Rocketman!442

Hi Folks: I;ve been fighting with a brand new MSD Pro Billet Plug n play for Olds Big Block. I followed the instructions to a tee, but the rev limiter would not take??? I sent the unit back to MSD, but it did not get repaired?? My mechanic suggested going with an external Circle track rev-limiter, which I bought, with no help from MSD?? It now works like a charm, but it would have been nice to get some feedback or help from MSD??? I am thinking it is a Chinese knock-off, but they didn't admit to that?? I pulled full price for this Dissy from a reputable Speed Shop.

RandyS

Just curious why you need a rev limiter on an Olds motor? They don't typically rev high enough to tear themselves apart.

droldsmorland

Is it a 6AL box? I assume its matched to the distributor part number? If so whats the range resolution on the limit? You need clean dedicated grounds on the MSD systems. What did MSDs tech line say?

Rocketman!442

The Pro Billet Plug n Play don't need a 6AL box, the rev limiter is advertised as internal. MSD Tech line left me hanging about a year ago??? The limiter goes from 3000-10000 RPM. Works slick now that we've installed the CT2727RL. Would have been nice to know this up front and would have saved me from cooking my old Mallory built in rev limiter tach. Wayns

Rocketman!442

Rocketman!442

I have drag raced Oldsmobiles for several decades as long as several other brands and I can tell you that power-shifting a built 455 you pray not to blow a driveshaft because this engine will peak so quickly you won't have a chance to catch it. My rev limiters have saved me on several occasions at the track, 3 blown driveshafts, two Muncies, I 12 bolt differential yoke, one clutch, each one could have led to it scattering??
Wayne

oldcutlass

What is a CT2727RL?

Rocketman!442

It's an external rev limiter for use with HEI distributors CT like Circle track, P/N 2727, and RL for rev limiter. Adjustable in 100 RPM increments, soft-touch hit. Works slick.
Wayne

Rocketman!442

Rocketman!442

If you don't need one you must have a big Chebbie in there???
LOL Wayne

oldcutlass

Interesting piece and stand alone. Do you run it inside the engine compartment or inside the cabin? Not that I need one.
https://www.summitracing.com/parts/msd-8727ct

droldsmorland

Surprises me that MSD let you down. I'd pursue that.

Rocketman!442

Rocketman!442

Yes you run it under the hood, away from heat, and so you can see the read-out, and tattle-tale features. Easy to adjust, and the soft-touch is subtle,not the bone shaker that the old Mallory limiters were.