Balancing, expect heavy metal or not?

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Balancing, expect heavy metal or not?

Post  paperman on April 8th 2016, 3:42 pm

New Lunati 4.5 forged crank, Scat rods, Icon pistons. Would one assume that it will need weight? What combinations seem to need weight added to the crankshaft? I would assume a heavy bob-weight would need more weight added to the counterweights but I have missed the obvious before. About what point does one normally see the need for weight to be added?

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Re: Balancing, expect heavy metal or not?

Post  dfree383 on April 8th 2016, 4:20 pm

That one may get away without Mallory
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Re: Balancing, expect heavy metal or not?

Post  Lem Evans on April 8th 2016, 5:35 pm

What is the wt. of the pistons/pins?

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Re: Balancing, expect heavy metal or not?

Post  paperman on April 8th 2016, 6:41 pm

Piston 568 pin 141. Rod 810.

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Re: Balancing, expect heavy metal or not?

Post  Lem Evans on April 8th 2016, 6:58 pm

It should work w/o heavy metal. Sounds like a light bob wt. to me. Cool

Please report back after u get the deal done.

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Re: Balancing, expect heavy metal or not?

Post  paperman on May 4th 2016, 11:15 am

This set-up balanced without weight. One hole in each front and rear weight. Rod was 568 and 236, piston with pin and rings=806.

Lunati 4.5 forged
Scat I beam 6.7
Icon 4.390 with a 39cc dish
King bearing's

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Re: Balancing, expect heavy metal or not?

Post  Carl on May 9th 2016, 10:28 pm

I've never had to add metal in any Lunati crank. Can't say the same for other brands.

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