What makes a cam "lope?"
12-31-2004, 11:37 AM
#22
Originally Posted by SportSide 5.3
Dang, and all that time I thought a cam had to be on a 114lsa or wider to idle well. 
Last edited by black_knight; 12-31-2004 at 11:42 AM.
12-31-2004, 11:50 AM
#23
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It causes a lot of intake reversion which causes the engine to basically choke on it's own exhaust during idle.
ok, im done having fun
12-31-2004, 02:53 PM
#26
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Originally Posted by rodent
My cam is 224/222 568/566 114
It came out to be -9
Will my idle be like stock?
It came out to be -9
Will my idle be like stock?
overlap Year Lift Duration LSA Timing
LS1
-31 97-99 .479/.472 207/199 117 113/121
-27.5 2000 .500/.500 209/198 115.5 112/119
-30.5 01-03 .479/.467 207/196 116 117/115
---------------------------------------
LS6
-24.5 2001 .535/.525 211/204 116 114/118
-24 02-03 .551/.555 218/204 117.5 115/120
So -4 (TR224) cam and your cam will still be much choppier than stock.
12-31-2004, 11:25 PM
#29
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overlap Year Lift Duration LSA Timing
LS1
-31 97-99 .479/.472 207/199 117 113/121
-27.5 2000 .500/.500 209/198 115.5 112/119
-30.5 01-03 .479/.467 207/196 116 117/115
---------------------------------------
LS6
-24.5 2001 .535/.525 211/204 116 114/118
-24 02-03 .551/.555 218/204 117.5 115/120
LS1
-31 97-99 .479/.472 207/199 117 113/121
-27.5 2000 .500/.500 209/198 115.5 112/119
-30.5 01-03 .479/.467 207/196 116 117/115
---------------------------------------
LS6
-24.5 2001 .535/.525 211/204 116 114/118
-24 02-03 .551/.555 218/204 117.5 115/120
Those durations are listed backwards compared to what is usually seen. I'd just like to clarify this for anyone who might scroll upon this and think all of these are reverse split camshafts. So for example. Cam 1 (97-99) would more commonly be seen as: 199/207 .472/.479 on a 117lsa.
01-01-2005, 12:20 AM
#30
Originally Posted by SportSide 5.3
Those durations are listed backwards compared to what is usually seen. I'd just like to clarify this for anyone who might scroll upon this and think all of these are reverse split camshafts. So for example. Cam 1 (97-99) would more commonly be seen as: 199/207 .472/.479 on a 117lsa.
you can see the stock cam spec's off a cam doctor in the FAQ in my sig.
01-01-2005, 12:08 PM
#31
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Al right, just so everyone does not think I am an idiot.
I did not actually look up this info I just got the specs off an other guy on the Internet.
The way they are listed is a bit confusing since that not the way most people list cam specs. The way they are shown all these cams look like reverse split cams. They are not. All the intake and exhaust specs are backwards and on top of that they are all the specs for the y-body’s not the f-body cars.
Here is a more accurate table and less confusing.
overlap Year Lift Duration LSA
LS1 Y-Body’s (Corvettes)
-31 97-99 .472/.479 199/209 117
-27.5 2000 .500/.500 198/209 115.5
-30.5 01-03 .467/.479 196/207 116
---------------------------------------
LS6 Y-Body’s (Corvettes)
-24.5 2001 .525/.525 204/211 116
-24 02-03 .555/.551 204/218 117.5
---------------------------------------
LS1 F-Body’s (Camaro, Firebird)
-35.5 98-00 .500/.500 198/209 119.5
-30.5 01-02 .467/.479 196/207 116
I did not actually look up this info I just got the specs off an other guy on the Internet.
The way they are listed is a bit confusing since that not the way most people list cam specs. The way they are shown all these cams look like reverse split cams. They are not. All the intake and exhaust specs are backwards and on top of that they are all the specs for the y-body’s not the f-body cars.
Here is a more accurate table and less confusing.
overlap Year Lift Duration LSA
LS1 Y-Body’s (Corvettes)
-31 97-99 .472/.479 199/209 117
-27.5 2000 .500/.500 198/209 115.5
-30.5 01-03 .467/.479 196/207 116
---------------------------------------
LS6 Y-Body’s (Corvettes)
-24.5 2001 .525/.525 204/211 116
-24 02-03 .555/.551 204/218 117.5
---------------------------------------
LS1 F-Body’s (Camaro, Firebird)
-35.5 98-00 .500/.500 198/209 119.5
-30.5 01-02 .467/.479 196/207 116
01-01-2005, 11:34 PM
#32
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what degrees overlap do you haveta have to sound close to stcok like be almost un noticeable even to myslef...MTI Stealths SS1 and SS@ are both -10° and the OLD MAN CAM is -13° but i dont kno how close to stock those sound....since stock is -30°^
whats the highest you can go to sound like jsut a full bolton car? i want the ultimate power on the ultimate sleeper for the time being and this info will help
whats the highest you can go to sound like jsut a full bolton car? i want the ultimate power on the ultimate sleeper for the time being and this info will help
01-02-2005, 07:49 PM
#37
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I would tend to think so. Here, let me dig up a link.
After the combustion stroke there is tremendous pressure in the cylinder. As soon as the exhaust valve cracks open it flows a LOT of air. It's basically boosted out of the cylinder if you want to look at it like this. Having the exhaust valve open too early not only costs heat (power) & velocity through the exhaust runners, it also empties the cylinder before the intake valve is open enough to take advantage of the pressure differential. (in a limited overlap/smogable camshaft this is especially true) This causes exhaust reversion & is one of the key factors in surging problems. By the airflow reversing course it is loosing a lot of it's inertia. Typically this is overcome before peak torque however. So only low-speed issues are present. At the track these motors are always above 4500rpm so this does not affect track times too much. Stilll....there is significant power lost by allowing reversion. So it makes sense to open the exhaust valve a little later & increase the overlap a bit. By adding advance into the camshaft this makes the problem even worse as now you're opening the exhaust a few more degrees earlier.....& shortening the effectiveness of the intake unless you have significant overlap flow to over come this.
Simply put, advancing a cam makes it more exhaust bias relative to TDC. Retarding a cam makes it more intake bias relative to TDC.
Simply put, advancing a cam makes it more exhaust bias relative to TDC. Retarding a cam makes it more intake bias relative to TDC.
01-02-2005, 11:33 PM
#38
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Originally Posted by JBGRAYTA
And where can you get a freakin' cam that has less than .600 lift that can "whump whump" like a larger cam?
Originally Posted by JBGRAYTA
I don't know how some of you can run these gigantic cams, especially in an auto. I knew I should've gotten a 6 speed! damn!
Just gotta get a new converter with a good tune and you're set. 
01-03-2005, 04:25 AM
#40
11 Second Club
Originally Posted by ZMC_Racing
yea but u cant run them with something like a 3000 stall, has to be gigantic to match the cam.