cam duration question for 416.

[ltrripp11]

fellas

could ya give me an oppinion on a cam swap? looking to go from a comp xe268/280 duration cam to edelbrock performer rpm cam with 308/318 duration in a 416 stroker. do you feel that amount of duration difference would bleed off to much compression? i currently have great compression with an average of 190lbs across the board with all plugs out, throttle open and a warm motor. just curious before i pull the trigger on this cam. i do have another post and im still trying to learn here.

 

[805moparkid]

so that cam dur @ .050 is around 255? i imagine that shouldn't be to bad... im running a 246 @ 50 on a slant so, 255 on almost twice as much cubes should be nice......

 

[412 Stroker]

I could be wrong but I don't think your gonna find too many peps in here that recommend any edlebrock cams, I have a Thumper in my stroker, and I like it, but it's knda like what are you looking for has to be a package, like what heads you have, gearing, stall etc.

 

[moper]

yup. I wouldn't use that Edelbrock cam. You wont lose much with it. I dont think you'll gain much either.

 

[crackedback]

Depending on what you want to do, me being more of a drag strip racer, I wouldn't put anything in a 400+ inch engine that's less than about 242-245 at .050

Advertised durations aren't really what you want to look at. when selecting a camshaft.

The XE268 will idle like a stock cam in a 400 inch engine. It's not big at all. The ede cam is a slow lobe. If I had to choose either for a stroker, it would be neither, I'd find something else.

 

[ltrripp11]

412 stroker.. that thumpr cam was my other thought "cl20-601-4 with 287/304 duration" thats the middle selection. is that the one you have? the only thing i was concerned about with that cam is to much annoying shake at idle. i was looking at the eddy because it would compliment the rest of my package (rpm intake & rpm head later on). i figure the engineers must know what there doing making these work together? in any case whats your experience with that thumpr cam (shake, lope, performance, etc) ??

 

[Dustedu2]

Depending on what you want to do, me being more of a drag strip racer, I wouldn't put anything in a 400+ inch engine that's less than about 242-245 at .050

Advertised durations aren't really what you want to look at. when selecting a camshaft.

The XE268 will idle like a stock cam in a 400 inch engine. It's not big at all. The ede cam is a slow lobe. If I had to choose either for a stroker, it would be neither, I'd find something else.

You know, it's really hard to read posts with those bad boys jumping all around. \\/

 

[rumblefish360]

so that cam dur @ .050 is around 255?

The Edelbrock, no. It's lower. IIRC, something like 244 @ 050.

ltrripp11

Figure out what RPM range you want the engine/car to perform in and select the cam from there. Couple it with as much lift as the heads cn handle before the airflow stalls.

This will get you well into the ball park. Deduct 200/300 RPM due to the long stroke of the engine.

 

[64physhy]

Strokers really tame the duration. Like crackedback said, the XE268 would idle with about the same manners in a stroker as a stock cam would in a stock stroke engine. I have an XE295HL in mine, which has a duration of 256 @ .050. It's probably a little rougher idle than you would want, but still not nearly as rough as I was expecting. I've heard a lot of people like their Lunati Voodoo cams. I think it's the 60403 that several people here are running. Maybe the 60404.

 

[MoparAnglia]

The Edelbrock, no. It's lower. IIRC, something like 244 @ 050.

ltrripp11

Figure out what RPM range you want the engine/car to perform in and select the cam from there. Couple it with as much lift as the heads cn handle before the airflow stalls.

This will get you well into the ball park. Deduct 200/300 RPM due to the long stroke of the engine.

Actually only 234 @.050 on the intake! the lobes don't have ramps, they have slight inclines...

 

[ltrripp11]

thanks and keep the input coming pleeeez. still undecided but im zeroing in on what i should be looking for with each post and piece of information.....

 

[rumblefish360]

Actually only 234 @.050 on the intake! the lobes don't have ramps, they have slight inclines...

LOL, I checked and your right! LOL, good description on the ramps, er, I ment inclines.

thanks and keep the input coming pleeeez. still undecided but im zeroing in on what i should be looking for with each post and piece of information.....

Well, how do you want the engine/car to perform? At what RPM do you think you want to cruise in? Do you have an ET in mind or a HP level you want to achieve?

 

[moper]

I have one with a hydarulic Crane H302-2 that idles clean at 800 and gets 17mpg... That cams 238° @ .050 intake, 248° @ .050 exhaust. It also pushes 3800lbs to 12.80s @ 109mph with 3.23s on pump fuel.
One I just delivered has a hydraulic roller, 248° @ .050 intake, 252° @ .050 exh, and that one would idle fairly well at 700 with no load (running stand). The 2nd one is more compression and RPM heads but similar carb/intakes.
A very nice idle will be there with most cams around 240° but the power will be peaky and more torque than horsepower. If you want to make decent power with an idle around 850-900, go 250° @ .050 and you'll bring the horsepower up without losing torque, but the torque curve will be less flat.

 

[ltrripp11]

well after much research with you folks and phone calls to summitt tech etc i have decided to go with the thumper cam cl20-601-4 with 287/304 duration and 497/483 lift for my particular application and shy away from the eddy. it may be an alright cam but i like comps reputation a little better on cams. i want to thank 412 stroker in particular for the detailed and informative private message. that was great. all were knowlegable and helpfull in learning so thanks to each. regards: bill