[DeTomaso] This ought to be fun...
Thomas Tornblom
thomas at hax.se
Tue Apr 17 15:34:33 EDT 2012
2012-04-17 20:32, Kirby Schrader skrev:
> Thanks, guys. Appreciate the feedback.
> Actually, what improved my motivation last weekend was taking the GT40
> out and driving it over to Will's to pick up some main caps. Then I
> stopped by Gullo Ford in Conroe for their annual Ford get together.
> I got a lot of oohs and aahhhs when I drove up. They had some nice cars
> there.
>
> To answer your question, Thomas....
> I am using an MSD distributor, but it's only there to turn the oil pump.
> It's not wired up.
> An Electromotive TECgt ECU is being used and I'm triggering off the crank.
I was just thinking about the possibility of a broken gear pin. The risk
of losing oil pressure with a crank trigger ignition.
But with Dan chiming in, I'll stay quiet :)
>
> The distributor is using a brass gear and it shows a little wear, but
> nothing dramatic.
> Heavy duty Motorsports oil pump shaft and it is fine.
>
> Kirby
Cheers,
Thomas
>
> On Tue, Apr 17, 2012 at 11:45, Thomas Tornblom <thomas at hax.se
> <mailto:thomas at hax.se>> wrote:
>
> Are you running distributorless? Perhaps the oil pump drive if so?
>
> Cheers,
> Thomas
>
>
> 2012-04-17 17:40, Kirby Schrader skrev:
> > Personally recovering from major depression and lack of
> motivation on the
> > Pantera front in Magnolia...
> >
> > The Space City guys already know about this and we've discussed
> it a lot,
> > but for some reason, I'm in the mood to throw it out to the rest
> of the
> > collective.
> >
> > My new 377 Cleveland engine build with less than 400 miles on it
> spun the
> > front main bearing.
> > I have never seen this happen, ever... and I've run the same
> combination of
> > block, crankshaft, rods, etc. for years and beat the crap out of
> it with no
> > problems.
> > Daily driver, track events, etc.
> >
> > Facts for your consideration follow. I can get more detailed, but
> I think
> > the following is enough to start you thinking.
> >
> > 1) Two bolt main iron block, lifter bores bushed, line bored, J&E
> pistons,
> > Eagle rods, nodular iron crankshaft from Quella, Moroso
> restrictors (I
> > spent a lot of money on this block!)
> > 2) Iron 4V heads, new valves, springs, etc. etc. etc.
> > 3) Comp Cams solid roller cam, lifters, pushrods, rockers
> > 4) Symptoms were that my oil pressure started dropping gradually
> when I was
> > driving home from the annual SCP pig roast. By the time I got to
> the last
> > stoplight before my house, I was down to 10 psi hot at idle. Oil
> pressure
> > is taken from the port just above the filter. You know it was
> less at the
> > back of the engine.
> > 5) There were no knocking, banging or otherwise nasty noises.
> Main bearing
> > problems make distinctive noises. I know. Been there, done that.
> Got the
> > scars. But I did not hear anything this time.
> > 6) I pulled the pan and found bearing material.
> > 7) Pulled the oil pump and it had obviously done some trash pumping.
> > 8) All the other rod bearings and main bearings look just fine.
> > 9) The front one had not only spun (when I pulled the cap, both
> had rotated
> > by about 40 degrees), but one half was actually partially canted
> out of the
> > web towards the front of the engine. I have pictures if you're
> desperate.
> > 10) Nothing is blue or shows signs of getting hot.
> > 11) The main cap is worn badly and has to be replaced.
> > 12) The machinist thinks he can salvage the block with another
> line bore. I
> > hope so...
> > 13) The crankshaft journal needs turning, obviously, and can be
> saved.
> > 14) The machine shop put the short block together, I assembled
> the rest
> > 15) I had an Accusump plumbed into the back of the block where
> the stock
> > oil sender usually resides. Accusump was set at 30psi.
> >
> > Proposed failure modes
> > a) The main bearing was put in upside down - The machine shop is
> adamant
> > that is not the case. 'Hell, no! No way!' was the response to
> that one...
> > b) The crankshaft is bent - He's checking this week, but that
> would have
> > been very apparent during assembly, so he believes strongly this
> is not the
> > case.
> > c) Not enough oil pressure - On start up and later, 65psi hot at
> rpm, 30psi
> > hot at idle.
> > d) It ran fine while I was tuning the EFI. Other than running rich
> > initially and some issues with the ECU, I had no problems.
> >
> > Fortunately, no other damage occurred.
> >
> > So..... my questions....
> >
> > Why did it fail?
> > What do I do to make sure it doesn't happen again?
> > Why me?
> >
> > Who am I and why am I here?
> > :-)
> >
> > Let the fun begin.
> > Regards,
> > Kirby
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> --
> Real life: Thomas Törnblom Email: thomas at hax.se
> <mailto:thomas at hax.se>
> Snail mail: Banvallsvägen 14 Phone: +46 18 32 31 18
> S - 754 40 Uppsala, Sweden Mobile: +46 76 209 8320
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--
Real life: Thomas Törnblom Email: thomas at hax.se
Snail mail: Banvallsvägen 14 Phone: +46 18 32 31 18
S - 754 40 Uppsala, Sweden Mobile: +46 76 209 8320
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