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  #871  
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Some pump gear data:
The pitch distance of 14 & 16 tooth pumps is not the same.
All driven and idler gears have .422" ID center holes
14 tooth gears (1952-61) are .970" OD
All feed gears are .217" thick
All return gears are .360" thick
16 tooth gears (1962-76, also all 45 & UL return pumps) are 1.115" OD
1962-71 feed are .185" thick
1962-71 return .375" thick
1972-76 return .398" thick
45 & UL 1937-73 return .315" thick

Inspect your spares and purchases carefully - 1936-* OHV BT gears are 14 tooth, but .990" OD and only the driven gears have .422" ID hole (the idlers are .342")
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  #872  
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Excellent information. Thank you!
I'll add this info to the IH oil pump page in the Sportsterpedia.
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When it rains, it pours.
I checked my swingarm bearings for fun and they gotta be replaced along with the races.
I'll make that another thread also.

Quote:
Originally Posted by bustert View Post
quarts???
any other units of measurements???
That information was posted by DD bustert. I have no other info than that on volume.
Wait, you gave some volume information in my deep dark closet of memory also.
I'll dig that up and include it also.
I'm starting to get behind...

Quote:
Originally Posted by stikflote View Post
quarts == 2 pints
Can't get anything past you..
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  #874  
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yea, i am used to the pints, had a few already.
not following the line of reasoning with liquid measure even if air is a liquid.
also, even though there is leakage when closed, the slot is open at down stroke.
7500 qts of liquid measure would be a tough sale through a 3/8" tube.
then there is law of averages and restriction.

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Air is a fluid, but not a liquid. 1 imperial pint = 568.26… cc³, 1 US (liquid) pint = 473.17… cc³
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Quote:
Originally Posted by bustert View Post
not following the line of reasoning with liquid measure even if air is a liquid.
also, even though there is leakage when closed, the slot is open at down stroke.
7500 qts of liquid measure would be a tough sale through a 3/8" tube.
then there is law of averages and reastriction.
I'm not completely following the math either.
As RPM increases, the time between strokes decreases and I didn't see that factored in.
Of course with the timed breathers, there shouldn't be any 'float' as is with umbrellas.
But 'float' is still there with the increasing speed of the slot opening and closing.

I think the volume figures are more theory than actual.
But it is an example way to follow the process.
Leakage when closed is probably akin to the tiny drain hole in the umbrella system.
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yea, sometimes the fingers type what they want.
one very important fact is the effects of pressure, that is why you can get 244cu/ft in an O2 bottle.
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Quote:
Originally Posted by bustert View Post
yea, sometimes the fingers type what they want.
one very important fact is the effects of pressure, that is why you can get 244cu/ft in an O2 bottle.
It mostly depends on temperature and pressure.
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you really cannot go by swept area either, toooo broad a band.
to be accurate to within reason with paper and pencil you would have to calculate it by degree of rotation (dynamic)
swept volume and case volume are way diff. one being is one is closed off.
a ?
what was the original concept for the PCV system????
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Quote:
Originally Posted by bustert View Post
what was the original concept for the PCV system????
Positive - Crankcase Ventilation.

The rotary breather valve functions to relieve pressure in the crankcase caused by the downstroke of the pistons and it controls the flow of oil in the lubrication system.
It is timed to open on the downstroke of the pistons.
This allows crankcase exhaust air pressure to expel the scavenge oil from the crankcase breather oil trap into the gearcase.
The breather valve then closes on piston upstroke, creating vacuum in the crankcase.
Crankcase exhaust air from the gearcase is sent out the breather tube.
Any oil still in suspension with the air on the way to the breather tube is separated by an oil slinger on the generator drive gear.
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