i would like to get the

CP Pistons and

Cosworth Head Gasket for my X

i will have a stock location fp red or blouch dominator 2 turbo with meth set up.
i have 3 questions for you guys.

1/ on the piston, should i go for the 86, 86.5 or 87mm set up? what is the difference and which one suit my need?

2/ on the gasket, should i go for 1.1mm or 1.3mm to lower my compression ratio?

3/ if i change the gasket and head stud now and decide to upgrade my cams and valve springs later, do i have to change the gasket and head stud later or i can reuse them?

thanks guys

kl

 

Here's a short and quick reply for you. I haven't rebuilt any 4g's or 4b's but this is just a recomendation.
1)Stick with the 86mm. Unless you've already torn into your engine and found that you need to bore your cylinders due to wear, you won't need anything bigger. Normally one would wait to measure their cyl. walls before choosing thier piston sizes.

2) If you're going to be lowering your compression, do it by either making adjustments to the head, or by choosing a piston better suited to what you hope to have your compression set at. Sure, you can use a head gasket to change your compression ratio, but it won't be that dramatic, but you could mess with what's known as a squish area. It's a small low clearance area that makes are squish and swirl in the cylinder when you hit TDC that helps your AF mixture burn better. I can't say too many people have messed with changing this with the new 4b yet, but why be the first to try that? It could cause some unwanted pre-detonation, or it might not change anything at all!

3) If you buy the propper tools to change out your cams and valve springs without removing your head from your block, then no! There is a tool that is made to be able to pressurize a cylinder that will keep your valves from falling into it when you go to remove your spring. All you will need for that is a valve cover gasket! much cheaper than having to get another new head gasket and having to get your head shaved again!

Good luck to you. And I'm sure some with alot more experience will chime in here soon enough.

 

so gasket and head stud are for 1 time use only and after you remove it to change out something, a new set is needed?

if this is the case, should i change the cams and springs the same time i am doing the bottom end.

thanks, this is my first time considering building my bottom end.

kl

 

Based upon your questions [and do not take this negatively], I would highly recommend you go to a shop that has rebuilt engines and has had experience in same using the 4B11 or at least the 4G63 engine to develop first, a plan and then a parts list.

Later, Ken

 

i will do that. i just want to get my basic knowledge about engine building before going to the shop and ordering my parts. thank you again for your advice.

kl