Porschetech3

I look to see what it will tell me.....

I've seen so much when looking in M96 sumps. From a little soot to heavy sludge, from a little plastic bits of different colors to melted plastic parts from over-heating, from no metalic particles to huge amounts of metal parts, from little pieces of silicone to large gobs of silicone , some springs, clips and other odd or foreign objects.., water, gas, and antifreeze, of course what I like to see is NOTHING but clean fresh oil ..

silver_tt

Great work. Articulating head bore scope is the only way to go....

TT Oversteer

Thanks for sharing the video. Is this method only possible for the 4-6 bank? I’ve scoped my engine both from the plug holes and the sump. Sump was difficult access and plug holes don’t tell the full story. Would you describe your subject engine as “bore scored”?

Porschetech3

I don't worry about Bank 1 cyl 1-2-3 .....yes it only works for Bank 2 cyl 4-5-6...every time I have seen any scoring on bank 1 it also had scoring on bank 2 so....

Bank 1 has three things going for it...1 . the water pump and inlet from the radiator is on that side so bank 1 get coolant first.....2 the Thrust side of the cylinder is the bottom side on the exhaust side and has gravity fore to help lubricate it....3... the piston pin is offset .5mm to the intake side which lowers thrust forces on the cylinder...

Bank 2 has 4 strikes against it...1. the water pump and inlet from the radiator is on the other bank so the coolant has to pass through the Sump to get to bank 2 which heated it up.. 2 the oil heat exchanger is mounted on the bank 2 side and transfers the hot oil heat to the coolant on that side.. 3 ..the thrust side of the cylinder is the upper/top/intake side and gravity force works against keeping lubrication on it.. 4 .. the piston offset is .5mm to the intake side which increses the thrust load because the thrust load on Bank 2 is on the intake side...( Porsche did not make the pistons bank specific) ...

So in light of all that I don't worry about bank 1 unless something specificaly directs me there.

No that engine would not be considered as bore scored....those small scratches are probably from a failing IMSB that was caught very early but the debris did some damage,or just some silicone particles that have came loose from the Lokasil and made a light scratch as it washed out and into the oil and drained .....

GC996

Good info Skip. Thanks.

Porschetech3

thanks Glenn I like to share some tibits of info every once in a while, not near as much as I used to though...

GC996

I know You are busy as heck, but man, we need you on the 996 forum!

JTT

It is truly a joy to learn about cars on a car forum. I for one am grateful for your contributions Doc

Porschetech3

thanks guys, I feel like I am so busey but it is just old age because I don't get anywhere near as much done in the same amount of time as I used to which is frustrating ...But the feedback and satisfaction is the only reason I keep doing it....

Charles Navarro

I will second that we never see bore scoring on bank one without bank two already being horribly scored. That's not to say you might find some sort of other damage or wear caused by something being ingested, but scoring on bank one without bank two is not likely.

Porschetech3

Right.....I have been thinking that with bank 2 having higher heat, and higher side loading thrust, and bore scoring being a not immediate failure but a long term failure, that using a higher film strength quality synthertic oil ( 5w-50+) would be my recommendation..II see no reason for using a 40 W except for gas mileage..I already have data that a 50W oil will help tremendously in oil pressure stabilization on the Track...( keeps more oil in the sump when the temps get high)