<VV> Hot starting advice

[Mark Durham]

Chuck, do you need to give the engine that throttle boost to start? My
car starts without touching the gas pedal accept when cold. I solved my
hot start problem by lowering the fuel level in the carb bowls a bit,
then also figured out that the fuel pump was overpowering the needle
and seat, filling up the bowls and overflowing into the intakes,
causing the flooding and black smoke, so I added a fuel pressure
regulator, and when adjusted it to give just enough fuel to go down the
road, and pass another car, the hot starting disappeared. Mark Durham

Sent from my Windows Phone
From: chuck mckinley
Sent: 3/18/2012 9:38
To: shortle
Cc: virtualvairs at corvair.org; BobHelt at aol.com
Subject: Re: <VV> Hot starting advice
The car typically sits the order of 10-15 minutes (and stays hot.) I
only have to crank the engine for one second or less, just a couple
turns of the starter - as I say, it's really no big deal. It's just that
it starts with a big load of gas from the accelerator pump, so it starts
up with high rpm and makes me look like some kind of high-school Harry
in the parking lot! The choke has definitely come off by the time this
is happening. I guess I mis-stated the item about the unloader. I just
put in new plugs (NGK) gapped to .035 per instructions. I do not have
insulators under the carbs, just the thin gaskets that came with the
rebuild kits. I had the thick insulators on the car prior to the carb
rebuild, but they pretty much fell apart when I pulled the carbs, as
they'd been there for about six years. I got the rebuild kits from a
FLAPS, not Clark's, else I would have ordered the insulators. If they're
considered crucial I'll get a pair.

Chuck

On Sun, 2012-03-18 at 10:20 -0600, shortle wrote:
> Hi Chuck,
> Of course Bob Helts book on identifying and rebuilding Corvair Rochester carbs is invaluable and has helped me a number of times.

> You failed to mention how long your car sits before this occurs and how long you have to crank the engine before it will start.

> (When you mention "unloader" it leads me to think your car is actually cooled off enough for the choke to be involved).

> Is your choke adjustment too stiff? Try disconnecting both choke rods after car warms up and see if this issue is still there?

> Do you have the insulators under the carbs?
> Do you have the correct spark plugs with the proper gap? Just a few thoughts from cold and chilly SW Colorado.
> Good luck and please post results and findings.
> Timothy Shortle in Durango Colorado
> PS You also maybe close to Corvair Master Technician Spence Shepherd if worse comes to worse
>
>
>
> -----Original Message-----
> >From: BobHelt at aol.com
> >Sent: Mar 18, 2012 10:02 AM
> >To: cmckinley313 at verizon.net, virtualvairs at corvair.org
> >Subject: Re: <VV> Hot starting advice
> >
> >chuck,
> >It could be any number of causes. Most likely is that the carburetors
> >floats are set too high allowing the fuel in the bowl to be too high. This can
> >cause engine heat to percolate the fuel and run raw gas into the engine
> >after  shut off.
> >Another possibility is that you have carburetors that lack sufficient
> >venting to disipate fuel fumes after a hot shut down. This is explained in  my
> >book on H and HV carburetors. It wasn' t until 1964 that Chevrolet got the
> >venting problem fixed. If that is your problem, then get a pair of 1964 or
> >later carburetors for your engine.
> >Regards,
> >Bob Helt
> >
> >
> >In a message dated 3/18/2012 7:36:52 A.M. US Mountain Standard Time,
> >cmckinley313 at verizon.net writes:
> >
> >However,  when I drive somewhere far enough to get the engine warmed up
> >and then park  (on grocery runs, etc.), I have to use the technique of
> >flooring the  accelerator to engage the unloader to start it up again. It
> >always starts  without hassle, so maybe there's no real issue, but I'm
> >wondering if  there's any tweak that can be made to minimize  this
> >pattern
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