Q-40 Racing Discuss AMA 422 and any other variants of Quarter 40 racing

Nelson Long stroke muffler on a short stroke Q40 motor

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Old 06-30-2010, 11:51 PM
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AllanU
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Default Nelson Long stroke muffler on a short stroke Q40 motor

I have been running Nelson short stroke in Q40 and have heard that you can get increased performance out of a short stroke by running the long stroke muffler and prop the motor like a long stroke (7.4 x 7.5). I hear it provides slightly better power than the normal short stroke, but below what the long stroke puts out. Has anyone comments on this or tried it?

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Old 07-01-2010, 03:33 PM
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Default RE: Nelson Long stroke muffler on a short stroke Q40 motor

It helps, but use a 7.4x7.7
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Old 07-01-2010, 03:46 PM
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Default RE: Nelson Long stroke muffler on a short stroke Q40 motor

Eddie - in this this pea soup we call air in Kansas, what would be a decent prop for a SS Q40 with SS muffler?

Seems like I have one now..

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Old 07-01-2010, 08:49 PM
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Default RE: Nelson Long stroke muffler on a short stroke Q40 motor

7.4x8.0 is what i've been using
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Old 07-01-2010, 09:16 PM
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daven
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Default RE: Nelson Long stroke muffler on a short stroke Q40 motor

I always liked the 7.4 x 7.8 with the short stroke, but they do vary, so you try several.
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Old 07-01-2010, 10:11 PM
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Default RE: Nelson Long stroke muffler on a short stroke Q40 motor

I'm with Dave on this one, I had better luck with the 7.8. I think Paul's SS is stronger that the one I run with a SS muffler.
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Old 07-17-2010, 11:41 PM
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Randy Smith
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Default RE: Nelson Long stroke muffler on a short stroke Q40 motor

Hi Al,
Ted Ellefson was running the LS muffler on the SS Nelson just today at the field. It seemed to be running well. He was running a 7.4 x 7.6 prop but we told him to go to the standard 7.4 x 7.8 SS prop.
I think it will perform better. It's worth a try. You should try it in Calgary at our races.


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