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V-Twins in Featherbeds

Re: V-Twins in Featherbeds

Postby acotrel » Wed Mar 26, 2014 12:28 pm

Rohan wrote:C'mon, thats the famous JAP 8/80 Race Engine.

Can still buy them new.
Cameron Racing Engines, Greg Summerton and the late Bob Jolley could all supply them.

http://cameronracingengines.com/esite/jap_880_1000cc
http://www.eurospares.com/greg.html


I watched Bob Jolley race the 880 JAP/featherbed at Winton some years ago. It was OK, however seemed to pull harder than it needed to, with not enough top end. The Norvins were better at the time, however none of them would be a pleasant ride. It makes a big difference how far forward you can get the weight with a featherbed framed bike. The bikes in the photos look great, and in theory should be good to ride. However the practice sometimes doesn't reflect the theory. It is never as simple as just fitting a motor into a frame.
I can remember a time when I found it impossible to get a respectable lap time with my short stroke Triton. I moved the motor forward until the front engine mounts touched, and the bike stopped feeling vague in corners. That restored a bit of confidence. I look at some of those photos and recognize the potential for getting a hard time. I crashed a lot when I was a kid.
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Re: V-Twins in Featherbeds

Postby ashman » Thu Mar 27, 2014 4:32 pm

Over the years I brought a brand new 91 1200 Sportster , but only had it for 3 years, I liked the power of the 1200 but a HD was just not my bike, but the last year or so I have been thinking about what it would be like to put a 1200 Evo motor in a Featherbed, be a lot lighter than a cast iron motor, I have a spare Slimline Featherbed all I need is to find a cheap 1200 Evo motor :roll:

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Re: V-Twins in Featherbeds

Postby Matt Spencer » Fri Mar 28, 2014 4:55 am

Image

Reading a antique book on J.a.p. , well - 1952 - says the twin good for 95 Hp . :D :twisted:
The Japanese response to ' styling ' , was to add more .
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Re: V-Twins in Featherbeds

Postby acotrel » Sun Mar 30, 2014 11:37 pm

Really depends on how it is set up. If it is nice and torquey with high gearing , and a close box it might be quite good. If it is savage with wide box, and not so high gearing, it could give you a really hard time. The problem comes when you are cranked over going really quickly in a bend and have to change gear or it drops off the power band because you have backed off too much, and you have to slip the clutch to keep it going. A bike like that is capable of tying itself up into a knot, and launching you. A 95 BHP featherbed V twin is not a kiddies' toy. I would ride it, however I'd be very careful if I started to get inspired.
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Re: V-Twins in Featherbeds

Postby Rohan » Mon Mar 31, 2014 12:31 am

95 hp sounds rather optimistic, to say the least.
JAP claimed 80 bhp - thats where the 80 in 8/80 comes from.

Do race high-compression JAP twins have a 'powerband' ?
The expression 'pulls like a train' comes to mind.
There are published dyno charts for these as the earlier versions,
and the torque curve is pretty strong.

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Re: V-Twins in Featherbeds

Postby Matt Spencer » Mon Mar 31, 2014 7:01 am

This is a photocopy from a old Aussie magazine . Stated the bloke finished it and got killed on a Honda on the Highway . The waywardness of the early Jap fours in comparison - you takes your choice . A Z wotsit flug its rider at the Sheene thingo .

Image

Generally someone with the patiance to assemble suchlike isnt so exciteable or wayward , perhaps .
The Japanese response to ' styling ' , was to add more .
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Re: V-Twins in Featherbeds

Postby Matt Spencer » Mon Mar 31, 2014 7:06 am

Seeing were there , :twisted:

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The VINCENT importer in N. Z. stated that with the standard bottom end ( components ) 90 Hp was Max available Hp , and good for 160 mph . in these suckers .

Image

Allan Nash on the left, Pat O'Keefe on his Norvin and Barry Howell on the right at Church Lawford sprint in 1962.

Image

Then Again , theres some debate as to wether you actually need a frame .

Image
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Re: V-Twins in Featherbeds

Postby acotrel » Mon Mar 31, 2014 1:00 pm

This has not got a featherbed frame and you need a MotoGP bike to beat it :

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Re: V-Twins in Featherbeds

Postby Matt Spencer » Tue Apr 01, 2014 10:25 am

The Japanese response to ' styling ' , was to add more .
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Re: V-Twins in Featherbeds

Postby Matt Spencer » Tue Apr 01, 2014 10:34 am

Conical Hub ( BSA / TRI ) in ROADHOLDERS . Image
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Re: V-Twins in Featherbeds

Postby chasbmw » Wed Apr 02, 2014 3:07 am

Rohan wrote:C'mon, thats the famous JAP 8/80 Race Engine.

Can still buy them new.
Cameron Racing Engines, Greg Summerton and the late Bob Jolley could all supply them.

http://cameronracingengines.com/esite/jap_880_1000cc
http://www.eurospares.com/greg.html



The Cameron JAP engines are really quick, they are often put into Morgan 3wheelers used in Hill climbs and historic Racing, watching 3 wheeler Morgans racing on hill climbs is about as exciting as it gets. There probably will be some at the Presscott hillclimb Bike day next weekend. the Cameron JAP engines are not that standard, Boyer ignitions and twin plugged, running modern motorcycle tyres, gives them quite an advantage in Historic racing.
Charles

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Re: V-Twins in Featherbeds

Postby Rohan » Wed Apr 02, 2014 4:25 am

Hokey smokes, thats also a Norton plunger frame.
Lottsa horsepower would be interesting if pushed hard. (no damping on the back wheel)
It is a road bike, we notice... So rather a neat special.

Image

Also not clear precisely what model of JAP that is. ?

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Re: V-Twins in Featherbeds

Postby nickguzzi » Wed Apr 02, 2014 5:17 am

For the Greg Sommerton version
http://www.eurospares.com/greg.html

Also has links to a video or two of the engine working out in a speedway sidecar outfit against jap 4 competition.
In there somewhere is the replica-ish of a Norton works 4ls front brake which outraged a few on here a day or two back.

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Re: V-Twins in Featherbeds

Postby Matt Spencer » Wed Apr 02, 2014 5:36 am

" Also not clear precisely what model of JAP that is. ? " its a HONDA ! cant you tell ? :twisted:

Image

saw saying 12.7 yesterday . Should hope it could do better than that . http://reddevilmotors.blogspot.com.au/2 ... print.html
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Re: V-Twins in Featherbeds

Postby Matt Spencer » Wed Apr 02, 2014 5:43 am

" 1000cc model 8/80 JAP powered ex-Len Burman speedway sidecar to readily outspeed some Japanese classic sidecars at the Gillman June 2012 Winter season outing. " :lol: :lol:


http://supersan.net/videos/tr/video/hk5 ... e-Classics

& now for something completely differant :?

Image
cor etc . neverends
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