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Re: [T3] Polishing?


I'm not polishing the bus heads now it's all together and running very
smoothly (don't you hate saying that too loudly?!), Jim, but would the
roughness help reduce the chance of cracking, and if it passed heat through
the head, would that mean a cooler-running exhaust valve?  I don't know if
this is the thinking behind the finish, or just saving costs.

Dave.
UK VW Type 3&4 Club
http://www.hallvw.clara.net/
----- Original Message -----
From: Jim Adn\CÝøey@vwtype3.org>
To: <type3@vwtype3.org>
Sent: 10 June 1999 03:12
Subject: Re: [T3] Polishing?


> On 9 Jun 99, at 19:27, Dave Hall wrote:
>
> > That's interesting; the new Brazil TP1600 heads I put on the bus have a
> > nobbly (un-machined from the casting) surface in the combustion
chambers.
> > This would presumably pass more heat to the heads rather than the
exhaust
> > gases, so the exhaust valves run cooler.
>
> For every possible reason, you want to minimize the amount of heat
> that soaks out of the combustion gasses. For this reason it is a good
> idea to polish the tops of your pistons and the inside of the
> combustion chamber. For obvious reasons, this is seldom done in stock
> engines.
>
> Jim


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