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Original Message
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| RE: carb. spacer. |
| By Gerry Proctor - 03/29/2004 8:27:12 AM; IP 207.133.188.254 |
Once you have about 1/4" of insulation you don't gain significantly more heat isolation by going thicker. There is no "one size fits all" when it comes to spacers. There are generally predicted outcomes for different spacer types but these are not absolute.
Generally, a closed spacer -where each venturi maintains a separate hole in the spacer- will improve signal to the carburetor since this spacer type lengthens the carburetor's runner and tends to improve the low rpm response. An open spacer -where all of the carburetor's venturi are open to the spacer- increase the plenum area and tend to increase the higher-end horsepower. A spacer where there is a vacuum channel between the holes doesn't make it an open spacer. It's still an isolated spacer.
Stacking spacers adds either runner length or plenum volume but there is no guaranteed outcome when you do this.
Spacers are good tuning devices and since there is no guaranteed outcome, you should treat them as tuning devices. You just have to try them and see if what happens is what you want. |
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