<VV> Fw: [fastvair] Re: A question about compression ratios and fuel octane rating

[BBRT]

----- Original Message ----- 
From: "cooterr2003" <cooterr2003 at yahoo.com>
To: <fastvair at yahoogroups.com>
Sent: Tuesday, January 20, 2009 3:16 PM
Subject: [fastvair] Re: A question about compression ratios and fuel octane 
rating


> We will be having a tech session on engine coatings at the Performance
> Workshop.
>
> Tom Miller
>
>
> --- In fastvair at yahoogroups.com, Bryan Blackwell <bryan at ...> wrote:
>>
>> Hi Bob,
>>
>> The one user post I've read on the subject suggests the opposite -
>> the cooler surfaces reduce detonation.  As I understand it, by the
>> time the temp rises in the combustion chamber the mixture is burning.
>>
>> But, this is one report.  I'd be interested in hearing any other
>> first hand reports, especially from competition users.
>>
>> In any case, I'd hesitate to run higher than 10:1 on pump gas (93
>> octane), even with improved squish, given no electronic controls.
>>
>> --Bryan
>>
>> On Jan 20, 2009, at 2:23 PM, <dryenko at ...> wrote:
>>
>> > Actually, coating pistons and combustion chambers would tend to
>> > increase the tendency to detonate, because of the increased "Q" or
>> > heat contained there-in..
>> > The big  deal , imho, is the decrease in piston to deck clearance,
>> > which  will make a higher than normal compression workable..
>> > Bob C
>>
>
>
>
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