BMW airhead salt racer — skrunkwerks skrunkwerks

6 Фев 2015 | Author: | Комментарии к записи BMW airhead salt racer — skrunkwerks skrunkwerks отключены
BMW R100RT Mono

airhead salt racer

salt racer rear end

T say you can’t be brave unless scared. Well, at least I’m way there!   The thought of tearing a granuley surface with spots’ at 220+ km/h is pause for thought so I want to the bike as stable as I can.

The GSXR750 forks will at the front end. They are shorter than the stock which will lower the and reduce the front projected and therfore drag, but the wheelbase also be reduced. Straight stability is improved with length but there can be a trade a swing arm with wheel on the end is effectively  a ‘pendulum’. The longer the the more sensitive the system is to slapping harmonics.

The swing arm pivot points be stiff enough to resist tendency.

At first I looked at and stiffening the stock monoshock arm but after lots of measuring, and thinking, I decided against it for the reasons:

Lots of work – for the R80 monshock bikes, to extend the arm, you can’t just add an block between the stock arm and drive because the wheel move away from the section of the arm causing a clash. So you to extend the tube within the part and would need to a good welding jig first to get right.

More work – extending the shaft. The shaft is hardened steel which, while not presents welding issues.

ratio problems. The longest drive BMW made for the Mono’s is or 3:1. Even with a 5% 5th gear, I’d most likely run out of even at 8500RPM.

  I’ll cover gearing in depth in a later post.

I a couple stock BMW gadgets solve all of the above: a R100RT arm coupled with a R100S drive coupled with wheels!

The R1100RT swing arm is a stiff diecast alloy and is 115mm longer than the mono item. It is a bit narrower at the than stock but bolts on to the airhead frame with its pins – bless BMW. considering the lost wheel due to the new front end, the final will be about 90mm than stock.

The R1100S bevel drive has a long 2.75 ;1 gear which will be about for the speeds I’m looking for on the salt.

while solving my biggest this arrangement has issues of own, the cheif one being wheel centerline offset. The R1100 rear wheel is wide (160) and presents a offset while the earlier 17″ wheel is narrower (140) and straight on – bless BMW again. But swing arm pushed all the way over to the offset is still almost

Of course, with the swing arm over, the gearbox output and drive shaft don’t up so I will have to move the to the right as well! This present any balance issues the gyroscopic effect of the wheels than make up. The torque of the transverse flywheel has a far greater and that doesn’t effect much.

I plan to take meat off the K100 hub which reduce the offset to around 5mm is where it will stay. A pin and a spacer will have to be to look after the large gap at the hand pivot.

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