[Land-speed] dumb Question # 4856 - Wrist pins

[Dave Dahlgren]

I beg to differ as I have managed engine shops both production and race 
ones. setting the gage for pin bores takes under a minute especially with 
such a small difference in size same goes for the mandrel.

----- Original Message ----- 
From: "Kirkwood" <saltfever at comcast.net>
To: <land-speed at autox.team.net>
Sent: Thursday, November 24, 2011 2:04 AM
Subject: [Land-speed] dumb Question # 4856 - Wrist pins


> Agree with all of the above but the consumer is not the driver on the pin
> diameter substitution. It is (or was) the automotive machine shops. Prior 
> to
> the recent crate motor phenomena that has put many machine shops out of
> business, the major customers of aftermarket engine parts are automotive
> machine shops. They have a significant investment in tooling as wells a
> set-up time in the ubiquitous SBC. Having one pin diameter means you can 
> cut
> tooling inventory but the biggest savings is setup labor. Setting up the
> Sunnen rod hone and/or air gauge for one diameter and leaving it there all
> day for the majority of the work is profitable. Since engine balance is
> usually part of the machining job the pin weight delta is irrelevant.
> Economics is the driver and not performance.
>
> Larry Mayfield <drmayf at mayfco.com>
> I see a number of  Ford products whether pistons or  rods offered with the
> option of using the GM wrist pin diameter. . . . "why switch from 0.912 to
> 0.927 inch diameter wrist pins?