The Triumph Dolomite Club - Discussion Forum

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PostPosted:Thu Apr 15, 2021 7:16 pm 
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Location:Harrow Middlesex
So if your now going for the ford axle,what are you planing for the wheels fords have a different wheel stud pattern

Dave


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PostPosted:Thu Apr 15, 2021 7:30 pm 
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Quote:
So if your now going for the ford axle,what are you planing for the wheels fords have a different wheel stud pattern

Dave
My plan was always to use a Ford axle, for cost, availability, and for the wheels! In the front, I’ve used Sprintspeed stub axles which let me use a Ford escort pattern hub

The change in bolt pattern increases the choice I have for wheels 100x over. I’m either going to run banded steel wheels or a Ronal Turbo rep wheel with the turbo part removed at 7 inch in 13 or 15 inch.

The Ford 4x108 patter is so common, can get almost any wheel style. I could even throw 17/18 inch from a modern Ford on there. I never would because it would look so ridiculous.

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PostPosted:Thu Apr 15, 2021 9:15 pm 
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Joined:Wed Oct 04, 2006 8:49 pm
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Location:Sutton,Surrey.
I’m certain a standard rear Escort axle won’t be much stronger than say a Sprint axle.
I know I’ve broke/snapped quite a few.
Even with a mildly tweaked pinto.

Use to change gear when the valves bounced.
Those where the days before Gatso’s and camera vans.

_________________
2005 Mercedes C Class V6 Diesel Turbo Daily Driver.
1980 Dolomite Sprint with a touch of BLTS
Balanced Lightened and Tweaked 13B Rotary and SuperCharged.
Rebuilding the Sprint time taken so far, 111Hrs@15/12/2020

Member TDC no 0471

Project 13B Sprint now back on. 121 @ 15/04/2021


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PostPosted:Fri Apr 16, 2021 9:07 am 
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Quote:
I’m certain a standard rear Escort axle won’t be much stronger than say a Sprint axle.
I know I’ve broke/snapped quite a few.
Even with a mildly tweaked pinto.

Use to change gear when the valves bounced.
Those where the days before Gatso’s and camera vans.
From some online research, a stock English definitely would not stand up to a Sprint axles I think I’ve asked on here before and the rating I’ve been told for a sprint axle is around 240hp with some gentle driving. As far as I can tell, a stock English would break at around 150hp with some heavy driving, new shafts get to around 250hp. but a built English would go pretty far.

RetroFord do a build kit, which is a limited slip diff and larger half shafts which apparently push the rating to over 300hp. Considering that the jag engine makes less power than this stock, but will produce considerably more torque than a high power 4pot, I think even with this it’ll be a matter of time before something breaks.

Which makes the other point easier to make, the cost to repair and replace. I can find and source old English axles with relative ease quite cheaply. I’m going tomorrow to get two English axle casings for the grand sum of £40!! A LSD is anywhere from £300 used to £600 new, there’s dozens of companies making them, same goes for half shafts

A sprint axle?? There currently isn’t one for sale on any market place online, unless there’s one or two available on here, so I can’t get an accurate price, and a LSD from quaife/rimmerbros?? £1000!, and there’s pretty much no aftermarket support.

Yes, I know a sprint axle would just drop in and work, but I’d pay for it in the long run. I’d rather pay the £2k to build up an English with minimal fabrication knowing I could easily replace it

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PostPosted:Sat Apr 17, 2021 10:38 pm 
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Joined:Sun Nov 16, 2014 12:46 am
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Location:Midhurst, West Sussex.
Sprint axles come up quite often for £200-250. I paid £200 for one last September. The 2Spec Helical LSD is only £580.


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PostPosted:Sun Apr 18, 2021 7:19 am 
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Joined:Fri Oct 06, 2006 8:57 am
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Location:Auckland, New Zealand
I successfully ran a 3L Capri English axle on my race sprint for over a decade. The initial decision came about after a ‘professional’ incorrectly installed an LSD in my original Sprint axle. Given another axle just wasn’t available locally, the Ford unit was the closest fit and the Capri version had 9” drums on the back, same as the Sprint. We cut the mounts off the Ford axle and welded on the Sprint ones, so handling wasn’t affected.

This axle then survived 12 years of racing or approx. 9000km, all of which was competitive circuit racing (Dolomite Sprint No 20 on Youtube). All races started with dropping the clutch with engine at 5000-5000rpm and cornering forces were on 195-60 race compound tyres.

During this period I did have to rebuild the LSD once and also fit a replacement, but not until after 10 years. Standard half shafts were the weakest link with the high cornering forces. Eventually I snapped one during cornering but that left via the inner guard and boot, so caused substantial damage. After that I fitted extra strong half shafts from 3J Driveline which were fine.

Given this I think you should find they will take a lot of abuse on a road car, even if there is a more powerful engine fitted. Obviously they need to re rebuilt carefully and checked regularly, especially if they are going to be pushed to the limit.

Geoff


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PostPosted:Mon May 03, 2021 5:14 pm 
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Had a good Bank Holiday weekend, and finally did what I should have done years ago, and made an axle mount jig.

Been putting it off cos of the cost of buying box section and trying to work out how to recreate the inner mounts. But I was digging through my wood pile in my garage and pulled out some metal box section that I’d entirely forgotten I owned!!

Turns out it’s a cheap metal bed frame, made of 50x50 and 40x20 box, and perfect for a jig!

So cut it to length, just over the length of the outer outer mounts and rested it on the front of the outer mounts. To ensure squareness and so it didn’t move, i clamped it to the diff housing nuts, making sure that the nuts were in the same orientation.

I cut some of the off cuts up to fit into the outer mount, drilled some 12mm holes, and used the proper 7/16 bolt to align the holes, putting some G clamps to make sure it was the right angle.

Threw a handful of tack welds on just to keep it in place, while I moved onto the upper mounts.

My main issue with these is the design of the upper arms, well my main issue with the rear suspension in general, is the choice use of bushes in some odd ways. The inner axle-side mounts are a sandwich bush, which essentially creates a rubber spring. so when the axle is in bump, it creates a force trying to rotate the axle nose down AND nose up. Nose down from the articulation of the axle upwards and nose up as from the articulation of the inner arms. Also making new copies of them is an absolute pain, so I’m changing to a “solid” bush in the form of a rose joint. This will also allow me to make the pinion angle adjustable, as well as down the line the axle alignment/rear toe.

So, cut some box and use an M8 bolt with a 13mm head, and with the 1mm wall thickness of the box gave the right thickness.

Made some circles that fitted perfectly in the axle mount and centrally mounted the bolt and welded it all together. My idea is to make one side mount first, then use the ball joint to locate the other side correctly.

With this all made up, then welded this to the main box with some stand offs. Went to lift it off and realised how flimsy it was so added some bracing which was spare from another project.

Then, had to cut my nice, perfectly round, perfectly sized circles so I could get the damn thing in and out of the axle!

But now, it slides in and out and fits perfectly!

Now to copy it over to my English casings, one to go on the car and one to build up to survive abuse.


Attachments:
File comment:My nice circle plate to sit in the inner mounts
B9E95106-E5E7-4954-9B89-F6E79B1D821C.jpeg
B9E95106-E5E7-4954-9B89-F6E79B1D821C.jpeg [29.55KiB |Viewed 37 times ]
File comment:All mounts added, just before final welding
1DB64FFD-2168-4A2F-A128-F745CE323CC1.jpeg
1DB64FFD-2168-4A2F-A128-F745CE323CC1.jpeg [34.61KiB |Viewed 37 times ]
File comment:Outer mounts and main bar clamped to the axle pre-weld
9208BCDF-BD5F-47AC-8099-9BDBA7C63681.jpeg
9208BCDF-BD5F-47AC-8099-9BDBA7C63681.jpeg [34.49KiB |Viewed 37 times ]

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So many ideas... So little budget... So little time.
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