MTFCA Forum

I have customer engine I am working on with about 2500 miles on it since a Scat stroker with Scat new insert rods were installed with rebuild. No oil pump. Egge pistons, STD. Bore.
1. Piston pins have wear at the rod bushings, about 5 to 10 K. Pistons bushings fine.
2. Is it needed to grind the Scat rods to clear the cam?
3. Does anyone know of a rod dipper that will fit Scat rods?
You can email me or pm me if you want. Thanks, Dan

That's huge for the limited time on the engine. If its the writ pins, I would check the hardness on the pins- they may have not been heat treated correctly. 2nd question- what head was this running with. T size wrist pins will not take high compression ratios without excessive wear after a while. I've seen piton bosses pounded out and they have double the load area of a pin eye. How do the cylinder walls look- was there any evidence of lack of oil?
If T rod scoops won't fit the Scat rods, do it the way we used to make rod scoops before the vendors sold them- get some 216 Chevy rod scoops and redrill them to fit the rods and trim the ends- they are plenty long enough.

Can you post some pictures of the wear?

Your wrist pin issues sounds like it could be pin hardness. Have you checked the rods for proper alignment?

Just one minor thing I’d like to point out that I’m sure you already know, but I’d like to bring it up for the possible benefit of others viewing this thread.

Inserts are more correct for a pressurized oil system.

Babbitt is more correct for non-pressurized oil systems.

The reason is that the regular thick babbitt can “bed in”
contaminants and keep them from rapidly wearing the crankshaft. The inserts only have a very thin layer of babbitt which is an anti friction material, but not thick enough to bed in most contaminants. The pressurized system constantly forces filtered oil thru the bearings.

BABBITTED SCAT RODS:

Dan: Not sure which head, but it is AL. I think Z head. Pistons are Egge for the Scat rods, the snap rings to hold the pin.

Adam: Did you Babbitt those rods? All I have seen is the insert rods for the A type Scat crank.

Thanks for the reply’s guys. Dan

Almost forgot about the grinding off corner of rod to clear camshaft. Is this something that needs to be done? It makes these rods want strip out when they are removed. Input? Dan

Dan, I did babbitt & machine those rods. It was done a couple years ago for a friend of mine. They went in a stroker SCAT Fronty motor. If I remember correctly, I think they were ordered as rods for babbitt.

Also, I remember there was a very specific torque procedure and a specific lubricant that SCAT specified on their rods. Might be worth calling them to find out.

Btt

Thanks to Mike. Bender for some more info. Dan

And what did that fine gentleman Mr. Bender have to say. Care to share his wisdom ??? I now he's doing some SCAT work for our Mr. Thrifty (Jelf).

Too much to post here. This post would be way to long.