Home » Public Forums » GMCnet » The pause that makes you heart skip
Re: [GMCnet] The pause that makes you heart skip [message #70945 is a reply to message #70942] |
Sat, 16 January 2010 09:44 |
Steven Ferguson
Messages: 3447 Registered: May 2006
Karma:
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Senior Member |
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Very informative post Matt. Like I said before, I sure wish you could
do a complete data dump all at once so we could just archive it when
we need it.
On Sat, Jan 16, 2010 at 7:42 AM, Matt Colie <mcolie@chartermi.net> wrote:
>
>
> GMCWiperMan wrote on Sat, 16 January 2010 00:31
>> By the way, how the heck can vacuum push gasoline to the booster?
>>
>> Ken H.
>
> Ken,
>
> As a friend used to say, "It is the perverse nature of inanimate objects."
>
> But to actually answer your question:
> A conventional carburetor does not actually vaporize fuel very well at all and in actual fact it spills a mixture of liquid fuel and air into the intake manifold. (We often referred to the device our coaches have as a solid fuel carburetor in the lab to differentiate it from a gaseous fuel (like LPG) device.)
>
> The intake depression (vacuum) that is used to motivate so many things is temporary at best. Its coming and going invites an unexpected (to some) number of issues.
>
> We expected (and on several occasions verified) that the liquid fuel would impact and stick to the interior surface of the intake runners. That liquid fuel will then be right there at the manifold taps and waiting for any system pressure reversal. A cold engine stall is a guaranteed "gotcha". When the vacuum goes away (Map=30hg) the pressure in all those connected things is now lower than manifold. All check valves can be counted on to leak to some extent at some time. If it happens at the right time, there is wet fuel waiting to be sucked in. Even if the check valve does not actually leak, the described pressure reversals will cause the connecting tubing to become filled with wet fuel. We found wet fuel in the HVAC operators and transmission modulators. I have seen brake boosters full to the check valve, but that is not common.
>
> A variety of popular Japanese car that was not fitted with power brakes in the home market had a very bad case of this. The vacuum tube routing would cause the booster fill with fuel that would dump into the manifold when the brakes were released. Since it also had an automatic transmission that was not used in the home market, the engine would stall. As a contract house, we cured the "fire goes out when you try to go" by rerouting the brake booster's vacuum line and including a loop of steel line to trap fuel until underhood temps could encourage it to go back into the manifold.
>
> Fun stuff - Huh?
>
> Matt
> --
> Matt & Mary Colie
> '73 Glacier 23 Chaumiere (say show-me-air)
> SE Michigan
> _______________________________________________
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--
Steve Ferguson
'76 EII
Sierra Vista, AZ
Urethane bushing source
www.bdub.net/ferguson/
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The pause that makes you heart skip
By: jtblank on Tue, 12 January 2010 01:49
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Re: [GMCnet] The pause that makes you heart skip
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Re: The pause that makes you heart skip
By: RF_Burns on Tue, 12 January 2010 07:45
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Re: The pause that makes you heart skip
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Re: [GMCnet] The pause that makes you heart skip
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Re: The pause that makes you heart skip
By: jtblank on Thu, 14 January 2010 02:55
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Re: The pause that makes you heart skip
By: midlf on Thu, 14 January 2010 03:17
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Re: [GMCnet] The pause that makes you heart skip
By: jimk on Fri, 15 January 2010 09:18
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Re: [GMCnet] The pause that makes you heart skip
By: USAussie on Fri, 15 January 2010 17:40
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Re: [GMCnet] The pause that makes you heart skip
By: jimk on Fri, 15 January 2010 20:50
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Re: The pause that makes you heart skip
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Re: [GMCnet] The pause that makes you heart skip
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Re: [GMCnet] The pause that makes you heart skip
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Re: [GMCnet] The pause that makes you heart skip
By: USAussie on Fri, 15 January 2010 21:28
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Re: [GMCnet] The pause that makes you heart skip
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Re: [GMCnet] The pause that makes you heart skip
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Re: [GMCnet] The pause that makes you heart skip
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Re: [GMCnet] The pause that makes you heart skip
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Re: [GMCnet] The pause that makes you heart skip
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Re: [GMCnet] The pause that makes you heart skip
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Re: [GMCnet] The pause that makes you heart skip
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Re: [GMCnet] The pause that makes you heart skip
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Re: [GMCnet] The pause that makes you heart skip
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Re: [GMCnet] The pause that makes you heart skip
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Re: [GMCnet] The pause that makes you heart skip
By: USAussie on Sat, 16 January 2010 13:38
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Re: [GMCnet] The pause that makes you heart skip
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Re: [GMCnet] The pause that makes you heart skip
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Re: [GMCnet] The pause that makes you heart skip
By: USAussie on Sat, 16 January 2010 17:01
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Re: [GMCnet] The pause that makes you heart skip
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Re: [GMCnet] The pause that makes you heart skip
By: USAussie on Sat, 16 January 2010 21:28
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Re: [GMCnet] The pause that makes you heart skip
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Re: [GMCnet] The pause that makes you heart skip
By: USAussie on Sun, 17 January 2010 07:38
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Re: [GMCnet] The pause that makes you heart skip
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Re: [GMCnet] The pause that makes you heart skip
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Re: [GMCnet] The pause that makes you heart skip
By: USAussie on Sun, 17 January 2010 17:33
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Re: [GMCnet] The pause that makes you heart skip
By: Kosier on Sat, 16 January 2010 20:58
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Re: [GMCnet] The pause that makes you heart skip
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Re: [GMCnet] The pause that makes you heart skip
By: USAussie on Sun, 17 January 2010 07:40
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Re: [GMCnet] The pause that makes you heart skip
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Re: [GMCnet] The pause that makes you heart skip
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Re: [GMCnet] The pause that makes you heart skip
By: Dennis S on Sun, 17 January 2010 09:37
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Re: [GMCnet] The pause that makes you heart skip
By: Dennis S on Sun, 17 January 2010 09:39
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Re: [GMCnet] The pause that makes you heart skip
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Re: [GMCnet] The pause that makes you heart skip
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[GMCnet] Photo Site Editing (was: The pause that makes you heart skip)
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Re: [GMCnet] Photo Site Editing (was: The pause that makes you heart skip)
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Re: [GMCnet] Photo Site Editing (was: The pause that makes you heart skip)
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Re: [GMCnet] Photo Site Editing (was: The pause that makes you heart skip)
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Re: [GMCnet] Photo Site Editing (was: The pause that makes you heart skip)
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Re: [GMCnet] Photo Site Editing (was: The pause that makes you heart skip)
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Re: [GMCnet] Photo Site Editing (was: The pause that makes youheart skip)
By: USAussie on Tue, 19 January 2010 16:41
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Re: [GMCnet] Photo Site Editing (was: The pause that makes youheart skip)
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Re: [GMCnet] Photo Site Editing (was: The pause that makes you heart skip)
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Re: [GMCnet] Photo Site Editing (was: The pause that makes you heart skip)
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Re: [GMCnet] Photo Site Editing (was: The pause that makes you heart skip)
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Re: [GMCnet] Photo Site Editing (was: The pause that makes you heart skip)
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Re: [GMCnet] Photo Site Editing (was: The pause that makesyou heart skip)
By: USAussie on Wed, 20 January 2010 17:16
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Re: [GMCnet] Photo Site Editing
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Re: [GMCnet] Photo Site Editing
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Re: [GMCnet] Photo Site Editing (was: The pause that makes you heart skip)
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Re: The pause that makes you heart skip
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vapor lock
By: bukzin on Thu, 14 January 2010 23:01
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Re: The pause that makes you heart skip
By: RF_Burns on Sat, 16 January 2010 09:20
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