Scat crankshaft ?

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Scat crankshaft ?

Post  gmsmkr on June 30th 2015, 8:37 pm

What is the weight difference in the SCAT superlight forged crank vs a SCAT standard forged crank
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Re: Scat crankshaft ?

Post  gmsmkr on July 1st 2015, 4:42 pm

No body knows..... it's a 400$ price difference
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Re: Scat crankshaft ?

Post  dfree383 on July 1st 2015, 5:33 pm

Weight reduction does come to mind. But that just my keen sence for the obvious coming out. king
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Re: Scat crankshaft ?

Post  rmcomprandy on July 1st 2015, 6:38 pm

gmsmkr wrote:No body knows..... it's a 400$ price difference  

I would make a bet that SCAT knows ... give them a call.

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Re: Scat crankshaft ?

Post  supervel45 on July 1st 2015, 7:17 pm

http://www.survivalmotorsports.com/scatcrank06.pdf About 6lbs less on a 4.5" stroke BBC. Can't find any BBF weights on the net for some reason.

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Re: Scat crankshaft ?

Post  gmsmkr on July 1st 2015, 7:23 pm

 [/quote] I would make a bet that SCAT knows ... give them a call.[/quote]

Scat won't say I have called them... this why I posted it here


supervel45 wrote:http://www.survivalmotorsports.com/scatcrank06.pdf      About 6lbs less on a 4.5" stroke BBC. Can't find any BBF weights on the net for some reason.

Yep I just find it odd my self and scat won't even talk about the lightweight stuff for the bbf
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Re: Scat crankshaft ?

Post  supervel45 on July 1st 2015, 8:41 pm

gmsmkr wrote:No body knows..... it's a 400$ price difference  
Summit has them for about $240 more, with free shipping. I would not pay that much more either for a few pounds less.

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scat lightweight

Post  BIGINCH'S on July 11th 2015, 4:17 pm

A couple years back I inquired about the lighter crank and was told it was a weaker piece in a max effort deal

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Re: Scat crankshaft ?

Post  DaveMcLain on July 11th 2015, 5:52 pm

I would say that if you're building a large displacement engine that really crankshaft mass isn't a huge factor. The displacement is high relative to the mass and inertia of the crankshaft weather you deliberately try to lighten it or not. The money is probably best spent elsewhere where it can do more good when it comes to performance.

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Scat Vs Lunati

Post  69BOSS on July 22nd 2015, 7:03 pm

Scat and Lunati Std weight 4.5 stroker, are they the same import forgings, they both look ok but the lunati is about $300 cheaper. From what I have read balancing could be an issue. If I have to spend a lot to balance due to adding heavy metal would I be better off to spend extra and get a Callies Magnum USA made crank, $1800 but maybe no issues with balancing???? Any thought's or first hand experience would be appreciated. Also looking at Callies Compstar rods which look to be real nice for $600.
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Re: Scat crankshaft ?

Post  kim on July 22nd 2015, 8:23 pm

We had to take over 3lbs out of my SCAT billet crank.... sometimes it isn't the heavy Mallory in.

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Re: Scat crankshaft ?

Post  hienergy557 on July 22nd 2015, 10:17 pm

69BOSS wrote:Scat and Lunati Std weight 4.5 stroker, are they the same import forgings, they both look ok but the lunati is about $300 cheaper. From what I have read balancing could be an issue. If I have to spend a lot to balance due to adding heavy metal would I be better off to spend extra and get a Callies Magnum USA made crank, $1800 but maybe no issues with balancing???? Any thought's or first hand experience would be appreciated. Also looking at Callies Compstar rods which look to be real nice for $600.

I've used both Scat and lunati. Not the same forging.
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Re: Scat crankshaft ?

Post  69BOSS on July 23rd 2015, 12:36 am

Since you have used both, do you like one better than the other and why? Also, do you what size the pilot hole is at the back of the crank? I am running a stick so the hole needs to be about 1.85 and .500 deep.
Thanks,
Staci
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Re: Scat crankshaft ?

Post  IDT-572 on July 23rd 2015, 9:14 am

DaveMcLain wrote:I would say that if you're building a large displacement engine that really crankshaft mass isn't a huge factor.  The displacement is high relative to the mass and inertia of the crankshaft weather you deliberately try to lighten it or not.  The money is probably best spent elsewhere where it can do more good when it comes to performance.

X2
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Re: Scat crankshaft ?

Post  IDT-572 on July 23rd 2015, 9:16 am

hienergy557 wrote:
69BOSS wrote:Scat and Lunati Std weight 4.5 stroker, are they the same import forgings, they both look ok but the lunati is about $300 cheaper. From what I have read balancing could be an issue. If I have to spend a lot to balance due to adding heavy metal would I be better off to spend extra and get a Callies Magnum USA made crank, $1800 but maybe no issues with balancing???? Any thought's or first hand experience would be appreciated. Also looking at Callies Compstar rods which look to be real nice for $600.

I've used both Scat and lunati. Not the same forging.

X2 The Lunati crank has a lot nicer, cleaner finish than the Scat. I balanced one to 2260 gram bob weight no problem. But that's a very light bob.
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Re: Scat crankshaft ?

Post  69BOSS on July 23rd 2015, 9:45 am

Thanks for the info.
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Re: Scat crankshaft ?

Post  supervel45 on July 23rd 2015, 6:25 pm

supervel45 wrote:http://www.survivalmotorsports.com/scatcrank06.pdf      About 6lbs less on a 4.5" stroke BBC. Can't find any BBF weights on the net for some reason.
Correction, I was comparing the Lightweight to the Ultra Lightweight. Sorry about that.

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Re: Scat crankshaft ?

Post  hienergy557 on July 23rd 2015, 6:55 pm

The Lunati looks a better piece. Nicer finish. Machining looked and measured better.
No problem balancing. I can't remember the bob weight but it's a 4.5" Diamond flat top and a Callies I beam steel rod.
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Re: Scat crankshaft ?

Post  gmsmkr on July 24th 2015, 9:02 am

I think I will be going with a lunati crank it looks to be much better.
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Re: Scat crankshaft ?

Post  69BOSS on July 24th 2015, 11:44 am

Thanks for the info. I ordered a Lunati crank. Also got a set of P-51's on the way.
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Re: Scat crankshaft ?

Post  IDT-572 on July 24th 2015, 11:46 am

Wink Cool
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Re: Scat crankshaft ?

Post  Lem Evans on July 24th 2015, 12:50 pm

I've sold several of the Lunati crankshafts. Nobody has had to add any wt. to them.

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Good quality machining on the Lunati

Post  460pulling on July 24th 2015, 12:56 pm

The Lunati in my engine was very nice and balanced without issue. Now if they would make a 4.750 stroke version I would be all over it.

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Re: Scat crankshaft ?

Post  Paul Kane on July 25th 2015, 2:07 pm

Very Happy
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Re: Scat crankshaft ?

Post  69BOSS on July 26th 2015, 10:27 am

Sounds like a nice crank for the money. I can hardly wait to get it. I have been looking at bearing's and am considering Clevite "V" series, they offer .001 or .002 extra clearance and no groove. I don't know what clearance the std H or V series bearings would have as compared to a stock replacement bearing. I know most stock replacement bearings will yield about .001 to .0015 clearance, I am shooting for .003 to .0032. Can anyone tell me should I start with a .001 extra clearance bearing or .002 when using the H or V series bearings???
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