Mark -
The BN1/BN2 have comparatively low compression to most 60's British cars,
even in Le Mans kit trim.
If a 4 cyl is running on all the time, it probably means that the carb
mixture and/or timing is off. Normal premium pump gas should be enough to
keep the car from running on. I put regular unleaded in my BN1 and it has
no problems. I can put moonshine in my A90 and she won't run on... 6.9:1
compression! Goodness gracious....
Best Regards,
Alan
'52 A90
'53 BN1
'64 BJ8
On Mon, Apr 27, 2009 at 10:31 AM, Mark Schneider <mandmschneider@comcast.net
> wrote:
> Bob,
>
> Most Brit cars seem to have a propensity to "run on" or diesel after
> killing the ignition. It is a symptom of hot spots in the compression
> cylinders. actually glowing pieces or metal of combustion products serving
> as unwanted spark plugs. The way I have dealt with it also fixed a couple
> of other problems at the same time. For about 20 years I have bought and
> keep on hand a gerry can of 110 octane leaded race gas. I mix one gallon
> of race gas with 6 gallons of regular pump gas. This gives me a calculated
> octane rating of about 97. Also, the race gas runs cooler than regular
> unleaded gas and cleans the combustion chambers so a point where no glowing
> bits remain. Therfore, no running on. If you have access to aviation gas it
> works the same way. Finally, another way that doesn't involve the expense
> of race gas or the safety issue of storing it is to simply leave the car in
> gear and as you switch off the ignition slowly let your foot off of the
> clutch. As the clutch engages the drag on the engine will stop it pretty
> much immediately.
>
> Marks 3
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