Cam and Stall Convertor

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HemiTM

HemiTM

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Looking for some advice on a torque convertor. I am running a 904 with 3.91 gears and a 318. 26 9.5 14 Hoosiers. What stall should I run with the cam listed below. This is a drag car only.




Brand
COMP Cams
Manufacturer's Part NumberK20-222-3Part TypeCamshaft and Lifter KitsProduct LineCOMP Cams Xtreme Energy Cam and Lifter KitsSummit Racing Part NumberCCA-K20-222-3UPC036584046912Cam StyleHydraulic flat tappetBasic Operating RPM Range1,300-5,600Intake Duration at 050 inch Lift218Exhaust Duration at 050 inch Lift224Duration at 050 inch Lift218 int./224 exh.Advertised Intake Duration262Advertised Exhaust Duration270Advertised Duration262 int./270 exh.Intake Valve Lift with Factory Rocker Arm Ratio0.462 in.Exhaust Valve Lift with Factory Rocker Arm Ratio0.470 in.Valve Lift with Factory Rocker Arm Ratio0.462 int./0.470 exh.Lobe Separation (degrees)110Grind NumberCRS XE262H-10Computer-Controlled CompatibleNoLifters IncludedYesLifter StyleHydraulic flat tappetValve Springs IncludedYesOutside Diameter of Outer Spring (in)1.494 in.
 
You didn't ask this but I don't think that's enough cam.
 
I didn`t think so either. Talked to the Comp Cams rep. at the March Meets and this is what he recomended. I told him I felt I needed the 268. He said it was not the right cam for my set up. I have not purchased the 262 yet. Should I get the 268 instead?
 
they always told me to get a converter 800 to 1000 in to the RPM range of the cam.I would go with a 3000 or 3200 If I was guessing.but I have learned to call A well known CO. and let them do there thing...Artie
 
Lets see what the concensus is from some other members. That's just one peon's opinion though and I'm stickin with it. lol Because that 318 is gonna make power up high and that's where the cam needs to come in. But again, that's just my opinion.
 
Drag car only... a 262H... are you kidding me???

Maybe if the idea of a drag car is something you fire up and drive over to the hot dog stand because you're too lazy to walk! LOL

That cam would not be my choice for a drag car.

As far as converter goes, put as much as you can stand in it. Drag car only, put an 8" converter in it
 
crackedback said:
Drag car only... a 262H... are you kidding me???

Maybe if the idea of a drag car is something you fire up and drive over to the hot dog stand because you're too lazy to walk! LOL

That cam would not be my choice for a drag car.

As far as converter goes, put as much as you can stand in it. Drag car only, put an 8" converter in it
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Would the 268 be the best way to go. Stock bottom end 318. Turning 13.60`s with all bolt ons right now. Hoping to get the elusive 12.99!!
 
I have to agree, I don't understand the cam choice for a drag only car....but with that said, I would definitely go with a lot more stall than if it was a street/strip car (since that cam would probably work with a stock converter). Since your cam says it makes power to 5600 RPM.... I would guess your max HP would be in the low to mid 5000 RPM range...Sheesh!....I don't know, this is not a combo I ever imagined....I can tell you that you should be looking for a converter that "stalls" just a hair past your torque peak for the best ET (I'm guessing a 3500 stall??).

Honestly, for a drag only car, I would say get a LOT more cam, and a 8" converter.
 
There's enough experience here to get you the right stuff. Can you give specifics about your engine? Tell us what all parts you have in it and all the specs...compression and all that good stuff. We'll get that little beeotch screemin.
 
I've run that cam in several 318's before and it requires no extra stall from a converter. The best run I have had out of it many many moons ago was mid 13's. Back by a 4spd in a "E" body though. I just rolled it off the line as hard as I could. First run was high 13's.

Dead stock 318 with bolt on's?

What year 318 and what is the Compression ratio?

If your in the 9.0-1 area, I'd step up in cam. If not, look into milling the heads. Your going to need some extra squeeze in there.
 
Currently I have a 1971 318. Not sure of the compression. Bolt on`s include Holley 650 DP jetted at 68 and 70. RPM Air Gap. Hooker Headers. Mopar Electronic Ignition. This is connected to a 904 with reverse manual valve body. 8.75 sure grip with 3.91`s. Hoosier 26 9.5 14 QTP`s. Best run so far is a 13.61. 60 foot @ 1.97. It is time to add a new stall and cam. Next year I am going to stroke a 360. But in the mean time I want to get as much out of this little teen as I can without having to tear the engine apart. The car is gutted. Kirkey seat, roll bar, battery in trunk. This car has been built from the back forward. All help is appreciated. Thanks
 
I bet it still is the stock compression ratio. You know what I would put in it? I think I'd go with the middle Comp Thumpr cam. They are supposed to be aggressive and yet still make GOOD power with stock compression ratios. Then pick your converter to match that cam.
 
I know you asked about cam and converter, but I think you also need a lot more gear. 3.91s are not near enough gear for a drag only car. What's your RPM through the lights on the top end?
You want that little motor getting into it's power range ASAP and getting you going down the strip.
Way back in the early '70s I was running 4.89s in my '69 Dart on the street behind a stout 340 and a reverse-manual shift 727. Radical for the street? Yep, but it sure could get you home from the store before the ice cream melted.
 
That's kinda dependant on the camshaft power band.
 
HemiTM said:
StrokerScamp.....I have decided to go with your suggestion. If this and a new convertor gets me into the 12`s. You will get all the credit. :burnout:
Click to expand...

Ha. Well I aint drivin the thing. Why not wait a little bit? Somebody else might have a better idea.
 
HemiTM said:
RPM through the traps is 5000. What gear do you suggest?
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Your gearing is going to be based on how tall your tires are and what rpm you want to run thru the traps with...

you should be at least up over 6000 rpm....remember an engine is a air pump...faster it pumps faster it runs...

converter wise ....you should at be flashing upwards of 4500 rpm at minimum....



and get the matching valve springs for the cam....
 
Race car, put a solid cam in it, like a XS274s or XS282S and an 8" 4500 converter and run it in the 12's...

Put 4.56's in it too.
 
flyfish said:
Aren't those Thumper cams mainly designed to "sound" big? This is quite a split on the I/E duration. Have you used this one before? Just curious.
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No, they are just like the Whiplash cams from Hughes. They are designed to make the most out of stock compression ratios...while sounding good. ...and yes I have used that same cam in a customer's otherwise stock 318 with thermoquad and headers.
 
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