carb spacers??????
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Post Fiend
Joined: Dec 2003
Posts: 6,658
Likes: 4
From: "Islander"
carb spacer, heat and rpm drop
Ranchero77, the product looks good but i have a question, how can they state "helps reduce temperature" when it's made of aluminum? Now if they made it out of phenolic i'd believe their statement. On what difference a standard spacer makes on an engine, i was told by Edelbrock Tech that the torque will lower by 250 rpm per 1/2" spacer added, that is with a 4-hole spacer. Lower by 500 with a 1" spacer. Your motor will sign off sooner at top end by the same amount. Phenolic 4-hole spacers (aluminum also) come in different bore diameters, to get the most out of them you need to have the spacer bore match your throttle bore. Use a smaller spacer and mill to carb bore diameter, this allows for smooth air/fuel flow. $.02. Carl....o&o>........
Elder User
Joined: Jul 2004
Posts: 938
Likes: 1
From: North Carolina
You can make one out of wood if you want. Its cheaper and wood cools the carb better then plastic or rubber. Making one out of wood would be quite simple if you think about it just trace it with a template and get a jigsaw and have at it.
Post Fiend
Joined: Dec 2003
Posts: 6,658
Likes: 4
From: "Islander"
Making carb spacers
Ford352, for only $32 i had a phenolic spacer that i put on the Bridgeport mill and bored to match the carb bore, this took 15 minutes. Phonelic would less likely cause warpage problems to the carb base than wood when torqued down. Yes wood would keep the heat away. Question, what's your time worth? Carl.........o&o>.......
Senior User
Joined: Oct 2003
Posts: 347
Likes: 0
From: in a house
anything thats non metalic will reduce heat transfered to the carb best. aluminum or phenolic is your better choice over wood or plastic for resistence to the heat and fuel.
but whatever its made of, its still giving you a cooler carb just by moving it away from the engine.
Beemer, did you bore the spacer out straight or use a taper?
but whatever its made of, its still giving you a cooler carb just by moving it away from the engine.
Beemer, did you bore the spacer out straight or use a taper?
Post Fiend
Joined: Dec 2003
Posts: 6,658
Likes: 4
From: "Islander"
spacer bore, my opinions
Ranchero77, that would be a straight bore that matched the throttle base plate. The "Adjustable Venturi Spacer" starts out with a bore of 1.690" that is .093" larger than the throttle base plate on a 670 Holley, turblence in my book vs the same bore as the carb. The largest insert is 1.400" at the bottom, that is 81% of the area or a 670 Holley, this makes the 670 into a 545 cfm carb. If you use the smaller inserts the restriction is worse. They stated "without significantly sacrificing performance", now thats a clue. If you have to use their product to get the engine to run correctly you have a bad combo between carb, intake and cam. To make "slight tune differences" a spacer would work. Carl.......o&o>...........
Senior User
Joined: Oct 2003
Posts: 347
Likes: 0
From: in a house
I don't think you should be looking at it as a restriction. in terms of volume I could agree but I think the benifits that are being sold by the company is the increase in air velocity by using the Venturi design in the spacer sleeves.
also the other claimed benifit on the correction of reversion or pulse changes in the vacuum signal I know to be but I don't know how significantly it effects performace. I could only guess that this would be a problem in the lower rpm's.
by having the venturi style sleeves below the idle circuit of the carb the entire incoming charge is effected so I can somewhat understand how the tapered sleeves help through out the rpm range. this is mainly why I asked if you ran staight or tapered holes which could confirm or deny the companies design.
also the other claimed benifit on the correction of reversion or pulse changes in the vacuum signal I know to be but I don't know how significantly it effects performace. I could only guess that this would be a problem in the lower rpm's.
by having the venturi style sleeves below the idle circuit of the carb the entire incoming charge is effected so I can somewhat understand how the tapered sleeves help through out the rpm range. this is mainly why I asked if you ran staight or tapered holes which could confirm or deny the companies design.
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