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#1
11-06-2009, 01:54 PM
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What's with all the noise?
The thread on the Vulcan cam chain noise spurred my memory about the different noises that emanate from the engine of a motorcycle. About five years ago, while doing numerous back to back dyno runs with our AHRMA Enfield, we placed an exhaust hose on the single outlet megaphone, cinched it up and connected it to the receptacle in the garage wall (made for car exhaust in winter). Anyway, with the exhaust completely carried outside beyond our earshot, the noises coming from the little 500cc push-rod single was very entertaining. The valves tick away in a rhythmic syncopation that rise and fall with the throttle, the carb hisses and gasps then growls at open throttle. The primary chain clinks and clatters, the oil pump putters and whirs and the combustion event puts out a very dull and feint thudding (like drum sticks on a pillow). There was only a very slight rumble from the exhaust hose. No ringing of the cylinder fins was perceptible to us either.
Later in the week, we had a vintage 250cc Kawasaki flat tracker on the dyno and hooked up the hose on it...Wow! A persistent ringing was coming from those fins and the combustion sounded like a deck of cards being shuffled like when you separate them with your thumbs against the table...The expansion chamber clicked and thudded and with a bit of revs, it just hummed. The carb buzzed from the reed valve and also growled when you cracked the throttle. Very cool for a curious mind such as mine indeed. I highly recommend it to any who are curious what their bike sounds like sans exhaust note. This brings me to this observation; I like the idea of electric motorcycles but the lack of sound would really suck! Why do we revel in the racket that our bikes make? I'll bet the exhaust note is one of the single most enjoyable factors to motorcyclist...No? BTW, the RE made 42.5 hp at the wheel and the Kaw made 28.7...I knew some one would ask.  RE on Dayton Dyno.  Alan Jacobs Vintage Tracker
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Three R's___ Readin, Writin & Racin! Last edited by mrwzrd59; 11-06-2009 at 02:10 PM. 
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#2
11-06-2009, 01:58 PM
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April, 1972, I rode my R60 from L.A. to StL. Somewhere in NM, I began to be aware of all kinds of sounds and to worry if somehow I'd lost oil or oil pressure. Turned out I was just in that zone.
I notice that with my new helmet I hear more of Neville's valve-train whirring. Has me wondering if there could be some way of soundproofing the cam cover.
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http://www.youtube.com/watch?v=hULpiDh8F8Y < Ride Angeles Crest Highway with Fid "If you have a talent, it's a gift from God; If you use it, it's a gift to God." - Red Skelton
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#4
11-06-2009, 02:18 PM
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The little RE that could.
Quote:
That little RE won the AHRMA national champ spot in classic sixties in 2003. I think it was a first for any RE, EVER.  Johnny Szoldrak up.
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Three R's___ Readin, Writin & Racin! Last edited by mrwzrd59; 11-06-2009 at 02:23 PM.
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#5
11-06-2009, 03:07 PM
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42 hp from an Enfield?!?!?
Ok, if I've read your previous posts right you used to be a dealer, and now you aren't. I would think you'd be able to sell as many of those little retro firecrackers as you cpould wrench together. Must be a really good story there.......
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The foward progress of technology is highly overrated.
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#6
11-06-2009, 03:52 PM
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And so the story goes...
Quote:
My input was designer, machinist and partner in the repair shop by association. I messed with a whole bunch of early RE's. I saw all of the warts and goofy guys who came through the door. I don't even own an Enfield. The shop was my home away from home for several years and had loads of fun as complete underdogs! "Humble and lovable, thank you sir". All of the trick bits on our racers were my handi-work. Lots an lots of titanium, aluminum and completely one of a kind bits. The bike started out as a turd and when I was done, it weighed 267 lbs. and made 42.5 hp at the wheel on our own dyno (that we still have). Glen Kyle, four time national hill-climb champ built the motors. All the peripherals are mine. Too much time on our hands but boy did we have some fun!
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Three R's___ Readin, Writin & Racin!
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#8
11-07-2009, 01:20 AM
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Quote:
Mark went through a shocking and nasty divorce that had cleaned out his cash savings but left him as a renewed bachelor messing with bikes and cars for fun. His day job was appraising homes and now without the use of his legs, he cant do that very effectively any more. Mark is a "known and credentialed" fast bike pilot at Bonneville, Maxton and the Texas mile on a turbo Hyabusa and has gone over 240 mph. Mark is also a refined and subdued "Texas gentleman" and is a pleasure to know and have as a friend. We all wish him well. The proceeds from our DVD go to his benefit so if you have an interest, pick one up. Thanks for asking.
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Three R's___ Readin, Writin & Racin!
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#9
11-07-2009, 07:51 AM
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Almost twice the HP of a stocker. Scary fast. I'd like to see a couple straight on side shots if you have any. I'm also curious about fork and suspension mods. Oh- and where the tank came from.
Have to say- if I ws going for speed, I'd get a girl to ride. That guy looks pretty big. I would love to hear a conversation with you and AceCafe on the RE forum. He loves to monkey around with his engine, but I'm not sure how sound some of his ideas are. Like he was discussing velocity stack length and how it efects tuning, whereas someone else I know (and I think you do too) says that it doesn't really matter that much, but length between the carb and head does. It's all over my head, of course. I think a stack for everyday use is nuts, though.
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Secret message;
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#10
11-07-2009, 11:08 PM
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Quote:
like a sexy girl with tattoos, motorcycle boots and a cigarrette hanging out of her mouth
__________________
The foward progress of technology is highly overrated.
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