GT40s.com
MK-I  MK-II  MK-III  MK-IV  GULF  MIRAGE  J-CAR  LOLA
GT40s.com
Home Forum Gallery Support GT40s.com  
Register FAQ Advertisers Search Today's Posts Mark Forums Read

Go Back   GT40s.com > >

Notices

GT40 Tech - Powertrain/Transaxles Transaxles and driveline - don't dare post engine things here!

Reply
 
Thread Tools Display Modes
Old 22nd May 2018, 09:34 PM   #1
George Cadavid
Rookie
United States
 
Join Date: Apr 2018
Location: Miami
GT40: Active Power GT
Posts: 28
Inverted 997 tranny oil level

I researched but was unable to get a definitive answer. Its my understanding that a Porsche 997 transaxle takes 3 quarts of oil. By inverting the transaxle will it now require more oil for proper lubrication??? Thanks
George Cadavid is offline   Reply With Quote
Old 23rd May 2018, 11:48 AM   #2
Howard Jones's Avatar
Howard Jones
Gold Supporter
United States
 
Join Date: Jun 2002
Location: N Braunfels TX
GT40: GTD
Posts: 4,158
Re: Inverted 997 tranny oil level

Call:

CALIFORNIA MOTORSPORTS INC – California Motorsports Inc
Howard Jones is offline   Reply With Quote
Old 24th May 2018, 05:59 PM   #3
George Cadavid
Rookie
United States
 
Join Date: Apr 2018
Location: Miami
GT40: Active Power GT
Posts: 28
Re: Inverted 997 tranny oil level

Thank you, I called them and they answered my question.
George Cadavid is offline   Reply With Quote
Old 24th May 2018, 11:25 PM   #4
Big-Foot's Avatar
Big-Foot
Administrator
United States
 
Join Date: Jan 2007
Location: Kenyon, MN
GT40: Gulf Cart
Posts: 6,772
Re: Inverted 997 tranny oil level

You might want to share that answer here. That way it may be found in a search by someone else that may need that info in the future!
__________________
Regards - Randy
-- Youth and talent are no match for old age and treachery!
GT40 RCR40 #45 G50-331-Weber IDAs ((Sold))
My build site:
To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.
Big-Foot is offline   Reply With Quote
Old 25th May 2018, 02:40 AM   #5
Ryan Love
3 Tenths
Australia
 
Join Date: Apr 2007
Location: Melbourne - Aus
GT40: Scratch Build
Posts: 368
Re: Inverted 997 tranny oil level

If I was having a to answer the same question, this is how Iwould go about it.
I would install a clear plastic drain tube that was longenough that I could loop around and over the top of the transaxle wheninstalled in its standard orientation. Iwould then fill it and record the height of the oil relative to the lower gearcluster shaft in the gear box.I amassuming that the oil level sits below the centre line of this shaft.When in operation the gears pick up the aeratedoil as the splash through the bottom of the case.I would then drain the oil, flip the case andinstall a similar drain line in the inverted box.I would re fill the box until I had achieveda similar coverage of the new lower shaft.The only thing to watch out for may be if the ring gear now sits in alarge depression and would be likely to sit in a pool of oil, causing excesswindage, drag and potential for hydroscopic pitting.

Anyone care to comment on that methodology?
No idea if its right, however getting an answer from someonelike CMS does seem like it’s a better idea.


Ryan
Ryan Love is offline   Reply With Quote
Old 25th May 2018, 03:35 PM   #6
Howard Jones's Avatar
Howard Jones
Gold Supporter
United States
 
Join Date: Jun 2002
Location: N Braunfels TX
GT40: GTD
Posts: 4,158
Re: Inverted 997 tranny oil level

Ryan. I agree that's a good way to determine how much oil is needed. Then I filled the cooler, filter, and the lines and measured the amount in them and added to the tranny fill amount. In my car (G50) the total came to right at 1 gallon. CMS is where I got my G50 and I highly recommend them. I 'm sure they have a preferred fill volume.
Howard Jones is offline   Reply With Quote
Old 25th May 2018, 04:19 PM   #7
George Cadavid
Rookie
United States
 
Join Date: Apr 2018
Location: Miami
GT40: Active Power GT
Posts: 28
Re: Inverted 997 tranny oil level

CMS said it should work but I did not get that feeling and wanted confirmation. I contact someone who a few months ago finished his build with a Porsche 996 transaxle. He said he used just under the recommented 3 quarts of oil and plugged the Vent. His tranny is working great. All I need now is to find the way of properly plugging the vent and good to go. Thank you all for your input.
George Cadavid is offline   Reply With Quote
Old 25th May 2018, 08:58 PM   #8
Big-Foot's Avatar
Big-Foot
Administrator
United States
 
Join Date: Jan 2007
Location: Kenyon, MN
GT40: Gulf Cart
Posts: 6,772
Re: Inverted 997 tranny oil level

Thanks for sharing that George!

As I recall from a previous thread, the key concern was that the counter/lay shaft is normally submerged, but when inverted, it is above the level of oil if filled to normal capacity.. I don’t recall where we left off with that conversation though...
__________________
Regards - Randy
-- Youth and talent are no match for old age and treachery!
GT40 RCR40 #45 G50-331-Weber IDAs ((Sold))
My build site:
To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.
Big-Foot is offline   Reply With Quote
Old 26th May 2018, 05:47 PM   #9
George Cadavid
Rookie
United States
 
Join Date: Apr 2018
Location: Miami
GT40: Active Power GT
Posts: 28
Re: Inverted 997 tranny oil level

I spoke to Chris from Active Power who builds many of his cars with inverted Porsche transaxles. Use vise grips and remove the vent on top of the tranny by moving it back and forth until it pops out. Then use a 1/4 inch pipe tap that will fit perfectly. Use grease on the tap while tapping the hole to keep the aluminum slivers out. Then use a 1/4 pipe plug to seal the hole. Then drill a 1/8 inch hole on the oil drain plug that now will become your new vent. I just did it on my tranny and Iím good to go.
George Cadavid is offline   Reply With Quote
Old 26th May 2018, 09:35 PM   #10
blueovalz's Avatar
blueovalz
Skinny Man
United States
 
Join Date: Aug 2008
Location: Arkansas
GT40: An orange car
Posts: 2,126
Re: Inverted 997 tranny oil level

I'm assuming there is something preventing debris/moisture from getting into the 1/8" hole?
__________________
Terry


To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.
blueovalz is offline   Reply With Quote
Old 27th May 2018, 10:02 AM   #11
George Cadavid
Rookie
United States
 
Join Date: Apr 2018
Location: Miami
GT40: Active Power GT
Posts: 28
Re: Inverted 997 tranny oil level

You can always tap a small hole on the former oil plug and screw in an elbow fitted with a hose.
George Cadavid is offline   Reply With Quote
Reply

Tags
inverting, oil, quarts, takes, transaxle


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Display Modes

 
Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On

Forum Jump


All times are GMT -4. The time now is 05:35 PM.