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Re: [T3] Poor hot performance.


I've had this problem in the summer with other carbed vehicles, the
Square has FI, so no problems with that.  Basically the carb bowl(s)
boil dry after shutoff and it takes awhile to pump the gas level up
far enough for the jets to start working.  You can also get vapor
lock, where the gas actually vaporizes in the fuel line, leaving the
pump with nothing substantial to suck. This can happen while running,
usually in stop and go city traffic.  Another ill that FI doesn't
have.  You had the right idea, just in the wrong location.  The only
sure cure is cooler weather or higher boiling point fuel.

On Wed, 14 Jul 1999 13:46:56 +0300, you wrote:

>Typ 3,
>
>I have been having some trouble with my engine that I suspect is related to
>this strange spate of hot weather we have been experiencing up here in the
>insect-infested swamps of Northeastern Europe (Finland).  For about the
>last month, it has been between 25C and 32C, non-stop.
>
>Anyway, the problem goes like this: the engine runs fine after the initial
>start-up and still fine after I have been driving around for 30 minutes.
>However, if I turn off the engine and then re-start say, 10 minutes later,
>the idle is uneven, acceleration is piss-poor and it even feels like I am
>not running on all cylinders.  If I make a roadtrip (more than 75km), shut
>down and restart, it is even worse and sometimes takes 5 seconds of
>cranking to get the engine started.  Fuel economy is about the same as
>always - 9l/100km - and I have not noticed any other problems.
>
>The engine is a basically stock 1584cc mill, with 34mm FRD carbs, Facet
>electronic fuel pump, CR is 9.5:1, 009 distributor, Crane XR-700 optically
>triggered points box and I use only 99 octane leaded fuel ($4.75 a gallon).
>The engine has been driven 8.500 km since the total rebuild last August and
>has otherwise performed flawlessly.  I recently lubed and adjusted the
>worthless hexbar linkage, adjusted the valves, cleaned the Crane eD~n
>the distributor, balanced the carbs and washed the windows.
>
>Still the problem persists.
>
>My only thought is that due to the heat, the fuel is vaporizing in the
>carbs before it has a chance to enter the heads or while it is travelling
>the short journey down the intake manifolds to the combustion chamber.
>Obviously, if this is the problem, I will just have to wait for winter and
>it will go away.
>
>Has anyone from the heat-belt noticed any similar hot weather performance
>problems?
>
>Help.
>
>Patrick
>Patrick Joel Morton
>Rauhankatu 28 as 27
>FIN -- 20100  TURKU
>Finland, E.U.
>
>Home of the V-Wauhtipiste Volkswagens!
>
>                 - "Kraft durch Freude" -
>
>1963 Beetle (Helmut) - Deluxe Limousine
>1967 Variant (Urs) - Squareback
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>
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>
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