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Valley Engineering question

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Richard Pike

Joined: 09 Jan 2006
Posts: 1671
Location: Blountville, Tennessee

Posted: Sun May 28, 2006 6:45 pm Post subject: Valley Engineering question

Got a question for Rick Neilson: I have been impressed for years with 

Valley Engineering's ability to get great performance out of the VW, but 

every one of their airplanes has always been unmuffled/incredibly loud. 

Is there any way to make the thing work well and also be quiet? Is your 

MKIII quiet? I am tempted in the Valley Reduction/VW direction, but 

since my strip is right beside the subdivision, it is going to have to 

as quiet as a stock bug.



Realistic? Pipe dream? 75 pounds of muffler? No way?



Thanks

Richard Pike

MKIII N420P (420ldPoops)

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_________________
Richard Pike
Kolb MKIII N420P (420ldPoops)
Kingsport, TN 3TN0

Forgiving is tough, being forgiven is wonderful, and God's grace really is amazing.

biglar

Joined: 14 Jan 2006
Posts: 457

Posted: Sun May 28, 2006 7:04 pm Post subject: Valley Engineering question

While waiting for Rick to respond, I can say that even tho' Vamoose hasn't 

flown yet, the engine has been run quite a few times.  It has the dual 

exhaust system from Scat Engineering, and sounds like any other high 

performance street VW.  I can't prove this yet, but I do believe the prop 

makes as much or more noise than the exhaust.  I'm sure there are lighter 

systems out there that would work well, too.                        Lar.



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Larry Bourne
Palm Springs, CA
Building Kolb Mk IIIC
"Vamoose"

Thom Riddle

Joined: 10 Jan 2006
Posts: 1597
Location: Buffalo, NY, USA (9G0)

Posted: Mon May 29, 2006 4:44 am Post subject: Re: Valley Engineering question

Richard,



I know your question is about noisy VW engine exhaust but your question is of course applicable to all 4 stroke engines. 



I used to own and fly a Titan Tornado with 912UL engine. The builder of this airplane made his own exhaust system instead of buying Titan's ridiculously expensive and outrageously loud exhaust system. The Titan "system" was simply a 4-into-1 collector with no muffler at all and was notorious for its noise. The builder of my Tornado built a 4-into-1 collector with a short glass-pack style muffler of about 4" diameter and perhaps 10" long coming out of the collector. I'm guessing the muffler weighed maybe 3-5 lbs. My old Tornado was the quietest of any Tornado I've every heard. Bob Bean can vouch for this as I've done full power buzzes of his place just to see how noisy it was(n't).



Bottom line, no 4--stroke has to be loud and the weight penalty for a major noise reduction does not have to be that great.

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engine lft rear qrtr.jpg

Description:

Notice whole system sits above engine. Something like this might work for a VW.... don't know.

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Thom Riddle
Buffalo, NY (9G0)

Don't worry about old age... it doesn't last very long.
- Anonymous

NeilsenRM(at)comcast.net
Guest

Posted: Tue May 30, 2006 5:47 pm Post subject: Valley Engineering question

Richard



I have been out of touch for a week now, that's why I didn't respond till 

now.



I have a 4 into1 exhaust system that I think makes the exhaust noise fairly 

quiet with the prop noise being the major factor but I have never heard it 

fly bye. I did have a glass packed motorcycle muffler on it at one time and 

it cut the power way too much and didn't help the noise much. I will just 

have to get my plane down to the Kolb Homecoming so that you can hear it and 

make your own decision. The Valley guys tend to run with four short exhaust 

stacks and that does make allot of noise but they do perform. I think the 4 

to 1 produces more power if it is done right. I bought a dune buggy system 

that I cut and welded up to fit being careful to not change the pipe lengths 

much. I still have the baffled muffler that came with the original system 

that I would be happy to donate to your project. It was just too heavy for 

my tastes.



Rick Neilsen

Redrive VW powered MKIIIc



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Richard Pike

Joined: 09 Jan 2006
Posts: 1671
Location: Blountville, Tennessee

Posted: Tue May 30, 2006 6:13 pm Post subject: Valley Engineering question

Richard & Martha Neilsen wrote:

 	  Quote: 	
		   



 Richard



 I have been out of touch for a week now, that's why I didn't respond till 

 now.



 I have a 4 into1 exhaust system that I think makes the exhaust noise fairly 

 quiet with the prop noise being the major factor but I have never heard it 

 fly bye. <snip>



 Rick Neilsen

 Redrive VW powered MKIIIc

   

Thanks for the info. When the 582 comes up for overhaul, I may just switch.
	




Richard Pike

MKIII N420P (420ldPoops)



do not archive

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_________________
Richard Pike
Kolb MKIII N420P (420ldPoops)
Kingsport, TN 3TN0

Forgiving is tough, being forgiven is wonderful, and God's grace really is amazing.

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