There was a twin Imp engined motorbike shown at the Derby National Weekend.
Tim Greantham-Hill in Belgium built a motor cycle using an Imp engine. He took it to the English car Rally at the Euro Circuit.
Years ago there was a 'cut-open' picture of mr. J. Schofield's NorImp (Norton-Imp) in Impressions. See also photo 123 in Apex.
The Bettson V8 has two race-tuned 998cc Imp engines. It is said to be very quick!
Every so often one hears of motor bicycles that were treated to an Imp engine... On a few of those I received addictional information:
In October 1966 Victor Phillips took a 998cc Imp powered motorcycle/ sidecar combination to a British National Record of 119.86 mph for the flying quarter mile. The next day they averaged 97.32 mph over a two way run (an average of 36.99 seconds improving the record by almost two seconds)
From: "ken horwood"
Date: Thu, 31 Jan 2008
Back mid 70s I built an imp engined solo motorcycle. I used a Norton wideline frame, Norton commando clutch, & Norton gearbox. Plus all sorts of other parts!
To keep the engine weight symmetrical I used a countershaft supplied by a guy in Bristol called Stoke Gifford Engineering.
I rode the bike all over uk & Europe, mainly to bike rallies & sold it in 1979.
I never heard of it again & presumed it was scrapped. Then some years ago I was waiting at the docks to cross the channel & there it was!
I told the guy riding it I Made That! He looked baffled & off we went.
A few years later I was at the docks again & there he was. I checked the DVLA entry for VPU4S Norton today
http://www.vehiclelicence.gov.uk/EvlPortalApp/ vehicle enquiry
& it is still taxed!
Not bad for a 31 year old homemade bike.
I have pictures if anyone is interested.
I can also write a lot more tech stuff about it if needed,
Notice the extremely professional looking 'one of' casting to drive the Imp camshaft off the end of the crank. I was able to talk to the owner briefly at the time and he told me that it retained the standard Norton/Lucas alternator and Prestolite starter motor. The rear brake/ gearchange levers had been transversed so they are the 'proper' way round again as on earlier Commandos, although the Mark 3 hydraulic read disc brake has been retained using a special rear brake lever/ master cylinder arrangement.
It would appear to be fitted with twin Stromberg carburettors and some kind of sump extension to help with oil cooling. I did hear it running if a little muted through the single Norton 'bean can' silencer.
The big question is of course, where is this bike now ? Does it still exist?
(Copied with permission from Malcolm's page on bike stuff - no longer in existence)
At National Weekend 1991 there was an Imp-engined BSA motorcycle combination. This had been prepared by Tim Berry (member of the Bath & Bristol area centre).
The Limpet is a racing motorcycle sidecar combination with a Hillman Imp engine.
The Impressions article by Tim Reshaw has an x-ray drawing, a photo and graph (x = rpm, y = power (bhp corr.))
Coil & distributor
12.1 : 1
inlet: 1.4; exhaust: 1.125
2x Weber 40 DCOE
R.P.3 (lift: 360; 50 80 80 50)
Twin front single, rear 8" discs;
single drum on sidecar
Aeroquip (all around)
Norton 4 or 5 speed box
purpose built G.R.P.
113 bhp @ 8,500 rpm
Doug Smith: "Hi, I was surfing on the web and came across The Imp site, and especially, an Imp-engined Norton motorcycle. Mention was made of a sidecar outfit which reminded me of one called 'First Impression', which I saw about 1979 at the B.M.F. show in Peterbourgh.
I still have two colour photos of it, which I will send to you if you are interested."
17 - Nov. - 2000
Another Imp bike, again pictures and info supplied by Doug Smith.
The Imp-engined chopper was featured in issue 164 of Back Street Hero's, a custom bike magazine.
According to the article it was built by a guy called Simon Thaxter.