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Re: [GMCnet] what a difference a spring makes [message #325360 is a reply to message #325359]

Mon, 23 October 2017 22:26

Keith V

Messages: 2337
Registered: March 2008
Location: Mounds View,MN

Karma:

Senior Member

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 boared, re-camed, has C heads, filled crossover, headers and 3" exhaust. It's not stock in the least.

________________________________
From: Gmclist on behalf of Carl Stouffer
Sent: Monday, October 23, 2017 9:19:29 PM
To: gmclist@list.gmcnet.org
Subject: Re: [GMCnet] what a difference a spring makes

Keith,

It will be interesting to see if this change has any effect on your fuel economy.

I don't have an A/F gauge, so I don't have access to the info you have, but my spark plugs indicate a slightly lean mixture even with #72 main jets.
I have no idea which power piston spring is in my carb, but it sounds like it may be worth my while to change it to the one you recommend just to be
sure.

I have always read (on this forum) that the proper spring is red, but I think the color code may have been changed and the important thing is the
vacuum spec on the spring, not the color.
--
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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[Message index]

		[GMCnet] what a difference a spring makes By: Keith V on Mon, 23 October 2017 20:07
		Re: [GMCnet] what a difference a spring makes By: Carl S. on Mon, 23 October 2017 21:19
		Re: [GMCnet] what a difference a spring makes By: Keith V on Mon, 23 October 2017 22:26
		Re: [GMCnet] what a difference a spring makes By: Carl S. on Tue, 24 October 2017 13:24
		Re: [GMCnet] what a difference a spring makes By: Keith V on Tue, 24 October 2017 13:37
		Re: [GMCnet] what a difference a spring makes By: Carl S. on Tue, 24 October 2017 15:12
		Re: [GMCnet] what a difference a spring makes By: James Hupy on Tue, 24 October 2017 15:19
		Re: [GMCnet] what a difference a spring makes By: Matt Colie on Tue, 24 October 2017 17:15
		Re: [GMCnet] what a difference a spring makes By: Keith V on Wed, 25 October 2017 14:22

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