[SEL] Hercules pistons and bores.

[Glenn A Karch]

Curt,

As far as I can tell, the bore on the small blocks was at 3.25.  I have had
several rebored and sleeved to 3.25 and any piston I used worked out OK.
There is no technical Hercules info available as far I know in regard to the
piston info you asked about, and there is no one left to ask.

Glenn

Glenn Karch
Haubstadt, IN, USA
Hercules Historian
----- Original Message -----
From: "Curt" <curt at imc-group.com>
To: "SEL" <sel at lists.stationary-engine.com>
Sent: Tuesday, January 11, 2005 8:09 AM
Subject: [SEL] Hercules pistons and bores.


> Have some questions about the smallest Herc pistons and bores.
>
> On the 1 1/2 - 2 HP Herc was the bore exactly 3.250 when new?
>
> Measuring an old piston (some wear?) the following measurements are found:
> Dia. Skirt is 3.243 (.007 clearance to bore)
> Dia. Land 3 is 3.238 ( -.005, .012 clearance to bore)
> Dia. Land 2 is 3.236 ( -.007, .014 clearance)
> Dia. at Top is 3.232  ( -.011, .018 clearance)
>
> Do these clearances seem right for a bore of this size?
>
> This engine has been bored to 3.264 (or .014 oversized). I have made a
> new piston for it and am wondering if I should simply take the old
> piston measurments and add .014 to each measurement, or if I should make
> some changes.
>
> A long time ago someone posted an old chart showing the correct step
> dimensions to compensate for higher temperatures at the crown of the
> piston. Is that information still around? Glenn, do you happen to have
> any old Hercules information on clearances and steps for these pistons?
>
> Looking forward to your thoughts and comments.
> Curt Holland
> Gastonia, NC
>
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