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RPO Z15.

1996 only.

Silver with black, red or grey interior.

LT1/A4 or LT4/ZF6....
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sliding Bob weigth
Senior Guru
Zagreb, Croatia
326 Posts
Member since:
2005/11/25 0:00



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I was calculating bob weigth and this is what I came up with

piston - 495g - reciprocating weigth
pin - 130g - reciprocating weigth
spirolocks - 2g - reciprocating weigth
ring set - 28g - reciprocating weigth
rod small end - 191g - reciprocating weigth
rod big end - 431g - rotating weigth
bearing - 46g - rotating weigth

I was using this formula: rotating weigth + 50% of reciprocating weigth

So I came up with bob weigth of 910g but since there are two pistons
per journal total bob weigth = 1820g

Can somebody verify my numbers?

I found some strange software, Maverick racing crank balance assistant
and according to it, my bob weigth shoul be 1600g????

Here is link to Maverick page and if somebody is interested, scroll
all the way down and download the software.

http://www.maverickracing.co.uk/crankbalsoft.htm
Posted on: 2010/1/19 18:46
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'90 L98 auto with a lot of mods
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sliding Re: Bob weigth
Senior Guru
Zagreb, Croatia
326 Posts
Member since:
2005/11/25 0:00



Offline
It looks like my calculation was OK.
In software, piston weigth should be input
together with pin weigth.
Posted on: 2010/1/19 18:54
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'90 L98 auto with a lot of mods
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