My GT6 has the full external oiling system- fed off the main (vertical) galley,
to the remote filter, then the cooler, then a manifold from which four lines
run - one to each main.
I have never gone the extra step of drilling the crank. I have a 30 psi
pressure switch on the number one bearing oil feed line wired to a big red
light on my dash, which has never come on. Hot oil pressure is 70+ at full rpm,
40+ at idle.
I use a stock TR6 pump with the wire basket on suction end. Main bearings .002+
clearance, rods .0018-. Mains rarely show much wear, rods need replacement
after 2- 3 seasons of 5-6 weekends. Maybe the rods would last longer if the
crank was drilled.
The engine is typically at 4500-7200 rpm throughout a track session. I hit
7000 on virtually every shift.
No bearing failures yet! This has worked through several different engines and
numerous rebuilds over 12 years.
Sent from my iPhone
> On Sep 3, 2018, at 5:25 PM, Jason Sukey via Fot <fot at autox.team.net> wrote:
>
> I'm finally looking into my GT6 engine after parking it Friday of Kastner Cup
> weekend.
>
> Back story:
> Car ran great and allowed me to complete the competition school Thursday (4
> full sessions), but during my first practice session Friday, I pulled in
> early with low oil pressure and an audible rod knock.
> The #1 rod bearing was the source of the problem (extruded out the side gap).
> That's the only bearing that shows failure.
>
> Best I can tell it's a classic case of not enough oil to the front of the
> engine on the 6 cyl block.
> I was not running any auxiliary oil feeds- I plan on adding that, along with
> modifying the oil galleries in the block "per The book".
>
> My question is this: For the GT6 crank on a very mild engine (shifting at
> 6200 or below), is there any need for the additional oil drilling in the
> crank throws as suggested for the 1500 engines? What are you other GT6 guys
> using?
>
> At this point, if the crank passes mag check, I'm planning to have it
> ground/balanced/nitrided and using it for the rebuild.
>
> Thanks for the advice,
> Jason
>
>
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