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Old 09-24-2013, 06:40 AM
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Quote:
Originally Posted by BearBow View Post
My new VVRC Twin 40 just arrived but I have a muffler issue. Both of the mufflers casting of the mount face plate area is Not flat. They actually "rock" like a see-saw across the face of the exhaust port
I doubt the gasket will seal the port at all.
Anyone else with this issue? How'd you fix it?
I could run a flat bastard file across it I guess. But not impressed with that necessity.
Its odd, because the machining of the rest of theotor appears first class!
Ideas?

A flat file or sandpaper glued to a flat surface will fix it in about 5 minutes. I usually do this to any engine/muffler to ensure a good seal anyway. High temp copper rtv and no gasket and I never have leaky mufflers.
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Old 09-24-2013, 06:59 AM
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I give the flat bastard treatment to all my mufflers especially the ones from China
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Old 09-24-2013, 07:42 AM
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Quote:
Originally Posted by BearBow View Post
My new VVRC Twin 40 just arrived but I have a muffler issue. Both of the mufflers casting of the mount face plate area is Not flat. They actually "rock" like a see-saw across the face of the exhaust port
I doubt the gasket will seal the port at all.
Anyone else with this issue? How'd you fix it?
I could run a flat bastard file across it I guess. But not impressed with that necessity.
Its odd, because the machining of the rest of theotor appears first class!
Ideas?
File it down and ditch the gaskets. Use RTV and you will be just fine. Sometimes small adjustments are part of the hobby. If it is something you can't live with, send the mufflers back and get new ones.
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Old 09-24-2013, 08:05 AM
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Quote:
Originally Posted by Jaybird View Post
A flat file or sandpaper glued to a flat surface will fix it in about 5 minutes. I usually do this to any engine/muffler to ensure a good seal anyway. High temp copper rtv and no gasket and I never have leaky mufflers.
+1 for sticky back sandpaper method.

I still can't believe how this engine yanked around Supa Tim's plane at Wenatchee!! That thing was a little beast!
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Old 09-24-2013, 08:21 AM
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how does this engine differ from the RCGF 40 twin?
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Old 09-24-2013, 08:28 AM
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Originally Posted by TimBle View Post
how does this engine differ from the RCGF 40 twin?
To start the VVRC is about 20oz lighter and $90 less. The RCGF is wider too so it won't fit in as many planes.
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Old 09-24-2013, 09:38 AM
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ok you got my attention...
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Old 09-25-2013, 06:34 PM
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For those 1/4 32 spark plugs, are the little coil springs that go into the spark plug caps necessary? Is anyone using them?
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Old 09-26-2013, 03:07 PM
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As I understand it the NGK CM-6 version now has an angled plug. The overall with is down to 8-1/2" from the cap to the cap. Does anyone have a photo of this? I am hoping this will fit in a EF 78.
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Old 09-26-2013, 03:48 PM
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Does anyone have a photo of this? I am hoping this will fit in a EF 78.
This is a pic of a friend's new one with the CM-6 plugs. I asked him to measure the total width for me.
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Old 09-26-2013, 03:54 PM
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This is a pic of a friend's new one with the CM-6 plugs. I asked him to measure the total width for me.
Is that a Pilot-RC 26% Yak 54? If so I was wondering if the VVRC 40cc Twin would fit.
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Old 09-26-2013, 04:00 PM
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Yes, it had the small plug version in it before Matt sold it to Joe, without the engine. Now Joe bought the large plug version, and he is not quite finished. I'm just pissed this engine was not available before I sold my EF 78 Extra to Daren, because from what I have seen with Matt's, it runs great.
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Last edited by ghoffman; 09-26-2013 at 04:18 PM.
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Old 09-26-2013, 04:16 PM
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Wow! Thanks for the photos. It sure seems like the regular plug version would be a close fit in the EF 78. I might have to trim the cowl just enough to keep the plug wire from rubbing, but they surely would not stick out much.
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Old 09-26-2013, 04:38 PM
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Originally Posted by ghoffman View Post
Yes, it had the small plug version in it before Matt sold it to Joe, without the engine. Now Joe bought the large plug version, and he is not quite finished. I'm just pissed this engine was not available before I sold my EF 78 Extra to Daren, because from what I have seen with Matt's, it runs great.
How well did the yak perform with the VVRC 40cc? The 26% Pilot-RC Yak 54 and the VVRC 40cc twin is a combination I'm considering or the 78" EF Extra 300.
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Old 09-26-2013, 04:45 PM
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The engine pulled the Yak around great, but honestly the EF Extra is a much better plane.
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