Who makes the strongest LSx crank???
09-22-2008, 02:37 PM
#21
We already have a good dry sump. Its initally setup for a big block chevy, 5 stages, divider pan. We've got more than enough volume and oil pressure. Oil pressure on the big end is 110-120psi.
We're going with a Sonny Bryant crank, 2 custom pieces on the block and a couple other changes to see if we can get it to live @ 2500hp and 8500-9000rpms.
We're going with a Sonny Bryant crank, 2 custom pieces on the block and a couple other changes to see if we can get it to live @ 2500hp and 8500-9000rpms.
The problem is that you'll forget you ordered it by the time it shows up.
09-22-2008, 11:57 PM
#22
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Billit Cranks! Im Sort Of Old School Butt Has Anybody Thought Of Using A Velasco Crank! His Crank Alloy Handles 10,000hp&9,000lbft Of Torque Every Day! Ive Seen Guys Using His Cranks W/cracks In Promod, Nitrocoup,etc.etc. For Years W/no Failure!
By The Way He Makes Custom Cranks For Anything,
562/862-3110
ASK FOR HENRY
By The Way He Makes Custom Cranks For Anything,
562/862-3110
ASK FOR HENRY
09-23-2008, 04:35 AM
#23
According to my calculation, the forces that are seen at 7500 vs 9000 are a HUGE difference, I cacculated the stored energy in a 50 lb 6 inch diameter weight that was sipnning at 7500, then at 9000, and that # alone tells me that the potential of the RPM alone being the issue is very high.
There's no way to make the power without that kind of RPM is there? I assume no, but I have to ask.
What about the tranny... input shaft speeds like that cause any problems there?
09-23-2008, 06:26 AM
#24
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I have a 4 inch crank in my motor but it's only seeing 7000 going down the track, every now and then in the burnout box it might jump to 7500 if I whack it too hard to get the tires spinning.
According to my calculation, the forces that are seen at 7500 vs 9000 are a HUGE difference, I cacculated the stored energy in a 50 lb 6 inch diameter weight that was sipnning at 7500, then at 9000, and that # alone tells me that the potential of the RPM alone being the issue is very high.
There's no way to make the power without that kind of RPM is there? I assume no, but I have to ask.
What about the tranny... input shaft speeds like that cause any problems there?
According to my calculation, the forces that are seen at 7500 vs 9000 are a HUGE difference, I cacculated the stored energy in a 50 lb 6 inch diameter weight that was sipnning at 7500, then at 9000, and that # alone tells me that the potential of the RPM alone being the issue is very high.
There's no way to make the power without that kind of RPM is there? I assume no, but I have to ask.
What about the tranny... input shaft speeds like that cause any problems there?
09-23-2008, 07:17 AM
#25
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09-23-2008, 07:57 AM
#26
Fireball I understand that... my thoughts were on the rear gear like Robin stated, and then the possibility that maybe a 3 speed so teh car will get out of the hole good woul d work better. I know that TH400 isn't really gonna be reliable enough though... you guys might be at the point where a bruno/lenco style tranny is needed.
09-23-2008, 07:59 AM
#27
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My truck went 1.44 60' with 3.25 rear gears and a 1.80 PG and that was when it was running bottom 10 teens. (a little over 3600lbs) I dont think these guys need the 1st gear when you are talking about being able to make 2-3x's the HP. I had put 3.25s in it to soften the 1st gear on the TH400 that I never got reliable.
09-23-2008, 08:01 AM
#28
I think alot of these guys are running 1.69 powerglides, and they are running a 30 inch tall tire. Plus to run the #'s they need to run they need to be cutting 1.28 to 1.25 60 foots I think.
To get a car with a 3.25 rear gear and a 30 inch tire to 60 foot in the 1.2x range, plus being a turbo car that you can only build X amount of boost on the line with starts getting a little difficult I'd think.
With a 2.x first gear they could run a 3.0 rear gear and not have to spin so many rpm's to get to the mph needed, and the cars would probably leave better.
Question is, can the power that's needed be made with less RPM, or is that where the motors/turbo's need to be?
To get a car with a 3.25 rear gear and a 30 inch tire to 60 foot in the 1.2x range, plus being a turbo car that you can only build X amount of boost on the line with starts getting a little difficult I'd think.
With a 2.x first gear they could run a 3.0 rear gear and not have to spin so many rpm's to get to the mph needed, and the cars would probably leave better.
Question is, can the power that's needed be made with less RPM, or is that where the motors/turbo's need to be?
09-23-2008, 08:25 AM
#29
Anyone can do the math.....
30" tire
1.0 final drive
3.50 gear
195mph = 7650 driveshaft RPMs
8% converter slip
8300 engine RPMs
200mph = 7850
8500 engine RPM
So the guys doing the LSx testing saying it will live @ 2000hp but are limiting the testing to 7000 is merely that a test. We're not racing the motors on a dyno. If the LSx was built like a small block chevy or a Big Block chevy we would not have the problems everyone is seeing.
30" tire
1.0 final drive
3.50 gear
195mph = 7650 driveshaft RPMs
8% converter slip
8300 engine RPMs
200mph = 7850
8500 engine RPM
So the guys doing the LSx testing saying it will live @ 2000hp but are limiting the testing to 7000 is merely that a test. We're not racing the motors on a dyno. If the LSx was built like a small block chevy or a Big Block chevy we would not have the problems everyone is seeing.
09-23-2008, 09:50 AM
#32
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I think alot of these guys are running 1.69 powerglides, and they are running a 30 inch tall tire. Plus to run the #'s they need to run they need to be cutting 1.28 to 1.25 60 foots I think.
To get a car with a 3.25 rear gear and a 30 inch tire to 60 foot in the 1.2x range, plus being a turbo car that you can only build X amount of boost on the line with starts getting a little difficult I'd think.
With a 2.x first gear they could run a 3.0 rear gear and not have to spin so many rpm's to get to the mph needed, and the cars would probably leave better.
Question is, can the power that's needed be made with less RPM, or is that where the motors/turbo's need to be?
To get a car with a 3.25 rear gear and a 30 inch tire to 60 foot in the 1.2x range, plus being a turbo car that you can only build X amount of boost on the line with starts getting a little difficult I'd think.
With a 2.x first gear they could run a 3.0 rear gear and not have to spin so many rpm's to get to the mph needed, and the cars would probably leave better.
Question is, can the power that's needed be made with less RPM, or is that where the motors/turbo's need to be?
09-23-2008, 11:02 AM
#34
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Yes, there is a big difference in running Outlaw Radial, I understand. Are there turbo cars running 1.20-1.23s on radials? I havent seen any but that doesnt mean they don't exist.
Sorry this is completely off topic.
Sorry this is completely off topic.
09-24-2008, 11:31 AM
#37
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Turbo cars you say? Cool I didnt realize they were that quick I thought mid/high 20s was the 'norm' on turbos. Wolfe went 24 the other night when he went 4.70 I think I read.
Last edited by Frank02L; 09-24-2008 at 11:43 AM.
03-01-2009, 09:49 PM
#38
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So the guys doing the LSx testing saying it will live @ 2000hp but are limiting the testing to 7000 is merely that a test. We're not racing the motors on a dyno. If the LSx was built like a small block chevy or a Big Block chevy we would not have the problems everyone is seeing.
I only know LSx architecture.
What are the differences you speak of, in reference to the cranks reliability?
