Quiet in here init? Hopefully I can get some juices flowing with this question.
I'm still working on my Locost, but I'm using downtime to research a BEC middy. I think I have a lot of the concepts down in terms of using
a car differential but I still do not know what would be the best diff to use.
One option would be to hit Ecology (the local pull-it type wrecking yard) and remove a few diffs to stare at. Another option is to ask you all.
Looking at a diff from a Honda (at Casa Graber) didn't appear to be useful in that it had passages allowing oil to lube the axles and, I think,
this would mean it would be difficult to seal.
I'm thinking a diff without oil passages, where the axle 'fitting' is already sealed and the actual diff support itself is as parallel
as possible would be ideal. This latter requirement seems interesting as it would make it easier to encase the diff.
I have heard that a FWD VW diff might be useful on both counts.
Anyone got any pics of various differentials I could stare at before hitting the wrecking yards or any suggestions on which donors to hit?
I would want to take the whole differential, axles, CVs, hubs, brakes, etc. Ideally the hubs would be able to be modified to take balljoints, at
least on the bottom, or maybe a spherical heim/rose joint on the top.
-Steve
honda diff can be used for chain drive .... see quaife web site for that...
Here!
it's not cheap but if they done it ...why can't you. For availability civics are plentiful and cheap .
What about reverse?
quote:
Originally posted by kb58
What about reverse?
quote:
it's not cheap but if they done it ...why can't you. For availability civics are plentiful and cheap .
I will be using a Supra LSD below, Is a quite easy mod (famous last words)
quote:
Originally posted by Lotusmark2
I will be using a Supra LSD below, Is a quite easy mod (famous last words)
That Supra diff is an aweful looking brute of a thing. I can't offer any pics, but I have done what you are chasing with Golf and BMW 3 series diffs on several occasions. The oil can't leak out around the drives because the flanges are actually retained by O-rings.
quote:
Looks just the ticket ... do you remember what model/year supra that was from?
-Steve
quote:
Originally posted by Lotusmark2
...I woul rather go a bit ott with the diff and not run the risk of killing diffs.
cheers
Mark
quote:
Originally posted by Rorty
That Supra diff is an aweful looking brute of a thing. I can't offer any pics, but I have done what you are chasing with Golf and BMW 3 series diffs on several occasions. The oil can't leak out around the drives because the flanges are actually retained by O-rings.
Hugh Jarce posted a pic of a VW diff on this thread:
http://www.locostbuilders.co.uk/viewthread.php?tid=18300 
"I suspect Quaife made some alterations to their ATB diffs so they could be run externally to a housing."
Sven
Quaife have not modified the ATB the grease leaks out or the oil will pour out where it drives the CV joint either side where the spiral is cut. They
were certain it wouldn't leak when I asked but they do
You need to use the sealed bearings and also build in the normal oil seals as you fitted to the standard escort fiesta box into a custom bearing
housing
Cheers
David
quote:
Originally posted by Minicooper
"I suspect Quaife made some alterations to their ATB diffs so they could be run externally to a housing."
Sven
Quaife have not modified the ATB the grease leaks out or the oil will pour out where it drives the CV joint either side where the spiral is cut. They were certain it wouldn't leak when I asked but they do
You need to use the sealed bearings and also build in the normal oil seals as you fitted to the standard escort fiesta box into a custom bearing housing
Cheers
David
That's the one! You need to machine into those webs a little bit to form a shoulder/register for the sprocket to mount onto. Then you'll need to spin/fabricate a can to enclose the main part of the casting to contain the oil.
My bad, I really meant Quaife must have made changes to the ATB diffs they sell for BECs.
Sven,
I'm talking about the Quaife chain drive BEC diff, anyway doesn't matter if your going to use the VW diff
quote:
Originally posted by Rorty
That's the one! You need to machine into those webs a little bit to form a shoulder/register for the sprocket to mount onto. Then you'll need to spin/fabricate a can to enclose the main part of the casting to contain the oil.
Yes, the sprocket sits on the outside of the ring gear flange. The can has a flang on the large end which sits flat against the inside of the ring
gear flange and is held on by the same bolts as the sprocket. The can flange seals against the ring gear flange with a large O-ring (machine the
groove into the flange when you have the diff in the lathe to turn the sprocket register).
The small end of the can has an O-ring seal against the diff casting too. At least that's the way I've done it in the past.
Don't forget to weld a filler/drain boss into the can.
quote:
Originally posted by Rorty
Yes, the sprocket sits on the outside of the ring gear flange. The can has a flang on the large end which sits flat against the inside of the ring gear flange and is held on by the same bolts as the sprocket. The can flange seals against the ring gear flange with a large O-ring (machine the groove into the flange when you have the diff in the lathe to turn the sprocket register).
The small end of the can has an O-ring seal against the diff casting too. At least that's the way I've done it in the past.
Don't forget to weld a filler/drain boss into the can.