[Land-speed] Cam Belt-Drives

[drmayf]

Resent...stupid trailer at the end.....

m

Sorry, I am not buying it.  Why, you may ask? Well, he provides
absolutley no data, no methodology to test  or anything other than trust
me. Just because he says  it is so.  Well, he has to show me the math
and physics involved.  He talks of no torsional inputs from the prop,
but looking at his cowling arrangement shows me that's baloney. Every
time a blade half goes from the horizintal and passing below the
radiator it has a torsioan; input that is different that the rest of the
propeller arc.  And teh belt is way more than just a coupling stiffness
mechanism. How's that? well the teeth on the belt are teh shock
absorbers which give to reduce the harmonics.   It is kind of like a
rubber torsional coupling for a boat or anything that needs drive shaft
shock absorbing, just on a smaller basis but more of them.  In teh case
of a ICE th eidea is to reduce crank harmonics and preven them from
getting into the cam causing valve train  errors. Not to mention spark
timing issues. So I am still on board with cam drive belt systems. Just
wish I could afford one, lol...

But I like his motor! That is the one on my Turbo Sprint! A screaming
993 cc of turbo terror......maybe......

mayf
Kirkwood wrote:

>Mayf's timely question has raised another issue. If one was to believe
>advertising you would think that a belt drive was a magic excelsior to
>dampen all the bad harmonics coupled to the cam. Not being an engineer it
>sounded like a plausible solution. However, as a technocrat suspicious of
>unsubstantiated advertising, I am always looking for good data proving the
>supposition. I am still neutral about belt drive claims. Testing and
>engineering analysis to prove belt-drive claims is non-trivial and
>expensive. In Experimental Aviation a belt-drive-prop-reduction-unit has
>always claimed, among other things, to be beneficial due to its dampening
>characteristics.  So, in absence of good data, it is refreshing to see an
>interesting article that appears to debunk the status quo. 
>
>http://www.eaa.org/experimenter/articles/2009-10_beltdrive.asp
>
> 
>
>Knowledge is horsepower. Too much is a good thing :-)
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