YB head thickness question for someone that knows there stuff!
#1
I'm Finding My Feet Here Now
Thread Starter
YB head thickness question for someone that knows there stuff!
got a head here 2wd cosworth YB which measures 137.5mm would you say this has had its day? or would it be ok to use with maybe a WRC gasket if so what mm gasket?
#2
PassionFord Regular
I going to use one which is 137,2mm. Use pistons with valve pockets and measure everything to calculate c/r. Wrc cars and rallycross cars run heads like this to raise c/r and run between 350 and almost 600bhp for rallycross so that will do for me.
The following users liked this post:
carterhall14@hotmail.com (24-04-2016)
#3
I'm Finding My Feet Here Now
Thread Starter
thanks for the reply buddy yeah i was just a little concerned that my valves would clash with my pistons. so you rekon get my pistons pocketed?
The following users liked this post:
carterhall14@hotmail.com (24-04-2016)
#6
PassionFord Regular
Dont be afraid to raise c/r to 8.5 or even 9/1, mapping is the most important bit to keep it in one piece.
The following users liked this post:
carterhall14@hotmail.com (29-04-2016)
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#9
10K+ Poster!!
If the max is 138.6 and you are under then surely it will be at the risk of valve seat integrity, I guess that then comes down to spec of engine, boost, usage, revs etc. I bet the factory have a large tolerance of safety.
#10
Steve
#12
I'm Finding My Feet Here Now
Thread Starter
right this is my last chance as i will be assembling the engine tomorrow so just to build my confidence. I should get no valve to piston contact providing my pistons are pocketed and i use a victor reinz group A gasket. nervous thats all im asking again for lol. Thanks.
#13
PassionFord Post Troll
When its all built up mate I'd avoid bouncing off the rev limiter as when the heads are that low there's not a lot that holds the valve seat in place which is why you see so many drop valves into cylinders.
The following users liked this post:
carterhall14@hotmail.com (30-05-2016)
#14
I'm Finding My Feet Here Now
Thread Starter
thanks for the reply mate. Yeah i will be lets say taking it easy as that will be in my head at all times. i basically want reliability more than anything now so i can just enjoy the thing for once lol.
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