Re: IML: gas types

[randalpark@xxxxxxx]

I have successfully retarded the timing on the otherwise properly tuned 
413 so that it would run on regular unleaded gas smoothly, and without 
any spark knocking. This was done by "road timing" the car rather than 
using the timing marks to set. The power is reduced slightly, but I 
don't drive them like race cars anymore anyway. The real problem is the 
fact that all gas now is unleaded. This eventually causes the valve 
seats to wear away and valve recession (into the cylinder head). Some 
of this can be avoided by not driving the car at high speed for long 
periods. In other words, no long trips on the freeway at 75 mph, like 
they were originally designed for and are at their best.

The heads can be rebuilt to handle modern fuel, and when the car 
eventually needs a valve job, that is what should be done anyway. I 
don't use my Imperials enough anymore to make it worth while, although 
when I do have work done I get the hardened valves and valve seats 
installed, mostly for the benefit of the next care taker after me.

Paul W.


-----Original Message-----
From: Patricia Pruitt <pruittghl@xxxxxxx>
To: mailing-list@xxxxxxxxxxxxxxxx
Sent: Wed, 23 May 2007 11:19 am
Subject: IML: gas types




We are in the throws of working on my ’62 Southhampton Crown.  In the 
‘old’ days when we had 50s-60s high compression engines (’56 Plymouth 
Fury) that were supposed to use on high octane fuel, we always used 
‘regular’. We did adjust the timing for that.

 NOW, my query is; can we still use this method or must we buy 
‘premium’?  I am not familiar with the changes in the composition of 
today’s fuels.  Does anyone out there have the facts on this? We do not 
use ethanol and are not likely to do so in the future.  Would like to 
hear from those in the know.

 

Patricia  Pruitt

Bozeman, Montana 59718

pruittghl@xxxxxxx   

 



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