Sven
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| posted on 31/7/05 at 05:42 PM |
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Research continues
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
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CD-5
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| posted on 1/8/05 at 06:32 PM |
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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 .
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kb58
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| posted on 1/8/05 at 07:49 PM |
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What about reverse?
Mid-engine Locost - http://www.midlana.com
And the book - http://www.lulu.com/shop/kurt-bilinski/midlana/paperback/product-21330662.html
Kimini - a tube-frame, carbon shell, Honda Prelude VTEC mid-engine Mini: http://www.kimini.com
And its book -
http://www.lulu.com/shop/kurt-bilinski/kimini-how-to-design-and-build-a-mid-engine-sports-car-from-scratch/paperback/product-4858803.html
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Sven
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| posted on 1/8/05 at 08:01 PM |
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quote:
Originally posted by kb58
What about reverse?
I'm not going to concern myself with reverse. The car will be light enough that I can easily push it.
-Steve
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Sven
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| posted on 1/8/05 at 08:04 PM |
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quote:
it's not cheap but if they done it ...why can't you. For availability civics are plentiful and cheap .
The Civic diff I have seen, as I said, had a spiral cut into the wall of where the axle pops in. It appears this is for lubrication but in my case
that would mean leakage.
I suspect Quaife made some alterations to their ATB diffs so they could be run externally to a housing.
-Steve
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Lotusmark2
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| posted on 1/8/05 at 08:06 PM |
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I will be using a Supra LSD below, Is a quite easy mod (famous last words)
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Sven
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| posted on 1/8/05 at 10:09 PM |
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quote:
Originally posted by Lotusmark2
I will be using a Supra LSD below, Is a quite easy mod (famous last words)
Looks just the ticket ... do you remember what model/year supra that was from?
-Steve
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Rorty
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| posted on 2/8/05 at 05:03 AM |
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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.
Cheers, Rorty.
"Faster than a speeding Pullet".
PLEASE DON'T U2U ME IF YOU WANT A QUICK RESPONSE. TRY EMAILING ME INSTEAD!
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Lotusmark2
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| posted on 2/8/05 at 05:56 AM |
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quote:
Looks just the ticket ... do you remember what model/year supra that was from?
-Steve
Hi steve it was from a 1987 Supra, its not as big as it looks, but to be honest I woul rather go a bit ott with the diff and not run the risk of
killing diffs.
cheers
Mark
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Rorty
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| posted on 2/8/05 at 06:02 AM |
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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
Don't worry, a BEC will never kill a car diff!
Cheers, Rorty.
"Faster than a speeding Pullet".
PLEASE DON'T U2U ME IF YOU WANT A QUICK RESPONSE. TRY EMAILING ME INSTEAD!
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Sven
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| posted on 2/8/05 at 06:07 AM |
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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.
VW it is. Thanks Rorty. I'll see if my local pull-it has the whole front setup I can swag.
I like the idea of using a VW due to the prodigious quantity of aftermarket support in terms of LSDs, axles, brakes and whatnot.
I'll probably try and get two sets of hubs and uprights and use the same on the front with an adjustable brake bias.
FWIW, if anyone is interested, it seems like the Supra diff is also used in the Lexus IS300.
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Rorty
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| posted on 2/8/05 at 06:35 AM |
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Hugh Jarce posted a pic of a VW diff on this thread:
http://www.locostbuilders.co.uk/viewthread.php?tid=18300 
Cheers, Rorty.
"Faster than a speeding Pullet".
PLEASE DON'T U2U ME IF YOU WANT A QUICK RESPONSE. TRY EMAILING ME INSTEAD!
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Minicooper
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| posted on 4/8/05 at 08:44 AM |
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"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
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Sven
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| posted on 11/8/05 at 10:44 PM |
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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
My bad, I really meant Quaife must have made changes to the ATB diffs they sell for BECs.
Ebay has a VW diff for sale now. 1c! 
This look like the ticket?
http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&item=7992475844
-Steve
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Rorty
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| posted on 11/8/05 at 11:45 PM |
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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.
Cheers, Rorty.
"Faster than a speeding Pullet".
PLEASE DON'T U2U ME IF YOU WANT A QUICK RESPONSE. TRY EMAILING ME INSTEAD!
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Minicooper
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| posted on 12/8/05 at 07:05 AM |
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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
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Sven
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| posted on 12/8/05 at 07:22 AM |
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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.
Understood ... I think. So that the sprocket is then mounted to the outside of the ring gear flange? I do like that, it'll probably help with
the issue of chainline and motor positioning in the finished car which I suspect is constrained by whatever axles I can use. Unless, of course, I
get their length professionally modified to suit ... which costs quite a bit I believe.
I'll just belly up and get me one of those then work out any issues. Gotta start somewhere. Ideally, I'd like to find a wrecked Golf or
similar and tear out it's whole front drivetrain, hubs and brakes ... minus the motor of course.
Thanks Rorty!
-Steve ... wrecking yard bound!
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Rorty
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| posted on 12/8/05 at 08:47 AM |
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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.
Cheers, Rorty.
"Faster than a speeding Pullet".
PLEASE DON'T U2U ME IF YOU WANT A QUICK RESPONSE. TRY EMAILING ME INSTEAD!
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Sven
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| posted on 12/8/05 at 08:04 PM |
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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.
Righty-o ... clear as a bell ... thanks mate!
-Steve
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