Stroker Problems evo9
#1
Stroker Problems evo9
I just wanted to share the problems that I had using cp pistons 9.0 to 1 compression and 156 mm long rods in a stock 229mm deck evo 9 with 94 mm stroke, compresion distance of less than 26mm made the rings to close to the top valve relief, the first time I boosted 30 psi with a FP 3586 turbo the 4 pistons broke from that part , really disapointed I thought piston desingers didnt do pistons when they have a risk of breaking. Im switching to stock length rods and JE pistons. Hope somebody reads this and doesnt do the same mistake.
will post pics later
will post pics later
#5
On a stock 63 block a 94mm stroke should use a 153mm rod and a stroker piston with the pin moved up 6mm. The 156mm rods can only be used with stock stroke with a stroker style piston.
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88mm Crank
156mm Rod
Stroker Style Piston with the pin moved up 6mm
Compression will drop by about 1point if off the shelf pistons meant for 100mm crank is used...
but 94mm Stroke and 156mm Rod thats sounds like the smoking gun to me too.
.
#7
Yep sounds like he got the geometry wrong...
88mm Crank
156mm Rod
Stroker Style Piston with the pin moved up 6mm
Compression will drop by about 1point if off the shelf pistons meant for 100mm crank is used...
but 94mm Stroke and 156mm Rod thats sounds like the smoking gun to me too.
.
88mm Crank
156mm Rod
Stroker Style Piston with the pin moved up 6mm
Compression will drop by about 1point if off the shelf pistons meant for 100mm crank is used...
but 94mm Stroke and 156mm Rod thats sounds like the smoking gun to me too.
.
Everything has been running fine
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is the head toast also? What method were you using to check for detonation?
here's a pic of a Wiseco hd 9:1 94mm stroke 150mm rod for comparison, i dont know much about piston design but the top land looks to be alot bigger than your cp's.
here's a pic of a Wiseco hd 9:1 94mm stroke 150mm rod for comparison, i dont know much about piston design but the top land looks to be alot bigger than your cp's.
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This is just my two cents im no expert but OP was useing 156mm rods which is why there shorter. also it looks like detonation was the cause....also how does the head look were the valves bent or hit at all?