tisdag 28 februari 2012

Färnsjörepan - ToBeOrNotToBe???


Let´s see what this old rusty piece of iron can do on the ice strip at Färnsjö 3rd of March but it´s unsure if the race will be on or not. If not we will hopefully race the ice at Ältasjön 10 March, next weekend.








The ice looked good last Sunday at Färnsjö (40 cm), we can only hope it last one more week . . .

fredag 24 februari 2012

Modified Carrillo 8" inch Hardened Steel JD Rods


After some inspection of the new Carrillo rod´s i soon realize theese are partly heavy hardened. At the bottom end the file was doing its job, but on the top it was like worst hardened 4340 alloy. So the modification have to be made by grinding. Ill guess it will take me 2 days to reach the structur wanted. Also the flywheel need to be modified as well as the cylinder skirt to let the rods go free.

The material is a proprietary material made specifically for Carrillo called CarrilloLoy. It is similar to 300M and 4340. The shot peen is a proprietary blend made for super fine shot peen finish. The bushing material is called ToughMet. It is more slippery, elongates less, and is tougher than any material short of composites. The rods are comparable in weight to the Lightning rod but have 38% more surface area.

Terry at Shaker Products say´s "As far as strength data I can say that we used 4800 psi cylinder pressure as a standard threshold. 4500 psi in a top fuel car's cylinder. I have had a new Nitro bike owner break his crank pin on a backfire and the Shaker Rod still is straight in the beam".

Dimension Data:
Center to Center 8.0"
Pin Diameter honed for.927"
Big End bore for 1.5" crank pin using standard big twin rollers
rod width on small end 1.060"

Now we talking part VI

onsdag 22 februari 2012

More steel from over there . . .



Some modifications and these 8" inch long Carrillo rods will last for ever in my JD stroker. . .

lördag 18 februari 2012

Follow Brooken Spooke across USA

Follow Brooken Spooke across USA in September at the new website.

You will find daily updates and live streaming video later when the event comes closer.












www.brokenspoke.se/cannonball2012

CORAWF-Chucks Offset Rocker Arms Works Fine


video

onsdag 15 februari 2012

Roffes Motor Stockholm / Raceway AB


Roffe started sell motorcycle parts in Stockholm 1943 and the biz are still alive by new owner today. I remember when i was 12 years old 1970, buying parts to my mini bike from Mr. Rolf Senior him selves. Even Mrs. Rolf and their son Leif was working there at the time. The hot dogs cost $0.05 USD and a coke even less. Leif was still active last year when i meet him buying some flathead pistons for the JD.

This famely has really meant much to motor cycle riding in Sweden. The new owner runs the biz with excelent service and know ledge about parts and machining. Peter what care for the shop does an eminent job giving every customer 100% attention to solve their needs or problem, even when there is 20 people in line he give all customers the needed time for optimal service. 















Link to: Roffes Motor Stockholm

Ronnie makes everything so easy . . .


Here, is a 4 mm thick alumnium plate, build an air filter for your bike.

Ehhh? hmm - ok?!!

So you canot use it as snow blower anymore . . .

2 minutes later he was attacking the metal by a tiger saw.













1 hour later we had an air filter mounted on the bike.

More nice metal from over there . . .

Offset rocker arms. The rumor says its easy 2 hp to get by these. We will soon find out, if they are true they will for sure bee needed in the battle of speed on the ice.

måndag 13 februari 2012

Some new nice iron from over there . . .

We will build some more strokers infor the racing seasons.


Mr: Osborn are also producing some real nasty wheels for us now what we hope to get our greasy fingers on soooooon . . .







Also the old flaties wants new valves and pistons. These original Harley parts are still to find from storage from the 70ties att Roffes Motor Stockholm.






POETRY!
Essence of life !

RPM

video

Tire lock and rubber . . .

After 4 flat tires i found out i have to use a tire lock due to heavy grip in ice. Also the new nails was carwing thrue the rubber when they gets pushed into the tube on asphalt. I mounted a thick rubber line inside the tire, this looks to work fine.

tisdag 7 februari 2012

Finally, you can throttle up on the ice . . .


These ice nails will do the job this year instead of the lousy one used last year. After some races on the ice i had to go picking em up along the ice track. These are really heavy nails due to a special wide thread and hard metal core. This special thread makes the nails grip better in the soft rubber and will not popp off. I first saw them on a 4 ton tractor what was driving hard on booth asphalt and ice and they looked as new after many months driving, and almoust none had popped off.


We will sell the "Best Grip" nails at the track and maybe on the blogg also, depends of how much interest there is. Let us know if you want many of them and we can arrange for a delivery, but smaller quantities (less then 400) will probably only be sold at the race tracks.
Mail me if you want to order: valand at brokenspoke.se

I mounted them with a drill, it took 2 hour to add on 456 nails in 2 tires. It was a little bit hard to center them but after 100 nails you got it right. The technique is to press hard from start and compensate for the oscillation effect when the flat blade tip is off center. Its also hard to stop at exact right position when using a drill, some times i had to back up the nail caus i drow it too deep. These things will of course affect the quality and lifetime.
I now also read and look at the professionals working with these nails, threre is one hand tool also what will give the optimal control when setting the nail in the tires. This will of course take 10 times longer but you will get a better quality/lifetime/function when all nails are fixed at the same height and center of the position you want, with the drill you will not have that 100% control. Ill guess this will work fine anyway but some lost is allways with non exact mounting of the nails an of course affects the wheel balancing at high speed. I now got 199 nails on the back wheel and 266 in the front. With the sidecar its much pressure on the front wheel sidways what often results in a wide and long curve instead of a thight and fast. Now ill hope i will be able to make real close turns with good speed. We will soon see, ill guess it will be possible to do the first test ride this weekend, if i have the time to switch tires and serve the bike. Or is it more a question of attitude? Ill know i will race the ice this weekend.

Anyone up for a challange?