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Thumper......What qualifies? (Read 240 times)
Dave
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Thumper......What qualifies?
10/07/14 at 06:20:42
A few days ago someone posted about a 250 Thumper chopper. Now I am beginning to wonder.....at what point does a single cylinder bike qualify as a 'Thumper"?
Personally I have applied the Thumper term to a 500cc and above singles - but not for anything smaller....and never for a 2 stroke bike. Maico used to make a 501cc single cylinder 2 stroke....and it made a "Braaaap" sound....never "Thump....Thump....Thump".
Does a 100cc bike that makes "Putt....putt....putt.....putt" sounds quailfy as a Thumper????? I think not!
What are the rules of conduct? How should be behave?
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thumperclone
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Re: Thumper......What qualifies?
Reply #1 -
10/07/14 at 07:31:23
any single cylinder 4 stroke motorcycle
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justin_o_guy2
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Re: Thumper......What qualifies?
Reply #2 -
10/07/14 at 07:47:17
Nah,I'm with Dave, at some point the term no longer applies. If I was gonna get serious about it,stroke length and RPM would probably be part of the equation, but if an engine isn't big enough,single or no,Snot a thumper.
AND,TC,no matter how many times you say it is won't Chaaaangemymind,,,,
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Re: Thumper......What qualifies?
Reply #3 -
10/07/14 at 07:47:35
I would say certainly down to about 175-250cc. Really about any displacement where one starts to have the option of choosing a multi-cylinder engine. Maybe the threshold is relative. Back in the '70's or '80's, I think Honda had a 175cc twin and a 175cc single. At that point, I think the single qualified as a thumper.
500cc is a little high for qualification. My BSA 440 was certainly a thumper compared to other bikes of the era.
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justin_o_guy2
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Re: Thumper......What qualifies?
Reply #4 -
10/07/14 at 07:49:17
Should torque be a factor?
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bobert_FSO
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Re: Thumper......What qualifies?
Reply #5 -
10/07/14 at 07:50:20
Dave, if you watch the crankshaft in your video, that engine is some kind of two-stroke. It looks and sounds to be firing on every crank revolution. It's also possible it is a two-cylinder.
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Dave
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Re: Thumper......What qualifies?
Reply #6 -
10/07/14 at 08:21:46
bobert_FSO wrote
on 10/07/14 at 07:50:20:
Dave, if you watch the crankshaft in your video, that engine is some kind of two-stroke. It looks and sounds to be firing on every crank revolution. It's also possible it is a two-cylinder.
Yea, that is certainly possible. Some of the big engines were two stokes. The Reid engines were 2 strokes and used a charging cylinder to pull natural gas from the oil wells, and use that for the fuel to run the engines.
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Dave
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Re: Thumper......What qualifies?
Reply #7 -
10/07/14 at 08:29:27
justin_o_guy2 wrote
on 10/07/14 at 07:49:17:
Should torque be a factor?
To me....the exhaust note is the issue. Thumpers got the name from the sound they make . When big singles are idling they go Thump....Thump....Thump....and even when accelerating they just bunch the "Thumps" up closer together.
When the engine is so small it no longer "Thumps".....then it ceases to be a Thumper. Things that go "Putt"....."Pop"......"Tutt" might not qualify...and when the Thump turns into a steady Buzzzzzzz at speed???????.
And Yes....a 440 Victor certainly would qualify as a Thumper.
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stewmills
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Re: Thumper......What qualifies?
Reply #8 -
10/07/14 at 08:37:43
Maybe we should come up with an equation using several factors:
T
= torque
V
= volume (cc)
Db
= Decibels
F
= Frequency (of the thump, thump, thump)
((
T
)x(
V
)+
Db
)) /
F
is >/= X (
must be greater than or equal to X)
Now what X is, I have no clue because I don't know what the stock values would be for the above variables but I'm sure one of you wise guys will solve the equation here shortly
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Re: Thumper......What qualifies?
Reply #9 -
10/07/14 at 09:18:46
Too complicated...
I call any 4-stroke single, a thumper,... any over 400cc,... a big thumper...
JMHO...
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stewmills
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Re: Thumper......What qualifies?
Reply #10 -
10/07/14 at 09:30:12
I'm just teasin'. Still waiting on someone to try and figure it out though
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Dave
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Re: Thumper......What qualifies?
Reply #11 -
10/07/14 at 09:59:30
I posted this just for a bit of fun...on a rainy day.
I really didn't expect to come up with an empirical equation to define the Thumper.
The weird thing is that just about every single motorcycle idles at about the same speed - but the tone of their voice sure changes with the engine size.
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justin_o_guy2
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Re: Thumper......What qualifies?
Reply #12 -
10/07/14 at 10:09:59
stewmills wrote
on 10/07/14 at 08:37:43:
Maybe we should come up with an equation using several factors:
T
= torque
V
= volume (cc)
Db
= Decibels
F
= Frequency (of the thump, thump, thump)
((
T
)x(
V
)+
Db
)) /
F
is >/= X (
must be greater than or equal to X)
Now what X is, I have no clue because I don't know what the stock values would be for the above variables but I'm sure one of you wise guys will solve the equation here shortly
Man, I gave up huntin for "X" in Algebra.. Now, if you want me to go looking for "X", you gotta hand me a treasure map.
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Greg
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Re: Thumper......What qualifies?
Reply #13 -
10/07/14 at 10:32:24
There are currently 125cc twins available overseas. I like the idea of where an additional cylinder is added as being the cut off. In my mind, that would be 125cc and higher. A 4 stroke is a must as well.
bobert_FSO wrote
on 10/07/14 at 07:47:35:
I would say certainly down to about 175-250cc. Really about any displacement where one starts to have the option of choosing a multi-cylinder engine. Maybe the threshold is relative. Back in the '70's or '80's, I think Honda had a 175cc twin and a 175cc single. At that point, I think the single qualified as a thumper.
500cc is a little high for qualification. My BSA 440 was certainly a thumper compared to other bikes of the era.
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Dave
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Re: Thumper......What qualifies?
Reply #14 -
10/07/14 at 10:39:05
Good thing we aren't accepting 2 strokes....then the discussion would have to include the Twingle! A Single combustion chamber and spark plug, on a single crankshaft bearing.....that has two pistons and connecting rods.
http://en.wikipedia.org/wiki/Split-single
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