Mechanic Brisbane

[oldfart]

Are we talking Static or Dynamic balancing here ?

[JIM77]

Best advice is  "Balance the crank"

Franks Cranks , you wont be any faster , but you with be smoooooooth , get cranked by Frank

Thats the ticket, the top end, rad valve and pipe will give me a bit more HP.

Where would Frank reside?

[JIM77]

Are we talking Static or Dynamic balancing here ?

Dunno the technical term, I assume Dynamic? Its not truing though thats what Serco do I believe.

[firko]

  Where would Frank reside?

Frank Stanborough lives in Blacktown, NSW. He isn't cheap but he's the absolute best going by the large number of high profile clients he has. Cranks aren't his bread and butter, he's actually a grandfatherly semi retired 74 yr old ex Team Kawasaki ,Team Honda and Team Heron Suzuki race engineer who still balances cranks for most of the factory road race and motocross teams. His main love however is turning old British singles into fire breathing monsters, just wait until his own Matchless G80 and Alan Jones CCM, Monark GP and revamped Black Betty hit the tracks in 2013 to see what a genius he is. There's hardly a go fast Matchless or Manx Norton in the country that Frank hasn't pointed his spanners at. Anyone who witnessed how rocket fast Glen Evans G85 Matchless Metisse is will know. The old guy has forgotten more stuff than a room full of 'internet engineers' will ever know.

[HuskyPete]

Getting your crank balance factor correct is the best money you can spend, the motor spins easier, doesn't shake the s**t out of everything including the rider. I convinced Burty to balance his RM400 because he kept flogging the main bearing surfaces in the cases, since changing the balance factor suprise suprise no more problem and a much smoooother, easier running engine, he as also dropped of a tooth on the sprocket because it's spinning up quicker and he doesn't have to hold in one gear revving the s**t out of it, he can slip into a higher gear and drive out of corners. He is more than impressed and has since had all his motors done, he said he wished he had done it much earlier. I had Ribbo's 74 Husky 400 just done and Ribbo could not believe the difference it made , he is now having his 490 Maygo/Maynot done at present .

I have just had 3 390 cranks done and there was a great discrepancy in the weight Frank had to adjust in each crank to get to the right balance factor, as he said the factories could not afford to have some guy balancing every crank, he said all the works motors are done, he showed me some pictures he had taken of works Yamaha, Honda and Kawa cranks, they are amazing .

Each motor i now rebuild it has been cranked by Frank



Jonesy's American Eagle Cranked by Frank



Cranked by Frank

[oldfart]

Husky , does he do it with the S/E pin and bearing installed.

[Lozza]

.

Each motor i now rebuild it has been cranked by Frank

That is the correct way to rebalance by adding mass to the light side. It adds inertia to which is where it's at.
 Here it's taken to the enth degree by Rotax


Then to another level altogether by Aprilia Corse in their RSW/RSA engines.

[HuskyPete]

Oldfart
To balance the crank Frank needs every thing that is attached to the crank, ie piston, pin, le brearing, clips, spacers so he can weigh the reciprocating weight than work out the balance factor and whether to add or remove weight.

[PEZBerq]

Oldfart. It is a static balance. Dynamic balancing is when you spin the component to speed and take measurements of phase and vibration displacement and calculate where to add remove weight. Dynamic balancing is needed for shafts that run above their first critical speed (first mode of vibration) such as steam turbines and generators etc.

[oldfart]

Thanks, I have a understanding of them both, but wasn't sure what method he was using.

[HuskyPete]

Shoeys just been cranked by Frank

[HVA61]

Another satisfied customer