What size tuned pipe for a .61? - RC Groups
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May 12, 2011, 12:30 AM
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cannondale1974's Avatar

What size tuned pipe for a .61?

Looks like Macs gives me a couple choices, an 8.5cc for 45-60 size motors and a 10cc for 60-75 motors. I'll probably end up with an OS .61 which size tuned pipe would be the best or does it really matter?

Here's the chart from Macs website. http://www.macspro.com/tunedpipes.asp

Thanks guys.
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May 12, 2011, 06:07 AM
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1 cc equals .061 cubic inches. You have a 10 cc engine so use the 10 cc pipe. I have used Macs products for years and have had zero quality issues.
May 12, 2011, 11:49 PM
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downunder's Avatar
The sizes listed are simply the engine size in both metric (cc) and Imperial (cub inch). Personally I'd just go for the stock #1060 Quiet pipe but remember you have to also get an exhaust header as well.
May 13, 2011, 12:01 AM
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cannondale1974's Avatar
Thanks guys, I've used tuned pipes for years and currently have an OS .32 on a tuned pipe. My local hobby shop has a Macs pipe on the shelf for an 8.5cc so it's a little confusing since their website says both the 8.6 and 10cc will work on a .60 I may give them a call and get their input as well.


ps: I don't want a quiet pipe, I want to hear this thing.

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