WTF is a "3/4 race cam"
07-24-2008, 08:26 AM
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WTF is a "3/4 race cam" Ok I go off of Dur. lift. LSA and that ****... Never in my life have I ever seen specs for a 3/4 race cam... Inputs???
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07-24-2008, 08:51 AM
#2
Arn't 3/4 race cams slightly less agressive than what they used to use in nascar cars in the 60's? High lift cams (around 700) are called race cams, so 3/4 race cams have slightly less lope to them.
correct me if im wrong though guys
correct me if im wrong though guys
07-24-2008, 10:41 AM
#6
Lol, you guys aren't old school enough. It was just a reference to cam size back in the day. It's just an old racer term and doesn't mean someone is full of it, they are just into a different racing scene than you are used to.
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07-24-2008, 11:38 AM
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07-24-2008, 12:19 PM
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i thinkn bout gettin a 3/4
07-24-2008, 01:37 PM
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My best guess is a cam that has a lobe 3/4 around the circle visually aka 275 degrees or more @ .050.
It had always been referred to as a 3/4 cam as far as I was concerned. My dad said he had a 3/4 cam in his 327 fuelly motored 59' Vette. He would shift at 8200 rpms and run 11.20's @ 128+.
When asked what exactly made it a 3/4 cam he just said that was what the engine builder put in it.
So my guess would make sense because it must have been a long duration camshaft to have been still making good power that late in the rpm range.
Make sense?
It had always been referred to as a 3/4 cam as far as I was concerned. My dad said he had a 3/4 cam in his 327 fuelly motored 59' Vette. He would shift at 8200 rpms and run 11.20's @ 128+.
When asked what exactly made it a 3/4 cam he just said that was what the engine builder put in it.
So my guess would make sense because it must have been a long duration camshaft to have been still making good power that late in the rpm range.
Make sense?
07-24-2008, 01:48 PM
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My best guess is a cam that has a lobe 3/4 around the circle visually aka 275 degrees or more @ .050.
It had always been referred to as a 3/4 cam as far as I was concerned. My dad said he had a 3/4 cam in his 327 fuelly motored 59' Vette. He would shift at 8200 rpms and run 11.20's @ 128+.
When asked what exactly made it a 3/4 cam he just said that was what the engine builder put in it.
So my guess would make sense because it must have been a long duration camshaft to have been still making good power that late in the rpm range.
Make sense?
It had always been referred to as a 3/4 cam as far as I was concerned. My dad said he had a 3/4 cam in his 327 fuelly motored 59' Vette. He would shift at 8200 rpms and run 11.20's @ 128+.
When asked what exactly made it a 3/4 cam he just said that was what the engine builder put in it.
So my guess would make sense because it must have been a long duration camshaft to have been still making good power that late in the rpm range.
Make sense?
OK this is prolly this best one so far but I still dont get the race part. I'm serious man... I've been building engines for YEARS and I have never used the term or had it used to me by someone who knew what they were doing. I'm not saying people that use the term are dumb by any means... I'm just trying to finger it out!!
07-24-2008, 03:34 PM
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*I forgot to mention my dad raced back in the late 60's at dover ny. SO essentially it is definately an obsolete ancient term builders used (maybe to hide their cam selection from others). Race Cams were new science back then.
I can only assume the person that was referring to 3/4 was an old racer from the 60's or so or was completely obliviously to how things have been rated in the last 20 something years. Or maybe just a hick-know-nothing know-it-all backyard jackass.
I can only assume the person that was referring to 3/4 was an old racer from the 60's or so or was completely obliviously to how things have been rated in the last 20 something years. Or maybe just a hick-know-nothing know-it-all backyard jackass.
07-25-2008, 12:18 PM
#18
my old grandfather use to ask me if I had a 3/4 cam in my old camaro. I was like no I have 230/230 duration xxx/xxx lift with a 110 lsa. And he didnt know what I was talkin about. lol but he was a grew up in the depression. So he was old enough to use that kind of race slang.
He use to tell me that he had a 1940 ford coupe with flat head V8, mallory dual point ignition, carter carb, smithy glasspacks and a 3 speed. he said it would do over 100 mph lol
wish he still had it and left it to me when he died
He use to tell me that he had a 1940 ford coupe with flat head V8, mallory dual point ignition, carter carb, smithy glasspacks and a 3 speed. he said it would do over 100 mph lol
wish he still had it and left it to me when he died
07-25-2008, 03:58 PM
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The only one that even came close to getting this correct was 'gold86vette'..
3/4 cam referred to a performance cam with 270 degrees of advertised duration @.020 valve lift, duration @.050" would be around 230 degrees..
Ther weren't a whole lot of cams to choose from or people that understood duration, so the manufacturer coined them as 3/4 race cams during that era...
3/4 cam referred to a performance cam with 270 degrees of advertised duration @.020 valve lift, duration @.050" would be around 230 degrees..
Ther weren't a whole lot of cams to choose from or people that understood duration, so the manufacturer coined them as 3/4 race cams during that era...