Two step and a stock crank?

racer913 · 09-27-2007, 09:50 PM

Will a stock crank hold up to a 2 step is a 2 step hard on a crank?

Mike Pearson · 09-28-2007, 03:52 PM

If you are running a small block chevy you should not have a problem with a stock crank. I have used stock cast and steel cranks in my super stocker with no failures. That would be a 350 cu in. What type of engine are you using?

Mike

Dave Goob Cook · 09-29-2007, 09:43 AM

Opinions vary on the damage of a 2-step, I like to keep my 2-step time to a minimum, would never consider using a 3-step for the burnout.
The higher the 2-step setting, the better off you are also, I feel pretty comfortable with it down to about 3200 RPM's.
I've been running race prepped cast cranks for years, at high compression ratios, they seem to hold up just as well as production steel cranks......or better.

SPT3780 · 10-02-2007, 05:38 PM

Right now I'm up to 33 runs on a 30 year old factory 360 Dodge shortblock footbraking on the 2-step @ 2500-2900 rpm's. It was from the junkyard with unknown miles, just took it apart and put new rings and bearings in it.

I'm hoping it at least lasts for the rest of this month, then my racing is done. I'll let you know if anything happens. My other motor made it well over 100 passes with factory cast crank before I spun a bearing, and it had high compresion. The bearing didn't spin because of the 2-step.

Adger Smith · 10-02-2007, 07:30 PM

Dave,
Please explain why you would not use a 3 step in the burnout, yet get on the 2 step for the leave?

Dave Goob Cook · 10-03-2007, 09:04 AM

Quote:

Originally Posted by Adger Smith

Dave,
Please explain why you would not use a 3 step in the burnout, yet get on the 2 step for the leave?

I'm on the 2-step for less than 1.5 seconds on the launch, don't like washing the cylinders with a 3-step in the burnout, plus, my car won't hook dead on the converter, or I'd not be using the 2-step.

Adger Smith · 10-03-2007, 11:03 AM

Well, good points. I am with you on the 2 step on the leave. I hate to see someone stage & got W/O on the 2 step, esp when their opponent hasn't lit both bulbs. As far as the 3 step on the Burnout I have always used it as a safety. I use it as a catch point, not the RPM of the burnout. I use the throttle to control tire speed & if I happen to hit the chip it is usually just for a split second at the end of the burnout. I'm a firm believer that engines need to be kept below an RPM that causes vlave train damage. This is especially true in FREE Spin RPM's. I also like to keep the RPM of the burnout at or just below the stall of the converter to build a little heat. I'm not sure about the Washing cylinders you mentioned, but long periods of time "ON" the chip will cool cylinders. I have studied those effects with several engines on the dyno. As far as Dead Hooking these little engines I run, That's not an option when you want the best E.T. I have always tried make the converter have max torque multiplication. You can kill that leaving at max stall. That's why I feel a 2 step is best used to control consistant leave RPM's.
My .02 for free

Dave Goob Cook · 10-04-2007, 11:56 AM

I am so with you on the free rev RPM thing, destroys more engines than anything right there!
Using it as a limiter is great, but I see so many people in the bracket world that just put it on the chip for the entire burnout.....
I just view the two-step as a necessary evil......for sure wouldn't run anything other than the MSD soft touch setup.

09-27-2007, 09:50 PM	#1
racer913 Junior Member Join Date: Aug 2007 Posts: 69 Likes: 2 Liked 0 Times in 0 Posts	Two step and a stock crank? Will a stock crank hold up to a 2 step is a 2 step hard on a crank?

09-28-2007, 03:52 PM	#2
Mike Pearson VIP Member Join Date: Mar 2007 Posts: 2,454 Likes: 616 Liked 1,940 Times in 584 Posts	Re: Two step and a stock crank? If you are running a small block chevy you should not have a problem with a stock crank. I have used stock cast and steel cranks in my super stocker with no failures. That would be a 350 cu in. What type of engine are you using? Mike __________________ Mike Pearson 2485 SS

09-29-2007, 09:43 AM	#3
Dave Goob Cook Member Join Date: Dec 2006 Location: Indy Posts: 422 Likes: 0 Liked 0 Times in 0 Posts	Re: Two step and a stock crank? Opinions vary on the damage of a 2-step, I like to keep my 2-step time to a minimum, would never consider using a 3-step for the burnout. The higher the 2-step setting, the better off you are also, I feel pretty comfortable with it down to about 3200 RPM's. I've been running race prepped cast cranks for years, at high compression ratios, they seem to hold up just as well as production steel cranks......or better.

10-02-2007, 05:38 PM	#4
SPT3780 Junior Member Join Date: Sep 2007 Posts: 2 Likes: 0 Liked 0 Times in 0 Posts	Re: Two step and a stock crank? Right now I'm up to 33 runs on a 30 year old factory 360 Dodge shortblock footbraking on the 2-step @ 2500-2900 rpm's. It was from the junkyard with unknown miles, just took it apart and put new rings and bearings in it. I'm hoping it at least lasts for the rest of this month, then my racing is done. I'll let you know if anything happens. My other motor made it well over 100 passes with factory cast crank before I spun a bearing, and it had high compresion. The bearing didn't spin because of the 2-step.

10-02-2007, 07:30 PM	#5
Adger Smith VIP Member Join Date: Dec 2001 Location: Texarkana Ark/TX Posts: 2,446 Likes: 575 Liked 880 Times in 311 Posts	Re: Two step and a stock crank? Dave, Please explain why you would not use a 3 step in the burnout, yet get on the 2 step for the leave? __________________ Adger Smith (Former SS)

10-03-2007, 11:03 AM	#7
Adger Smith VIP Member Join Date: Dec 2001 Location: Texarkana Ark/TX Posts: 2,446 Likes: 575 Liked 880 Times in 311 Posts	Re: Two step and a stock crank? Well, good points. I am with you on the 2 step on the leave. I hate to see someone stage & got W/O on the 2 step, esp when their opponent hasn't lit both bulbs. As far as the 3 step on the Burnout I have always used it as a safety. I use it as a catch point, not the RPM of the burnout. I use the throttle to control tire speed & if I happen to hit the chip it is usually just for a split second at the end of the burnout. I'm a firm believer that engines need to be kept below an RPM that causes vlave train damage. This is especially true in FREE Spin RPM's. I also like to keep the RPM of the burnout at or just below the stall of the converter to build a little heat. I'm not sure about the Washing cylinders you mentioned, but long periods of time "ON" the chip will cool cylinders. I have studied those effects with several engines on the dyno. As far as Dead Hooking these little engines I run, That's not an option when you want the best E.T. I have always tried make the converter have max torque multiplication. You can kill that leaving at max stall. That's why I feel a 2 step is best used to control consistant leave RPM's. My .02 for free __________________ Adger Smith (Former SS)

10-04-2007, 11:56 AM	#8
Dave Goob Cook Member Join Date: Dec 2006 Location: Indy Posts: 422 Likes: 0 Liked 0 Times in 0 Posts	Re: Two step and a stock crank? I am so with you on the free rev RPM thing, destroys more engines than anything right there! Using it as a limiter is great, but I see so many people in the bracket world that just put it on the chip for the entire burnout..... I just view the two-step as a necessary evil......for sure wouldn't run anything other than the MSD soft touch setup.