| Re: [GMCnet] what a difference a spring makes [message #325391 is a reply to message #325390] |
Tue, 24 October 2017 15:19   |
James Hupy
Messages: 6806
Registered: May 2010
Karma:
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Senior Member |
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Lean mixtures make more heat. Gasoline rich mixtures carry off a bunch of
it. Your choice. Probably safest to keep that ratio on the fat side of 15:0
to 1.
Jim Hupy
Salem, Or
78 GMC ROYALE 403
On Oct 24, 2017 1:13 PM, "Carl Stouffer" wrote:
> Keith V wrote on Tue, 24 October 2017 11:37
>> Last night I was reading about carb tuning and one thing I kept seeing
> is people saying you cannot read spark plugs anymore with reformulated gas
>> as they are always white.
>>
>> So I guess I'd be careful about that.
>>
>>
>> I was also looking at power vs economy curves for AFR and it looks like
> I might still be a bit lean. I just know that the next fatter jets will
>> put my cruise AFR into the 13:1 range and I'd rather stay out of there
> during cruise.
>>
>> I wonder how accurate Jets are, should I try another set of 69's?
>
>
> It IS kind of a PITA to swap out jets, but it wouldn't hurt to try the
> next size up if you're up for it.
>
> I went to 72s on the recommendations I got from here and even with those,
> I ended up with a cracked exhaust manifold and, eventually, a burned exhaust
> valve. Now whether those were related to my AF mixture is a matter of
> conjecture, but maybe.
> --
> Carl Stouffer
> '75 ex Palm Beach
> Tucson, AZ.
> Chuck Aulgur Reaction Arm Disc Brakes, Quadrabags, 3.70 LSD final drive,
> Lenzi knuckles/hubs, Dodge Truck 16" X 8" front wheels, Rear American
> Eagles,
> Solar battery charging. GMCSJ and GMCMI member
>
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