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Need a piston measurement

iceman69510

Turn Right Racing
Staff member
Joined
Mar 5, 2001
Messages
10,964
Location
Michigan
Hello, anyone with a stock GVR4 or 1g 6 bolt piston handy, I need to know the measurement of the space between pin bores (where the rod attaches)in the bottom of the piston.

Thanks.
 

matt92vr4

Well-known member
Joined
Oct 3, 2010
Messages
676
Location
Venice, FL
I sold all of my precision measuring tools so I apologize for this in advance. Depending on what you or doing it may or may not help. I just pulled my pistons last night. It is 1 3/16" between the two inner surfaces.
 

mitsuturbo

Well-known member
Joined
Jun 2, 2008
Messages
3,551
Location
Near Seattle, Washington
How accurate do you need it? I provided a pic in the pistons/rods thread currently being commented on. Maybe that will help as well.
I can measure it, i just forgot to last night.
 

iceman69510

Turn Right Racing
Staff member
Joined
Mar 5, 2001
Messages
10,964
Location
Michigan
Matt's measurement provided me ball park, at 30.2 mm. I think it is likely spec'd at 30 +/-.

I saw the drawing you provided (have seen that before as well). Interesting that those dimensions are not 100% accurate to the factory. That states the stock 1g rod small end is 1.140" (28.96 mm), but factory spec is 28.5 mm which is 1.122". I have not looked at all the others in detail yet.
 
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