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Author
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Topic: Relative crankshaft strengths?
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futurattraction
Gearhead Posts: 108
From: Iowa City, IA
Registered: Oct 2001
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posted 12-28-2001 12:09 AM
   
When looking at stroker cranks, how does the Scat cast steel crank stack up against the Eagle 4340 crank? What kind of power levels are either of them capable of handling? Just for comparison's sake, how much better are either of them than using a factory 400 Ford crank that has been turned down to 351C main and SBC rod journals? I'm hoping to put together a 450-475HP Cleveland stroker, but would like to build into the equation the possibility of adding a max of 200 N2O in the future. Thanks for whatever light anyone can shed on this question! 
SP
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Rory McNeil
Gearhead Posts: 1572
From: Surrey, B.C. Canada
Registered: Nov 2000
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posted 12-28-2001 02:48 AM
I don`t know about the aftermarket cranks, but several local racers have had broken 400 cranks in their 351W strokers, when they got into the 418-426 ci range. If you are planning on an engine of that size, the aftermarket crank sounds like a good investment.------------------
78 Fairmont 428 4 speed 10.20@130mph
80 Fairmont 302 5 speed 12.8@105mph
85 Mustang NHRA Stocker under construction, 302 5 speed
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Rustang
Gearhead Posts: 775
From: Clarion PA
Registered: Nov 2000
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posted 12-28-2001 04:56 AM
I'm now in the process of going thru a steep learning curve on 351W cranks, having recently broken one this summer that was turned down to cleveland mains, full chevy rod journal. So here's my .02. If you're in the 550hp and up level(and you would be with N2O)you're running on borrowed time with a production crank. Internal balancing will help, but combine that with the other necessary crank mods and you're at the price of the Scat or Eagle. The eagle crank, because it is a 4140 (4130?)forging, should be stronger than the Scat, but I wouldn't fear either of them strength-wise for your application. One comment about the Eagle, they have a reputation for poor tolerances: Bad tapers and eggshapes on the journals. You don't here this about the Scat stuff. There is another company called Cat that is offering cranks too, but I haven't heard good/bad about them.
Here's a link to Cat: http://www.catpep.com/Products.htm------------------
'68 mustang 351 clevor- 10.92@124
'67 Stang, 351W -11.18@118
'69 351C Torino-14.90@100
'78 Pickup 351W-15.56@88
'79 Pickup 460 ET=??
http://www.rustang-racing.cityslide.com/contents/contents.cfm/712231
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Moneymaker
Administrator Posts: 26513
From: Lyons, IL, USA
Registered: May 99
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posted 12-31-2001 12:02 PM
I like the Scat stuff personally. The Eagle products have good quality, but have a tendancy to be heavy.  ------------------
Alex Denysenko
Co-Administrator and Moderator
NHRA/IHRA/SRA member
NHRA and IHRA SS/LA National Record Holder '00 & '01
Fleet of FoMoCo products
Moneymaker Bio
US Class Nationals link
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futurattraction
Gearhead Posts: 108
From: Iowa City, IA
Registered: Oct 2001
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posted 12-31-2001 03:18 PM
Alex,
Do you happen to sell Scat products??? If so, I'd be interested to see what kind of price you could offer on probably a 3.85 stroke Cleveland crank, with SBC rod journals. You can reply on the board, or if you prefer to e-mail me, that's okay, too. Thanks.
Scott
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Moneymaker
Administrator Posts: 26513
From: Lyons, IL, USA
Registered: May 99
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posted 12-31-2001 03:47 PM
Scott, that is not a standard size that Scat offers. They do offer a 4.000 with a 2.100 rod bearing. Their 3.85 uses a 2.311 rod bearing size. ------------------
Alex Denysenko
Co-Administrator and Moderator
NHRA/IHRA/SRA member
NHRA and IHRA SS/LA National Record Holder '00 & '01
Fleet of FoMoCo products
Moneymaker Bio
US Class Nationals link
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futurattraction
Gearhead Posts: 108
From: Iowa City, IA
Registered: Oct 2001
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posted 12-31-2001 05:01 PM
Alex,
I'm not sure how to say this without sounding like I'm ignoring your reply...I saw on the Flatlander site that the 3.85 stroke is available with the SBC size journal, and Phil (Flatlander contact) confirmed that they're available in that configuration...so unless he's got some special connection with Scat, (or gave me misinformation) I'm hoping that they can be gotten. http://www.flatlanderracing.com/scatcranksford.html If you scroll down to the cast steel 9000 series for 351 Fords, there is a note at the bottom saying the 3.85 crank is available with SBC r.j. Granted, the info in parentheses is kinda confusing...so I e-mailed Phil. Anyway, that's what I'm going by. I guess I'm gonna have to either rethink rod journals or jump up to the 4.00 stroker if I've been misled...  I hope my response doesn't put me in a bad light in your eyes...  Thanks for your replies...
Scott
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Moneymaker
Administrator Posts: 26513
From: Lyons, IL, USA
Registered: May 99
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posted 12-31-2001 05:37 PM
Sorry Scott, but I do not live on line. I do not use websites for catalog info. Flatlander must have newer information than I do and I must have an older cataloge. If you can give me a part number I can give you a price. ------------------
Alex Denysenko
Co-Administrator and Moderator
NHRA/IHRA/SRA member
NHRA and IHRA SS/LA National Record Holder '00 & '01
Fleet of FoMoCo products
Moneymaker Bio
US Class Nationals link
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futurattraction
Gearhead Posts: 108
From: Iowa City, IA
Registered: Oct 2001
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posted 12-31-2001 05:49 PM
Fair enough Alex. I'll see if I can round up a part number... While I'm being a pain, do you have access to custom order pistons? If so, what company(ies) do you deal with? Thanks for your patience!!!
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Moneymaker
Administrator Posts: 26513
From: Lyons, IL, USA
Registered: May 99
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posted 12-31-2001 05:53 PM
CP (the best), Venolia, and Ross. ------------------
Alex Denysenko
Co-Administrator and Moderator
NHRA/IHRA/SRA member
NHRA and IHRA SS/LA National Record Holder '00 & '01
Fleet of FoMoCo products
Moneymaker Bio
US Class Nationals link
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futurattraction
Gearhead Posts: 108
From: Iowa City, IA
Registered: Oct 2001
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posted 12-31-2001 06:40 PM
Alex,
Here is the part number Phil just sent me. Since I don't have access to a catalog either, all I can do is hope that it works for you.9-351-385-6000-2100C Regarding pistons, since I'm not familiar with CP, what makes them better than the others? Just curious. Venolia and Ross, of course, I've been familiar with for decades, plus many others. If there's a choice, what alloy would you recommend for a street/strip engine, leaning heavily on the street side? Lower expansion rate would seem to make sense for street. Depending on my final crankshaft stroke choice, they'd have to be custom comp height with reverse dome (mirror of chamber), floating pin (.927), probably 1/16-1/16-3/16. What kind of bore clearance? Other thoughts are more than welcome. Any general price range you can shoot me (publicly or privately) for the above features, along with pins and pin fitting? Thanks for your time and effort. Scott
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