Normally speaking the layer of coke on top of a piston reduces the heat,
which is often why a rebuilt engine will have piston problems from
overheating whilst an old engine will tolerate it.
John Kipping
----- Original Message -----
From: "Bill Babcock" <BillB@bnj.com>
To: "matt matthews" <mattspit@worldnet.att.net>; <MJSUKEY@cs.com>;
<6pack@autox.team.net>; <fot@autox.team.net>; <shop-talk@autox.team.net>;
<Triumphs@autox.team.net>
Sent: Wednesday, April 28, 2004 9:13 AM
Subject: RE: Engine coatings
> I would guess your piston tops are coated to shed heat, not retain it.
>
> I experimented with ceramic coatings on pistons in the late 70's (on a
50cc
> GP bike) Worked really well.
>
> -----Original Message-----
> From: owner-fot@autox.team.net [mailto:owner-fot@autox.team.net] On Behalf
> Of matt matthews
> Sent: Tuesday, April 27, 2004 1:08 PM
> To: MJSUKEY@cs.com; 6pack@autox.team.net; fot@autox.team.net;
> shop-talk@autox.team.net; Triumphs@autox.team.net
> Subject: Re: Engine coatings
>
> I use Polydyne coatings in Houston.
> I use two different coatings, layered, on the bearings. I was told by the
> original engine builder the he could not get the 1500 Spit to live long
> without them. Normal rev limit is about 7000 with touches to 7500. 8900
> wiped three of the four rod bearings. Also, if the bearings were aluminum
> they would only be good for one weekend. Clearances are critical.
> The exhaust manifold is coated inside and out to retain heat and resist
> rust.
> The exhaust passages are also coated.
> The piston tops and cylinder head combustion chamber is coated to retain
> heat. The sides are coated to reduce friction.
> The car runs cool, compared to our other car which was not coated, but
will
> be.
>
>
> > From: MJSUKEY@cs.com
> > Reply-To: MJSUKEY@cs.com
> > Date: Tue, 27 Apr 2004 13:06:51 -0400
> > To: 6pack@autox.team.net, fot@autox.team.net,
> > shop-talk@autox.team.net, Triumphs@autox.team.net
> > Subject: Engine coatings
> >
> > There are all kinds of coatings being offered by different plating
> > companies out there to be used on internal engine surfaces, different
> > ones for blocks, cams, pistons, ..... all claiming to decrease
> > friction, make your parts last longer, make your car go a million miles
> per hour, well you get the picture.
> > On paper they look kind of interesting. Has anybody had any first hand
> > experience with any of these coatings? Opinions good bad or indifferent?
> >
> > Thanks,
> > Marty Sukey
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