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Invalid User Name
02-15-2010, 11:25 AM
This car looks like a good beginning for someone, but there is something fishy about the ad.

http://tampa.craigslist.org/hil/cto/1599740200.html

Doug
Venice, Florida
1950 Champion
9G F1
http://i100.photobucket.com/albums/m15/w4jdz/Stu-1.jpg

Chris Pile
02-15-2010, 11:32 AM
I think the overbore would probably mean that internal combustion would go external - which is usually not a good thing.

Chris Pile
http://midwaystudebakers.tripod.com/

Milaca
02-15-2010, 12:09 PM
I guess describing that the engine is bored 30,000 looks more impressive than the engine having been bored .030"? [8D]

http://farm3.static.flickr.com/2603/4186458840_06e63fc9bc_m.jpg
Flo (she loves Studes because they are progressive)
In the middle of Minnestudea

M15 Trucker
02-15-2010, 05:24 PM
It sounds like the owner doesn't know anything about engines and that whoever he purchased it from, told him the engine was bored out "over bored 30 thousands" (of an inch) and has a 3/4 cam. Just repeating what he heard.

M15 Trucker
02-15-2010, 05:24 PM
It sounds like the owner doesn't know anything about engines and that whoever he purchased it from, told him the engine was bored out "over bored 30 thousands" (of an inch) and has a 3/4 cam. Just repeating what he heard.

M15 Trucker
02-15-2010, 05:25 PM
It sounds like the owner doesn't know anything about engines and that whoever he purchased it from, told him the engine was bored out "over bored 30 thousands" (of an inch) and has a 3/4 cam. Just repeating what he heard.

Johnnywiffer
02-15-2010, 05:59 PM
Didja have a hard time makin' that last post go thru? [:o)]

John

bams50
02-15-2010, 06:04 PM
I've always wondered what people mean by "3/4 cam". Wouldn't that mean .750 lift?:)

Robert (Bob) Andrews- on the IoMT (Island of Misfit Toys)
Parish, central NY 13131
http://www.patrioticon.org/images/flag1-1.gif
GOD BLESS AMERICA

RareBird
02-15-2010, 06:39 PM
3/4 worn????

http://i657.photobucket.com/albums/uu300/PackHawkDaddy/P6230004.jpg

Packardbakerly,
J.D.

hawknose1
02-15-2010, 07:00 PM
hey j.d. got a engle cam in that packard hawk?

John C.Stroud

okc63avanti
02-15-2010, 07:19 PM
I think 3/4 cam is a reference to the duration of lift. 3/4 duration is a 270 deg duration cam. 270 deg is 3/4 of 360 degrees which is a full circle. Someone who is a gearhead correct me please if I am wrong on this.

John

http://i429.photobucket.com/albums/qq16/okc63avanti/Profile/AvantionLift.jpghttp://i429.photobucket.com/albums/qq16/okc63avanti/Profile/jgheads_pandp.jpghttp://i429.photobucket.com/albums/qq16/okc63avanti/Profile/NewPistons.jpghttp://i429.photobucket.com/albums/qq16/okc63avanti/Profile/Headson.jpg
63R-2386 under restoration & modification

Dick Steinkamp
02-15-2010, 07:22 PM
quote:Originally posted by okc63avanti

I think 3/4 cam is a reference to the duration of lift. 3/4 duration is a 270 deg duration cam. 270 deg is 3/4 of 360 degrees which is a full circle. Someone who is a gearhead correct me please if I am wrong on this.




Back "in the day", there were 3/4 race cams and full race cams. I don't think the full race cam had 360 degrees of duration. ;) I think they were just rather subjective descriptions of how much they "hopped up" an engine.

Dick Steinkamp
Bellingham, WA
http://i706.photobucket.com/albums/ww63/dstnkmp/1963%20Avanti/pics005-1.jpg

Chantony
02-24-2010, 10:18 AM
True! A 3/4 race cam was fairly wild compared to a 1/2 race.This was common terminology in the seventies.People were more impressed if you said you had a 3/4 cam rather than a 1/2 race cam.The 3/4 was quite lumpy and a friend had a Holden with a 3/4 race Chev motor and the car would literally rock at idle and was painful until it got speed up.Used to get 6 mpg. which is about 5mpg U.S. I think.

A.C.Moisley

52-fan
02-24-2010, 10:25 AM
I think by the 70s that term was dying out here. It was a way to tell someone that you had a modified cam, but it wasn't a race only piece. I remember J.C.Whitney advertising Studebaker cams that way. Stock grind,3/4 race, Full race. I don't remember a 1/2 race.

http://i152.photobucket.com/albums/s186/52-fan/StudebakersofArkansas2-1.jpg"In the heart of Arkansas."
1952 Champion Starlight w/overdrive. Searcy, Arkansas

Skip Lackie
02-24-2010, 11:10 AM
I agree. The 3/4 race term was more of a 1940s-60s descriptor, in the US at least. And I agree with Dick that it was more subjective and descriptive than quantitative. A full-race cam was way too lumpy to be driven on the street, but a 3/4 race sounded bad enough to impress bystanders.

Skip Lackie
Washington DC

Mike
02-24-2010, 12:20 PM
In the '60's, terms used to indicate "state of tune" of an engine were 3/4, full race, and track.
A 3/4 cam was just a hot street cam; comparable to maybe an "R" series cam ,or a Chevy Duntov. A full race cam was hotter. You could expect a rougher idle and less gas mileage; but I ran them on the street with no serious problems. Hotter still were the "Track" grinds. Friends who drag raced their cars ran these; and drove the cars on the street.
Mike M.

starliner62
02-24-2010, 02:20 PM
I thought that the last quarter of the cam fell off!!![:I]

Jamie McLeod
Hope Mills, NC