Spoke with Sam Halkais [TR6 SCCA speed demon] on this issueas related to
TR6. One of his suggstions may relate to Spitfires.
He is more concerned with volume over pressure and therefore drills out the
oil galleys to 1/8th inch [I do not know what they are at stock].
I have an accusmp.I/J scraper and windage tray, and direct feeds to the oil
gally at three points.. The red idiot light never came on, but number six
rod bearing burned so bad the ARP bolts broke send ing the rod into the side
of the engine to no good. The rod is actually twisted and one round side is
now straight! These wre stock rods prepped as Kas showed in the original
comp book. They are shot peened and balanced. The ROD did not break, the
ARP bolts did.
This hapened at 6500 RPM following a long left hand sweeper. I have a stock
oil pan depth. Not sure of the if the depth of the pickup was correct. I
do plan on drilling the gallies, and extending the pan depth/pickup depth
and adding more oil so I do not suck air-- I am pretty sure this must have
been what happened.
On Thu, Oct 30, 2008 at 9:26 AM, Barr, Scott <sbarr@mccarty-law.com> wrote:
> We're planning to improve the baffling in our Spitfire oil pans for next
> year and are looking for any input you might have. (I say "pans",
> plural, because we hope to have more than one Spitfire next year.) Any
> thoughts on how baffling should be done?
>
> The oil pan we're using is currently baffled as described in the
> original Comp Prep Manuals. There's a divider down the center of the
> pan (longitudinally) which goes from the bottom of the pan (with a small
> space underneath - approx. 1/4") and extending up to the level of the
> shallow part of the pan. In the divider is a big swinging trap door
> allowing oil to surge from the right side of the pan over to the left
> (where the pickup is), but not the other way. There are some approx.
> 3/8th" holes (6 or 8) drilled in the trap door.
>
> For the last couple of years, we've had no luck keeping Spitfire motors
> alive for longer than one race. We've been losing rod and main
> bearings.
>
> Given that the pan is baffled and that I've got a 3-quart Accusump, I've
> never bothered to install a big red idiot light. Until the last race.
> (OK, call me a slow learner) What we found out watching the big red
> light (pressure switch set at 40psi) is that we're losing oil pressure
> very rapidly every time I turn left. Could be lots of things, including
> oil level set too low to start with, but we're going to install our new
> I-J crank scraper with directional screen windage tray, improve our pan
> baffling and see what happens next year.
>
> Scott B.
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--
Chuck Arnold
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