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
>
>
>
> -----Original Message-----
> From: Mike Moore <mmoore@wave1.net>
> To: 'fubog1' <fubog1@aol.com>; jhhasty <jhhasty@gdhs.com>; tr4racing
> <tr4racing@googlemail.com>; fot <fot@autox.team.net>
> Sent: Tue, Sep 11, 2012 1:06 pm
> Subject: RE: [Fot] Never be beaten by equipment
>
>
> As an inexperienced newcomer with my TR4 next year, (I never heard of
> piston
> skirts scuffing the cylinder liners, at least not in my stock TR4), it
> would
> seem to me that we should have the Kastner Cup as the first race of season,
> there may not be many engines running by end of season!
>
> I knew vintage racing would have its share of breakdowns, but you guys are
> scaring the hell out of me!
>
>
> Mike Moore
>
> 62 TR4
>
>
>
> -----Original Message-----
> From: fot-bounces@autox.team.net [mailto:fot-bounces@autox.team.net] On
> Behalf Of fubog1
> Sent: Tuesday, September 11, 2012 11:50 AM
> To: jhhasty@gdhs.com; tr4racing@googlemail.com; fot@autox.team.net
> Subject: Re: [Fot] Never be beaten by equipment
>
> 2.5 is not enough.
> As Chris has said, the wet-liner engines need more.
> I set them to at least 3 1/2 thou.
> Glen
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>
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