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Old 07-17-2008, 09:47 AM
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Carb Spacer Question

When hot my 355 sbc cranks over when starting several more times than when cold. A friend suggested that heat may be affecting the fuel in the carb bowls and causing the engine to turn over more than it should.
Would a wood or phenolic spacer assist in reducing the heat transfer to the carb and would I need to retune my carb if I added say a 1" spacer?
The carb is an Edelbrock Performer 600 cfm. Any thoughts on an open spacer versus a 4 hole spacer?

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Old 07-17-2008, 09:55 AM
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If you are running headers it could be causing the starter to get hot and therefore turn slower.....if so you could install a heat shield or use one of the remote starter solinoid kits that Jegs has to eliminate the problem.
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Old 07-17-2008, 10:02 AM
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Quote:
Originally Posted by Henry Highrise
If you are running headers it could be causing the starter to get hot and therefore turn slower.....if so you could install a heat shield or use one of the remote starter solinoid kits that Jegs has to eliminate the problem.
Thanks Henry. I guess that is another possibility however it does not seem to crank any slower when hot vs. cold. I already have a shielded mini starter on this thing so thats why i am thinking its carb related.
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Old 07-17-2008, 02:00 PM
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your friend is refering to "vapor lock" aka "fuel boiling" in the carb from heat soak when turned off hot as causing the starting problem....
for about $10 you can try a approx 3/8" thick carb insulator gasket from your local store which won't affect your tune up much.....my bet: 10% chance it will start better....normally a vapor locked motor is a total PIA to get started...

try this simple/easy test to help sort out is it fuel or electricity...
hook up a batt jumper cable from the batt neg post to the starter motor body or close to it on the aluminum bell housing....
hook up a jumper wire from the batt neg to the aluminum body of the dist....
see if it doesn't start alot quicker.....
(and/or just hook up jumpers to a 2,000rpm running car so your batt has 14V when cranking and alot more grounds source and see if it won't start alot quicker)

post results.....

LOL, my car is rigged with a ign bypass switch so that it WON'T start instantly when cold which it will do....
I crank it till I do see oil pressure then crank it again with the ign switch turned on and let it start.....
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Old 07-17-2008, 02:26 PM
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Quote:
Originally Posted by Regal Beagle
When hot my 355 sbc cranks over when starting several more times than when cold. A friend suggested that heat may be affecting the fuel in the carb bowls and causing the engine to turn over more than it should.
Would a wood or phenolic spacer assist in reducing the heat transfer to the carb and would I need to retune my carb if I added say a 1" spacer?
The carb is an Edelbrock Performer 600 cfm. Any thoughts on an open spacer versus a 4 hole spacer?
If you get a spacer, make it open.
Have a read of this thread.
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Old 07-17-2008, 04:13 PM
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Look in the Knowledge Base, 7th one down,
http://www.hotrodders.com/kb/carburetor-articles-2
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Luv the smell of NITRO in the morning.
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Old 07-18-2008, 07:04 AM
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here's another excellent spacer explanation article....

http://www.gnetworks.com/v4files/bar...h%20images.pdf

all the oem's did use 2V-2hole and 4V-4 hole spacers on some car model combo's.....
usually a heavy car/small cube motor/tall gears....
it helps build a bit more low RPM's TQ for a more decent acceleration rate driving normal....

go to a yard or swap meet and get one for $5?....
try it is the only way to find out if your particular motor combo does truly want one....
4 hole didn't help, grind it to a open spacer and try that....
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