Adam,
The valve springs will need to be replaces with stronger (or double)
springs. If the pistons are dished they will have to be swapped for flat
topped, or domes, depending on what compression ratio you want. The cam
shaft will probably have to be replaced, or reground. I doubt that the
lobes are anything close to what you need for higher RPM use. I suspect
that the carbs will also have to be replaced or at least rejetted to be
better at the higher RPMs.
Good luck, and let us know how things go.
Peace,
Pat
- Support Habitat for Humanity, A "hand up", not a "hand out" -
Pat Horne, Network Manager, Shop Supervisor/Future planner, CS Dept,
University of Texas, 1 University Station C0500,Austin, Tx. 78712-1188 USA
voice (512)471-9730, fax (512)471-8885, horne@cs.utexas.edu
On Tue, 18 Mar 2003, Adam Bradley wrote:
> This is O/T because it's a J15 for my PL411 (J13 stock engine) instead of
> an H20 for my 1600 Roadster. I pulled a J15 out of a truck in a wrecking
> yard yesterday and took it right to the machine shop. I have a couple of
> questions about the engine; I want to make sure I get it built right and
> not rebuilt for low-RPM forklift use.
>
> I noticed the valves have one spring each, whereas my J13 has two
> springs. I think there were conversations about the two springs preventing
> valve float at higher RPMs. Is this correct? The specs for the forklift
> engine also specify a much tighter valve clearance (.010 vs. .014). Is
> that to compensate for the lower spring rate.
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