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Old 05-10-2004, 03:56   #1 (permalink)
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Carby Spacers on Single plane manifolds

My brother has an XY (351 Clevo) and is just about to spend a shitload on engine and was wondering what the effects of a 1 or 2 inch carby spacer would have on a single plane manifold like the Parker Racing FunnelWeb 3

Help appreciated
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Old 05-10-2004, 04:17   #2 (permalink)
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Re: Carby Spacers on Single plane manifolds

Spacers are good for increasing the air speed. I have a Single Plane Manifold on my Cleveland with a 2" Spacer.
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Old 05-10-2004, 04:29   #3 (permalink)
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Re: Carby Spacers on Single plane manifolds

I've seen dyno results make a significant improvement on HP and TQ by fitting a carb spacer.....significant with reference to the cost of a spacer. Engine I'm recalling had a smaller manifold like a weiand xcelerator and medium size solid cam and other basic go fast bits. 2 inch, 4 hole spacer gave it about and extra 20HP & ft/lbs TQ.

I recall the funnelweb sits quite high and an extra 1-2" may give you clearance issues - easy fixed with an angle grinder to the bonnet!

It all really depends on how your brother's engine is set up already. Cam, heads, headwork, exhaust, carby etc. Don't expect eye watering results with a spacer - one of those things you fit and try a dyno run to confirm results (1", 2", open or 4 hole).

If you fit one, don't use a metal/aluminium one. Use a plastic/composite type - spacers also act as an insulator to keep your carby and fuel cooler for a denser charge adding to your power.
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Old 05-10-2004, 06:32   #4 (permalink)
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Re: Carby Spacers on Single plane manifolds

From what i understand, a spacer just gives more room from carby to the plenum in the manifold. This is so the air/fuel can leave the carby and travel down, then turn easier into the runners, instead of at a short 90 degree turn.
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Old 05-11-2004, 00:05   #5 (permalink)
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Re: Carby Spacers on Single plane manifolds

why can't you use aluminium spacers?
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Old 05-11-2004, 00:12   #6 (permalink)
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Re: Carby Spacers on Single plane manifolds

I use alloy spacers with no problems. I guess composite ones provide better insualtion from heat but I have never let it worry me.
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Old 05-11-2004, 00:15   #7 (permalink)
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Re: Carby Spacers on Single plane manifolds

They hold the heat unlike the Barry Grant Bakerlite ones which keep the heat away to a certain extent.
The alloy ones will still work well, but why not buy the best, only a few bucks in it.
They are designed for more air speed, so when it does hit the bottom of the manifold it gets pushed harder into the heads and through the valves.
Spacers are an extremely worth while exercise, should see another 5-10hp at the wheels.
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Old 05-11-2004, 00:30   #8 (permalink)
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Re: Carby Spacers on Single plane manifolds

Is there any reason why you wouldn't use one on an LPG throttle body?
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Old 05-11-2004, 00:36   #9 (permalink)
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Re: Carby Spacers on Single plane manifolds

Is there any reason why you wouldn't use one on an LPG throttle body?
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Old 05-11-2004, 03:51   #10 (permalink)
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Re: Carby Spacers on Single plane manifolds

Quote:
Originally Posted by TICK4D
They hold the heat unlike the Barry Grant Bakerlite ones which keep the heat away to a certain extent.
The alloy ones will still work well, but why not buy the best, only a few bucks in it.
They are designed for more air speed, so when it does hit the bottom of the manifold it gets pushed harder into the heads and through the valves.
Spacers are an extremely worth while exercise, should see another 5-10hp at the wheels.
Heat is still transfered through the bolts.
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