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  #11  
Old 06-09-16, 10:25
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metalshapes metalshapes is offline
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Swapping in the bigger engine.
And a radiator, new exhaust, etc.

( the engine swap was worth more than 5 sec a lap... )
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  #12  
Old 06-09-16, 10:29
Teddie2003 Teddie2003 is offline
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Quote:
Originally Posted by metalshapes View Post
Thanks Teddie.
Yeah, I got some good info off a Imp forum...

The swaps I saw there used the unmodified BMW Bellhousing mated to the Imp tranny with a adapter plate.
That gave them plenty of space to mate a Imp flywheel to the BMW clutch basket, and then bolt the Imp pressure plate to that.

I wanted to keep my setup as compact as possible.
The Hewland I have has a different case( not the regular VW based one ) with a removable ring on the bellhouse side.
With it its stock length, without its 2.25" shorter.
I then made a new bell that replaces most of the stock BMW bell, and it is more than an inch shorter.
And a milled a bit off the gearbox flange as well.
So I lost more than 3.5" in total length ( measured from the diff centerline) or close to 4" if I would have used an adapter plate, which should help with the weight distribution...

For the clutch, I modified a Quartermaster flywheel that was made for a 351W Ford, mated to a modified Tilton pressure plate, with a single 180mm sintered clutch disc that was made for a Formula V or a 356 Porsche, or similar...
The first installation that Clark did for the Imps modified the BMW length to go onto the Imp bell housing so that the overall length of the engine/tranny was the same.

Then he had some new shorter bell housing's cast so that the BMW didn't have to me modified each time and now I understand he is going to develop something else along the lines of a simpler adapter onto the Imp bell housing that will still mean the BMW doesn't have to be machined each time. But I'm no quite sure how that will affect the length of the set up.

"I then made a new bell that replaces most of the stock BMW bell, and it is more than an inch shorter." So does that mean you are using the hewland out of the BMW single seaters as they had the K1200 based engine?

"I swapped in a 1000cc engine out of a Autobianchi Abarth" so that engine gave you 5 seconds, is the K1200 stock and what do you think that will give you per lap?
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  #13  
Old 06-09-16, 10:35
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metalshapes metalshapes is offline
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No, I believe they had a later Hewland that was a 6 speed.
This casting I have was made to be load bearing in a Formula Ford.
I don't know who made it, but I got it from a Dutch Slalom racer.
( he used a supercharged 2000cc BMW engine and broke a tooth off 1st gear, so I'm looking for a replacement set for that... )
My engine is just a regular low mileage ( hopefully ) bike engine.
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  #14  
Old 06-09-16, 10:44
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When I put the 13" wheels on I had to narrow the front track, which didn't help the turn in.
So I widened it back to the track it had before.
(difference is, I narrowed it by making shorter a arms but widened it back out by putting spaces behind the wheels, also to help turn in )
So then I had to widen the front fenders.
And since I was doing that, I thought I might as well work a bit on the Aero...
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  #15  
Old 06-09-16, 10:45
Teddie2003 Teddie2003 is offline
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Quote:
Originally Posted by metalshapes View Post
No, I believe they had a later Hewland that was a 6 speed.
This casting I have was made to be load bearing in a Formula Ford.
I don't know who made it, but I got it from a Dutch Slalom racer.
( he used a supercharged 2000cc BMW engine and broke a tooth off 1st gear, so I'm looking for a replacement set for that... )
My engine is just a regular low mileage ( hopefully ) bike engine.
Still even if it's stock that should still be approx. 130 BHP for a Europe spec and 98 for US spec engine and I heard Clark chipped the one he has in the Clan and that gave an instant 25 more.

That's good to know about the alternative bell housing for a mk9, I'll have to look/ask around to find out who used to do that type of mod. unless one of the FF people on here knows anything about that.
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  #16  
Old 06-09-16, 10:48
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metalshapes metalshapes is offline
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The start of my new bellhousing...
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  #17  
Old 06-09-16, 10:50
Teddie2003 Teddie2003 is offline
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Originally Posted by metalshapes View Post
The start of my new bellhousing...
That's a fair bit of swarf!
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  #18  
Old 06-09-16, 10:51
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Do you have a way for me to get in touch with Clark?
I believe he is way ahead of me with K engine knowledge...
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  #19  
Old 06-09-16, 10:55
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Originally Posted by Teddie2003 View Post
That's a fair bit of swarf!
That was just part of it...
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  #20  
Old 06-09-16, 11:06
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Here is the part of the BMW bell I used, and the new bell before I lightened it.
I epoxied them together.
I can weld aluminum ( I have a Tig, and I weld aluminum quite a bit ), but I think I have enough contact area for a strong bond, and I didn't want to loose the heat treat in the aluminum ( apologies for the US spelling... )
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