Author Topic: A10 powered Sunbeam  (Read 164 times)

Online Greybeard

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A10 powered Sunbeam
« on: 14.07. 2019 12:10 »
One of the comments on Facebook:
"BSA twin put in sideways !! What a job ! Dnepr twin leading shoe front brake... a marvellous piece of engineering!"
And:
"It's using a Dnepr rear wheel and drive"

Offline RichardL

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Re: A10 powered Sunbeam
« Reply #1 on: 14.07. 2019 13:39 »
I hate to think about what's involved if you want to make a little tweak to the clutch.

Richard L.
Plan on signing up for the world-wide 2017 DISTINGUISHED GENTLEMAN'S RIDE on September 30, 2018. Watch website at https://www.gentlemansride.com for details.

Online morris

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Re: A10 powered Sunbeam
« Reply #2 on: 14.07. 2019 13:44 »
That rearward facing cylinder will be difficult to keep cool  *smiley4*
'58 BSA A 10 SA
'52 BSA A 10 Plunger
'55 MORRIS ISIS
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Online JulianS

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Re: A10 powered Sunbeam
« Reply #3 on: 14.07. 2019 13:59 »
Seen at the BSAOC Open Day 2016 at Market Harborough.

Online Triton Thrasher

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Re: A10 powered Sunbeam
« Reply #4 on: 14.07. 2019 14:19 »
That rearward facing cylinder will be difficult to keep cool  *smiley4

He seems to have got there.

Offline Swarfcut

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Re: A10 powered Sunbeam
« Reply #5 on: 14.07. 2019 16:11 »
Well I'm well impressed.
 Must have built the bike around the engine and gearbox unit.
 How any access to the timing cover is obtained does not look easy, but I have to admire the clever sandwich plate for that front engine mount.. also the adaptor plate between engine and box.

 Shows attention to detail, finely executed, and on the subject of a recent topic, the breather arrangement takes a starring role....

 Well done.

 Swarfy.

 Additional...The non standard rear drive gear may be a bit more rugged than BSA's original worm gear.

Online RDfella

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Re: A10 powered Sunbeam
« Reply #6 on: 14.07. 2019 16:25 »
Great job, but how long will the transmmission last? BSA de-tuned the Sunbeam's meagre output to help make that last.
'49 B31, '49 M21, '53 DOT, '58 Flash, '00 Firestorm, Weslake sprint bike.

Online Triton Thrasher

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Re: A10 powered Sunbeam
« Reply #7 on: 14.07. 2019 17:41 »
Great job, but how long will the transmmission last? BSA de-tuned the Sunbeam's meagre output to help make that last.


Are you worried about the original worm final drive that’s not on it?

Online lawnmowerman

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Re: A10 powered Sunbeam
« Reply #8 on: 14.07. 2019 19:02 »
Bit of a myth about the fragile rear drives on Sunbeams. Martyn Bratby has built a "Fourbeam" and it is coping fine with the staggering power from two Sunbeam engines https://www.youtube.com/watch?v=eB8zRa1SdU0
The problem was that Sunbeam recommended Hypoid gear oil in the rear drive which rots the bronze worm wheel. Castrol D or even Castrol R is much more suitable.

Jim

PS the last time I spoke to Martyn he is planning to upgrade to a "Sixbeam" but it will have a Guzzi rear drive.
1959 A10 SR
1938 Wolseley 14/60
1955 Ferguson TEF20 tractor
1965 Ferguson 135 tractor
1952 Matchless G80 rigid
1960 BMW R60
1954 Matchless G80S
1955 Ariel 500 VH
1951 Sunbeam S7DL
1960 Matchless G12 with Watsonian Monza
......and loads of lawnmowers

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