4.500 inch Scat Forged crank results
 

I know there have been some posts on here about how good or not how good the Scat Forged Cranks are and I have some positive results from them.
Last night I pulled the shortblock apart and the rod and main bearings (which are the same ones from last season) still look great. I am sure that running aluminum rods definitely help. I run some pretty high rpm also 8100 on the shift and trap 8500 and this crank has seen 8700 to 8800 rpms many many times. The BES oiling mod to the block and crank is one of the reasons this engine lives the way it does. Quality machine work is another reason why alot of people have had problems and that includes me. I would recommend using one of these cranks for anyone that is making up to 1500 horsepower. Hope this helps people that have been on the fence about using a 700.00 to 800.00 crank in an engine making decent horsepower. I purchased mine from Butler Performance and highly recommend them.

Great information Jeff.
I have a new SG 4.500 crank that came from AP but I’ve not heard a lot of feedback on them so I’m hesitant to use it. I do have a 4.250 SCAT crank so your post has been a plus.

I ran a 4.250 Scat that was turned down to 4.150 when I was running the 499 cubic inch deal and that was fine also

Nice info Jeff....... But you're on the 4.25 stroke max hit list now.

Thank you for that report and results from real on-track experience. This adds validity to my impressions after carefully looking those crankshafts over at PRI last year. Visually, to me the oiling circuits in the crankshaft are world's apart from the Eagle stuff and other off-shore offerings. I just hate the huge "winking eye" depressions Eagle uses to move oil from block to mains and then the rods. The Scat oiling looks similar to the way quality billet cranks carry oil. I will likely be buying a 3.25x4.25" Scat forging for my street car based on what I have seen and your experiences. Good info.

Good info....thanks

This must be fake news. I read on here that the ECM does not share information. :bounce:

LMAO^^^

Any pics of the BES oiling mod to the block and crank?
How about pics of the crank oil holes on mains and rods?


Is the rear seal area smooth or cross-hatched?


Thanks.

John,

IMO, I don't think that would be fair to BES to put that out there. They are in business to make money. It would be different if he came up with it himself and he wasn't going to market it. Jeffy might and that's his pejorative.

I think that should be prerogative?

:confused:

That's fine on BES thing.
It's probably well known anyway to most builders.
Goes along with Quality machine work


:)

He's trying to impress AQ :pound:

AQ for Prez!

Here is a pic of what Eagle main oiling looks like. Essentially, a rough, giant trough, carved into the crankshaft journal. No scoop or lead into the direction of crank rotation. So large, the depression takes valuable support area away from the crankshaft. Many of the cheap Chinese shafts utilize this low cost approach of feeding oil to the bearings. If your making a few hundred HP with a V-8, probably works OK. NONE of the quality crankshaft manufacturers use this cut rate approach to oiling. Crower, Moldex, Winberg, Bryant, and now apparently Scat, choose to oil the mains properly with carefully designed scoops and directional oil flow. Not the best place to cut corners IMO.

Here are a couple of pics of what a correct main oil feed should look like.

Better pics of Eagle stuff.

Thanks for the info, Jeff. I've had very good results with my 4.00" Scat crank I bought from BOP. Saved a ton of money and time compared to waiting on a billet crank.


Jim

Glad to hear it. Butler is almost thru with my 535 short block and that’s the crank we used with Oliver rods

LOL.. :D

Yea I will not post it for the reason above but anyone can send their stuff there to get it machined. I think it actually was talked about on py somewhere and people were saying that's not a good way to do it.