Gm rotor # 1852722 ?

[Jim R.]

Never new this, In the driveline this is listed as a extended tip rotor for hi rpm performace for the 60's gm engines, what do you guys know about this and how much of a difference will it make if your car has the standard tip not extended.

[Joe R.]

Re: Gm rotor # 1852722 ?

Jim,

I seem to have a vague recollection of a Restorer article on this subject in the last few years. I think Bill Clupper was the author.

Joe

[Jim R.]

Re: Gm rotor # 1852722 ?

Joe, I will look back in my restorer mags today to see if I can find that article, the nov-dec 11 driveline page 97 is where I had first learned about this K&B rotor. Jim

[Wayne M.]

Re: Gm rotor # 1852722 ?

I bought one of the K&B rotors at Carlisle, last summer. Haven't tried it out yet. I'm surprised they're using the GM part # 1852722 in their description. Here's two D426R's I bought over the last decade; one in unopened box, which I assume is also white plastic. I'm thinking that this is the V8 service rotor for many years (began sometime after 1970, anyway). You C3 guys: were they TFP to 1974 ?

Any problems using with a distributor cap with the "R" ? [I'm thinking of the Delco Patent 2769047], which is where I'm presently running the white D426R.

[Gene M.]

Re: Gm rotor # 1852722 ?

From what I can measure, there is about .052" difference between the later one as compared to the extended version.

[Dick W.]

Re: Gm rotor # 1852722 ?

Jim,

I seem to have a vague recollection of a Restorer article on this subject in the last few years. I think Bill Clupper was the author.

Joe

Think it was Bill Sangrey

[Mike M.]

Re: Gm rotor # 1852722 ?

Buy the accell rotor.its right on and cheaper.mike

[Joe R.]

Re: Gm rotor # 1852722 ?

Jim,

Did you find the article? If not, I would recommend sending an email to Vinnie Peters. I imagine he can email you a copy of it.

Joe

[William C.]

Re: Gm rotor # 1852722 ?

I believe '74 was the first year for the white rotor, but for several years before that, Delco had a black rotor with an "E" stamped on it, also a POS with a shortened tip.

[Timothy B.]

Re: Gm rotor # 1852722 ?

Bill,

Refresh my memory, what's the purpose for the shortened tip rotor and did the E stand for emissions?

[Ken A.]

Re: Gm rotor # 1852722 ?

Buy the accell rotor.its right on and cheaper.mike

Actually it's not. See the article in July 2011 Auto Enthusiast. An "old" Accel rotor was close, but not the current stuff.

[William C.]

Re: Gm rotor # 1852722 ?

Supposedly it had the effect of raising the system voltage to fire the charge. Unfortunately (at least to a poor dumb ME) it doesn't make any sense from an e=ir standpoint as the 12v system energy doesn't really change it's energy capacity, and the rather abysmal results when one is used in an 11-1 compression engine would seem to verify my analysis on that point.

[Jim R.]

Re: Gm rotor # 1852722 ?

Found it Joe, volume 36 number 1 summer 2009, Run The Redline by Bill Clupper.

Jim,

Did you find the article? If not, I would recommend sending an email to Vinnie Peters. I imagine he can email you a copy of it.

Joe

[Jim R.]

Re: Gm rotor # 1852722 ?

I looked to see what I had put in for a rotor in my 65 327 I have MSD #8467 I wonder how this one compares .

[Paul H.]

Re: Gm rotor # 1852722 ?

Haven't measured them but I must agree with Mike. My cars could not run better than they do with the Accell rotors. I also like their points.