Illegal crankshafts
06-18-2003, 12:09 AM
#16
Tech Adept
EFRA rules say that the crank opening must end with continuous unbroken chamfer, i.e. the scoop can not extend into the bore.
Full set of EFRA 2003 200mm rules can be found in the AGM notes (pages 12-14).
IFMAR I'm not sure about. I'd be surprised if they had agreed a rule set...
Full set of EFRA 2003 200mm rules can be found in the AGM notes (pages 12-14).
IFMAR I'm not sure about. I'd be surprised if they had agreed a rule set...
06-18-2003, 04:07 AM
#18
Originally posted by sparksy
The EFRA rules are the only ones that mention the unbroken 7mm end hole. IFMAR rule set does not detail a ruling on the crank hole. Only carb, number of ports, size, and exhaust port height.
The EFRA rules are the only ones that mention the unbroken 7mm end hole. IFMAR rule set does not detail a ruling on the crank hole. Only carb, number of ports, size, and exhaust port height.
Those words are the quid of the question. The old crankshafts from JP with a large scoop protruding into the crank channel and similar are illegal under EFRA rules.
Scoops on the counterweight like the ones that appear on the Novarossi cranks are legal. Ever that not protrude on the channel.
06-18-2003, 04:34 AM
#20
Originally posted by Corse-R
Unbroken 7mm end diameter hole
Those words are the quid of the question. The old crankshafts from JP with a large scoop protruding into the crank channel and similar are illegal under EFRA rules.
Unbroken 7mm end diameter hole
Those words are the quid of the question. The old crankshafts from JP with a large scoop protruding into the crank channel and similar are illegal under EFRA rules.
06-18-2003, 04:41 AM
#21
Originally posted by InitialD
Like this?
Like this?
06-18-2003, 10:53 PM
#23
Stefan, my NovaMega SX12 blew up last weekend. The part under the piston where the wrist pin goes thru the piston had one side break.
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