carb spacer opinion please

atle · Mar 16, 2010

hey guys, did alot of searching, and I believe I have a vapor lock problem. Ruled out the starter too hot, since it will crank, just not turn over after the engine is off for even 5 minutes.

SO, after searching and reading, i'm looking to get a phenolic spacer. I have a BG 850 Might Demon with an edelbrock air-gap. My question is, should I get an Edelbrock spacer or a Barry Grant spacer??? does it really matter? and after reading i THINK i should be looking for a 4 hole...

any help appreciated, thanks.

Highway Star · Mar 16, 2010

I am not so sure the brand matters very much, more the shape. Spacers are completely dependent on the engine's individual preference. Some guys lose power with them, some gain, some with open, some 4 hole, some tapered, some tall some short.

The good thing is that they're cheap.

I think it has been established that phenolic spacers are the best insulating ones, and do a really good job of keeping heat off the carb.

atle · Mar 16, 2010

thanks Jake.

anyone with the same or similar setup to point me in the right direction? maybe i'll just call barry grant tomorrow and see what the tech has to say.

Timmy · Mar 16, 2010

An air gap intake shouldn't transfer much heat to the carb. You can get a spacer with an aluminum shield that extends under both float bowls of the Holley carb. Check your gas line. Especially where it comes out of the tank and make sure the rubber hose isn't collapsing. Make sure your fuel tank can breath, either through the charcoal canister or a vented gas cap. You can remove the cap to test for this. Make sure the fuel pump is good and clear. Maybe a larger pump than stock as they get clogged up less often but also the diaphragm in the pump can go bad. Check the carb float level. A vapor lock would be rare this time of year unless something is heating some part of the fuel system.

atle · Mar 16, 2010

Timmy said:
An air gap intake shouldn't transfer much heat to the carb. You can get a spacer with an aluminum shield that extends under both float bowls of the Holley carb. Check your gas line. Especially where it comes out of the tank and make sure the rubber hose isn't collapsing. Make sure your fuel tank can breath, either through the charcoal canister or a vented gas cap. You can remove the cap to test for this. Make sure the fuel pump is good and clear. Maybe a larger pump than stock as they get clogged up less often but also the diaphragm in the pump can go bad. Check the carb float level. A vapor lock would be rare this time of year unless something is heating some part of the fuel system.

ahh, i see. thanks Timmy. the car has hooker headers and a mechanical fuel pump. i ruled out the pump since it is easy to start in the morning. but one time during the day (50 degrees) after sitting for 2.5 hours, it was hard to start. could the fuel be boiling for that long???

i'll check the fuel lines, i noticed yesterday the fuel bowls through the sight had it at the top tick mark (there are 3). not sure what is optimal for this 850 demon carb, but it was like that when i got the car.

the only thing i've done since i got the car in december is to replace the ps pump and i just tightened the lash on the valves yesterday.

fenns70 · Mar 16, 2010

i would lower the floats so that the fuel is on the lowest mark, i had the same problem and once i lowered the floats the car fires right up (i also have a BG 850 mighty)

atle · Mar 16, 2010

fenns70 said:
i would lower the floats so that the fuel is on the lowest mark, i had the same problem and once i lowered the floats the car fires right up (i also have a BG 850 mighty)

thanks fenns70, i will give that a shot. any reason to really have the float level up that high at the highest tick mark???

fenns70 · Mar 16, 2010

honestly i don't know, but i know most guys run the lowest mark

carb spacer opinion please

atle

Highway Star

atle

Timmy

atle

fenns70

atle

fenns70

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