Oil Pressue Gauge Damping

[posplayr]

Quote:
Originally Posted by salty_monk
Couldn't you put a brass washer into the elbow to restrict the flow?

Dan

I'll bet I could come up with something, and you could get it made for me.

wake up guys; see the first post

http://www.thegsresources.com/_forum/showpost.php?p=988942&postcount=1

[renobruce]

I think the pulsing is probably normal. Keep in mind that the gauge is measuring a very small amount of pressure in a small range... a 1-2 psi pulse is very small pressure wise, but shows alot on the gauge.

I'm going to order up a 0-30 gauge and install it. If the problem is with pulse, it should be less sensitive. If it's from vibration, there should be no change.

[renobruce]

Quote:
Originally Posted by salty_monk
Couldn't you put a brass washer into the elbow to restrict the flow?

Dan




wake up guys; see the first post

http://www.thegsresources.com/_forum...42&postcount=1

I saw that, and it's a good idea. But it would be a pain to do if you are selling several per week.

[posplayr]

If the problem is with pulse, it should be less sensitive. If it's from vibration, there should be no change.

I already know that the pulsing is due to pressure changes. That is why it reduces with the restriction.

The question is once the pressure pulse is moderated, how stable is the guage under vibration alone.

[ryonker]

I have an oil cooler and an oil pressure gauge from Bruce. Mine does peak out pretty much every time I start the bike, but doesn't fluctuate much at all afterwards. At idle it hovers around 2 to 3 psi. I don't see the wild fluctuations being described, but maybe mine is an exception.

Rick

[salty_monk]

I saw that, and it's a good idea. But it would be a pain to do if you are selling several per week.

me too, I was just thinking large scale rather than "Jim in his shed"

I would think at worst it would need a brass bush made to similar dimensions to Jim's filler that fits in the elbow. Should be trapped by the elbow & the gauge I would think if the elbow is abgled or tapered. Worse case you'd have to cross drill the bottom or do something that looks like a castle nut (hub nut) to ensure you got flow to the centre of the bush or put a slight taper on it so it was a press fit or something & couldn't drop down & block flow.

I've never studied one of these gauges & the elbow in ernest but I'm sure it would be a pretty simple thing to figure out & yes I'm pretty sure I could get them made up for you fairly cheap in qty.

Cheers,

Dan

[posplayr]

ryonker

So you have an 8V GS750 with little bounce.

I have 16V GS1100E sound like the top end oiler may be an issue.


Ed,
What bike were you running one? Did you get alot of needle bounce?

I will move the guage to my 81 GS750E (16V) to see what it does there.

pos

[salty_monk]

Ed was running his on a 82 GS850G. I think he had an oil cooler on it & off it at the time from memory (ie. he ran it both with & without).

Dan

[Nessism]

Mine is on an 850. Needle has high frequency oscillation and no longer comes back to zero. The gauge was only on the bike for about 800 miles and has never been subjected to missed shifts or anything of the sort. During the recent SW rally, I noticed one of the GSR member's bikes that has one of those gauges and it also didn't come back to zero - it was worse than mine.

[renobruce]

So you have an 8V GS750 with little bounce.

I have 16V GS1100E sound like the top end oiler may be an issue.


Ed,
What bike were you running one? Did you get alot of needle bounce?

I will move the guage to my 81 GS750E (16V) to see what it does there.

pos

It could just be a defective gauge.

[posplayr]

It could just be a defective gauge.

Bruce, when teh biek is cold and the oild is thick there is little oscillation. Even when hot at idle the bouncing is moderate as the RPM is low.

It is at 4-5K RPM where the needle will flail.

Does that sound defective?

Again it gets better with more restriction.

If the damper in the guage is not working then maybe that is what you mean by defective.

[renobruce]

Bruce, when teh biek is cold and the oild is thick there is little oscillation. Even when hot at idle the bouncing is moderate as the RPM is low.

It is at 4-5K RPM where the needle will flail.

Does that sound defective?

Again it gets better with more restriction.

If the damper in the guage is not working then maybe that is what you mean by defective.

My gauges on my bikes don't fluctuate much at all. I do get a little bounce (maybe 1 psi) when I'm riding. But if it's sitting, hot or cold, I don't get any to speak of. So yes, maybe it's something wrong with the gauge. I had a guy complain once that his bounced all over the place. I replaced it and he said it was all better.

[posplayr]

me too, I was just thinking large scale rather than "Jim in his shed"

I would think at worst it would need a brass bush made to similar dimensions to Jim's filler that fits in the elbow. Should be trapped by the elbow & the gauge I would think if the elbow is abgled or tapered. Worse case you'd have to cross drill the bottom or do something that looks like a castle nut (hub nut) to ensure you got flow to the centre of the bush or put a slight taper on it so it was a press fit or something & couldn't drop down & block flow.

I've never studied one of these gauges & the elbow in ernest but I'm sure it would be a pretty simple thing to figure out & yes I'm pretty sure I could get them made up for you fairly cheap in qty.

Cheers,

Dan

I'll let you guys work on manufacturing, but for what I did it takes about 2 minute to:
1.) fill the chanber with paper towel to keep epoxy out.
2.) fill engine side of the plug with automotive structural epoxy
3.) 1 hr to dry
4.) 15 sec drill a 0.039 hole.

If you custom make the elbow, dont drill as big of a hole, but drilling 1/2" of brass with a 0.039" drill will take a few minutes.

If you want to use a plug of something, you will still end up drilling it out. It works best if it is relatively soft. Expoxy self forms and drys hard and is easy to drill.

I'll defer to you guys on time motion studies for high volume production optimization

Jim

[salty_monk]

You can't CNC paper towel & Epoxy ideal solution for what you're doing though

[katguy]

I thought those pressure gauges were liquid filled and provided dampning... not true?