Pick a cam for the Imperial
#2030415
03/13/16 07:08 PM
03/13/16 07:08 PM
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Joined: Jan 2003
Posts: 28,063 Irving, TX
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Senior Management
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Irving, TX
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The big Imp is going to need a new cam. Which one fits the bill the best?
440 Advertised 8.2:1 compression. Real world says 7.8 is more realistic. Edelbrock heads Stock intake 650 AFB carb Stock manifolds Dual 2-1/4" exhaust 727 Stock large converter Power brakes 3.23 gear 29" tires 5100+ lbs
This car is a big lumbering highway cruiser. It needs power between 2200 and 4500 rpm. The recently deceased cam was a Comp 21-000-5 single pattern cam. 261 degrees (218 @ .050) and .463 lift with 114 degrees of separation.
It might have been a slight improvement over stock but it was still a gutless pig.
We are brothers and sisters doing time on the planet for better or worse. I'll take the better, if you don't mind. - Stu Harmon
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Re: Pick a cam for the Imperial
[Re: 19swinger70]
#2030434
03/13/16 07:32 PM
03/13/16 07:32 PM
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Nice until this one little bit: Your vacuum should be in the 9"-11" range using this cam. That does not sound friendly to power brakes and vacuum actuated AC.
We are brothers and sisters doing time on the planet for better or worse. I'll take the better, if you don't mind. - Stu Harmon
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Re: Pick a cam for the Imperial
[Re: feets]
#2030447
03/13/16 07:40 PM
03/13/16 07:40 PM
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Joined: Jan 2011
Posts: 4,785 Utah and Alaska
astjp2
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I would do a 112 lsa to keep the vacuum up, 230-240@.050 and a .560-.600 lift The wider LSA will also help with dynamic compression. Chase Knight spec'd my Hemi cam, I was looking for similar performance. Tim
1941 Taylorcraft 1968 Charger 1994 Wrangler 1998 Wrangler 2008 Kia Rio 2017 Jetta
I didn't do 4 years and 9 months of Graduate School to be called Mister!
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Re: Pick a cam for the Imperial
[Re: feets]
#2030476
03/13/16 08:23 PM
03/13/16 08:23 PM
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Joined: Jun 2008
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lewtot184
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Re: Pick a cam for the Imperial
[Re: feets]
#2030491
03/13/16 08:50 PM
03/13/16 08:50 PM
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Joined: Aug 2005
Posts: 4,861 Riverside, Ca
R70RUNNER
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The converter, compression, gears, and weight all work against you and that "gutless pig" feel. I'd suggest contacting a few converter companies PTC, Continental, Coan.. Ect and work closely with a them and a cam grinder as a team to liven he car up. I'd also suggest you strongly consider moving lower (numerically higher) gears. 3.73 would be a fair compromise. Your best hope at a satisfactory result will come from using torque multiplication in your favor rather than seeking a camshaft alone as the fix. There's no point in suggesting a cam because the 218@.050 wasn't a bad choice build a package
Current cars: 2000 Dak Quad Cab, 2012 Challenger,1970 Road Runner, 1994 Firehawk
1966 Coronet post sedan, 1988 Corvette, 2005 Magnum RT all SOLD
R70RUNNER<---VP Inland Empire Chapter of the MPM
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Re: Pick a cam for the Imperial
[Re: feets]
#2030543
03/13/16 10:01 PM
03/13/16 10:01 PM
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Joined: Jan 2011
Posts: 4,785 Utah and Alaska
astjp2
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No to headers, I would also look to doing a stroker crank, if you are going through the headache of a cam, why not a crank too? Tim
1941 Taylorcraft 1968 Charger 1994 Wrangler 1998 Wrangler 2008 Kia Rio 2017 Jetta
I didn't do 4 years and 9 months of Graduate School to be called Mister!
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Re: Pick a cam for the Imperial
[Re: feets]
#2030555
03/13/16 10:14 PM
03/13/16 10:14 PM
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Posts: 28,063 Irving, TX
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No to the stroker. If I want big power I'll slide the turbos under the hood. This car is supposed to be all about trouble free cruising. It would be nice to have a little more power for the enthusiastic moments and getting around traffic.
We are brothers and sisters doing time on the planet for better or worse. I'll take the better, if you don't mind. - Stu Harmon
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Re: Pick a cam for the Imperial
[Re: feets]
#2030565
03/13/16 10:25 PM
03/13/16 10:25 PM
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Joined: Jan 2011
Posts: 4,785 Utah and Alaska
astjp2
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Is this a rebuild or just a cam swap? I would use cam designed for a large truck with big tires...trucks weight upwards of 7~8K and with 35" tires they are dogs, a cam with wide LSA, high lift and short to moderate duration is what I did on my 78 powerwagon. Upping compressions to 9.5-10 to 1 would also help, longest runners on the intake you can get also makes a difference in your cruising experience. I saw someone in Idaho put a long ram intake on their 440 and it ran out of steam at about 4k rpms but was a beast up to that point. None of these options require a turbo or massive changes (except the intake) also a good tune and distributor curve matched to what rpms your engine is built to run. Tim
Last edited by astjp2; 03/13/16 10:38 PM.
1941 Taylorcraft 1968 Charger 1994 Wrangler 1998 Wrangler 2008 Kia Rio 2017 Jetta
I didn't do 4 years and 9 months of Graduate School to be called Mister!
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Re: Pick a cam for the Imperial
[Re: feets]
#2030584
03/13/16 10:39 PM
03/13/16 10:39 PM
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Joined: Jan 2003
Posts: 28,063 Irving, TX
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Just a cam swap, assuming the rest of the bits survived.
I don't recall the piston height but I think they were somewhere around .125" deep.
We are brothers and sisters doing time on the planet for better or worse. I'll take the better, if you don't mind. - Stu Harmon
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Re: Pick a cam for the Imperial
[Re: feets]
#2030630
03/13/16 11:15 PM
03/13/16 11:15 PM
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Joined: Aug 2005
Posts: 4,861 Riverside, Ca
R70RUNNER
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That's why I said "strongly consider" the gears....in my experience 3.23's are not really cruising gears. It's a crap ratio. Too low to cruise to high to be a performance gear. It's a lousy "on the fence ratio."
3.23= 28"@65mph is 2600rpm..3.73 would still be under 3,000rpm.
We want it all with as few concessions as possible...there's limited compression as it is. Frankly if it were mine I'd go smaller than the previous 218 cam, Maybe even sub 210... No bigger than 214@.050. The two smallest voodoo cams might fit the bill for me, how I'd do it...As I said before, OP I wouldn't buy a cam with out speaking to a converter company because IMHO that's where your power is hiding(in the converter). Once I had that info and some guidelines from them id look around and speak with cam companies. You can throw a cam at it and hope for the best.. But I believe that was what was previously done. With the proper multiplication of torque through a better package you should get where your trying to go.
Current cars: 2000 Dak Quad Cab, 2012 Challenger,1970 Road Runner, 1994 Firehawk
1966 Coronet post sedan, 1988 Corvette, 2005 Magnum RT all SOLD
R70RUNNER<---VP Inland Empire Chapter of the MPM
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Re: Pick a cam for the Imperial
[Re: feets]
#2030724
03/14/16 01:42 AM
03/14/16 01:42 AM
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Joined: Jan 2003
Posts: 14,610 Not2farfromNashville, TN
Rug_Trucker
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I Live Here
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Not2farfromNashville, TN
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Aluminum heads and not taking advantage of them? Sell them and do an RV porting job on a set of closed chambered iron models. Maybe even some 516's :stir: 2500 stall would help. My Maxivan with the 360 was running a 2200 cheapy generic converter, Comp 252* RVcam with 3:21's and was a 6000lb shoe box. I ran a 800TQ or a Mopar '86 model Qjet on an Offy Dual Port intake.
Last edited by Rug_Trucker; 03/14/16 01:43 AM.
"The only thing to do for triumph of evil is for good men to do nothing"
"NUNQUAM NON PARATUS!"
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Re: Pick a cam for the Imperial
[Re: feets]
#2030731
03/14/16 01:55 AM
03/14/16 01:55 AM
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Joined: Jan 2003
Posts: 14,610 Not2farfromNashville, TN
Rug_Trucker
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I Live Here
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Grab some C body HP manifolds. Believe it or not the Holley SD would be a great intake! Even with the 650.
"The only thing to do for triumph of evil is for good men to do nothing"
"NUNQUAM NON PARATUS!"
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Re: Pick a cam for the Imperial
[Re: feets]
#2030807
03/14/16 11:15 AM
03/14/16 11:15 AM
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Joined: Jan 2003
Posts: 21,050 Niles , Ohio
therocks
oh wait.but hey.lets see.oh yeah.
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oh wait.but hey.lets see.oh yeah.
Joined: Jan 2003
Posts: 21,050
Niles , Ohio
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I ran Summits small cam in one of my Imps.Had nice manners and even with almost 200K on the speedo had power and good gas mileage at around 15 or so average.Rocky
Chrysler Firepower
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