Previous Thread
Next Thread
Print Thread
Are MP cams really old Racer Brown designs? #1022567
06/29/11 08:32 AM
06/29/11 08:32 AM
Joined: Oct 2007
Posts: 733
New York
R/T1968R/T Offline OP
super stock
R/T1968R/T  Offline OP
super stock

Joined: Oct 2007
Posts: 733
New York
I was under the assumption that the MP grinds were Racer Brown profiles. When I compared the MP 509 to the SSH-44 the duration is different. Were these really taken at 50 degrees?

MP 509 292 248 at 50
SSH-44 510 292 242 at 50

Re: Are MP cams really old Racer Brown designs? [Re: R/T1968R/T] #1022568
06/29/11 09:00 AM
06/29/11 09:00 AM
Joined: Jun 2008
Posts: 3,913
usa
L
lewtot184 Offline
master
lewtot184  Offline
master
L

Joined: Jun 2008
Posts: 3,913
usa
many years ago mopar would give part numbers to aftermarket cams, racer brown was one of these. the newer purple cams took some ques from the old racer brown profiles but aren't racer browns. i believe mopar did contract with a cam grinder years ago to develope some profiles but i'm pretty sure it wasn't racer brown.

Re: Are MP cams really old Racer Brown designs? [Re: lewtot184] #1022569
06/29/11 10:03 AM
06/29/11 10:03 AM
Joined: Nov 2009
Posts: 2,177
ill
D
dennismopar73 Offline
top fuel
dennismopar73  Offline
top fuel
D

Joined: Nov 2009
Posts: 2,177
ill
Quote:

many years ago mopar would give part numbers to aftermarket cams, racer brown was one of these. the newer purple cams took some ques from the old racer brown profiles but aren't racer browns. i believe mopar did contract with a cam grinder years ago to develope some profiles but i'm pretty sure it wasn't racer brown.




the old dc cams where of racer brown origins not m p , built to dc specs,

Re: Are MP cams really old Racer Brown designs? [Re: R/T1968R/T] #1022570
06/29/11 11:25 AM
06/29/11 11:25 AM
Joined: Oct 2007
Posts: 733
New York
R/T1968R/T Offline OP
super stock
R/T1968R/T  Offline OP
super stock

Joined: Oct 2007
Posts: 733
New York
Why are the specs different?

Re: Are MP cams really old Racer Brown designs? [Re: R/T1968R/T] #1022571
06/29/11 05:29 PM
06/29/11 05:29 PM
Joined: Aug 2007
Posts: 6,089
Valencia, España
NachoRT74 Offline
master
NachoRT74  Offline
master

Joined: Aug 2007
Posts: 6,089
Valencia, España
dunno the rest, but the MP 284/480 has its own similar on Crane grinds line. Same on everything


With a Charger born in Chrysler assembly plant in Valencia, Venezuela
Re: Are MP cams really old Racer Brown designs? [Re: R/T1968R/T] #1022572
06/29/11 05:40 PM
06/29/11 05:40 PM
Joined: Nov 2009
Posts: 2,177
ill
D
dennismopar73 Offline
top fuel
dennismopar73  Offline
top fuel
D

Joined: Nov 2009
Posts: 2,177
ill
patm pending,
the dc cams where of racer brown origins, spec by dc
the mp cams could have been either crane or racer brown origins still they wont have same # due to pat infrengments

Re: Are MP cams really old Racer Brown designs? [Re: dennismopar73] #1022573
06/29/11 06:15 PM
06/29/11 06:15 PM
Joined: Jun 2008
Posts: 102
Colo
P
PJ68RT Offline
member
PJ68RT  Offline
member
P

Joined: Jun 2008
Posts: 102
Colo
The duration #'s MP lists are suspect...at best. Here's a link that has some updated info.

http://victorylibrary.com/mopar/mpcam-tech-c.htm

Read in the cam notes to find the updated specs. 509 cams looks to be closer to 242 @ .050

Last edited by PJ68RT; 06/29/11 06:17 PM.
Re: Are MP cams really old Racer Brown designs? [Re: R/T1968R/T] #1022574
06/29/11 09:52 PM
06/29/11 09:52 PM
Joined: Nov 2009
Posts: 2,275
Desert Tracker
H
HYPER8oSoNic Offline
top fuel
HYPER8oSoNic  Offline
top fuel
H

Joined: Nov 2009
Posts: 2,275
Desert Tracker
Quote:

Why are the specs different?




When Chrysler engineers (later MP developers) took notes from the "older" grinds to make them much more powerful (better torque as well as best hp for each grind) as well as driveability. They may have "tweaked" the ramps and flanks of the cams to go with the better cam technology (read: faster acting) of today!!



"Stupidity is Ignorance on Steroids"
"Yeah, it's hopped to over 160" (quote by Kowalski in the movie Vanishing Point 1970 - Cupid Productions)
Re: Are MP cams really old Racer Brown designs? [Re: R/T1968R/T] #1022575
06/29/11 11:16 PM
06/29/11 11:16 PM
Joined: Dec 2008
Posts: 176
Rome, GA
G
GTXX Offline
member
GTXX  Offline
member
G

Joined: Dec 2008
Posts: 176
Rome, GA
the two cams that you're comparing are similar in lift and duration only, every other spec. is different and they run different.

Re: Are MP cams really old Racer Brown designs? [Re: GTXX] #1022576
06/30/11 10:39 AM
06/30/11 10:39 AM
Joined: Oct 2007
Posts: 733
New York
R/T1968R/T Offline OP
super stock
R/T1968R/T  Offline OP
super stock

Joined: Oct 2007
Posts: 733
New York
Have you had any experience with the SSH-44. I have a new one purchased in the 70s that I may want to try

Re: Are MP cams really old Racer Brown designs? [Re: R/T1968R/T] #1022577
06/30/11 02:29 PM
06/30/11 02:29 PM
Joined: Jun 2008
Posts: 3,913
usa
L
lewtot184 Offline
master
lewtot184  Offline
master
L

Joined: Jun 2008
Posts: 3,913
usa
Quote:

Have you had any experience with the SSH-44. I have a new one purchased in the 70s that I may want to try


i used one in the early '70's. i don't think i'd use it in anything but a 440 4spd. it's actually got about 304 degrees of seat timing. back in the day racer brown cams had an odd advertised duration. its been many years ago but i think some of the advertised numbers were at .017" lift. his catalogs had a wealth of tech info for the time period.
i remember calling "Racer" and talking on the phone about my big ideas. he was very nice and would talk for hours, but you had to call at night. there is a lot of automotive history with Racer and his brother. Racer was the tech editor for hot rod magazine back in the fifties. i have some early fifties mags and still enjoy looking at them. we used to run his cams back in the late '60s to early '70s.

Re: Are MP cams really old Racer Brown designs? [Re: lewtot184] #1022578
07/01/11 11:48 AM
07/01/11 11:48 AM
Joined: Jan 2003
Posts: 16,376
D
dogdays Offline
I Live Here
dogdays  Offline
I Live Here
D

Joined: Jan 2003
Posts: 16,376
I, also think it's a pretty big cam with not a lot of lift for the duration. I bet your favorite cam company could regrind it to a more modern profile and you'd know the cam core was good.
R.







Powered by UBB.threads™ PHP Forum Software 7.7.1