Different approach

fredful · Nov 24, 2012

Norton Dave said:
Excuse me Fredful FYO , but 1 cubic inch to cubic centermeters is cubic inches to cubic centermeters multiply 1 cu.inch x 16.38706cm3 so one cubic inch equals 16.38706 cm3. As for hp to drive a fixed displacement pump flow in US/Gallons x pressure in LBS/per square inch divided by 1714 =( HP = PSI X GPM DIVIDED BY 1714) do not forget pump loses and inefficiency gear pump would be about 75 percent efficient. Your formula states cubic inches to cubic centermeters factor .01639 ????? Norton Dave .

Thanks for your comments Dave my conversion factor is for cubic inches to litres not cubic centimeters the horse power calcs you mention is another way to reach the same result

Norton Dave · Nov 24, 2012

You are darn correct on the formula fred I did not have my glasses on shit showing my age now looking forward to you results thanks Dave .

bwolfie · Dec 16, 2012

How are the results of this fascinating machine work coming? I am eagerly anticipating a followup.

cjandme · Dec 17, 2012

+1, fredful--what gives ???

bwolfie said:
How are the results of this fascinating machine work coming? I am eagerly anticipating a followup.

swooshdave · Dec 17, 2012

comnoz said:
It could sure be easier than building a new pump except that I don't have a way to cut helical gears . Jim

Maybe Santa will bring you some new tools. :mrgreen:

Foxy · Dec 17, 2012

Good on ya Fredful, I applaud your efforts/calcs to date! I like the sound of Jims 40 psi at idle and wait with great interest for your results!

bwolfie · Mar 18, 2013

Any update on how the 8 start gear is working out?

pierodn · Mar 19, 2013

Hi,
I read very carefully trying to understand this topic very technical.
Please let me know if there are any differences between the oil pump of 750 and 850, and they have the same six start worm drive gear for the oil pump?.
Piero

drones76 · Mar 19, 2013

pierodn said:
Hi,
I read very carefully trying to understand this topic very technical.
Please let me know if there are any differences between the oil pump of 750 and 850, and they have the same six start worm drive gear for the oil pump?.
Piero

Piero,

The gear is the same part for the 750 as the 850.

bwolfie · Mar 19, 2013

The oil pumps are all the same, this thread is about making a gear that drives the pump faster. Just an experiment.

From what I understand, when the commando came out, they went from a 4 start gear to a 6 start gear. This experiment is with an 8 start gear.

Different approach

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