comp xe285hl camshaft
#1757807
02/18/15 02:36 PM
02/18/15 02:36 PM
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Joined: May 2009
Posts: 65
colorado
cocamcuda
OP
member
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OP
member
Joined: May 2009
Posts: 65
colorado
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is anyone running this cam in there 440 ???? good,bad, results ???? the duration is bugging me,241 @50. my 284-484 mopar purple shaft has the same duration.been told in order to increase cylinder pressure I need less duration.??? doing a head and cam swap and want to get it right.thanks jim
Last edited by cocamcuda; 02/18/15 11:20 PM.
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Re: comp xe275hl camshaft
[Re: cocamcuda]
#1757808
02/18/15 02:55 PM
02/18/15 02:55 PM
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Joined: Jun 2006
Posts: 5,173
CT
GTX MATT
master
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master
Joined: Jun 2006
Posts: 5,173
CT
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What else ya got? Compression, intake, headers/manifolds, heads/headflow, converter, gears, carb
Now I need to pin those needles, got to feel that heat
Hear my motor screamin while I'm tearin up the street
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Re: comp xe275hl camshaft
[Re: GTX MATT]
#1757809
02/18/15 03:14 PM
02/18/15 03:14 PM
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Joined: May 2009
Posts: 65
colorado
cocamcuda
OP
member
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OP
member
Joined: May 2009
Posts: 65
colorado
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we are installing edelbrock 84cc rpm heads.10.5-1 comp ratio,2 inch primary tube headers,3.73 gears,727trans w/a&a low gear set,manual valve body, jw-3200 stall ,edelbrock dual plane perf rpm intake.holley 830-dp,harland sharp 1.6 rockers,we are going to mill the heads a bit to increase the compression to 11-1.car is a 70 cuda,3800 lbs,driven @5280 ft above sea level.denver area.thanks jim  javascript:void(0)
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Re: comp xe275hl camshaft
[Re: cocamcuda]
#1757810
02/18/15 03:42 PM
02/18/15 03:42 PM
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Joined: Aug 2003
Posts: 43,719
Bend,OR USA
Cab_Burge
I Win
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I Win
Joined: Aug 2003
Posts: 43,719
Bend,OR USA
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You may have looked at the XE285HL specs. for the duration at .050, the XE275HL has 231 @ .050 intake and 237 @ .050 on the exhaust. I have several different motors with all three grinds of Comps XE---HL in them, I put the one you have in a 464 C.I. 440, 3.91 stroke with 4.35 bore with a similar top end like yours. The motor made a little over 500 HP and simialr torque on the local Studka engine dyno at 2500 Ft elevation on Oregon 91 octane non ethanol pump swill  This motor doesn't have as much compression as yours does so keep that in mind, I ran it with two different Holley 850 DP also, they don't have annular boosters like the 830 D.P. have and both carbs. where showing rich(11.3to 11.8) on the AFR on the dyno. I'll finish the tune up once the motor is in the customers car with his exhaust system on it  BTW, I hate Mopar brand camshafts, you may love that Comp XE275HL   Did you degree it in? If so what intake lobe center did you install it at? At your altitude I would probally go to 104 to 107 on the intake lobe centers
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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Re: comp xe275hl camshaft
[Re: cocamcuda]
#1757811
02/18/15 03:54 PM
02/18/15 03:54 PM
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Joined: Feb 2015
Posts: 2,117
CA
crackedback
top fuel
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top fuel
Joined: Feb 2015
Posts: 2,117
CA
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Quote:
is anyone running this cam in there 440 ???? good,bad, results ???? the duration is bugging me,241 @50. my 284-484 mopar purple shaft has the same duration.been told in order to increase cylinder pressure I need less duration.??? doing a head and cam swap and want to get it right.thanks jim
Wind the cam ahead to a 100 ICL and you'll get some cyl pressure.
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Re: comp xe285hl camshaft
[Re: cocamcuda]
#1757812
02/19/15 12:07 AM
02/19/15 12:07 AM
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Joined: Oct 2011
Posts: 559
Idaho
LaRoy Engines
mopar
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mopar
Joined: Oct 2011
Posts: 559
Idaho
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440 +.030", XE285HL 241/247 @ .050, .581/.581 lift w/1.6 rockers, 106 ICL, running solid lifters w/.006" hot lash. 8.9:1 compression, ported 346 iron heads.
522 lb-ft
540 hp @ 5,500rpm
476 lb-ft @ 3,500rpm.
Same engine with ported EZ heads, 10.3:1 compression,
543 lb-ft
595 hp @ 6,400rpm
500 lb-ft @ 3,500rpm and 488 lb-ft @ 6400.
Last edited by LaRoy Engines; 02/19/15 12:08 AM.
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Re: comp xe285hl camshaft
[Re: LaRoy Engines]
#1757813
02/19/15 12:32 AM
02/19/15 12:32 AM
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Joined: Feb 2005
Posts: 4,333
Prospect, PA
BSB67
master
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master
Joined: Feb 2005
Posts: 4,333
Prospect, PA
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Quote:
440 +.030", XE285HL 241/247 @ .050, .581/.581 lift w/1.6 rockers, 106 ICL, running solid lifters w/.006" hot lash. 8.9:1 compression, ported 346 iron heads.
522 lb-ft
540 hp @ 5,500rpm
476 lb-ft @ 3,500rpm.
Same engine with ported EZ heads, 10.3:1 compression,
543 lb-ft
595 hp @ 6,400rpm
500 lb-ft @ 3,500rpm and 488 lb-ft @ 6400.
Do you have comparative results with hydraulic lifters?
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Re: comp xe275hl camshaft
[Re: lewtot184]
#1757816
02/20/15 03:14 AM
02/20/15 03:14 AM
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Joined: Nov 2008
Posts: 660
San Diego
formula S
mopar
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mopar
Joined: Nov 2008
Posts: 660
San Diego
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Quote:
the mopar 284-.484 hydraulic is [Email]237@.050[/Email], [Email]146@.200.[/Email]
The mopar purpleshaft cam is actually 241@.050 part # P4120235AE
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Re: comp xe275hl camshaft
[Re: formula S]
#1757817
02/20/15 11:54 AM
02/20/15 11:54 AM
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Joined: Jun 2008
Posts: 3,916
usa
lewtot184
master
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master
Joined: Jun 2008
Posts: 3,916
usa
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Quote:
Quote:
the mopar 284-.484 hydraulic is [Email]237@.050[/Email], [Email]146@.200.[/Email]
The mopar purpleshaft cam is actually [Email]241@.050[/Email] part # P4120235AE
nope. i've measured them.
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Re: comp xe275hl camshaft
[Re: Cab_Burge]
#1757819
02/20/15 07:02 PM
02/20/15 07:02 PM
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Joined: Jun 2008
Posts: 3,916
usa
lewtot184
master
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master
Joined: Jun 2008
Posts: 3,916
usa
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Quote:
Quote:
Quote:
Quote:
the mopar 284-.484 hydraulic is [Email]237@.050[/Email], [Email]146@.200.[/Email]
The mopar purpleshaft cam is actually [Email]241@.050[/Email] part # P4120235AE
nope. i've measured them.
Another reason I don't like or use them dang Mopar Purple shaft cams, no consistency between the vendors Mopar uses when they shift to the next cheaper cam grinder Lack of quality control has been the demise of many products and companys  
cab, of the few mopar cams i've measured i've not noticed an inconsistency. the problem is in the past few years mopar started using a different formula to rate their hydraulic cams that is inaccurate leading to inflated numbers. 284/.484 i measured was 286/.486-108lsa, identical to a racer brown ssh25. i think some of those purple cams are just racer brown clones. surely you remember back when mopar didn't make any cams; they just put a part number on somebody else's. i think when the old racer browm folded up they just repackaged some of those grinds.
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Re: comp xe285hl camshaft
[Re: BSB67]
#1757820
02/20/15 08:26 PM
02/20/15 08:26 PM
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Joined: Oct 2011
Posts: 559
Idaho
LaRoy Engines
mopar
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mopar
Joined: Oct 2011
Posts: 559
Idaho
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Quote:
Quote:
440 +.030", XE285HL 241/247 @ .050, .581/.581 lift w/1.6 rockers, 106 ICL, running solid lifters w/.006" hot lash. 8.9:1 compression, ported 346 iron heads.
522 lb-ft
540 hp @ 5,500rpm
476 lb-ft @ 3,500rpm.
Same engine with ported EZ heads, 10.3:1 compression,
543 lb-ft
595 hp @ 6,400rpm
500 lb-ft @ 3,500rpm and 488 lb-ft @ 6400.
Do you have comparative results with hydraulic lifters?
Yes and no. I changed lifters primarily to extend the rpm range, which it did. Unfortunately at the same time I changed the exhaust valve diameter which would render the results meaningless.
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Re: comp xe275hl camshaft
[Re: lewtot184]
#1757821
02/22/15 04:31 PM
02/22/15 04:31 PM
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Joined: Nov 2008
Posts: 660
San Diego
formula S
mopar
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mopar
Joined: Nov 2008
Posts: 660
San Diego
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Quote:
Quote:
Quote:
the mopar 284-.484 hydraulic is [Email]237@.050[/Email], [Email]146@.200.[/Email]
The mopar purpleshaft cam is actually [Email]241@.050[/Email] part # P4120235AE
nope. I've measured them.
 Yep, I've cam doctored a big block and a small block 284 484 cams and they both came in at 241 @.050 perhaps you had the 280 474 cam because those cams come in at 237 @.050 as I have checked those also, re calibrate and check again
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Re: comp xe275hl camshaft
[Re: skrews]
#1757824
02/23/15 10:55 PM
02/23/15 10:55 PM
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Joined: Nov 2008
Posts: 660
San Diego
formula S
mopar
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mopar
Joined: Nov 2008
Posts: 660
San Diego
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Quote:
Measured my MP small block 284/484 cam a few years ago
Adv dur @ .006 294 degrees
dur @ .020 266 degrees
dur @ 0.50 238 degrees
dur @ .100 204 degrees
dur @ .200 143 degrees
lobe lift .321"
I remeasured this 3 times, as I was surprised at how far off it was from the rated specs. Seems there is no consistency from one Purple Shaft to the next.
Perhaps a vendor change is the problem, the cams I measured were done 20yrs ago
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Re: comp xe275hl camshaft
[Re: formula S]
#1757825
02/24/15 05:00 AM
02/24/15 05:00 AM
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Joined: Jul 2012
Posts: 430
Washington
skrews
mopar
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mopar
Joined: Jul 2012
Posts: 430
Washington
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Quote:
Quote:
Measured my MP small block 284/484 cam a few years ago
Adv dur @ .006 294 degrees
dur @ .020 266 degrees
dur @ 0.50 238 degrees
dur @ .100 204 degrees
dur @ .200 143 degrees
lobe lift .321"
I remeasured this 3 times, as I was surprised at how far off it was from the rated specs. Seems there is no consistency from one Purple Shaft to the next.
Perhaps a vendor change is the problem, the cams I measured were done 20yrs ago
Thats what I'm thinking. The cam I measured was bought around 2003. The other day I was looking at a Purple shaft that was made in the late80s or early 90s, its definitely not ground by the same manufacturer as mine.
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