Manley Pistons Pron to Slapping?
#1
Manley Pistons **** to Slapping?
Just wondering if anyone else out there has installed some Manley pistons in their set-up? I did in my build and I am being told the noise I can't get rid of is piston slap. This sounds horrible especially for a new motor. I'm just wondering if anyone else is having this issue?
#7
Unfortunately I trusted the machine shop and did not double check so I am not sure what they set it at I do know that with the head off you can rock the pistons back and forth in the cylinder. When I ask them about it they said it was normal. Seemed excessive to me.
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#8
EvoM Guru
iTrader: (1)
I used 86mm pistons and bored the cylinders to 86mm.
you can't get an accurate piston to wall clearance with Mahles because they have the skirt coating on them which is not a consistant thickness.
If your machine shop installed them at 0.003" clearance, it will more like 0.004"-0.0045" which is a lot for 4032 alloy pistons.
Cheers, Mike
#9
Evolved Member
iTrader: (44)
I think it definitely has to do with your PTW clearance. However, pistons with more silicone coating are less prone to piston slap.
JEs use no coating, and although they are an extremely strong piston, this makes them slap happy.
Due to the fact that your pistons are coated, unless gapped loose, I don't know if I'd expect them to be as loud as you're describing.
JEs use no coating, and although they are an extremely strong piston, this makes them slap happy.
Due to the fact that your pistons are coated, unless gapped loose, I don't know if I'd expect them to be as loud as you're describing.
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