Oil Pressure Experiments - 2009 KLR650 - Page 3 - Kawasaki KLR 650 Forum
2008+ KLR650 Wrenching & Mod Questions For repair, maintaining or modifying discussions related to the newly updated 2008 and beyond, Generation 2 KLR650 Motorcycle.

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post #21 of 471 Old 08-21-2014, 07:12 PM
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Please PM if I don't find your new thread, Tom.

Paul is remarkably tolerant of tangents from his threads but I agree that this is muddying the waters.

A problem in calculating clearance flow is that boundary layer flow considerations interfere. Playing around with an oil pump, it seemed that the flow from main bearing clearances was less than that expected by simply calculating area of bearing cross section minus area of shaft cross section, and factored by the length of the passage. It really begins to "get out there".



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Originally Posted by Tom Schmitz View Post
Yes, I am trying to keep it within my means and bounds.

Really should get my own thread and quit mucking up Paul's.

I also realize I mis-spoke regarding calculating the orifice to simulate the bearings. It is not the annular area of the bearing, it's the area of a cylinder that is half the bearing clearance with the diameter of the oil feed, times the number of oil feeds.

This is going to be interesting. I think.

Tom
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post #22 of 471 Old 08-21-2014, 07:16 PM
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Very true, but I think I'm not after absolute flow numbers that one would find in the engine, but rather relative flow rates, small banjo holes vs large.

It's better to try and consider it than simply let the stuff spew out of the banjo bolts. Close gets it.

It's horse shoes and hand grenades, eh?

Tom

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Last edited by Tom Schmitz; 08-21-2014 at 07:20 PM.
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post #23 of 471 Old 08-21-2014, 07:31 PM
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Problem is that relative numbers are only good when the flow rates/pressure differentials are within the same range. If you have a large orifice in the banjo, for example, but the restriction down stream is quite significant, a change to the banjo orifice will have little effect on flow. That type of dynamic is why I was concerned that the flows and pressure differentials are as similar as possible to the engine's.

I'm certain that you already are on this track so was only mentioning this as an indication of what I was thinking.

Last edited by Normk; 08-21-2014 at 07:33 PM.
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post #24 of 471 Old 08-21-2014, 08:26 PM
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But the only downstream restrictions are the bearings, which I'm going to try to simulate. After the bearings it all drops to the sump.

Tom

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post #25 of 471 Old 08-21-2014, 09:59 PM
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Normk andTom:
Am on trip rightnow so comms are compromised. I see no issue with too good a seal on the valve. I don't have the expertise you are seeking re flow rates and restrictions, sorry. Get mod to move these irrelevent posts to a new thread and leave poorpaul in peace!!! Regards....jeff

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post #26 of 471 Old 08-21-2014, 10:41 PM
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Oil Pressure Experiments - 2009 KLR650

I'm moving today's posts that were in Paul's thread to a new thread.

Tom

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“'Why' and 'How' are words so important they cannot be too often used.” -Napoleon Bonaparte


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post #27 of 471 Old 08-22-2014, 12:39 AM
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This is a slippery slope we're riding on!
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post #28 of 471 Old 08-22-2014, 12:44 AM
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Part of it was much ado abut nothing (on my part). The total leak edge area on the cams is greater than the area of the banjo bolt axial hole. The transmission leak edges are even larger, as the shafts are larger and there of 12 edges. I just need to let 'em rip.

"Come along, it'll be a great slide", Tom said with an oily tone.

Tom

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post #29 of 471 Old 08-22-2014, 12:54 AM
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"I'll keep my finger in the pie" Jeff said sweetly!

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post #30 of 471 Old 08-23-2014, 11:23 PM
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I just used compressed air pressure from a regulated air line, continuous supply, steady flow, checked pressure by airing up a tire and using a digital air gauge.
KLR style, Simple, Cheap and Easy, to quote Norm K.

MY modified relief valve, starts relieving at 22-23 PSI, Limits at 32-33 PSI.
It has a very light spring, almost 'zero' preload.
I had to compress the 'REPLACEMENT' spring in a vise, 'just slightly' and heat the end coils, several times.
I have NO WAY to measure my spring, but it is VERY LIGHT, compared to an original! Might I suggest a quarter of the original strength, squeezed between your finger and thumb.

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