Hi Guys,
I am building a new vintage trackbike for myself over this winter, which I will be using for trackdays here and there and some endurace racing in Oschersleben.
Will be based on a K7 engine (standard cc - mild tune) and frame, ignitech ignition, CR carbs, alloy tanks and wheels, glasfibre seat, forks and axles to be decided ( leaning towards f1 rear (spoke/disc) and updated GL1000 front with AP or cbr calipers and cbr axles....
Anyway.....
I was wondering what the racers out there prefer for their bikes in terms of exhaust system (4-4, 4-1, 4-2-1, 4-2) ?I am under the impression that although the street bikes and the CR750 use a 4 in 4 exhaust, actually a 4-2-1 system (triple Y) would be the 'best' system for allround performance for a 4 in line race bike that races circuits ? Reason for this I see it (4-2-1) most widely used on other (fast) vintage 4 cilinders on the racetracks in Europe ( so this motivation is both good and silly
)
For example I don't know if in a mild state of tune engine there's a lot of difference between using a 4-1 compared to a 4-2-1 ?
I do know there's different exhaust configs preferred for different racing ( drag - track - oval ).
I will race mostly on racetracks in Europe like Zolder, Assen, Oschersleben etc.
So tracks with a lot of bends and some straights, so I am looking at a good allround system, not merely tuned for all out power.
Can anyone tell me which system they prefer and why, preferrably form first hand experience ? ( racing yourself on racetracks or road ).
Also love to hear which suppliers you prefer in terms of exhaust systems, as I see sometime pipes cut open that simply look awfull inside in terms of welding and finishing.
Also it needs to be a system with a muffler ( or to which I can fit one), as most circuit in Europe have noise restrictions.
If I need to do some fabrication I don't mind (can weld stainless in house so fixing a muffler or an hanger is not the issue). But I do not want to build a full system with all joints myself.