Hemi crankshaft
#961361
03/29/11 12:01 AM
03/29/11 12:01 AM
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Joined: Jun 2009
Posts: 1,212
QLD Australia
Keith Black®
OP
pro stock
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OP
pro stock
Joined: Jun 2009
Posts: 1,212
QLD Australia
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Hoping you guys can help me out with my choice of crankshaft. I’m afer a 4.500 crank for the Hemi. Here is the final 4 in my shortlist: Crower #95168 – 4340 Chromoly Forged Crower #95168 – ENB30B Billet Steel Crower #LW95168 – ENB30B Billet Steel “Lightweight” profile Crower #UL95168 – ENB30B Billet Steel “Ultralight” profile Must be strong enough to handle 1,100-ftlbs/1,500hp although will only see this < 0.5% of the time. Like the idea of lightweight rotating assembly. My assumption is that lighter weight means easier on parts i.e. more durable. Light = better throttle response. Are my assumptions flawed? Has anyone used a Ultralight crank in a steel rod type street/odd strip application? Help & comments appreciated. I am married to the idea of getting the crower crank at this stage as they seem to have a good reputation for quality from what I can tell. 
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Darren Beale
Keith Black Racing Engines®
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Re: Hemi crankshaft
[Re: Keith Black®]
#961362
03/29/11 12:26 AM
03/29/11 12:26 AM
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Joined: Aug 2003
Posts: 43,232
Bend,OR USA
Cab_Burge
I Win
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I Win
Joined: Aug 2003
Posts: 43,232
Bend,OR USA
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Quote:
Hoping you guys can help me out with my choice of crankshaft. I’m afer a 4.500 crank for the Hemi. Here is the final 4 in my shortlist:Crower #95168 – 4340 Chromoly Forged Crower #95168 – ENB30B Billet SteelCrower #LW95168 – ENB30B Billet Steel “Lightweight” profile Crower #UL95168 – ENB30B Billet Steel “Ultralight” profileMust be strong enough to handle 1,100-ftlbs/1,500hp although will only see this < 0.5% of the time.Like the idea of lightweight rotating assembly. My assumption is that lighter weight means easier on parts i.e. more durable. Light = better throttle response.Are my assumptions flawed? Has anyone used a Ultralight crank in a steel rod type street/odd strip application? Help & comments appreciated. I am married to the idea of getting the crower crank at this stage as they seem to have a good reputation for quality from what I can tell.
Ultra lightweight crankshaft, lightweight pistons and pins, a good set of H or I beam steel rods , your a man after my own heart  Go for it, especailly in a street rod or street and strip car It should rev quickly like a SB Chevy 3.00 inch stroke  BTW, hows the traction onthat car now 
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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Re: Hemi crankshaft
[Re: Keith Black®]
#961364
03/29/11 05:16 AM
03/29/11 05:16 AM
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Joined: Jun 2009
Posts: 1,212
QLD Australia
Keith Black®
OP
pro stock
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OP
pro stock
Joined: Jun 2009
Posts: 1,212
QLD Australia
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.... anyone use a "UltraLight" Crower billet in a durability based application..?
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Darren Beale
Keith Black Racing Engines®
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Re: Hemi crankshaft
[Re: HEMIFRED]
#961369
03/30/11 02:12 AM
03/30/11 02:12 AM
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Joined: Jun 2009
Posts: 1,212
QLD Australia
Keith Black®
OP
pro stock
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OP
pro stock
Joined: Jun 2009
Posts: 1,212
QLD Australia
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thanks Fred, be good to hear from anyone having experience with their lightweight cranks, would make sense to me that a lighter rotating assembly has to be easier on parts - provided it retains strength.
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Darren Beale
Keith Black Racing Engines®
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Re: Hemi crankshaft
[Re: Keith Black®]
#961374
03/31/11 10:17 PM
03/31/11 10:17 PM
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Joined: Jan 2010
Posts: 588
Franklin, TN
23T Hemmee
mopar
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mopar
Joined: Jan 2010
Posts: 588
Franklin, TN
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Darren,
I apologize, I should have read your first post and sig info a little closer. I'm not going to venture too far into advice as the tech for hot street setups has far surpassed my little peanut brain. I definitely agree with Fred on the "no lightweight stuff in a blown motor" at least for full race setups. On the other hand, your's is a little less cut and dried. What compression are you after, don't know what your gas quality is in Oz but most mild blown gas compression targets are around 8:1. That, along with large cubes could make for a fairly (by Hemi standards) light piston. The strength of the Olivers is not in question, although I don't know what they might weigh. I've got a set of 7.350" Carillo's that are 1012 grams, would think your rod weight is going to come in around 900-925. If this were a full-on blown gas motor, I wouldn't even consider steel rods. The normal tuning window is so narrow on blown gas, if you missed it by just a little bit you've knocked the bearings and/or whole bottom end out of it. But in your case, with EFI, you should be able to keep the mix a lot closer to where it needs to be and rod cushioning, or lack of it, shouldn't be an issue. Again, I'm not that familiar with the F2, other than pictures, what cfm/boost is it capable of. I don't think it has the same capabilities as a large Roots blower, at least on a large cube deal like yours, but again, on a street setup I would think it would give you all the boost a gas motor can handle. I don't think the F2 takes as much HP to turn as a large Roots blower would, and the Hemi crank snout is more than strong enough to handle the stresses on the drive belt. I don't think the snout area is any different on the standard or ultra-lite versions, they are all sold as blower cranks. I know the popular consensus is go as lite as possible, and in your case, it may work out for you just fine, but I bet if you did an A-B comparison from the drivers seat you wouldn't feel any difference. Also, there is the possibility given that you are dealing with Hemi piston and rod weights, you might get the Ultra-lite version, only to find that you had to put 3 chunks of Mallory metal in each end, to get it back in balance. Doable obviously, but an unnecessary pain in the tush and pretty much negates the advantage of the lighter weight crank to start with. That probably is better left to Crower to advise you on, I'm really not sure where I was going with all of this, just throwing some things out there for thought. Post more info (rod length, weights, comp, ratio's) when you get a chance.
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Re: Hemi crankshaft
[Re: 23T Hemmee]
#961375
04/08/11 07:36 PM
04/08/11 07:36 PM
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Joined: Jun 2009
Posts: 1,212
QLD Australia
Keith Black®
OP
pro stock
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OP
pro stock
Joined: Jun 2009
Posts: 1,212
QLD Australia
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Thanks Ronny appreciate your reply, apologies has taken a while to get back on this I have been waiting for a reply from Crower, which is below. The engine will run on E85 and final compression will be 8.5:1. I figure I can get 1/2pt extra with the aluminium heads/block & the higher octane of E85 (E85 real octance i understand is 94-96) but runs cooler) Engine will also be intercooled. In my application the F2 will produce 15lbs boost maximum@7000 rpm (max rpm). The rods weigh: * Small end weight: 281 Big end weight: 608 with WSB bolts/614 with ARP 3.5 bolts total rod weight (depending on bolt choice 889-895g (your guess was good!) [final rod bolt choice another question] Reply from Crower: Quote:
".. it was me, I would go with a standard 95168. Lightweight and Ultralight cranks are not recommended in blown applications. Below are the answers to your questions(in red).
The crankshafts I am considering are:
1. Crower #95168 – 4340 Chromoly
>> Forged 76 - 84lbs with or withhout center counterweights, balance to any bob weight(may require heavy metal at an extra cost), $xxxx unbalanced. 4-6 weeks delivery, This is available in EN30B forged also, $xxxx
2. Crower #95168 – ENB30B Billet Steel
>> Same as a the forged crank above but $xxxx and 14-16 weeks delivery.
3. Crower #LW95168 – ENB30B Billet Steel “Lightweight” profile
>> 69-71lbs Does not balance good with bob weights above 2400 grams $xxxx and 14-16 weeks delivery.
4. Crower #UL95168 – ENB30B Billet Steel “Ultralight” profile
>> 56-58lbs Does not balance good with bob weights above 2300 grams $xxxx and 14-16 weeks delivery.
Interesting to note Crower actually recommends the ordinart 4340 crank, which is good news on a cost/delivery basis too.
I wonder what they mean by "with" or "without" centre counterweights??
thanks again Ronny appreciate your thoughts.
Darren
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Darren Beale
Keith Black Racing Engines®
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anyone ..?.. give me any opinions on Crower cranks..?
