Cool Transmission

[halbug]

Hi folks, I have been playing with the idea of cooling the oil of my Berg-5 transmission and using the cooled oil for some pointed extra lubrikation some time now. Time to make it happen

Buying Cooler and Pump was easy

I couldn't get fittings to fit into the housing at the original openings. Because my little lathe can not turn tapered threads, I bought fittings with have at least the correct M24x1,5 tapered threads and made adapters for M16x1 Banjos

[img]https://www.thesamba.com/vw/gallery/pix/1988545.jpg[/img

I think it is ok to have a fitting under the transmission with the Berg cross bar in front of it. Otherwise I would be worried having it as the lowest point of the car...
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Stealth Ghia Transformation: http://www.thesamba.com/vw/forum/viewtopic.php?p=7226044&highlight=#7226044
My Berg5: https://www.thesamba.com/vw/forum/viewtopic.php?t=730276&start=0

[halbug]

Based on some Porsche racing transmissions I have seen, I like the idea to return the cooled oil through jets directly onto the gears - at least some of the oil...

To make sure I have constant pressure and therefore even supply to all those points, I designed a distributor block with build-in pressure regulator. Anything past 10-14psi (adjustable with washers) will return directly into the case, through the oil filler hole.

And yes, it is a fuel injection rail profile

Drilling and tapping the case will cost me some nerves for sure To help guide the tap positively towards the gear, I drilled it with a harded bit. A 3mm rod will act as a guide for tapping into the right direction

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Stealth Ghia Transformation: http://www.thesamba.com/vw/forum/viewtopic.php?p=7226044&highlight=#7226044
My Berg5: https://www.thesamba.com/vw/forum/viewtopic.php?t=730276&start=0

[Mr. OGPaint]

You have my attention
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https://instagram.com/mr.ogpaint
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Patrick Hall

[bedlamite]

Filter?

[oprn]

This is an interesting idea, most likely totally unnecessary or auto makers would have had a version of it in production years ago. You say Porsche used it in race cars? I like to see unique things and ideas and have enjoyed tinkering on the impractical/unnecessary side of reality myself so... I'm following this with interest!

This is not very different from oiling systems I have seen and worked with on industrial machinery before. I have been called upon to tube in these kind of systems from oil pump to lube points on new installations and to troubleshoot and maintain them afterward.

[Wreck]

There is a little on oil feed modifications on this thread , it's on a 094 trans by "Gears". but the same principles apply .


https://www.thesamba.com/vw/forum/viewtopic.php?t=...mp;start=0

[halbug]

Thank you all!

I will study the story from gears for sure. Part of my plan is to give the 5th gear and rear upper mainshaft bearing some extra lubrication also...

Filter will be In-Line, but I have to decide which one yet - any recommendations?

I think the conversation does make sense - obviously - otherwise I would not do it

From my own experience and talking to some racers, I know that the Type 1 transmission gets way to hot when paired with a big motor and Autobahn usage

Have a nice Sunday!
_________________
Stealth Ghia Transformation: http://www.thesamba.com/vw/forum/viewtopic.php?p=7226044&highlight=#7226044
My Berg5: https://www.thesamba.com/vw/forum/viewtopic.php?t=730276&start=0

[madmike]

Heat is an 'automatic transmission' worst enemy.
Standard shift manuals don't need a cooler, It don't get that hot in Germany
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76 Drag/Street bug 2180cc 'Turbo' 11:85 @113 mph"If I go any faster I'll burn up the Hamster" ,gets 28 mpg. also 10/09/22 11.90 @115 mph
"If I'm ever on Life Support,UNPLUG Me, Then Plug me back In see if that Works"

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[oprn]

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[oprn]

The Jetta 5 speed gear boxes have the 5th gear on the end, in a separate section of the case really. When they run low on oil the first thing to show stress is the 5th gear needle bearing cage. If your transaxle is set up the same then positive oiling would not be a bad thing.

Or in the case of the Jetta, a closer eye on the tranny oil level... my bad! I saw the drip and assumed it was engine oil!

[jbbugs]

https://patrickmotorsports.com/products/tra-901-oil-clk-pms
The 914’s had some trans cooling issues when racing.
Not sure it’s really necessary on a Ghia since all the heat from the engine is behind the trans rather than in front of it.
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69 OG paint Transporter
73' Super Beetle Champcar Endurance Roadracer
Patina my ass, that's a Rust Bucket!

[oprn]

Hey! Just had a thought - I was wondering how the oil pump would handle cold heavy tranny oil on start up but why not put a temp switch in the tranny and it would only come on when needed.

[spencerfvee]

hi I wonder if the pick up hose .at the bottom of your trans case . would be prone to things in the road .hitting it and pushing the hose off . would you make a guard over the hose .? so this would not happen . also this would be great to cool the oil in the trans. for racing only . but go for it .let every one know how well it works on the street . good luck

[gears]

Cooled / filtered oil should be fed primarily to pinion bearing, mainshaft ball bearing, and 4th gear. During Autobahn driving, you can be sure 4th (or 5th) gear is running hot, which over time affects longevity of both the mainshaft ball bearing and the gears needle bearing.

Our early Type 1 Elephant housing had an oil return right over 4th gear & ball bearing:

You can get further ideas (gun-drilled mainshaft, modified pinion bearing etc) from this recent Syncro transaxle build thread:
https://www.thesamba.com/vw/forum/viewtopic.php?t=725130

Thompson Gun-Drilling has drilled dozens of Porsche and VW mainshafts for us in the past ..
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9.36 @ 146 in '86 Hot & Sticky
'90 Syncro Westy SVX
'87 Syncro GL 2.5
https://guardtransaxle.com

[halbug]

WOW! I love the responses - Thank you

The alternative to picking up the oil from the drain plug location, would have been to convert one of the lower side plate studs to a larger, gun drilled stud. I did not like that too much either. And - as mentioned - I hope the forward transmission mount (as seen on picture above) will protect the banjo.

As for switching the pump, I agree, I will add a temperature switch. As the modification is for additional oiling AND cooling I may switch the pump on at 110F and install a small mechanical thermostate to control the oil temperature. Or switching at 200F without inline-thermostate... not sure yet
_________________
Stealth Ghia Transformation: http://www.thesamba.com/vw/forum/viewtopic.php?p=7226044&highlight=#7226044
My Berg5: https://www.thesamba.com/vw/forum/viewtopic.php?t=730276&start=0

[halbug]

[SBD]

Very interesting!
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