Is a 2-step Rev. Limiter bad for the stock crank?

93gtmustang · Nov 11, 2024

I would like to get a 2 step for racing.
I was looking at the MSD6-AL-2.
A fellow racer / mechanic said to me long ago that it puts stress on the crank.
I also saw somewhere that it's not good for the stock Fox Body Mustang crank and other engine related parts?
Does anyone know anything on this?
Thanks!

Noobz347 · Nov 11, 2024

The crank doesn't care.

That OEM cast crank in a stout block with good mains is good to 750 ish+.

It's the [block] that is most susceptible to drivetrain shocks.

How many crank failures have you heard about where a 2 bolt block was involved and not [also] wiped out?

In all the years I've been doing this, I have heard of only one.

93gtmustang · Nov 12, 2024

Noobz347 said:
The crank doesn't care.

That OEM cast crank in a stout block with good mains is good to 750 ish+.

It's the [block] that is most susceptible to drivetrain shocks.

How many crank failures have you heard about where a 2 bolt block was involved and not [also] wiped out?

In all the years I've been doing this, I have heard of only one.

So, it's the block that I have to worry about, not the crank, right?

Bullitt347 · Nov 12, 2024

93gtmustang said:
So, it's the block that I have to worry about, not the crank, right?

Depends on the HP.
Even then, I seriously doubt that a 2-step can hurt anything.

93gtmustang · Nov 12, 2024

Bullitt347 said:
Depends on the HP.
Even then, I seriously doubt that a 2-step can hurt anything.

Only 345 Flywheel horsepower

Noobz347 · Nov 12, 2024

93gtmustang said:
So, it's the block that I have to worry about, not the crank, right?

Perhaps but not until you start getting upwards of 500ish+. Even then lots of things come into play. Deflection, regardless of the cause, is what wrecks OEM Windsors.

Bullitt347 · Nov 12, 2024

A 2-step works by cutting either fuel or spark from random cylinders to keep rpm's in check.
I don't know how cutting load from cylinders to limit rpm can cause any kind of damage.
The engine would have to have a previous underlying condition to even potentially be a concern.

93gtmustang · Nov 13, 2024

Looks like It's no problem using the 2 step.
Thanks for the replies!

Is a 2-step Rev. Limiter bad for the stock crank?

93gtmustang

Noobz347

Stangnet Facilities Maint Tech... Er... Janitor

93gtmustang

Bullitt347

I have been doing it wrong this whole time

93gtmustang

Noobz347

Stangnet Facilities Maint Tech... Er... Janitor

Bullitt347

I have been doing it wrong this whole time

93gtmustang

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