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1133
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12/20/2012
Location
Wolf Creek, OR
US
Edited Date/Time
5/11/2016 3:12pm
Rather than being limited to 450cc, what size motor do you think most of the teams would run in the nationals? I mean if there was no limit at all.
Also, would any of the factories develop/run a two stroke (for said open class)?
I, personally think that they are getting about all the power that can be used out of the 450's, and I doubt that anyone would go much, if any, bigger.
As far as the two strokes, I think it would depend on the weigh limit, or lack thereof.
Thoughts?
Also, would any of the factories develop/run a two stroke (for said open class)?
I, personally think that they are getting about all the power that can be used out of the 450's, and I doubt that anyone would go much, if any, bigger.
As far as the two strokes, I think it would depend on the weigh limit, or lack thereof.
Thoughts?
I would say 500cc 2 or 4 stroke would be max efficient displacement. I personally dont like the idea of opening the multi-cylinder can of worms.
The Shop
TC 125: 192.7lbs. without fuel.
TC 250: 211.2lbs. without fuel.
FC 250: 217.8lbs. without fuel.
FC 350: 221.3lbs. without fuel.
FC 450: 223.1lbs. without fuel
Reckon they can find 10 pounds?!
Still, a twin? It would never happen.
I'm a bit tongue tied with the blokes name right now - a Surname starting with B, and quite a Pommie one ( and that, he is), who ran various Belgian MX series , and may still do so, for some time after retiring. I remember reading an interview with him and him saying it was the best engine he ever ran.
One of our Brit contributors here should have a better memory of his name. Was he Chris Burnham?
I'd love to see an Open Class. Just naturally aspirated engines as a limit. I think around the 400cc size for 2ts could be the sweet spot for them, and, I'd welcome a return of genuine grunt, with big capacity 4ts, made 'minimally'. A smaller version of the JBS Racing M1, is what I'm thinking of. Modern weight saving techniques could bring 600+CC 4ts back with a few small manufacturers, and perhaps a big manufacturer. I've read / heard several times from riders of the 600/ 650cc 4ts that the engines would be more than competitive with modern bikes, it's their weight, old geometry and suspension that would just need to be sorted. I'd love to hear and see a variety of engines out there, instead of just the cookie cutter, blarping scream of high revving 450 4ts.
Won't happen though, we can't even get 300 2ts in the 4 stroke handicapping class. It's just a piss poor situation.
His name eludes me for now
Pit Row
700cc 2 stroke. You know someone would do it.
It was about the use of downsized CR500s, by a few privateers.
I've seen people lay creedence to Budda - that's not Gary Benn by the way , Jock - saying Leisk was on a 400. I truly don't believe it. Mind you, the difference in revs he used in his first European Moto at Valkenswaard, in '89, when he ran out of petrol whilst leading, was like listening to a 400, as against the far lower revs he used in the second moto
The very first EXP 400 'experiment' was based very closely on the ancient old 500 - just downsized and still with a carb. Rapidly, it became a very, Very exotic thing, with no relationship what so ever to the CR500 :
This patent drawing is, I think, the basic reflection of the above pictured engine :
But, I have this patent drawing stored, labelled as an EXP2 engine as well:
Honda, have / had so much 2t technology they just left behind. At least a bit of the more basic EXP / AR (Active Radical) tech was used on the production CRM250ARs, for a few years. Here's a CRM250AR / AF project:
It's funny how easily rules can be / well, were changed, when the main players see something as no real threat to championships they cared about..
Case in point : the rapid allowance of the Aprilia V Twin in GPs (and SM and World Enduros) a few years ago. Many, many years after they were banned from MX after the appearance of Honda, Yamaha and Aprilia Twin Cylinder 2t prototypes, on the grounds of cost and complexity. Pity they didn't think about that with the 4t Handicap classes. . The Aprilia's were neat to see, and hear, and, I'm pretty sure it made for quite wonderful pay days / retirement funds for Josh Coppins in the GPs, and Stefan Merriman in EWC / WEC. Not sure if Alfie Snow(?), a young Brit, ever got much of a wage from it - he's the last one I noticed using the V Twin Aprilia. I think I've seen his name in the MX2 or EMX2 entries. recently.
That bike dominated Supermoto for quite a while.
but like another poster mentioned above... heck, even a 125 x 2 smoker would probably be too much... an easy 80 hp.. and while I wouldn't want to work on a twin, if money was no object and you are looking for max power, they would be the way to go...
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