The Superboxer, a new heart for the Silver Bullet

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Re: The Superboxer, a new heart for the Silver Bullet

Postby silverbullet » 01 Nov 2016, 21:05

http://s1103.photobucket.com/user/IanHolman/library/UN1
Bellhousing for the UN1 is coming along nicely. Its eating manhours and machine time, but its still cheaper than tooling up to have one cast as a 1-off, which would still need machining...
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Re: The Superboxer, a new heart for the Silver Bullet

Postby 4x4 Bus » 05 Nov 2016, 22:04

very nice!
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Re: The Superboxer, a new heart for the Silver Bullet

Postby george2490 » 26 Nov 2016, 19:17

Bell housing done?
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Re: The Superboxer, a new heart for the Silver Bullet

Postby silverbullet » 08 Dec 2016, 13:46

Not yet, very nearly. Hit a couple of snags and had another machine breakdown, but I have now got the clutch shaft drilling done so it's close. Then rework the clutch slave bracket, drill the starter fixings, lighten it a bit etc.

Currently thinking about clutch requirement, working on 300PS & 400 Nm output to be on the safe side.
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Re: The Superboxer, a new heart for the Silver Bullet

Postby nicq » 08 Dec 2016, 14:59

Very good are you going to anodise it
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Re: The Superboxer, a new heart for the Silver Bullet

Postby george2490 » 08 Dec 2016, 21:33

Looking fwd to seeing the results
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Re: The Superboxer, a new heart for the Silver Bullet

Postby silverbullet » 02 Mar 2017, 17:23

I was grilled about this yesterday, all I can say is that it's "resting" and I have only just overcome the clutch hurdle...I am going to re-work the shortened Renault one to take a 228 VW friction disc (petrol splines), clamped by a very heavy duty cover form Weddle. Apparently the standard spline and hub centres are extremely strong, they just need more clamping pressure to handle more torque.
I might try and get a kevlar faced one to raise its temperature rating when slipped, but it won't be from Black Diamond, that's for certain. I have never dealt with so-called "professionals" who were so rude and patronising on the phone :evil:
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Re: The Superboxer, a new heart for the Silver Bullet

Postby silverbullet » 16 Nov 2017, 20:53

Progress! New clutch (385 lb.ft rated!) led to more bellhousing mods and clutch release mech work. I'll let the pics do the talking...ImageImageImageImageImageImageImageImage

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Re: The Superboxer, a new heart for the Silver Bullet

Postby DSM » 16 Nov 2017, 22:24

More please :ok
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Re: The Superboxer, a new heart for the Silver Bullet

Postby silverbullet » 19 Nov 2017, 17:01

Top suggestion from Chris Schimke at T3 Technique for fixing the clutch slave bracket (not at all easy to jig up, but its turned out well)
However, I cant use a T3 wbx starter because the coolant hose is now too tight against the solenoid housing :(
Good news is that a late Bay 091 starter fits and has the solenoid laying to the other side, so its well out of the way :)ImageImage

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Re: The Superboxer, a new heart for the Silver Bullet

Postby CJH » 20 Nov 2017, 19:57

Hi Ian

There are at least a couple of 'high torque' starters available for the T25, and they come with a mounting flange which would allow you to adjust the orientation of the solenoid to taste. I bought a WOSP initially - the position of the mounting flange wasn't right 'as delivered', but was easy to adjust.

Image

Image

Image

I actually had a problem with the WOSP, and while it was away being fixed I bought a Powerlite - that has a similar mounting flange, but with only a single set of mounting holes. You could drill more to suit I'm sure.

One of these two starters doesn't quite mesh fully with the flywheel, and I haven't determined which yet. To make it mesh fully it would mean thinning the mounting flange by a few mm. I'm sure a man of your calibre could do that, or perhaps even make a bespoke mounting flange to suit your installation.
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Re: The Superboxer, a new heart for the Silver Bullet

Postby silverbullet » 21 Nov 2017, 09:51

If one or the other is surplus, let me know [WINKING FACE]
I can't justify the cost of a WOSP on an engine that's really just an MV with a bit of extra drag on the belts!

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Re: The Superboxer, a new heart for the Silver Bullet

Postby CJH » 21 Nov 2017, 20:15

I'm hanging on to the repaired WOSP as a spare I'm afraid. I bought it originally from a someone on here, while I was still planning my DJ build. I'd heard that the higher torque would be good for the higher compression engine. I don't know how true that is, but I do like the higher spin speed and the more 'modern' sound that these unit make.
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Re: The Superboxer, a new heart for the Silver Bullet

Postby silverbullet » 21 Nov 2017, 20:44

Fair enough! I will hold out for a pukka late Bay Bosch 091 to turn up

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Re: The Superboxer, a new heart for the Silver Bullet

Postby silverbullet » 01 Dec 2017, 16:30

Well thats a pity! The roller clutch on the old Bosch starter wont clear the new clutch cover...
So, I will be shopping for a reduction-geared starter after all!Image

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