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Re: damage from 2 step launch rev limiter? V.s pneumatic SLC [Re: cudaman1969] #2919061
05/05/21 08:45 PM
05/05/21 08:45 PM
Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY Offline
Master
MR_P_BODY  Offline
Master

Joined: Jun 2003
Posts: 52,972
Romeo MI
On my MSD 2 step I cracked the same cylinder on TWO blocks in damn near the same spot on both engines.. I had
measured the walls on the block to try to eliminate different issues and as far as I know I couldnt find
anything wrong except the crack.. I was told later by a so called big time engine builder the the MSD 2 step
is hard on the block.. since that time I never used the 2 step.. now days I just put my foot to the floor
on the trans brake(stalled the engine at 6200 rpm) and never had a problem since
wave

Re: damage from 2 step launch rev limiter? V.s pneumatic SLC [Re: MR_P_BODY] #2919243
05/06/21 11:04 AM
05/06/21 11:04 AM
Joined: Mar 2003
Posts: 9,091
Rogue River, OR
Jeremiah Offline
master
Jeremiah  Offline
master

Joined: Mar 2003
Posts: 9,091
Rogue River, OR
I am just a casual tinkerer/hobbyist and the old school analog MSD 2-step makes me cringe. The new rev limiters are much smoother. I have an add on digital Pertronix rev limiter that is smooth as silk. It took me a second to figure out what was happening the first time I hit it. The cool thing about that little box is that it also provides a nice clean tach signal for the NOS mini progressive. : D

You have to think it beats the heck out of the timing chain but what do I know. I imagine folks running a belt drive will have less ill effect of the (bang bang bang) MSD 2-step. You put an analog MSD (6AL, 7AL) powered car on the 2-step in the city and watch people duck or hit the deck lol.



Re: damage from 2 step launch rev limiter? V.s pneumatic SLC [Re: Jeremiah] #2919822
05/07/21 10:08 PM
05/07/21 10:08 PM
Joined: Dec 2008
Posts: 201
Illinois
gearhead01 Offline
enthusiast
gearhead01  Offline
enthusiast

Joined: Dec 2008
Posts: 201
Illinois
I have an SLC in the Road Runner. This was in the car when I bought it.

I like taking advantage of the accelerator pump action on the launch.

Engine speed is 1500 to 1700 RPM when the throttle pedal is matted. Not as high ans most 2-steps.

I think i get a little more of a hit from the torque converter coming off of a lower RPM.

John


1971 Satellite Sebring Plus - 14.46 @ 95.43
1977 Road Runner - N/B 11.02@ 119 Drag Radials
Re: damage from 2 step launch rev limiter? V.s pneumatic SLC [Re: gearhead01] #2919828
05/07/21 10:29 PM
05/07/21 10:29 PM
Joined: Jan 2003
Posts: 7,471
Minnesota
Hemi_Joel Offline OP
master
Hemi_Joel  Offline OP
master

Joined: Jan 2003
Posts: 7,471
Minnesota
Great info, guys. It gives me a lot to consider. Thanks everyone!

Years back, I used an adjustable idle step up solenoid acting on the throttle linkage, hooked up to a switch on the dash. I would flip the switch to bump it up to my pre-adjusted launch RPM, then shut it off once I was done shifting. If I was on a pro tree, I tried to stage last so I could turn it on after 3 bulbs were lit, then feather the clutch to stage. If I was on a sportsman tree, I had more time so it didn't matter who staged last. It actually worked OK.


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31 Plymouth Coupe, 392 Hemi, T56 magnum
RS23J71
RS27J77
RP23J71
RO23J71
WM21J8A
I don't regret the things I've done. I only regret the things I didn't do.
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