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  #1  
Old 12-24-2001, 02:24 AM
dusterguy dusterguy is offline
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Location: Alberta, Canada
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Question What the hell is this?

I was reading the local car trader, and there is usually alot of old cars in there, and i just check it out for something to do. Well, I came across alot of chevies, and there "built up" engines. There seemed to be alot of 3/4 cams in these engines. My question is, what the hell is a 3/4 cam?
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Duster Mods: Pulled out the old /6, and put a freshly built 360 bored .030". ~9.2:1, Mild Port and Polished heads, 292? and .508" lift mopar camshaft, Carter 625 AFB, edelbrock preformer RPM, Electric Fan from Summit, Electronic ignition with MSD 6A, 8 3/4, 3.91 posi, Flomaster Headers (and yes there are many dents from pot holes and man holes, they have been patched many times, best run 14.05 (I think it will be much better once i get some proper tuning done)

'Doba: 400ci, 4bbl, Pulled off old Lean Burn, and replaced with MSD ignition and ran great, now it doesn't start, rebuilt thermoquad, corneathian leather 6-way power buckets (oh so soft!!), and every possible option under the sun, 66,000 kms.

My Cars:
1975 Duster, 360ci
1977 Cordoba, 400ci
1968 Monacco 500, 383ci
1976 Dodge Arrow 1.6L (my rally car)
1981 Trans Am 301ci (second project, sorry guys)
1991 Nissan Stanza (daily driver)
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  #2  
Old 12-24-2001, 04:15 AM
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rb77413 rb77413 is offline
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I guess it is a 6 cylinder cam. Like sticking a v6 cam in a v8 3/4 of a v8 Honestly I've always wondered that my self.
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  #3  
Old 12-24-2001, 05:30 AM
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Christopher Christopher is offline
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It's a old term used to describe a "3/4 race cam".The engine's cam has specs that are almost the same as a race cam.So I tell people I guess the engine only has 3/4 of a race cam in it and that 2 of the cylinders are not working??
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  #4  
Old 12-24-2001, 08:58 AM
sanborn sanborn is offline
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Those terms were used in the 50s to describe common aftermarket camshafts used primarily in Ford Flathead/Chevrolet 6 cylinder engines. Common terms were:
Sportsman Grind-Usually a cam with slightly more lift and duration than stock, no noticeable change in idle, oftentimes a sportsman cam didn't require a change in lifters. Stock lifters in Flatheads were non adjustable, they required grinding to change clearance. A time consuming process.

3/4 Race-Generally considered a cam that was pretty radical but still driveable on the street. Noticeably lopey idle. Required change in lifters and springs. About all the cam an engine could handle and still cruise the drive in restaurants.

Full Race-Camshaft was so radical it could only be used for racing purposes only.

There were other terms used(export cam, etc.) but those were the most prevalent. It didn't take much of a cam to put it in the Full Race category. Cars back in the 50s weighed 3200-4300 lbs. powered by engines of 220-255 cubic inches producing all of 100-150HP.

The guy writing the ad must be a geezer like me. Hope the brief history lesson helped.
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  #5  
Old 12-24-2001, 10:41 AM
Billydelrio Billydelrio is offline
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Default 15/16 race cam!

Just a thought.
I would guess that a circle track racer now uses cam terms like "3/4 flat" and "3/4 banked" to describe what tracks the cam is used at. I have seen cams described in that manner in recent times.

Billy
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  #6  
Old 12-24-2001, 11:02 AM
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waynebo waynebo is offline
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3/4 banked and 3/4 flat are refering to the track size and shape i.e flat or banked. waynebo
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  #7  
Old 12-25-2001, 04:46 PM
dusterguy dusterguy is offline
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Thanks, that makes sense now. Maybe it was an old-timer writing the ad (just joking around with you)

thanks
__________________
Duster Mods: Pulled out the old /6, and put a freshly built 360 bored .030". ~9.2:1, Mild Port and Polished heads, 292? and .508" lift mopar camshaft, Carter 625 AFB, edelbrock preformer RPM, Electric Fan from Summit, Electronic ignition with MSD 6A, 8 3/4, 3.91 posi, Flomaster Headers (and yes there are many dents from pot holes and man holes, they have been patched many times, best run 14.05 (I think it will be much better once i get some proper tuning done)

'Doba: 400ci, 4bbl, Pulled off old Lean Burn, and replaced with MSD ignition and ran great, now it doesn't start, rebuilt thermoquad, corneathian leather 6-way power buckets (oh so soft!!), and every possible option under the sun, 66,000 kms.

My Cars:
1975 Duster, 360ci
1977 Cordoba, 400ci
1968 Monacco 500, 383ci
1976 Dodge Arrow 1.6L (my rally car)
1981 Trans Am 301ci (second project, sorry guys)
1991 Nissan Stanza (daily driver)
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  #8  
Old 12-25-2001, 05:06 PM
jelsr jelsr is offline
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Sanborn-Glad to see someone besides me goes back that far. Personally I didn't care for the adj. tappets for the flathead, not much room there. Grinding the stems was just about as fast and there were no adjusters to come loose.
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  #9  
Old 12-26-2001, 12:10 AM
sanborn sanborn is offline
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Jelsr, Yes I go back that far but really I've never left. Just today may son and I rolled a 40 Ford PU in my shop to finish. We started on it 15 years ago, never finished it, stock cars got in the way when he was 16 and we never had time to get back to it. Engine is a .060" over 50 Ford, Fenton heads, 3- 97s on Fenton intake, Isky cam, aluminum flywheel and a genuine Holt all steel quickchange. I want to build it with parts that were only available in the 50s or 60s. Probably can't do it but I want to try.
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  #10  
Old 12-27-2001, 02:17 PM
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Mopar_Mudder Mopar_Mudder is offline
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Generally from when I run into people that use thoose terms it means they no nothing what so ever about building motors. And have no idea what is in the motor. It did use to mean something yes, now it is a sign of ignorance and stay clear.

They are the same people that like to say "It has a CAM in it", well all motors have cams in them dim wit, they mean it has and aftermarket cam, but they have no clue as to what.
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  #11  
Old 12-27-2001, 08:39 PM
6pakman 6pakman is offline
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thats excellent mopar mudder!! you hit the nail right on the head!!! (LOL) good choice of words.
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  #12  
Old 12-28-2001, 12:30 AM
richrmixture richrmixture is offline
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sanborn--My 57 Dodge 2-door post came out at about 3600 pounds and its 325 Hemi was 315 horses (not to mention the D-500 354 chrysler motors in some of them). If I am not too far off, isnt that about the same as an E-body with a 383?
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