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Old 06-18-2003, 01:09 AM   #16
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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...
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Old 06-18-2003, 03:08 AM   #17
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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.
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Old 06-18-2003, 05:07 AM   #18
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Quote:
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.
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.

Scoops on the counterweight like the ones that appear on the Novarossi cranks are legal. Ever that not protrude on the channel.
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Old 06-18-2003, 05:12 AM   #19
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Yes... hence the "unbroken" 7mm diameter on the end...
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Old 06-18-2003, 05:34 AM   #20
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Quote:
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.
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Old 06-18-2003, 05:41 AM   #21
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Quote:
Originally posted by InitialD
Like this?
Yep, completely Illegal.
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Old 06-18-2003, 05:44 AM   #22
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Yep... Legal under all rule sets but EFRA
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Old 06-18-2003, 11:53 PM   #23
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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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