Main Bearing Cap Bolt Reuse

[MGBV8]

Honda was pretty serious about oil squirters to keep the S2000 pistons cool.  What does it do to the oil temp?

[MG four six eight]

I would think that it increases it slightly, after all the heat has to go somewhere ;-). Not sure if the S2000 uses an oil cooler, I know that a lot of GM engines do.

[BriansMGBV8]

Art,
ARP directed 110 lbs. The directions were specific to the 3.5 Rover. My courage only took me to 100lbs. Machinists did initial torque and recommended I retorque to the same as the studs require stretch to hold. They were solid to 100 lbs.

I appreciate the guidance on the squirt holes. I inspected and they're definitely there. Neither manual I have talks to these feature though both manuals tell you to put the dimple on the rod forward for right bank and aft for the left. This puts the squirt hole at the top. I notched the bearing to match the hole.

[BlownMGB-V8]

If you look at the oil holes in the crank, of course they follow the throws, unless cross drilled. The top main has the oil groove. So pressurized oil is only available on about the bottom 140 degrees or less of crank swing. That means the only oil available to the squirt hole is what remains in the "wedge" as the rod comes around the top, meaning also that the squirt hole is depleting the oil cushion available for the bearing on the power stroke.

Everything has a cost.

Jim

[MG four six eight]

This is actually one of the better (least scored) pistons and it's difficult to photograph the scoring and have it show in the pic. In the pic they look like scratches, but you can actually drag your finger nail across them and feel that they are fairly deep. Also disregard the corrosion as they have been laying outside in my scrap metal recycle pile!
All 8 pistons have it and the thrust side is worse than the non-thrust side. Upon tear down it definitely caught my attention as it is something that I do not usually see on a low mileage engine.

[roverman]

One problem is the 60 year-old design. Fortunately, piston/ring designers evolved.