Whats your best guess?

[flywheel]

Study the attached pix of this china single (rufa brand zs1110 direct injection) and 10kw st head.   Which will produce more power - direct driven at 1800 rpm or belt driven at about 1985 rpm.  I did the testing both ways so I know for sure which one is best.  Whats your best guess on which one produces more power?  I will submit the answer when there are no more guesses coming in.  flywheel

[mobile_bob]

well if we accept the common logic, the direct drive should produce more power, but
in my experience the belt drive is not that much less, and in some cases produces a bit more power.

i look forward to your "real world" results on this one.

when your done, maybe we oughta petition to move this to the testing/procedure/protocol section
especially if the belts are shown to produce more power.

getting a collection of "real world" test results all in one place is going to be very useful as time goes along in my opinion.

BTW flywheel,, thats one purdy genset you got there!

john deere would be proud of that puppy, or at least they sure ought to be.

bob g

[veggie]

My guess is that the direct drive will be slightly more efficient than the belted unit (drive losses).
Overall, it may not be enough to make a difference.
For simplicity of alignment and fabrication, I chose the belt drive route.
Have a look...

http://www.youtube.com/watch?v=OadQC66XZZk

Nice looking units you built. On my co-gen unit, I too chose the John Deer green.
Gives it that rugged, heavy duty look.

PS: Looks like someone's getting ready for hurricane season ??

Cheers,
Veggie

[veggie]

From the pictures, it looks like the belt drive unit is running a 1:1 drive ratio.
So...both version might be running at 1800 rpm ??

Veggie

[veggie]

Ahhh! I see that !
Your point about the output comparison is valid. The two cannot be properly compared as stated above.
Fuel consumption per Kw is the best way.

Veggie

[mobile_bob]

perhaps "flywheels" original intent was to start some discussion on a new forum that would be seen
as relatively safe and benign, rather than a indepth technical discussion on the merits of one drive over
another?

thats the way i took it anyway

bob g

[cujet]

I'll guess the belt drive at 1900+ RPM makes more juice.

[veggie]

My vote.....the Belt drive unit with the engine at 1985 rpm makes the most kw's.
Why?: I don't think the belt drive losses will totally offset the power gained by running the engine 185 rpm faster.

Veggie

[Henry W]

My vote would be belt drive. Reason is like others said.

Henry

[panaceabeachbum]

My vote.....the Belt drive unit with the engine at 1985 rpm makes the most kw's.

My vote also

[cognos]

I'll bet they are both exactly the same, or very, very close:

Power output of 10% less-efficient belt drive@1985 RPM = Power Output of more efficient direct drive@1800 RPM

[Shipo]

I also vote for the belt...you can increase the rpm to compensate the lost in the belt

[Henry W]

Im ready for the answer. How much longer will we have to wait

[vdubnut62]

I vote for direct drive!
Ron

[veggie]

Im ready for the answer. How much longer will we have to wait

I can't sleep.....tell us....tell us!

Veggie