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What about carb. spacers? I run a single plane. Would a

spacer increase atomization without compromising...
What about carb. spacers? I run a single plane. Would a spacer increase atomization without compromising the fast delivery of a short run intake? Perhaps you could contrast short and long runner intakes, whether dual or single plane.
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Answered in 37 minutes by:
11/9/2011
Dr. Hamman
Dr. Hamman, Technician
Category: Classic Car
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DR. Hamman :

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The optimal runner length, shape, and size can vary drastically, with other engine types and components. Variables like cams, port design, engine displacement and more factor in. IR (individual runner) single plane, and dual plane induction setups have different characteristics. It is a pretty deep subject, with lots of theory, and theory is good, but the ultimate truth comes from running an engine on a dyno. I have seen engines that would pick up 40HP on a dyno pull with a spacer under the carb. I have also seen engines that would loose power with a spacer. The trend is single plane intakes normally respond better to spacers, but there are no absolutes here. The efficiency of different intake designs can also vary significantly at engine different speeds, on different engines. Any time design characteristics are planed, or calculated it is always an educated guess. The actual outcome can be unexpected, even though you follow a pattern that was thought to be predictable. Like I said ultimate truth comes from running an engine on a dyno. You can use the drag strip as opposed to a dyno, if you want a simple solution to determine if a spacer works for your engine. You should see the changes in the ET, and MPH on the dragstrip runs. Lots of fun, and less expense than a formal dyno run. If you have any more questions I am here to help. Good luck, and Thanks for using Just Answer.

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DR. Hamman :

I wanted to add: Long straight runners favor higher rpms, runners like a dual plane favor lower rpm's, and short runners from my experience are the most unpredictable, as far as trying them on an engine that wasn’t factory equipped with them. Some engines like the LT1 second generation small block Chevy used short runners with great success. They produced good power and fuel economy in stock form.

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