moriwaki race bike

[compo z1r]

class bike ????? im' a regular at olivers mount what you in theres only 4 meets unless your inhill sprints c / o north , gold cup, or will it be sheeny fest, let us know cheers compo. ill come for a chat in paddock.

ps. have you seen steve elliott moriwaki taken 20 years to do.

[paulmceleney]

mark ive got another bike ready just needs putting together have to wait till i finish 1075 project may be next year i would like to know what engine work been done

[paul doran]

now that is beautiful

[Gus]

Cool Tool

What's the engine spec. or is that classified?

[grahamm]

thanks for the nice comments, it makes the year of grafting worth while !
as for the mill, its 1170 and any more and id ave to kill yer !! theres competition out there you know !re olivers mount, should be at the sheene memorial meeting hopefully, my rider is an old hand on big z racebikes - Nick Allison from jersey (not too old eh nick)
Graham

[Big John]

Lovely bike, looks too nice to race.

[DANNY.T]

Great lookin bike!
Job well done



_________________________________
z900a5-Z1R

[Murph]

Mmmmm really nice bud well done !
Must try to get to a meet i would love to see it being used in anger.

[phil churchett]

thanks for the nice comments, it makes the year of grafting worth while !
as for the mill, its 1170 and any more and id ave to kill yer !! theres competition out there you know !re olivers mount, should be at the sheene memorial meeting hopefully, my rider is an old hand on big z racebikes - Nick Allison from jersey (not too old eh nick)
Graham

Nick Allison eh? You'd best extend your trophy cabinet then!

[big green bus]

very nice

[Steve Cooke]

dont the brakes work better if the calipers are at the rear of the forks .or have you put them there to keep the front end down .

I can't see how the braking would be improved by fitting to the rear, but I can see more efficient cooling, hence better brakes by fitting to the front.

Lovely looking bike.

[tlc]

dont the brakes work better if the calipers are at the rear of the forks .or have you put them there to keep the front end down .

I can't see how the braking would be improved by fitting to the rear, but I can see more efficient cooling, hence better brakes by fitting to the front.

Lovely looking bike.

The reason later calipers were fitted to the rear of the fork legs was due to weight distribution in front of the steering axis.
It was felt that once the gyroscopic effect of the wheel was taken into account then the less weight in front of the steered axis the better for direction changes.

We all know about unsprung weight and the fact that less weight is better, but also any weight that there is should be placed as low as possible.

Cooling of the braking system is most affected by dissipation from the disc and as we know by the benefit of hindsight heat is required for disc braking systems to operate efficiently. (Carbon discs must be at 1000 degrees before they even start to work) Caliper cooling by air flow doesn`t really come into the equation as most heat is lost through caliper design and alloy constituency. If they required airflow we would have airscoops like old 4LS drum systems that reached their maximum design capacity and necessitated the change to disc brake systems.

It is possible that race team calculations were that losing weight from unsprung components or reducing wheel diameters could be offset against the inferior mounting of brake calipers so high / forward when the original design was further back / lower down.
It should also be considered that these bikes were entered into many Endurance type races and that forward mounted calipers may have been beneficial to rapid wheel changes ?



Oh, and by the way, nice bike Mister. Wa`ll it do ?

[Steve Cooke]

Hmmm! I can't say that I agree with some of that Chris,the weight distribution yes, but the cooling no, for one we are not talking about carbon discs so that is irrelevant, and while not professing to be any sort of expert on the subject it does make me wonder why i've made in excess of 500 pairs of glass fibre air scoops for various formula race cars to enable direct cooling of the braking system?

[tlc]

Steve. This is taken from a Technical article published in a contemporary Bike magazine.

The classic problem with drum brakes is fade, a situation which arises from their inability to disperse heat during sustained applications. As the temperature rises, the friction coefficients drop,reducing both braking power and the self energising effect of the leading shoe design. More physical effort is required to restore braking which will then lead to a further increase in temperature and consequently fade. The vicious circle will continue until no more braking is available. Discs overcome this problem much more effectively because a greater area of disc is exposed to the air at all times and avoids extreme temperature build up.

Pads :
Being mainly metal, the pads conduct heat efficiently from the disc to the caliper piston - not a good idea as resultant brake fluid evaporation would produce spongy brake action. To counter this, Dunlop supply thin insulator gaskets to prevent heat transfer from pad to piston. On some of the pads these are glued to the back of the pad to form an integral unit, but on others they are seperate items, specially designed not to fall out of the caliper. The insulators used at the moment are made of asbestos based materials sandwiched into a thin gasket but other materials are being tested for future adaptation.

Kawasaki have also recognised the problem of heat conduction, but have reacted to it slightly differently. They have built the insulator into their caliper piston by fitting it to a cup shaped insert which is peened into the cylindrical piston.


What I was trying to say in my first post on the subject is that heat is good, but excessive heat is not.

[compo z1r]

hi' grahamm just found these from this years sheeny fest. hope hes' a good rider' [ nick ]. got grant'y to sign my z1r owners manual.