The other point that should be mentioned is that these liners should be honed
using a torque plate.
They get out of shape once they are clamped down in place.
FWIW I use JE pistons and set them at .004, usually with coated skirts as an
added insurance policy against scuffing.
Glen
-----Original Message-----
From: John Styduhar <johnstydo@gmail.com>
To: fubog1 <fubog1@aol.com>
Cc: mmoore <mmoore@wave1.net>; jhhasty <jhhasty@gdhs.com>; tr4racing
<tr4racing@googlemail.com>; fot <fot@autox.team.net>
Sent: Tue, Sep 11, 2012 2:42 pm
Subject: Re: [Fot] Never be beaten by equipment
My math shows that MadMarx is running .005" piston to wall clearance
(.13mm/25.4 mm/inch=.005. Wiseco's suggested clearance for their forged 87mm
slugs is .004, but others (BFE) have recommended .006, which is what my
machinist is honing to.
On Tue, Sep 11, 2012 at 1:16 PM, fubog1 <fubog1@aol.com> wrote:
I'll try this again, my reply had too much text.
The manufacturers will call out a recommended clearance, but that's all it
is.
The operating speed, temperatures, cooling systems etc all are variables.
Generally the harder it is run, the more clearance it needs.
Also pistons can scuff during warm-up, under certain conditions, so it's a
good thing to get it up to temp before flogging it hard.
Glen
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