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Author Topic:   Anyone run a 5140 crankshaft?
BrianW
Member
posted October 23, 2004 05:04 PM
Wondering if anyone runs one of the 5140 crankshafts? Has it held up well? Was thinking of getting one for a 406 I'll be building and was wondering if it's a good upgrade over a SCAT 9000 series cast crank.

Anyone know where the website that had them cheap is?

chomme
Member
posted October 23, 2004 07:15 PM
The metalurgy information tends to lend itself toward their opinion actually. I have a hard time believing any "testing" from vendors for obvious reasons. It says up to 8000 RPM and 800 hp... ? so will it spin 7900 all day long..? I wouldn't trust 5140 to do that for very long at all. For that matter I wouldn't trust many to do that actually. broken cranks are not good especially if you have any kind of money in anything else in the engine. I would get a used quality crank or even an undersized regrind before a 5140.
If you have it checked, magnafluxed, and even x-rayed the facts are in black and white no questions asked. physics are physics, either its sound or its not. 4340 is just better than 5140, thats a fact. yes it may be more money, but you do tend to get what ya pay for generally in cranks. If you are turning 6500 in a 3000 lb car and have no rubber to speak of under ya, 5140 is the way to go... 1300 lb sprint cars w/ 650 + at 8000 to 8200 and 35" of rubber down thats another story..
44H


BrianW
Member
posted October 25, 2004 07:32 PM
goinrcn44h - I was wondering if these were worth a little extra over a replacement SCAT crank - the ones that you can pick up for $199-249 everywhere or if they weren't worth the extra $50-100 over the scat... If I could find a good used 4340 crank I would buy it in a second, but most have been run hard and are scored up or cut way under from what I've found...


stockcar5
Member
posted October 25, 2004 07:54 PM
the biggest ? is what is the crank going in? is it a high hp monster in a late model or is this for a 2bbl hobby stock class? thats what really gonna tell you if you need a steel crank or not. not much sense in buying a 300$ crank anyway when you gotta replace it everytime you freshen your motor...unless you live in claim country

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[This message has been edited by stockcar5 (edited October 25, 2004).]

BrianW
Member
posted October 25, 2004 08:00 PM
It's going in an IMCA type modified. 4bbl C&S aresol carb on alcohol, flat tappet cam, estimate ~600 hp at 6500 according to sim software...


goinrcn44h
Member
posted October 27, 2004 12:47 PM
In that sort of a deal I would think you'd want just about the best you can afford. You are gettin into the range when you really start seeing flaws and weak links quick. That number may be a touch high but if everything is done right its definately not impossible. I have seen several places on ebay that sell new 4340 cranks for 399 if you look alot. Also, call engine builders and just ask if they have what you are lookin for and leave your number if they get a line on one. Most will not worry about makin much to show good faith so that maybe next time you use them for any work needing done.. Check with Tim at Schwankeshortblocks.com he has a used section that is updated pretty regular and has some swingin prices on stuff..FYI
44H


stockcar5
Member
posted October 27, 2004 03:52 PM
at 600hp i'd serously consider a dragonslayer or even a good used callies, crower ect.. your gonna save money in the long run.

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