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Greg,
To get a larger radius on the crankpins, do you weld the edges and then
regrind? On my current engine, I welded the edges of the crankpins to
reduce their width so they would accommodate chevy rods. I them reground
with a larger radius to reduce the stress riser. This is a cheap
approach that addresses both weaknesses, rods and cranks. Others on the
list have used chevy or other commodity rods, but have used spacers at
the wrist pin to center the rod. The only problem is that welding puts a
lot of stresses in the crank and proper nitriding requires stress
relieving. The grinder had a hard time getting it straight. He said it
was out 0.022 the first time it came out of the oven.
Larry Young
Greg Solow wrote:
> A good used crank properly race prepared, deep case nitrided and
> ground with the proper radii on the journals, is very reliable at
> power outputs of up to 165 hp as long as the revs are kept below 6800
> rpm. The weak link in bottom end is the connecting rod. For use over
> 6,000 rpm they need to be replaced with steel billet rods.
>
> Greg Solow
>
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Greg,<br>
To get a larger radius on the crankpins, do you weld the edges and then
regrind? On my current engine, I welded the edges of the crankpins to
reduce their width so they would accommodate chevy rods. I them
reground with a larger radius to reduce the stress riser. This is a
cheap approach that addresses both weaknesses, rods and cranks. Others
on the list have used chevy or other commodity rods, but have used
spacers at the wrist pin to center the rod. The only problem is that
welding puts a lot of stresses in the crank and proper nitriding
requires stress relieving. The grinder had a hard time getting it
straight. He said it was out 0.022 the first time it came out of the
oven.<br>
Larry Young<br>
<br>
Greg Solow wrote:
<blockquote cite="mid:002d01c91203$1cc600b0$6401a8c0@TER2"; type="cite">
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<div><font face="Arial" size="2">A good used crank properly race
prepared, deep case nitrided and ground with the proper radii on the
journals, is very reliable at power outputs of up to 165 hp as long as
the revs are kept below 6800 rpm. The weak link in bottom end is the
connecting rod. For use over 6,000 rpm they need to be replaced with
steel billet rods. </font></div>
<div><font face="Arial" size="2">
Greg Solow</font></div>
<br>
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