What's the exhaust duration, and LSA?
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Last edited by slammedR/T; 06-22-2017 at 09:56 PM. Reason: too many tears.....
11.27 @ 118.232017 NM Mopar Challenge Series Champion
I take it the .540 lift is with a 1.6 rocker or?
.540 with a 1.5 rocker
242 duration on a 114.
1998 Silver RC SLT - Hughes 2.02 Heads, Mopar M1 4bbl Intake, Mopar 4bbl TB, 230/236 .515/.515 on a 110, 1.6 Roller Rockers, 4.10's, Spintech Headers, 3" Duals, X Pipe, Chambered Mufflers, 4/4 Drop, 727 Full Manual w/Transbrake, PTC 4500 Stall
12.90 at 104mph
This is a single pattern grind so intake and exhaust duration is the same. It has 14* of overlap with a long duration. Lobes look kind of round depicting that. This is a cam that would make gobs of mid range torque with excellent idle characteristics.
The advertised/rated duration of that cam should be about 294 294(2) = 588 588/4 = 147 147-114 = 33 33(2) = 66-degrees of overlap.
This cam will build power toward and into the upper rpm range and have a very noticeable to a rough idle, especially in a smaller cubic inch engine, even though it is on a 114 lsa. The power range in a naturally aspirated 360 engine will be around 2600-6600+
Although not the same specs and not a Chrysler this cam is in the same ballpark as far as the intake duration and LSA goes: https://www.youtube.com/watch?v=y90g1BzGmBw
I saw the specs on this cam from the op making an earlier post some time ago. As the cam was described, with the degree of intake opening and the exhaust closing, it added to 14* overlap but I did it at .050 so it is not coming out right. I guess it depends on preferences as to what an "excellent" idle is. Mid power to me is 2500-4500 and this cam should start to come on like "we the people" in this range.
What is the overlap of a cam that is intake opening at 1- and closing at exhaust at 4- . .507 lift with .317 lobe height and 112 lsa? If you call Comp, they'd say "this cam has 5-* overlap". If you figure it out from advertised, (263-274) it has 44* overlap with a "noticeable idle". Being measured at .050 is giving a conflicting number.
Last edited by arro222; 07-24-2017 at 12:44 AM.
Overlap is typically called out with the advertised/rated or seat timing. Comp shows the seat (advertised/rated) timing on the card but the opening and closing figures are called out at .050. Calculating at .050 will not provide the correct overlap values. The seat timing of your cam is: intake opens at 23.5-degrees and the exhaust closes at 20.5-degrees. 23.5 + 20.5 = 44 Or, seat duration for the intake is 263 and seat duration for the exhaust is 273. 263 + 273 = 536 536/4 = 134 134 - 112 = 22 22(2) = 44What is the overlap of a cam that is intake opening at 1- and closing at exhaust at 4- . .507 lift with .317 lobe height and 112 lsa? If you call Comp, they'd say "this cam has 5-* overlap". If you figure it out from advertised, (263-274) it has 44* overlap with a "noticeable idle". Being measured at .050 is giving a conflicting number.
Duration at .050 is a more uniform method of comparing camshafts from different manufacturers since one manufacturer may calculate the advertised duration at .006 lift and another at say .004 lift. Also, within the same camshaft manufacturer, you can have two different profiles with the same advertised intake duration of 290, while the intake duration at .050 is quite different from one profile to the other. One profile will call out the intake duration of 230 at .050 while the other profile has a 236 duration at .050, again, both with the same advertised intake duration of 290. The cam card at .050 will show this difference.Apparently. Makes me wonder why they bother to split it this way instead of giving degrees @.006.
The cam I'll be using in my hot 408 has these specs (see cam card). Should have decent street manners
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