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Re: Vacuum Advance [message #65916 is a reply to message #65914]

Sun, 29 November 2009 08:44

Ken Burton

Messages: 10030
Registered: January 2004
Location: Hebron, Indiana

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Senior Member

rgleas wrote on Sun, 29 November 2009 08:25

The TVS switch being mounted on the return housing is sensing tempature and will not know when the engine is at idle vs. wide open throttle. Logic would dictate that this switch is dealing with a hot vs. cold engine situation. I would also believe that it was an emmissions situation.

Having work on many engines with out all of the smog adaptations less advance on a cold engine will make it run smoother during warm up.

Yes, but the hot vs. cold is relative in the case of the TVS with cold being anything less than about 225 degrees F. and hot being anything over 225 degrees F.

Basically in a normal running coach engine the TVS never trips since the engine hopefully never gets that hot. This thing sits around 6" away from the thermostat in the water channel. It should see whatever temperature the thermostat is running at (180 to 195).

The TVS only trips in an engine overheat condition. It's purpose was to increase idle speed to try to bring down the engine temperature. Obviously if it tripped when not at idle the engine speed will be controlled by the vehicle operators foot and not the TVS. At idle when the TVS trips the difference in vacuum applied to the advance could be as much as 18". At throttle positions over idle the ported vacuum is already applying vacuum to the advance so the difference between ported and manifold is only a few inches.

Ken Burton - N9KB
76 Palm Beach
Hebron, Indiana

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[Message index]

		Vacuum Advance By: jwillard on Sat, 28 November 2009 12:46
		Re: Vacuum Advance By: rgleas on Sat, 28 November 2009 12:58
		Re: Vacuum Advance By: Ken Burton on Sat, 28 November 2009 14:02
		Re: Vacuum Advance By: rgleas on Sat, 28 November 2009 14:38
		Re: [GMCnet] Vacuum Advance By: Steven Ferguson on Sat, 28 November 2009 16:18
		Re: [GMCnet] Vacuum Advance By: Ken Burton on Sat, 28 November 2009 17:10
		Re: [GMCnet] Vacuum Advance By: jwillard on Sat, 28 November 2009 17:51
		Re: [GMCnet] Vacuum Advance By: dmumert on Sat, 28 November 2009 18:22
		Re: [GMCnet] Vacuum Advance By: rgleas on Sat, 28 November 2009 20:06
		Re: [GMCnet] Vacuum Advance By: Gary Casey on Sat, 28 November 2009 20:50
		Re: [GMCnet] Vacuum Advance By: Ken Burton on Sun, 29 November 2009 15:45
		Re: Vacuum Advance By: rgleas on Sat, 28 November 2009 17:37
		Re: Vacuum Advance By: Ken Burton on Sat, 28 November 2009 22:09
		Re: Vacuum Advance By: Matt Colie on Sun, 29 November 2009 06:55
		Re: Vacuum Advance By: JohnL455 on Sat, 28 November 2009 18:57
		Re: Vacuum Advance By: JohnL455 on Sun, 29 November 2009 08:09
		Re: Vacuum Advance By: rgleas on Sun, 29 November 2009 08:25
		Re: Vacuum Advance By: mdryan on Sun, 29 November 2009 08:31
		Re: Vacuum Advance By: Ken Burton on Sun, 29 November 2009 08:44
		Re: Vacuum Advance By: Pete Papas on Sun, 29 November 2009 09:02
		Re: Vacuum Advance By: Ken Burton on Sun, 29 November 2009 09:22
		Re: Vacuum Advance By: jwillard on Sun, 29 November 2009 09:56
		Re: Vacuum Advance By: Ken Burton on Sun, 29 November 2009 14:39
		Re: Vacuum Advance By: roy1 on Sun, 29 November 2009 19:04
		Re: Vacuum Advance By: Ken Burton on Sun, 29 November 2009 23:29
		Re: [GMCnet] Vacuum Advance By: USAussie on Mon, 30 November 2009 01:01
		Re: [GMCnet] Vacuum Advance By: Ken Burton on Mon, 30 November 2009 01:53
		Re: [GMCnet] Vacuum Advance By: ljdavick on Mon, 30 November 2009 19:07
		Re: [GMCnet] Vacuum Advance By: mike miller on Mon, 30 November 2009 21:40
		Re: Vacuum Advance By: mdryan on Mon, 30 November 2009 08:01
		Re: [GMCnet] Vacuum Advance By: Jim Bounds on Mon, 30 November 2009 08:47
		Re: [GMCnet] Barbie GMC on eBay (#140362019346) By: k2gkk on Sun, 29 November 2009 11:06
		Re: [GMCnet] Vacuum Advance By: Steven Ferguson on Sun, 29 November 2009 15:49
		Re: Vacuum Advance By: fred v on Sun, 29 November 2009 14:23
		Re: Vacuum Advance By: Bob de Kruyff on Mon, 30 November 2009 16:32
		Re: Vacuum Advance By: Mike_H on Sat, 12 October 2019 10:21

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