| Re: [GMCnet] what a difference a spring makes [message #325388 is a reply to message #325386] |
Tue, 24 October 2017 13:37   |
Keith V
Messages: 2337
Registered: March 2008
Location: Mounds View,MN
Karma:
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Senior Member |
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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?
________________________________
From: Gmclist on behalf of Carl Stouffer
Sent: Tuesday, October 24, 2017 1:24:18 PM
To: gmclist@list.gmcnet.org
Subject: Re: [GMCnet] what a difference a spring makes
Keith V wrote on Mon, 23 October 2017 20:26
> I'm really hoping for a bit of improvement MPG wise, the vacuum looks to be a bit higher, and it struggles less on uphill grades.
>
> I could see that it was going lean before the power piston started working, so the heavier spring made sense.
>
> WBO2's are cheap these days, I cost justified mine just by fuel usage. Hopefully I will be right about that ha ha ha.
>
>
> I would not use my coach as a tuning example, except that you need time and a WBO2 to do it right 😊
>
> my engine is over bored, re-camed, has C heads, filled crossover, headers and 3" exhaust. It's not stock in the least
I'm sure you're right Keith. Trying to tune the Q-jet without a WBO2 gauge would be a flying you-know-what in the dark at best. My engine is all
stock except for a double roller timing chain (set straight up) a new pair of K-heads, a Gary Rockwell intake manifold, and a Paterson distributor
with MSD dash adjustable ignition. I am running a 3" exhaust though and all that through a 3.70 final drive.
The fuel requirements would be different for a fresh engine with a different cam, for sure.
--
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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Keith Vasilakes
Mounds View. MN
75 ex Royale GMC
ask me about MicroLevel
Cell, 763-732-3419
My427v8@hotmail.com
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