fishi wrote:then let us speak in future about the right termination of these cranks !!! :::
Standard AF-Rayspeed Race crank is: AF crank
RB AF.Rayspeed Race crank is: AF High-Performance crank
fishi
PS: joder, que soys unos inutiles !!
Then there's 3 different AF RB crank...
RB20 = 58 x 116
RB22 = 58 x 107
RB25 = 60 x 107
For the RB20 I suppose Indian webs with a 115 Yamaha rod is an option but I'm not sure how the 115 rod affects port timings or whether you'd need to take something off the cylinder base?
Longer conrods are supposed to give less vibration. They were able to find an existing 66mm piston (Yamaha Blaster) that was suitable. Maybe they didn't have the piston option with the other kits? Just a guess really.
corrado wrote:Longer conrods are supposed to give less vibration. They were able to find an existing 66mm piston (Yamaha Blaster) that was suitable. Maybe they didn't have the piston option with the other kits? Just a guess really.
I'll speak to Martin at Chiselspeed when I get a chance. He's good with race cranks and can change rods and bearings as he's got the correct equipment for it. I have got a 58 x 116 crank with Indian GP webs and Maz conrod but it has no big end shims although there appears to be enough room to fit them. I'll get Martin to have a look at it.
'Borrowed' this from Cam Lam site re their Super Crank ....
The longer conrod length ensures a smoother, more balanced, and slightly higher outpur in terms of performance, and is out preferred crank conrod length
Tested to 12,000 RPM, but the biggest benefit of the Super Crank is its far superior balancing. Due to unique balance and weights, the Super Crank is smoother and more highly balanced then any other Lambretta crank we know of. Please read further down for percentage balance weights
Forged Con rod: Accurate machining and treatment with larger tapered passages for a proper lubrication for all moving parts & Nickel plated.
Pin bearing: large small ends pin bearing which better support the load. High racing quality big end pin bearing with silver cages and removable pins (18 instead of 16).
Crankshaft: Forged and hardened steel, which are then accurately machined, and balanced according to application. These cranks can be supplied balanced to suit different con rods and pistons. The balancing is obtained by proper inserts in the webs of the crankshaft. The webs of the crankshaft are also full material, plugged; this helps with compression and helps torque!
Percentage Of Balance For Pistons
Piston Piston Weight *Approx Includes all Aux parts Percentage of Balance
Mugello / Imola 186 250g 50.65%
Mugello / Imola 200 292g 44.50%
Mugello / Monza & TS1 336g 38.5%
Mugello / Monza 240 /250 336g 38.50%
As a comparison, the best other crank we tested on a Monza / Mugello / TS1 type piston came in at 18.5%!
We recommend that the weight of the piston be within the following limits. Minimum weight 240g, maximum weight 340g.
If you have a piston that weighs more or less then this, we would need you to weight all components, piston, rings, gudgeon pin, small end bearing and circlips, we will then have a crank manufactured for your specific requirements, although there would be a one to two month wait.
