3/4 race cam

i think it was for the 3/4 of people who had them that dont know what cam specs are.

Isky and McGurk both used this terminology back in the old days

Same nonsense as stage whatever

stuart in mn wrote: There was a lot of double talk back in the day. Iskendarian had their '5 cycle' cam (What's better than a four cycle engine? A five cycle engine, of course.)

So...that 5th cycle would be detonation???

So with these 3/4 Race cams, which two cylinders* are still on the stock cam?

*We are talking about bent 8s, right?

you guys made me use the googles. http://www.enginelabs.com/engine-tech/cam-valvetrain/tech-quickie-what-is-a-34-race-camshaft/

Jensenman said: The explanation I always heard was: stock, 1/2 race, 3/4 race and full race cams. The more lift/duration/overlap, the closer to 'full race' it was. At my dad's speed shop, we kept an old Chevy cam with 4 lobes cut off, when someone came in wanting a '3/4 cam' we'd plop that bad boy on the counter. The funniest part was some people would actually reach for their wallets...

Remembering Curmudgeon...

https://grassrootsmotorsports.com/forum/grm/what-is-a-34-racing-cam/56401/page1/

I don't have anything other than my lumpy sounding chev pickup with two bad cylinders. I told everyone it was full race but tried not to have to prove it or the jig was up.

Opti wrote: In reply to The_Jed: AFAIK RV cam is just the stock LT1 cam

The way I've heard it used refers to any slightly bigger than stock cam concentrating on bottom end power, all in on torque around 2000 and good with a stock torque converter kind of deal. As one would want in a heavier truck or RV.

Jaguar once had a 3/8" cam or cams.

BrokenYugo wrote:

Opti wrote: In reply to The_Jed: AFAIK RV cam is just the stock LT1 cam

The way I've heard it used refers to any slightly bigger than stock cam concentrating on bottom end power, all in on torque around 2000 and good with a stock torque converter kind of deal. As one would want in a heavier truck or RV.

Exactly. Usually, a good one turns out to be the "why didn't they use this from the factory?" cam.

In reply to Nick (LUCAS) Comstock:

"I put a 3/4 race cam in an RX7 in 1983. It would run in the nines on street tires. True story."

A race cam in a rotary engined car? Where did you put it - in the trunk?

How I know I'm getting old:

Student: I'm thinking of going with a stage 2 suspension.
Me: That means nothing.
Student: ?
Me: Stage means nothing, you have to know what the parts are so you can stay within the rules.
Student: ?
Me: Go home and read the rule book.
Student: ?
Me: Online, find the rules online before you spend money.

David S. Wallens wrote: Other than the back-and-forth between me and JG, you just don't hear that term as much as you used to.

It's been replaced by rice crowd with 'forged internals'

Zomby Woof wrote:

David S. Wallens wrote: Other than the back-and-forth between me and JG, you just don't hear that term as much as you used to.

It's been replaced by rice crowd with 'forged internals'

And they probably think it means a Graddy turbo and Eagal rods with Wizeco pistons, found them on eBay for $200 shipped direct.

I'm thinking that with all the 3/4 race cams out there all we need to do is gather up all the 1/4 remainders, bundle 4 of them together and sell them as 4/4 race cams.

wspohn wrote: In reply to Nick (LUCAS) Comstock: "I put a 3/4 race cam in an RX7 in 1983. It would run in the nines on street tires. True story." A race cam in a rotary engined car? Where did you put it - in the trunk?

I forget to mention the knife edged connecting rods

Nick (LUCAS) Comstock wrote:

wspohn wrote: In reply to Nick (LUCAS) Comstock: "I put a 3/4 race cam in an RX7 in 1983. It would run in the nines on street tires. True story." A race cam in a rotary engined car? Where did you put it - in the trunk?

I forget to mention the knife edged connecting rods

Crossdrilled valves and fully port and polished rocker arms.

True story..

Back in the day, hearing an engine with a lopy cam was a lot more common. Myself and others would just say 'yeah, its got a cam in it' or something to that effect.

So one day a friend of my cousin stops by in a boxy Malibu with a 'Corvette' engine. The poor car was tickin' like mad. I sayz to the kid, 'get you some chrome valve covers and I'll swap 'em in and adjust the lifters while I'm at it'.

The kid takes off and a short while latter he returns with some plain Jane chrome valve covers.

So true to my word I go ahead and swap in the valve covers and adjust the valves. As luck would have it, one lifter just wouldn't take an adjustment. Upon closer inspection it appeared the rocker wasn't moving very much. I turned to the kid and said 'looks like your cam is shot' ..... What happens next was totally unexpected....

Having heard the cam was shot, the kids face lit up with a huge smile. The reaction confused me to a point where I asked why does this make you happy?

Kid says.... its got a cam in it!

Apparently he didn't know that all engines have cams...

Opti wrote: In reply to The_Jed: AFAIK RV cam is just the stock LT1 cam

Wait...I can put a small block cam in my 22RE? Who knew?

Doc Brown wrote: Apparently he didn't know that all engines have cams...

Well, not the good ones, anyway,

That said, a guy I worked with used to say "Oh it's got a CAM in it!" whenever any ailing, poorly running POS came into the shop. Because really, what makes a hot cammed engine sound like it does is the fact that it fails at running well.

So that made it into my lexicon. A few years later, I'm working where I am now, and I stopped using that phrase after my co-worker generally responded with "I hope it has a cam in it, it's running!"

Oh well.

An aside, I think the market is ripe for custom code for standalones that drops random injector pulses in a semi-syncopated way, with the percentage going up as vacuum goes up and RPM goes down. We'll call it the "hot cam effect table". Most of the people who want a performance build never actually DRIVE their cars hard, they just want it to sound mean when they cackle in to the cruise ins, so I figure this would give them what they want and they won't be in every two weeks because the plugs are fouled or something.

In reply to Knurled:

That's actually a REALLY good idea. Call it "The Loper", make millions.

I have a 3/4 Race Cam in my Corvair.

Knurled wrote: An aside, I think the market is ripe for custom code for standalones that drops random injector pulses in a semi-syncopated way, with the percentage going up as vacuum goes up and RPM goes down. We'll call it the "hot cam effect table". Most of the people who want a performance build never actually DRIVE their cars hard, they just want it to sound mean when they cackle in to the cruise ins, so I figure this would give them what they want and they won't be in every two weeks because the plugs are fouled or something.

Its really easy: retard the timing a bit and lower the idle rpm target. Not that I have done this for people. Modern cam designs are just too good.

I bought one of THESE for the wife's Sunfire, which pumps V8 lope through the FM radio. The kids love it!

3/4 cam...........amateurs!!! My Datsun has a wazoo 13/16ths cam in it.

The engine in my F500 is an ultra trick 6 valves per cylinder.

Tom