New Busa FNR Chaincase design

[buggyfreak34]

Cool, lookin forward to following *the R & D.

[yoshi]

Originally Posted by masterfabr\";p=\&quot

Busas use a cushion drive in their rear wheel to soften impacts to the chain so why not me to soften impacts to the geartrain?LOL!!!!! *

I've been wondering the same thing for a while now, i'm in the process of running a cush drive on my rails to take the load off the gearbox of both the motor and the FNR. *My buddy buddy custom built one for his drag bikes years ago and showed it to me at his shop, and i'm for the most part gonna copy his setup. *It's a 3 piece sprocket that bolts on in place of a regular sprocket, pretty cool little setup and he says it has a really plush take off feeling....

[masterfabr]

Yes that's easily done on an exposed chain and will be an option later for those that want a lower cost trans i.e. exposed conventional primary chain. That's not my desire so the initial units will be fully enclosed,silent chain,oil bath units.An exposed chain setup will initially offer more available ratios.That will be a little further down the road however.THese initial prototypes can be either 5.85:1 or 5.35:1. The first 2 will be 5.85 to allow a 31" tire with a busa to run approx 100 MPH top end.Fast enough.

[Freezedried]

Masterfabr,

How is the progress of the FNR going? How did your castings turn out?

[masterfabr]

Long story made short.Castings should be to me in the next 1-2 weeks now. Progress has been slowed with the realization that the VMC won't fit in my building. *[smilie=banghead.gif] *Oh well that just means the 48X60 shop addition will happen MUCH sooner than planned. Hope the rain goes away so I can pour footings and the machine isolation pad this week.The floor pours sometime the next.THEN the machine is due to arrive. [smilie=banghead.gif]. Yeah,that's right,BEFORE the building is built.Gotta build around the machine now. If it isn't one thing that slows progress it's another, ya know? Currently the foundry is trying to cast from Tensalloy (sp?) Having a little shrinkage problem and may need to change to 356 T-6. Tensalloy is tough and able to take a sever hit without fracturing and needs no heat treat prior to machining and therefore is less expensive.356 on the other hand is easier to cast but requires heat treat and straightening before machining ,is more brittle and more costly.As soon as the castings show up I'll update on the final alloy.

[bdkw1]

The horse before the cart? *


A357-T61 * *Hipping also works wonders on castings if porosity is a concern.

[masterfabr]

Bassackwards as can be huh? The foundry I'm using does some pretty nice stuff.I'm pretty sure they'll get me taken care of.Some things I just have to put faith in the people I choose. And then hope I chose right!

[bdkw1]

Any chance of getting them to low pressure cast them?

[masterfabr]

That's not the problem. Actually there has not been a problem at all.Just some concerns about a couple of places as far as a POSSIBLE shrinkage issue. *I actually have a foundry right here in town that does pressure casting and ironically they'll be making the matchplates later.

[masterfabr]

The first 2 sets of castings are being cast from the double shrink sized patterns to do prototype testing.If all works out well then the matchplates will be made from the double shrink wood patterns for final casting sizing.