Maybe I'm coming in the middle here, but I had a horrible time with #3 rod
bearings in my 1147, even after putting in an accusump. I tried feeds to the
galleries, accusump, cross drilling the crank, prepped rods, baffled oil
pan, swinging oil pickup, and lord knows what else. Best I ever got was an
engine that lasted 2 races.
On Thu, Oct 30, 2008 at 1:59 PM, Chuck Arnold <triosan@gmail.com> wrote:
> 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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