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Pick a cam for the Imperial #2030415
03/13/16 07:08 PM
03/13/16 07:08 PM
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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
Re: Pick a cam for the Imperial [Re: feets] #2030418
03/13/16 07:11 PM
03/13/16 07:11 PM
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Posts: 3,919
Richmond, Indiana
19swinger70 Offline
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These Hughes "whiplash" cams are made for low compression engines with 9.2 comp or less.

http://www.hughesengines.com/Index/produ...mp;partid=30173


1970 340 swinger. sublime
1967 barracuda fastback BB
55 Plymouth Project
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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Irving, TX
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Originally Posted By 19swinger70
These Hughes "whiplash" cams are made for low compression engines with 9.2 comp or less.

http://www.hughesengines.com/Index/produ...mp;partid=30173



Nice until this one little bit:

Quote:
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
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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Utah and Alaska
astjp2 Offline
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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!
Re: Pick a cam for the Imperial [Re: feets] #2030474
03/13/16 08:21 PM
03/13/16 08:21 PM
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GA
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baracus Offline
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Agree on the 112 lsa, too much duration for his intended use.

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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usa
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lewtot184 Offline
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usa
mopar 272-.455

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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Posts: 4,861
Riverside, Ca
R70RUNNER Offline
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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
Re: Pick a cam for the Imperial [Re: R70RUNNER] #2030499
03/13/16 08:59 PM
03/13/16 08:59 PM
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Posts: 21,808
Kirkland, Washington
Pacnorthcuda Offline
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He's already stated its a "highway cruiser"
It would no longer fit that description with 3.73's.

Re: Pick a cam for the Imperial [Re: feets] #2030503
03/13/16 09:08 PM
03/13/16 09:08 PM
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Posts: 2,094
central texas
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krautrock Offline
top fuel
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central texas
a 29" tire??

i would try this cam...

http://www.manciniracing.com/vohydcamkitc7.html

and maybe put some shorty headers on it.

Last edited by krautrock; 03/13/16 09:08 PM.
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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Utah and Alaska
astjp2 Offline
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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!
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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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
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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Utah and Alaska
astjp2 Offline
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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!
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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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
Re: Pick a cam for the Imperial [Re: feets] #2030612
03/13/16 11:00 PM
03/13/16 11:00 PM
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Posts: 4,394
The Pale Blue Dot
Skeptic Offline
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RPM intake + MP .528 cam, or call Duane Porter and get advise from someone that KNOWS what they are doing. twocents BTW, I'm getting 15"(N) @ 1000 rpm with a baby Thumpr cam in a lowish CR(9.6:1) stock stroke 400 with a tunnel ram. work I've got a Crane 302 cam I'll let go cheap- never run. 232/242@ .050 112 LSA.

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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Posts: 4,861
Riverside, Ca
R70RUNNER Offline
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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
Re: Pick a cam for the Imperial [Re: feets] #2030649
03/13/16 11:32 PM
03/13/16 11:32 PM
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Garden Grove, CA
OzHemi Offline
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3/4 race cam, to go with your 3/4 of a cam gear.




biggrin

Re: Pick a cam for the Imperial [Re: feets] #2030704
03/14/16 01:09 AM
03/14/16 01:09 AM
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Utah and Alaska
astjp2 Offline
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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!
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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Not2farfromNashville, TN
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Rug_Trucker Offline
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Aluminum heads and not taking advantage of them? realcrazy 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!"
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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Not2farfromNashville, TN
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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!"
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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Niles , Ohio
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therocks Offline
oh wait.but hey.lets see.oh yeah.
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oh wait.but hey.lets see.oh yeah.
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Posts: 21,050
Niles , Ohio
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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