Vintage Road Racing Association

Hello Guys
I see in the rules that in P1 sidecars Honda CB450 motors must remain stock with stock carbs, can the motor be modified to run in P2 with 34mm carbs

just asking

Allan
#393

Being a Honda guy, I looked at this option for my P2. Yes you can modify the CB450 twin for P2, and use up to 34mm carbs. However, it will likely be 2 /1 more expensive to build than an XS from what I found out.

thanks

what part of the build would be twice as much, building the motor or the chassis ?
I'm assuming you're talking about the motor? wouldn't the chassis for the XS motor be relatively the same for a cb450 motor , they are pretty much the same size , no?

Allan

You would be underpowered in P2 I think
XS 650/750 can make well over 60hp for little cost to reliability
and also little money.
and Besides... BMW's win
Chassis is the hard part to find start there.

definitely underpowered stock

but a built motor , like the one I had in my P-1 500 2012 Championship winning bike would be legal to race in P2 sidecar
thanks Matt

Allan
#393

What is going on in that squirrely head of yours, Lylloff?

aly393 wrote:definitely underpowered stock

but a built motor , like the one I had in my P-1 500 2012 Championship winning bike would be legal to race in P2 sidecar
thanks Matt

Allan
#393

If you don't already have a line on a chassis PM me.

Come on Allan, think outside the box.......

2 x CB350 (40+hp) engines keep you inside the displacement limit!

I don't know about 2 CB350 motors in a hack, but if I can find them, I have some photos of a hack that was raced in Europe in the mid-sixties with 2, CB72 full chat racing motors in it. As I recollect, the trannies had been cut off and they ran to a common jackshaft and then to a Brit gearbox.
There was another crazy mid-sixties hack in the UK that was running a CB450 motor with the tranny cut off and the cylinders laid forward until they were almost horizontal - again, photos somewhere if I can find them.
But why stop there? Why doesn't someone build a replica of the 3 wheeler that had an Austin Mini Cooper 997cc motor in it and won 'til it was outlawed? Maybe the 2 wheels in the front would throw a few people off, but WTF... legal as far as I can tell by the rulebook.
There was also a Sunbeam Imp powered hack too, but what the hell, probably way too far out there for most of you guys and anyway, if you've ever spent an afternoon figuring out shim thicknesses for a high lift cam on an Imp and getting most of them wrong like I did, something I wouldn't wish on people I didn't like, let alone friends...
All of the above lend credence to the oft repeated phrase, "Give an Englishman a piece of metal and he'll do something funny with it".
Maybe P1 sidecars is "the place" to be in 2014?
Pat

There are at least 3 Imp powered sidecars currently racing in the UK today. One came 2nd in the Classic TT this year.

All of the above lend credence to the oft repeated phrase, "Give an Englishman a piece of metal and he'll do something funny with it".

Damn.....I think I was that Englishman today.

Miles

Since I don't get here very often I am late on responding here.
The 450 may be underpowered compared to an XS or BMW but if you ride all out as though you were racing a F125 and on tight courses it suddenly becomes competitive. If anyone knows Johnathan Spinny from the USCRA that is his style and motor. As a passenger this makes for a wild ride.

Hey allen,
What IS going on in that head of yours!!
You gunna be a P2 noob with evie and I this year?

I think I know of at least three new p2 rigs this year! A local kenosha friend bought a v7 guzzi based rig from the east coast and is trying to figure out who is gunna monkey it. (roger...)