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Carb Spacers..advantage?

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Mopower

04-06-2004 08:28:36

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What is the advantage/disadvantage of spacing a carburetor away from the manifold. I noticed I have a spacer on my G engine between the carb and manifold that is not on my U (MM). Probably just for tall blocks and linkage reasons, but is there an advantage? I see spacers for 4-barrels on trucks claiming an advantage. Never had an explanation. What's the theory gearheads?

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Greengo

04-06-2004 23:42:29

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Re: Carb Spacers..advantage? in reply to Mopower, 04-06-2004 08:28:36

It tricks the engine into thinking it has a bigger carburetor, An old drag racing trick.
On my 69 Camaro it picked up about 3 tenths
of a second in the quarter mile, doesn't
sound like much but to a drag racer it is alot.

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Mopower

04-07-2004 08:42:16

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Re: Re: Carb Spacers..advantage? in reply to Greengo, 04-06-2004 23:42:29

Could you tell me the physics behind how it "tricks" the engine? Really interested in how it does this and what is happining in there.

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TimC

04-07-2004 18:30:16

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Re: Re: Re: Carb Spacers..advantage? in reply to Mopower, 04-07-2004 08:42:16

IMHO it doesn't do any tricks in that reguard. Imagine wet fuel and air rushing out of the carb down into the plenum. Then it gets snatched toward a port by the huge vacume created by the piston. What happens? The air always takes the shortest path. Imangine a car load of people in a big buick electra 225. You are following behind them and the driver snatches the wheel to the right. The car is the air. All six or eight of the heads you see thru the rear window is like the gas. The heads don't make the turn as well and they all get slammed to the left.

Adding a spacer changed the flow path reducing the angle and less fuel is slung to the floor of the plenum. Better atomization means better fuel burn. Able to run higher compression. All this means more power.

Ever heard of the "TURTLE", it was used in the plenum (I think originally with nascar and dodge in production) which directed flow and broke apart the large droplets that would puddle in the plenum.

That is what I think is the real skinny on spacer plates.

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Mopower

04-08-2004 14:17:15

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Re: Re: Re: Re: Carb Spacers..advantage? in reply to TimC, 04-07-2004 18:30:16

Makes sence to me. I see some manifolds with an open manifold hole under the four barrel and some with a divided hole..... and some semi-divided types. Similar reason? Thanks for the info sir.

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TimC

04-08-2004 18:31:44

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Re: Re: Re: Re: Re: Carb Spacers..advantage? in reply to Mopower, 04-08-2004 14:17:15

Single plane manifolds have a large plenum area for higher flow capibilities. The large demands at high rpms requires enough for the cyls to call on. It is also a shorter distance from the valve face to the atmosphere. Thats where the rpms range and short timing for the pressures waves come into play.

Dual plane manifolds help with ram tuning (the high velocity channeled in a long slim runner has the weight and kenetic energy to force the cyls full) and less area is required for effeciency. Also the length is longer providing the proper timing for the pressure waves to reflect back and forth and end up hitting the valve just before the IVC event.

Modified dual plans have a gap between the seperate plans to satisfy the occasional needs for more flow.

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TimC

04-06-2004 09:00:06

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Re: Carb Spacers..advantage? in reply to Mopower, 04-06-2004 08:28:36

It increases the torque on most applications. It insulates the carb some what. It adds more plenium space so the cyls can draw from more volume. It increases the lenght from the face of the valve to the outside world changing the rpm range where peak torque will fall. Its sort of a harmonic factor. Like when dodge produced the cross ram intake. That brought the low end torque up dramatically. If you notice most new vehicles with fuel injection the intakes roll over from one side to the other to take advantage of lengthening the runners and keeping it all under the hood.

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04-06-2004 08:46:34

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Re: Carb Spacers..advantage? in reply to Mopower, 04-06-2004 08:28:36

In trucks its susposed to have a "helix bore" that spins the incoming air

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