Evo 8 2L Build Piston Ring End Gaps & PTW
Sep 27, 2018, 04:28 PM
#1
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Evo 8 2L Build Piston Ring End Gaps & PTW
Hi guys,
I'm building my 4G63 engine in my Evo 8 and I am aiming for a 600-700hp capable engine.
I'll be sticking to the standard stroke and standard length conrods.
I have ordered Wiseco 2L 9:1 CR 85.5mm pistons (K626M855AP).
Wiseco recommends:
Top ring = 0.0168" (Bore x 0.0050)
Bottom Ring = 0.0185" (Bore x 0.0055)
PTW = 0.0035"
From what I've read online. Everyone seems to be running slightly looser clearances. Eg Top ring = 0.02", Bottom ring = 0.022, PTW = 0.004".
Should I follow the manufacturers recommendation or run slightly looser clearances for the power I'm chasing?
Thanks!
I'm building my 4G63 engine in my Evo 8 and I am aiming for a 600-700hp capable engine.
I'll be sticking to the standard stroke and standard length conrods.
I have ordered Wiseco 2L 9:1 CR 85.5mm pistons (K626M855AP).
Wiseco recommends:
Top ring = 0.0168" (Bore x 0.0050)
Bottom Ring = 0.0185" (Bore x 0.0055)
PTW = 0.0035"
From what I've read online. Everyone seems to be running slightly looser clearances. Eg Top ring = 0.02", Bottom ring = 0.022, PTW = 0.004".
Should I follow the manufacturers recommendation or run slightly looser clearances for the power I'm chasing?
Thanks!
Sep 28, 2018, 09:21 AM
#2
How is you block prepared?
What fuel will you be running to make that power? E85?
Also, do you know the thicknesses of your rings?
Personally, I'd stick with manufacturer's recommendation because 600-700 hp isn't that extreme to go beyond their recommendations. Just go to their loosest recommendations if you think you'll be racing around in that power range.
What fuel will you be running to make that power? E85?
Also, do you know the thicknesses of your rings?
Personally, I'd stick with manufacturer's recommendation because 600-700 hp isn't that extreme to go beyond their recommendations. Just go to their loosest recommendations if you think you'll be racing around in that power range.
):
