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#1 |
Registered User
Join Date: Mar 2015
Location: Fletcher, N.C.
Posts: 309
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Phenolic spacer
After rebuilding the carb yesterday I decided to install the 1" spacer due to percolating. I surely hope it lives up to all the hype...
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#2 |
Senior Member
![]() Join Date: Dec 2011
Location: South Carolina
Posts: 2,662
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Re: Phenolic spacer
We all support better performance tweaks but that fuel line should really be addressed.
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#3 |
Registered User
Join Date: Mar 2015
Location: Fletcher, N.C.
Posts: 309
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Re: Phenolic spacer
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#4 |
Registered User
Join Date: May 2014
Location: Matamoras, PA
Posts: 397
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Re: Phenolic spacer
It should help. Hard to see in the picture, but I've got 2" aluminum spacers.
I definitely noticed an improvement, and the phenolic spacer should help even more with heat soak. As for the rubber fuel line, I've been running them for years without issue. Hard lines do look better though. |
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#5 |
Senior Member
![]() Join Date: Sep 2007
Location: Albuquerque NM
Posts: 7,848
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Re: Phenolic spacer
how can you tell if you need to use a spacer? i have the same carb on my build with a street avenger intake but havent started the motor yet.
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1967custom |
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#6 |
Registered User
Join Date: May 2014
Location: Matamoras, PA
Posts: 397
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Re: Phenolic spacer
From my experience, you only need them if you're having a heat soak problem/vapor lock, or need more room around the carb(s).
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#7 |
Registered User
![]() Join Date: Dec 2012
Location: Chandler AZ
Posts: 1,149
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Re: Phenolic spacer
Being I live in AZ and the temps are high in the summer I have run a 1" phenolic spacer on my carbs for years. I have found it helps on restarts. There were times the engine would crank slowly after running then sitting. The fuel was boiling out of the carb and down into the manifold.
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1970 Longhorn, Front Disc, 350/4 bolt, 882 heads, HEI, Edelbrock, 700R4, HO-52/4.11. 1996 Corvette, Collector Roadster, LT4, 396, 450RWHP, 6sp, 4.11/Dana44/posi 5 point roll bar And let us not grow weary of doing good, for in due season we will reap, if we do not give up. Gal 6:9 |
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#8 |
Florida Edition
![]() ![]() Join Date: Oct 2010
Location: Fruitland Park, FL
Posts: 4,025
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Re: Phenolic spacer
Laminated wooden spacers have always worked well for heat soak / vapor lock.
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70 GMC Short Stepside "Rose"-An American Beauty: Factory 402/TH400, AM/FM, AC, Tilt, Tach, Buckets, Posi, PS, PB, 3-5 Drop, Complete Resto-Rod 67 C-20 Slant Back Wrecker "Mad Max" 67 C-10 Ratrod "Step-N-Wolf" 71 Serro Scotty Sportsman camper "Scotty" 97 LT1 Z28 "The Hornet" Link to more pics of "Rose" http://67-72chevytrucks.com/vboard/a...p?albumid=1684 Check out my "Cheap Tricks" thread and add to it if you can, lots of good info there. http://67-72chevytrucks.com/vboard/s...d.php?t=489394 |
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#9 |
Senior Member
![]() Join Date: Sep 2007
Location: Albuquerque NM
Posts: 7,848
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Re: Phenolic spacer
i live in a hot environment too. if the gas seems to be coming out the bottom of the carb after stopping the truck could that mean i have percolating also? new gaskets
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1967custom |
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#10 |
Registered User
Join Date: Sep 2012
Location: Layton, Utah
Posts: 186
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Re: Phenolic spacer
percolating? My truck is hard to start at times and my fuel was bubbling in the clear fuel filter last summer. Is that effect considered Percolating? If so, going to pick up a spacer for my carb.
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James B. 1967 Chevy Fleetside Shortbed 4X2 (Black & Beautiful) 1971 Chevy Fleetside Shortbed 4X4 (White & Rough) |
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#11 | |
Registered User
Join Date: Jan 2009
Location: Calgary, AB
Posts: 1,181
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Re: Phenolic spacer
Quote:
If you see the fuel bubbling in your fuel filter then it should be removed from heat sources. |
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#12 |
Registered User
Join Date: Aug 2009
Location: Bowser
Posts: 13,611
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Re: Phenolic spacer
For any carbs like the eddelbrock or a quadrajet I use a wood or phenolic spacer.
For carbs like the holley with the float bowls hanging on either end I use a heat plate to deflect the heat away from the bowls. Post #5 in this link has a heat plate. http://www.hotrodders.com/forum/carb...ld-123374.html |
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#13 |
Registered User
Join Date: Feb 2011
Location: Modesto, CA
Posts: 2,188
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Re: Phenolic spacer
What hype are you hoping it lives up to, reducing heat soak or power adder? I'm just kidding about the power adder thing, I've just been running across that a lot lately on FB. As a tool to reduce heat soak it's pretty effective in my experience.
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#14 |
Registered User
Join Date: Mar 2015
Location: Fletcher, N.C.
Posts: 309
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Re: Phenolic spacer
Well I'll have to say, so far so good. The clear fuel filter is not bubbling (due to siphoning into the carb) and no gas boiling over down to the butterflies.
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#15 | |
Registered User
![]() Join Date: Dec 2012
Location: Chandler AZ
Posts: 1,149
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Re: Phenolic spacer
Quote:
Does fuel with alcohol evaporate or boil at a lower point? Could that also add to the issue?
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1970 Longhorn, Front Disc, 350/4 bolt, 882 heads, HEI, Edelbrock, 700R4, HO-52/4.11. 1996 Corvette, Collector Roadster, LT4, 396, 450RWHP, 6sp, 4.11/Dana44/posi 5 point roll bar And let us not grow weary of doing good, for in due season we will reap, if we do not give up. Gal 6:9 |
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#16 | |
Registered User
Join Date: Mar 2015
Location: Fletcher, N.C.
Posts: 309
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Re: Phenolic spacer
Quote:
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#17 |
Registered User
Join Date: May 2008
Location: Mesa, AZ
Posts: 281
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Re: Phenolic spacer
I have some experience with fuel percolation.
More so on my '74 VW. Today's fuels have a lower vapor (boiling?) point than they did in the 70s. Hot restarts are a hassle requiring me to hold the pedal to the floor and crank for several seconds, followed by throttle feathering until it'll idle on its own. I've tried a lower float level, but it causes drivability problems under light acceleration. The "correct" float level will lead to fuel drip from the main nozzle. There are no phenolic spacers available for old aircooled VWs. I'd imagine the problem is less severe in our old Chevys. The carburetor is larger, and so's the engine room. Some Chevys used a heat shield to block radiant heat coming up from the intake area. Does anyone know which models had these? --Mike
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I own 3 classic vehicles. 1971 LWB C10 Deluxe. 1974 VW Super Beetle. 1971 VW Fastback. The C10 and the Super Beetle run, the Fastback is just not there yet! Please visit my Super Beetle and Fastback profile on TheSamba. |
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#18 |
Registered User
Join Date: Aug 2009
Location: Bowser
Posts: 13,611
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Re: Phenolic spacer
Only the holley equipped chevy's had heat plates. Z28 302 was one.
Even though they don't make a spacer for a vw doesn't mean you can't make one. First one I used I made out of wood. Wood is the best insulator! |
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