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SPG advice needed
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young1956
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Joined: September 29, 2015
Posts: 21
Location: Illinois
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PostPosted: Mon Dec 04, 2017 3:19 pm    Post subject: SPG advice needed Reply with quote

Hey guys, I’m installing a 69 mm SPG roller crank in my 40 horse and I’m looking for some advice. Has anybody successfully drilled in utilized squirter‘s for the big end of the rod? Does the Main bearing groove trick actually get the job done? Dave Greiner at Pro-Formance can perform the mod, I’m just looking for the best option. Also, I would appreciate some compression ratio advice and somebody to verify the fact that I need to run as light a flywheel as possible. Many thanks!
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RolandD
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Joined: January 15, 2017
Posts: 247
Location: Menomonee Falls, Wis
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PostPosted: Mon Dec 04, 2017 4:35 pm    Post subject: Re: SPG advice needed Reply with quote

I can not attest to what works, but I have an unused Roller crank that has main bearings with notches cut.

Crazy Roland
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gears
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Joined: October 28, 2002
Posts: 4391
Location: Tamarack, Bend, Kailua
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PostPosted: Thu Dec 07, 2017 9:01 pm    Post subject: Re: SPG advice needed Reply with quote

Notched main bearings aren't a "trick" thought up by someone, but rather that's how SPG lubricated their rollers. This modification must be precisely as per SPG original. If you don't have the bearings, I'd suggest borrowing an old set to duplicate.
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