| [GMCnet] Fuel temp required to prevent vapor lock [message #88234] |
Sat, 12 June 2010 10:23  |
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USAussie
Messages: 15912
Registered: July 2007
Location: Sydney, Australia
Karma: 6
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Senior Member |
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G’day,
What temperature would the fuel temp have to be reduced to in order to
prevent vapor lock?
Regards,
Rob Mueller
Sydney, Australia
AUS '75 Avion-The Blue Streak TZE365V100428
USA '75 Avion-Double Trouble TZE365V100426
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Regards,
Rob M. (USAussie)
The Pedantic Mechanic
Sydney, Australia
'75 Avion - AUS - The Blue Streak TZE365V100428
'75 Avion - USA - Double Trouble TZE365V100426
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| Re: [GMCnet] Fuel temp required to prevent vapor lock [message #88242 is a reply to message #88234] |
Sat, 12 June 2010 12:09  |
g.winger
Messages: 792
Registered: February 2008
Location: Warrenton,Missouri
Karma: 0
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Senior Member |
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There are varables. How good is your gas? Its my understanding the gasoline boils at diffrent temps. Depending on how it was "refined". Altitude makes a diffrence. Gas almost never boils on the pressure side unless its really hot. When the pressure is reduced, ie. the suction side it boils at a lower temp. Kinda like water boiling out of your AC system at 70 deg. when its being pulled down before adding freon. Thats why several GMC,s reported VL going up that big hill a couple years ago on the way to Estes Park. I was there and the tranny fluid hit 260. No vapor lock and it was 85-90, from what I remember. Can,t recall the altitude. Hope this helps,,,,,PL
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| Re: [GMCnet] Fuel temp required to prevent vapor lock [message #88255 is a reply to message #88242] |
Sat, 12 June 2010 14:19 |
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hnielsen2
Messages: 1434
Registered: February 2004
Location: Alpine CA
Karma: 0
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Senior Member |
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Netters'
Our wonderful gas now will boil at 98 no matter what grade.
I installed aluminum diamond plate from the front to back under the tanks
with upturn in front of the first tank.
Using 3/4 " spacers and sheet metal screws
This blocks the heat from engine and the road surface.
I have tried to post photos and some how I can't do that on this site.
Yes I know I can add them to the GMC photo site and then you can down load
the photos.
I have not taken the time to do so, Sorry.
I think you get the idea.
I have also add four quarts of Marvel Mystery Oil to the fuel coming back
from Los Vegas once.
Some one said ATF would also work and others thought I was NUTS!
Saying the oil to fuel ratio would not help with vapor lock?
Worked for us.
Thanks
Howard
Alpine Ca
26' Canyon Lands
Not quite stock with 455, Howell F I, Roller Rockers, and Cam from Jim B.
Torque 477 pounds HP 350 we don't need no stinking H P we need TORQUE!
----- Original Message -----
From: "Paul Leavitt" <leavittpaul@yahoo.com>
Subject: Re: [GMCnet] Fuel temp required to prevent vapor lock
>
>
> There are varables. How good is your gas? Its my understanding the
> gasoline boils at diffrent temps. Depending on how it was "refined".
> Altitude makes a diffrence. Gas almost never boils on the pressure side
> unless its really hot. When the pressure is reduced, ie. the suction side
> it boils at a lower temp. Kinda like water boiling out of your AC system
> at 70 deg. when its being pulled down before adding freon. Thats why
> several GMC,s reported VL going up that big hill a couple years ago on the
> way to Estes Park. I was there and the tranny fluid hit 260. No vapor lock
> and it was 85-90, from what I remember. Can,t recall the altitude. Hope
> this helps,,,,,PL
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All is well with my Lord
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| Re: [GMCnet] Fuel temp required to prevent vapor lock [message #88368 is a reply to message #88339] |
Sun, 13 June 2010 10:54 |
James Hupy
Messages: 6806
Registered: May 2010
Karma: -62
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Senior Member |
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I believe that current formulation winter blend fuel will boil at about 90
Degrees Celcius at normal (14.7 psi) atmospheric pressure at 50 percent
relative humidity. Summer blend is a few degrees warmer than that. Not hard
to see that temp under the hood of our GMC's. The Wonderfuel (wonder what
they have added to it this week) is made for fuel injection, not carbs. As
the flight controllers tell pilots with terroists on board, YOYO! You're On
Your Own.
On Sun, Jun 13, 2010 at 4:41 AM, Gary Casey <casey.gary@yahoo.com> wrote:
> I once had a Porsche that had a fuel cooler - the fuel line went through a
> heat exchanger on the cold side of the air conditioner. Might be an
> idea....
> Gary
>
>
> G?day,
>
> What temperature would the fuel temp have to be reduced to in order to
> prevent vapor lock?
>
> Regards,
> Rob Mueller
>
>
>
> _______________________________________________
> GMCnet mailing list
> List Information and Subscription Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>
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