If you are breakiing ring lands off of the pistons, then you are
experiencing detonation. Seems like the real answer would be to retard the
ignition timing &/or richen the mixture. Running the engine on a dyno and
finding the proper "tune" for the combination you are using would gain you
power and reliability.
Greg Solow
----- Original Message -----
From: "Bob Bownes -Seiri" <bownes@seiri.com>
To: "Mike Munson" <fasttrs@yahoo.com>
Cc: <fot@autox.team.net>
Sent: Wednesday, July 20, 2011 1:20 PM
Subject: Re: [Fot] CR
>I went to 12:1 in the tr6 and can't keep lands in between rings, so I'm
> falling back to around 10:1.
>
> Kas ran @ 12:1 with much better success. But my engines need to last
> longer.
> :)
>
>
>
> On Jul 20, 2011, at 15:09, Mike Munson <fasttrs@yahoo.com> wrote:
>
>> I had one TR6 engine with .040 over cast pistons that I ran at 14:1. The
> only
>> time I had problems was when someone put too lean a main jet in and I
>> burned
> a
>> whole in number 5. I cut down the mosquito population that day at Road
>> Atlanta. I wear glasses now!
>>
>> Mike
>>
>> From: marty sukey <trmarty@hotmail.com>
>> To: FOT <fot@autox.team.net>
>> Sent: Wednesday, July 20, 2011 10:14 AM
>> Subject:
>> [Fot] CR
>>
>> What is the collective wisdom of the FOT masses as to how high of a
>> CR can be
>> run on cast pistons? This would be Spitfire FWIW. I am at 10.8:1,
>> intentionally kept it low because of the cast pistons. I have had a
>> discussion with an engine builder telling me I can go much higher. I am
>> contemplating bumping up to 12:1. Before I blow something up I thought I
>> would toss it out for discussion. What say ye?
>>
>> Thanks,
>> Marty (one race in and
>> I already want to go faster) :)
>> _______________________________________________
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>>
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