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Assumptions, Timing, Fuel... [message #241296]

Tue, 25 February 2014 08:37

corleyw

Messages: 130
Registered: June 2007
Location: Battle Ground, WA

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Senior Member

Assumptions:
1) Retarded timing causes greater heat
2) Retarded timing causes less power
3) GMCs (both 455 and 403) must retard the timing to run on todays 87 octane regular fuel.

Leaving the ethanol considerations out of this altogether, if you are running on regular 87 octane gasoline, you probably have your timing retarded from the stock factory setting. What would happen if you advanced it a couple degrees, and ran 91/92 octane ethanol fuel?

Would it a) run cooler, and b) have better performance? If both of those are true, then would you possibly get enough better mileage, due to the engine not working so hard, as to make up for the cost differential? (Another benefit would be cooler operation, a potential cost saving down the road.)

Keep in mind that premium fuel costs only .20 or .30 cents more than regular now days, and that is only about a 3-5% increase at todays prices. Personally, I'd be willing to pay a bit more for fuel if I thought it would help the coaches performance/engine life in any way. Just maybe, running premium is actually no more expensive when everything is considered???

Just wondering what the opinion of you "experts" is on this... (I do not expect any sort of consensus on this subject.)

Corley '76 Glenbrook 29 other vehicles

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[Message index]

		Assumptions, Timing, Fuel... By: corleyw on Tue, 25 February 2014 08:37
		Re: Assumptions, Timing, Fuel... By: Chris Tyler on Tue, 25 February 2014 10:06
		Re: Assumptions, Timing, Fuel... By: mikethebike on Tue, 25 February 2014 12:48
		Re: Assumptions, Timing, Fuel... By: tphipps on Tue, 25 February 2014 14:54
		Re: [GMCnet] Assumptions, Timing, Fuel... By: Jim Bounds on Tue, 25 February 2014 15:56
		Re: [GMCnet] Assumptions, Timing, Fuel... By: jhbridges on Tue, 25 February 2014 18:24
		Re: Assumptions, Timing, Fuel... By: Matt Colie on Tue, 25 February 2014 12:20
		Re: Assumptions, Timing, Fuel... By: Ken Burton on Tue, 25 February 2014 12:31
		Re: Assumptions, Timing, Fuel... By: corleyw on Wed, 26 February 2014 09:41
		Re: Assumptions, Timing, Fuel... By: A Hamilto on Wed, 26 February 2014 12:01
		Re: [GMCnet] Assumptions, Timing, Fuel... By: James Hupy on Wed, 26 February 2014 12:19
		Re: Assumptions, Timing, Fuel... By: Ken Burton on Wed, 26 February 2014 12:12
		Re: Assumptions, Timing, Fuel... By: corleyw on Wed, 26 February 2014 12:50
		Re: Assumptions, Timing, Fuel... By: mikethebike on Wed, 26 February 2014 17:35
		Re: Assumptions, Timing, Fuel... By: A Hamilto on Wed, 26 February 2014 17:43
		Re: Assumptions, Timing, Fuel... By: George Beckman on Wed, 26 February 2014 18:28
		Re: Assumptions, Timing, Fuel... By: Matt Colie on Wed, 26 February 2014 19:40
		Re: Assumptions, Timing, Fuel... By: mrgmc3 on Wed, 26 February 2014 22:59
		Re: Assumptions, Timing, Fuel... By: A Hamilto on Wed, 26 February 2014 23:31
		Re: Assumptions, Timing, Fuel... By: corleyw on Thu, 27 February 2014 00:35
		Re: Assumptions, Timing, Fuel... By: Bullitthead on Thu, 27 February 2014 01:08
		Re: Assumptions, Timing, Fuel... By: Ken Burton on Thu, 27 February 2014 06:00
		Re: [GMCnet] Assumptions, Timing, Fuel... By: jhbridges on Thu, 27 February 2014 06:49
		Re: Assumptions, Timing, Fuel... By: mikethebike on Thu, 27 February 2014 07:00
		Re: Assumptions, Timing, Fuel... By: A Hamilto on Thu, 27 February 2014 10:35
		Re: Assumptions, Timing, Fuel... By: mrgmc3 on Thu, 27 February 2014 23:21
		Re: Assumptions, Timing, Fuel... By: Carl S. on Tue, 25 February 2014 15:39
		Re: Assumptions, Timing, Fuel... By: roy1 on Wed, 26 February 2014 12:15
		Re: Assumptions, Timing, Fuel... By: Carl S. on Wed, 26 February 2014 15:01
		Re: Assumptions, Timing, Fuel... By: JohnL455 on Tue, 25 February 2014 18:40
		Re: [GMCnet] Assumptions, Timing, Fuel... By: USAussie on Tue, 25 February 2014 19:28
		Re: Assumptions, Timing, Fuel... By: JohnL455 on Wed, 26 February 2014 17:18
		Re: Assumptions, Timing, Fuel... By: Matt Colie on Thu, 27 February 2014 08:18
		Re: Assumptions, Timing, Fuel... By: WildBill on Thu, 27 February 2014 13:57
		Re: Assumptions, Timing, Fuel... By: JohnL455 on Thu, 27 February 2014 20:53
		Re: Assumptions, Timing, Fuel... By: WildBill on Thu, 27 February 2014 21:17
		Re: Assumptions, Timing, Fuel... By: Ken Burton on Fri, 28 February 2014 03:46
		Re: Assumptions, Timing, Fuel... By: corleyw on Sat, 01 March 2014 12:06
		Re: Assumptions, Timing, Fuel... By: Ken Burton on Sat, 01 March 2014 13:49
		Re: [GMCnet] Assumptions, Timing, Fuel... By: USAussie on Sat, 01 March 2014 16:40
		Re: Assumptions, Timing, Fuel... By: mikethebike on Sat, 01 March 2014 14:31
		Re: Assumptions, Timing, Fuel... By: Ken Burton on Sat, 01 March 2014 17:41
		Re: Assumptions, Timing, Fuel... By: mikethebike on Sat, 01 March 2014 18:21
		Re: Assumptions, Timing, Fuel... By: corleyw on Sat, 01 March 2014 16:24
		Re: Assumptions, Timing, Fuel... By: Matt Colie on Sat, 01 March 2014 21:35
		Re: Assumptions, Timing, Fuel... By: Ken Burton on Sun, 02 March 2014 05:22
		Re: [GMCnet] Assumptions, Timing, Fuel... By: jhbridges on Sun, 02 March 2014 09:15
		Re: [GMCnet] Assumptions, Timing, Fuel... By: Ken Burton on Sun, 02 March 2014 11:52
		Re: [GMCnet] Assumptions, Timing, Fuel... By: jhbridges on Sun, 02 March 2014 13:35
		Re: Assumptions, Timing, Fuel... By: Bob de Kruyff on Sun, 02 March 2014 19:27

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