Those numbers are perfect. You have excellent compression. You do not drive fast enough. nana.gif

 

yes I am planning to go turbo soon, I got a friend that works on a shop and I'll have my head, IM, and TB port & polish, I will also have the crank knife edge, for a cheaper price than usual, I am planning to get titanium valvetrain, light weight pullies all around, light weight flywheel, and power steering, ac delete. I can't wait to start this project, it will start soon smile.gif

 

i tested the engine a couple weeks ago and on all 4 cylinders it had 200 psi on a cold engine. the engine have 106k miles and about 6k miles on boost so far. smile.gif

 

Tony, with all the work you're putting into the head I'm assuming you're going to be running more than 10-12 pounds of boost (sounds like 18-20+PSI).... In which case, you had BETTER get low compression pistons, ARP head bolts and connecting rob bolts. I'd consider overboring to 82.5mm, to use a set of 82.5mm wiseco pistons.

165 PSI is not really 'good' to begin with, considering most people here have 195 and up, N/A, and then you're going to boost and put even more pressure on those piston rings and destroy the engine even faster.

I'm just saying it sounds like you're going balls out on this build, you may as well do it right the first time, because you'll regret not doing it once you shoot a piston through the block or something happens to damage your expensive head work.

 

Nah, no worries, he'll just have positive crankcase pressure out the wazoo is all. Maybe and crack the ring lands on a few pistons. No problem really.

 

well of course the head will be capable of 18-20 psi of boost but I want the block on 10 psi daily driven, and if possible 15 psi on race day

 

...in which case titanium valvetrain is a waste of money. 3 angle valve job/porting/regrind seats, yeah thats worth it.

Hell you could run 15psi without forged pistons on stock comp with a spot on tune...if you had better compression of course

Spend your money wisely, unless you have an unlimited amount smile.gif

 

What's the light weight powersteering going to do for you?

LOL

Dude, why are you throwing so much money at fixing a problem that isn't there? Titanium stuff just to say you have it? The stock head and all the parts in it will hold more than 15 PSI. Hell, how much PSI was Yamaha just throwing at his car?

 

who said their was a problem redz, I wan my beta to be rev happy with the stand alone and a good tune I want at least 7500 rpm, my goal is 8k rpm limit.

 

Exactly, if there's no problem and the stock parts can handle it, why the hell are you developing new one off parts for your car that are going to be expensive as hell?

The stock stuff will handle up to 10,000 RPM's, so again...

If it is to be the only person in the world with expensive ass parts that don't matter, then... unkay.

Anyone else care to voice their opinion?