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1997 GTX off season closed loop RV lubrication study.

AquaEye

AquaEye

Premium Member
Premium Member

Convection Current - GCSE Physics Practical.​

This is the start.
www.youtube.com/watch?v=Ph4Re3CrUmY
Have two spare 787 motors from a barnyard find. One my son shall rebuild & the other I'm going to use for numerous crazy arse experiments in RV lubrications, yes sir.
Got to construct a practical, working lab bench + a half dozen other items. Will video when I get all the ducks lined up.
Try to get it done by late April, or not.
Julius-Miller-chalkboard (1).webp
 
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So this is the basic "meat & potatoes" of the construct. Of course there will be tailored changes to product design as the study progresses.
All this is to introduce thermal difference to induce thermal convection/flow.
TANK-CT1L8B-L.jpgTANK-CT1L6B-SIDE-L.jpg1ltr anodized
31b5l6Eco3L.jpgL X W TBD
ALL52100__80773.jpg
Can be cut to length
BTR-12JF-L.jpgDW-BTR-12JF.jpgMeh, maybe?

Order of placement within oil circuit TBD after lab bench studies.
All fitting will be 8AN with the option of changing to lessor to accommodate a smaller dia hose if warranted. (static line pressure considered)
All this to knock tank temps down as much as possible w/o compromising too much "real-estate"(?)
 
What are you trying to accomplish by circulating the oil? If there was a need to circulate and/or filter oil, then an oil pump would have been included decades ago. These are old engine designs and the oil bath works fine.
 
WhiskeyD said:
What are you trying to accomplish by circulating the oil? If there was a need to circulate and/or filter oil, then an oil pump would have been included decades ago. These are old engine designs and the oil bath works fine.
Click to expand...
"Trying to accomplish"?
No try to it. It will occur.
What you consider "fine", I do not.
I can because I can, it's a free country.
Cancel elsewhere.
 
Trivial FYI capacity observations using XPS 2T syn oil.
1 ltr
830.9 gr
29.3 oz
1.83 lbs
12mm OEM line @ 18"
36.3 gr
1.28 oz
.077 lbs
Aftermarket oil filter
18 ml
14.8 gr
.525 oz
.033 lbs
3/8 line @ 12"
15 ml
15.0 gr
1/4 line @ 18"
13 ml
10.3 gr
 
AquaEye said:
"Trying to accomplish"?
No try to it. It will occur.
What you consider "fine", I do not.
I can because I can, it's a free country.
Cancel elsewhere.
Click to expand...
I don't think Whiskey is trying to cancel you Aquaeye..just attempting to understand what you are building and it's desired effect, as am I.

Can you explain the experiment for the rest of the class??

Could you diagram your working model and how the components fit? And what are the old seals for?
 
WhiskeyD said:
I didn’t realize we had a genius here that’s knows more than the BRP engineers
Click to expand...
I think Aquaeye is an 'outside the box' experimentalist.

An experimentalist builds strictly with function and performance in mind...willing to challenge the standard practice to add back the durability or performance the engineers left on the table in order to save in materials cost or simplify for mass manufacturing.

We all know history has a hundred examples of design issues engineers either didn't see or chose to overlook!!

The aftermarket is rife with add-ons for all manner of machine to make something out last or out perform standard engineering design...most are created by non-engineer, DIY types!!
 
dougamclean said:
I don't think Whiskey is trying to cancel you Aquaeye..just attempting to understand what you are building and it's desired effect, as am I.

Can you explain the experiment for the rest of the class??

Could you diagram your working model and how the components fit? And what are the old seals for?
Click to expand...
To be revealed on the video in late April.
But I can tell you this much, this is not an experiment. This has already been applied to the aviation Rotax's by a few enthusiast.
Their advantage is they have the luxury of air cooled real-estate. Huge temp differential, ample flow/circulation.
Where as I, do not.
This works. It's proven, actionable science.

Convective Heat Transfer in Fluids | Efficiency, Factors & Applications
 
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Little late on posting progress but life gets in the way sometimes.
Seals came in, using 1.25 expandable plugs, snugged but still able to turn. Using 1of the 3 engines from the "barnyard find".
IMG_4661.JPG
Applied 3 bond 1211 with roller paying attention to amount applied, skim thin, or so I thought:oops:. Applied to only the surrounding RV cavity.
IMG_4666.JPG
Imo, this is too much "squeeze out".
IMG_4662.JPGIMG_4663.JPGIMG_4664.JPGIMG_4665.JPGIMG_4667.JPG
The highly polished roller worked against a uniform application. Too much slip & slide. Going to put some tread on the roller with sandblaster & see if application becomes controlled & predictable. Takes some practice, I reckon.
Heat sinks came in a couple days ago. Next hurdle, weld 1/4-20 studs to tank to secure HS's. Probably have to re-engineer lab bench. Right now it, looks like Jethro threw it together.
The stud sticking out of RV shaft? Got's to have rotation during lab bench run.
Later.....
 
Why so mysterious? Why can't you just explain what you are doing without some mad scientist preamble suspense theory you've concocted after watching a few youtube videos on fluid mechanics? What's next, you are going to re-engineer the wheels on your trailer?
 
K20017 said:
Why so mysterious? Why can't you just explain what you are doing without some mad scientist preamble suspense theory you've concocted after watching a few youtube videos on fluid mechanics? What's next, you are going to re-engineer the wheels on your trailer?
Click to expand...
Read the entire thread & discern, smartass.
 
Are you trying to circulate the oil and cool it somehow? Do you think the oil bath temps cause premature wear? The whole "All this is to introduce thermal difference to induce thermal convection/flow" doesnt make sense inside of a hot boat hull.
 
AquaEye said:
Little late on posting progress but life gets in the way sometimes.
Seals came in, using 1.25 expandable plugs, snugged but still able to turn. Using 1of the 3 engines from the "barnyard find".
View attachment 69335
Applied 3 bond 1211 with roller paying attention to amount applied, skim thin, or so I thought:oops:. Applied to only the surrounding RV cavity.
View attachment 69336
Imo, this is too much "squeeze out".
View attachment 69337View attachment 69338View attachment 69339View attachment 69340View attachment 69341
The highly polished roller worked against a uniform application. Too much slip & slide. Going to put some tread on the roller with sandblaster & see if application becomes controlled & predictable. Takes some practice, I reckon.
Heat sinks came in a couple days ago. Next hurdle, weld 1/4-20 studs to tank to secure HS's. Probably have to re-engineer lab bench. Right now it, looks like Jethro threw it together.
The stud sticking out of RV shaft? Got's to have rotation during lab bench run.
Later.....
Click to expand...
After cure, split case & it is inside as it was on the outside, entirely to much "squeeze out". Unacceptable. The 1211 did as intended, filled in two areas that had indentations/pit but the rest of the mating surface was completely devoid of 1211. Testament to precise machining @ Rotax. Blasted roller to give it some tread, & will apply even less 1211 to roller & let the weight of roller(.57lbs) dictate application thickness.
IMG_4666.JPGIMG_4677.JPG

Sorry, no pics to validate this event so take it with a grain of salt..
 
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