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Jeff Kinsler · 02:19 PM

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.

Jack Ferris · 12-15-2018, 01:48 PM

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.

Jeff Kinsler · 12-15-2018, 01:51 PM

Quote:

Originally Posted by Jack Ferris

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

lust4speed · 12-19-2018, 03:05 AM

Quote:

Originally Posted by Jack Ferris

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.

My SG 4.500 crank is going on 3 years of racing with no problems. Mild 700 HP build shifting at 6,800 RPM. Had it checked and mag'd by the machine shop when first purchased and it was good to go.

Jack Ferris · 12-19-2018, 12:40 PM

Quote:

Originally Posted by lust4speed

My SG 4.500 crank is going on 3 years of racing with no problems. Mild 700 HP build shifting at 6,800 RPM. Had it checked and mag'd by the machine shop when first purchased and it was good to go.

Thank you. My goal for this build is 860-880 HP. There are many opposing views on this particular brand of crankshaft, even on the "other brand" sites but most, if not all speak of the final machining process being the deal breaker and speak little about strength. I have to assume that no matter which company finishes them if they are overseas forgings they are very similar in overall strength. I'm sure some have been broken and I have spoken to a few in the bowtie camp that have broken an overseas forging, but that's where the story ends. No hows or why they failed. Mr. Kinsler's information is priceless as we all know the level of power he makes.

PAUL K · 12-19-2018, 04:48 PM

Quote:

Originally Posted by Jack Ferris

Thank you. My goal for this build is 860-880 HP. There are many opposing views on this particular brand of crankshaft, even on the "other brand" sites but most, if not all speak of the final machining process being the deal breaker and speak little about strength. I have to assume that no matter which company finishes them if they are overseas forgings they are very similar in overall strength. I'm sure some have been broken and I have spoken to a few in the bowtie camp that have broken an overseas forging, but that's where the story ends. No hows or why they failed. Mr. Kinsler's information is priceless as we all know the level of power he makes.

I agree with all the above. Sometime research the 500557 block lol. We've used a handful of SGI cranks and never had issues with there cranks. A couple had oversized main journals but we skimmed them down to STD spec. For a while they were the only option for the 3.25 main 4.5 stroke crank.... they might still be??

gtofreek · 01-09-2019, 10:05 PM

Quote:

Originally Posted by Jack Ferris

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.

We have used a lot of SGI cranks and never had a problem with one. Occasionally we will find the journals a tad on the large side and have to use X bearings or a combination of standard and X to get clearances right but they are good cranks. I feel they are every bit as good as SCAT.

Tom McQueen · 01-21-2019, 02:17 PM

This is a Bryant billet I had made for the twin turbo.
4.125" stroke.

J.C.you · 12-15-2018, 02:13 PM

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

mgarblik · 12-15-2018, 02:21 PM

Quote:

Originally Posted by Jeff Kinsler

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. Qualify 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.

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.

Jeff Kinsler · 12-15-2018, 11:34 PM

Quote:

Originally Posted by mgarblik

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.

No problem just trying to help out. Your info is very valuable as well. Billet cranks are pricey now adays.

PAUL K · 12-15-2018, 02:27 PM

Good info....thanks

GTO Dan · 12-15-2018, 03:22 PM

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

bad69bird · 12-15-2018, 04:04 PM

Quote:

Originally Posted by GTO Dan

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

LMAO^^^

johnta1 · 12-15-2018, 04:26 PM

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.

bad69bird · 12-15-2018, 04:30 PM

Quote:

Originally Posted by johnta1

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.

johnta1 · 12-15-2018, 05:19 PM

Quote:

Jeffy might and that's his pejorative.

I think that should be prerogative?

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

Jeff Kinsler · 12-15-2018, 11:32 PM

Quote:

Originally Posted by bad69bird

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.

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.