Here I go again!
Thread Starter
Drifting
Joined: Dec 2004
Posts: 1,321
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From: Edgewater (20 miles south of Daytona) Florida
Here I go again!
I got my new set of blower pistons from Keith Black today. That's the good news, the bad news is they are a couple of grams lighter than the old SRP's so the motor will have to be completly re balanced now.
Should have known it wouldn't be that easy and cheap . Glenn
Should have known it wouldn't be that easy and cheap . Glenn
Le Mans Master
Joined: Jun 2002
Posts: 8,339
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From: I can walk to MA
I always thought the "balance" was one piston assembly against the others ... match them exactly.
Am I missing something in this motor ?
What mass gets adjusted to compensate for a lighter piston ??
Am I missing something in this motor ?
What mass gets adjusted to compensate for a lighter piston ??
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Thread Starter
Drifting
Joined: Dec 2004
Posts: 1,321
Likes: 0
From: Edgewater (20 miles south of Daytona) Florida
A weighty subject
Originally Posted by SmokedTires
Glenn, what compression are you looking at with the flat top pistons? Can't wait to hear when you get it back together to enjoy again 
I can't wait to hear it once again and FEEL that kick in the but when I drop the hammer
Glenn
Le Mans Master
Joined: Sep 2001
Posts: 7,739
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From: Unreconstructed, South Carolina
4 g difference KB -vs- SRP??? Don't sweat that one little bit!!!!
And it's far less than a 1% diff too. What you compare against is the BOBWEIGHT ... that equals: ONE Whole rod & its bearings ... PLUS ... ONE Whole piston, pin, spirolox & ringpak ... PLUS ... ONE rod's Big End Only mass & its bearings ... PLUS about 4 grams of clinging oil ... that total is BW for a 90 degree motor (sbc & BBC are).
So ... if the the BW is about 1800g and you got 4g lighter pistons ... difference is on the order of 0.2-0.3% ... insignificant for all but true championship race motors.
I would verify the pistons are weight-matched within the set within 1-2g ... if they're quality pistons they will be.
*edit* if it's a BBC ... the BW probably at least 1900 ... and if only 2g piston diff ... BW diff about 0.1% ... not even peanuts.
And it's far less than a 1% diff too. What you compare against is the BOBWEIGHT ... that equals: ONE Whole rod & its bearings ... PLUS ... ONE Whole piston, pin, spirolox & ringpak ... PLUS ... ONE rod's Big End Only mass & its bearings ... PLUS about 4 grams of clinging oil ... that total is BW for a 90 degree motor (sbc & BBC are).
So ... if the the BW is about 1800g and you got 4g lighter pistons ... difference is on the order of 0.2-0.3% ... insignificant for all but true championship race motors.
I would verify the pistons are weight-matched within the set within 1-2g ... if they're quality pistons they will be.
*edit* if it's a BBC ... the BW probably at least 1900 ... and if only 2g piston diff ... BW diff about 0.1% ... not even peanuts.
Last edited by jackson; Aug 17, 2006 at 11:06 AM.