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Old 03-26-2009, 07:36 PM   #1
cribbie
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Member#: 184505
Join Date: Jul 2008
Chapter/Region: E. Canada
Location: Ontario
Vehicle:
2003 WRX
Sonic yellow

Default Wrist pin and rod question

Hey guys, my engine builder mentioned to me today that when my eagle rods are married to my ROSS pistons it has a lot of side to side movement compared to the stock piston and rod setup. When i say side to side i mean the top of the connecting rod that holds the wrist pin slides along from one end of the piston to the other ( if this makes any sense). Now my question is does this have to be within a certain spec? If i were to take a guess i would say that so long as the pistons movement is only up and down and the crank does not walk back and forth this should not have any effect because everything is all in line of each other.



This picture might shows more, if there is any confusion. It is the distance between "A" and "B" that is larger then the stock piston. All other clearances are bang on within the wrist pin and piston and wrist pin and rod etc etc.
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Last edited by cribbie; 03-27-2009 at 08:37 AM.
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Old 03-26-2009, 10:35 PM   #2
madmax718
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Default

Its angled for her pleasure.

If you look closely at some rods (yours included most likely) you'll see a little angle that allows it a little side to side play. There should not be any slop in the normal piston cycle movement (as I think you stated).

The side to side play actually allows for better lubrication at the actual surface that has the most contact. I still personally like the larger contact surface area.
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Old 03-27-2009, 08:37 AM   #3
cribbie
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Chapter/Region: E. Canada
Location: Ontario
Vehicle:
2003 WRX
Sonic yellow

Default

Added another picture for better illustration.
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Old 03-28-2009, 07:36 AM   #4
cribbie
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Member#: 184505
Join Date: Jul 2008
Chapter/Region: E. Canada
Location: Ontario
Vehicle:
2003 WRX
Sonic yellow

Default

bump for more input
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