out pistons just to JDm ITR. If you want OEm honda go with the CTR and keep an OEM three layer gasker- right around 12:0.1 you will be.

Or better yet go with an aftermarket forged piston that have deeper valve reliefs cut in them and go for 12:5.1. THat way you can play with some high lift cams and not have to worry about piston-valve interference when you play with the cams-

Or option number 3 is to leave your block how it is and use flat faced valves, mill the head .020 and use a 2 ply gasket like mugen or center removed OEm gasket. That should yield 11:3-11:4.1 for ya.That is perfectly suitable for some Skunk2 STG2 cams. This route make sure you clay though- you might only have a coupel of degress of adjustability on your cam gears. IT is all about choices. Good luck.

 

now if i get ctr pistons and keep the stock head gasket what should i do about the valve train and how much power will this produce? this seems like the better way because i dont have a large budgit to work with...

 

I would go with the CTR. Cheap and good power gains. Some people even go with a thinner head gasket, but that depends how much you mill off your head. Then some Todas or Juns or some other cam that loves compression. Otherwise what asubennett said as his 3rd option sounds like a good idea as well. Whats wrong Brian, car not fast enough?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by asubennett &raquo;</TD></TR><TR><TD CLASS="quote">no sense taking all the time to change out pistons just to JDm ITR. If you want OEm honda go with the CTR and keep an OEM three layer gasker- right around 12:0.1 you will be.

Or better yet go with an aftermarket forged piston that have deeper valve reliefs cut in them and go for 12:5.1. THat way you can play with some high lift cams and not have to worry about piston-valve interference when you play with the cams-

Or option number 3 is to leave your block how it is and use flat faced valves, mill the head .020 and use a 2 ply gasket like mugen or center removed OEm gasket. That should yield 11:3-11:4.1 for ya.That is perfectly suitable for some Skunk2 STG2 cams. This route make sure you clay though- you might only have a coupel of degress of adjustability on your cam gears. IT is all about choices. Good luck. </TD></TR></TABLE>
I just want to make it clear that having deeper valve notches in a piston will not raise compression.

 

where in the good lords name did I imply that Mexecutioner?

Compresion is realized by how tight the tolerances are between the piston top and combustion chamber. So, naturally a high compresion piston is goign to need a deeper valve relief cut in it to accomodate a high lift cam.

But never did I say that valve relife has any effect on compresion ration at all.

 

i was reading on this topic and would like to know what would be the compression of the P30 pistons and the CTR pistons in a B18c5 block? I am thinking of raising the compression on my C5 block as well but want to do it safely.

Also in using the CTR piston setup w/ Flat surface/high comp. valves, would there be any piston-to-valve clearance issues? same w/ the P30 pistons.


Modified by Vteknician at 12:23 AM 3/24/2004