What was a 3/4 race cam any how?
#473446
09/20/09 04:14 PM
09/20/09 04:14 PM
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Posts: 12,419 Kalispell Mt.
HotRodDave
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Where did that terminology come from? Was it a specific cam some certain company made like the duntov 30-30 cam? I always hear the old timers throwing it around and know it was some kinda high performance cam but what were they running and calling 3/4 race cams?
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Re: What was a 3/4 race cam any how?
[Re: HotRodDave]
#473449
09/20/09 04:32 PM
09/20/09 04:32 PM
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Joined: Jun 2009
Posts: 644 Minnesota
Barnstorm
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Minnesota
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Goes back farther than I can remember. Flathead Ford days, and prolly into the 40's. Honest Charley asked if you wanted 3/4 race or full race cam. No other choices.
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Post deleted by Defbob
[Re: DaytonaTurbo]
#473451
09/20/09 04:57 PM
09/20/09 04:57 PM
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Anonymous
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Re: What was a 3/4 race cam any how?
#473452
09/20/09 05:04 PM
09/20/09 05:04 PM
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Bad340fish
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If your real serious you go 3/4 past full race.
68 Barracuda Formula S 340
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Re: What was a 3/4 race cam any how?
[Re: 10 o to go]
#473454
09/20/09 06:36 PM
09/20/09 06:36 PM
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Joined: Aug 2003
Posts: 43,251 Bend,OR USA
Cab_Burge
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I Win
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Bend,OR USA
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One of the first fiction hot rod car books that I read as a kid,(Before dirt was invented )was a story about two kids in the midwest in the mid fiftys that had model A and T Fords when they where in high school.One of them entered his car into a car show for a weekend, one of the other guys with a car in the show sold him and help install a Potvin "3/4" race cam for his 1948 Mercury flat head(they both had 1948 Mercs. in there cars) because the first guy had bought a "full" race cam from Potvin so he could go faster. As already said back then(when I was in Jr and Senoir high school) no one knew what the lift, duration, overlap or lobe centers where, let alone what that meant Lots of people "" " still don't I still have several of them "3/4" race cams that was ground last week by Comp Cams, do you want to race
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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Re: What was a 3/4 race cam any how?
[Re: HotRodDave]
#473455
09/20/09 06:53 PM
09/20/09 06:53 PM
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Joined: Jul 2006
Posts: 9,366 Lehigh Acres, Florida
rickstershemi
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OK....got the following info here: http://www.tildentechnologies.com/Technical/Take_34Race.htmlWhat's a 3/4 Race Cam? In the early 1950's the most popular original camshaft designers were the legendary Ed Winfield, the father of hotrodding, and Cliff Collins of Harman-Collins. If you look a Huntington's 1951 book you will find the specs for their cams listed. We've also listed some of their cams on our Flathead Performance Cams page. There were lots of cam grinders that copied Winfield and Harman-Collins cams, but these two were the designers and innovators in the early days. It was popular to refer to cams as a 1/2 Race or Semi grind and a Full Race grind. Later, there was a call for an intermediate grind between these two. To fill this demand, Ed Winfield took the intake lobe from his full race cam and the exhaust lobe from his semi cam and called it a 3/4 Race cam (see Flathead Performance Cams). It was literally half way between a full race and 1/2 race cam. Since that time, 3/4 Race has become a generic term for a high performance street cam, i.e. something less than a race cam. Sounds pretty logical Rickster
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