i have heard on sveral post now that the edelbrock cams are less than great. why is that? any personal feelings on the subjest? i am asking because i was goin to get a ebock cam to match the carb,intake and timing set as well as valve springs. this (i thought) was the best bang for the buck and everything would be matched. i like the comp 265deh but cant afford the k kit 400 some
dollars correct? can i run a comp 265deh cam with the other parts. what kind of power will any of theese combos work out. i would like about 350 horse and 450+ lbs of torque. if it is close that is cool. i would also like a good "semi lumpy" idle.

Thanks
Jesse

 

Here are the results of a dyno simulation of three cams. The motor is a 400 +0.030, badger pistons, 600 CFM, headers, and good flowing 351C-2V heads.

255DEH
Torque = 441@2500, HP = 308@4000. The Overlap is 40 degrees, and the lifter acceleration rate is 2.73.

265DEH
Torque = 426@2500, HP = 326@4500. The Overlap is 50 degrees, and the lifter acceleration rate is 2.71.

Edelbrock
Torque = 389@2500, HP = 333@5000. The Overlap is 63 degrees, and the lifter acceleration rate is 2.27.

With 63 degrees overlap, the Edelbrock will give you the lumpiest idle. The torque at low RPMs is not good, but it produces the most HP at 5000 RPMs. It would be a better cam with a faster lifter acceleration rate.

The Comp Cams 255DEH is very popular here, because it produce the most torque at low RPM. It has low overlap, and good lifter acceleration rate. It's RPM range is limited.

The Comp Cams 265DEH is a good trade off for more high RPM operation. It only gives up a little torque at low RPM for increased high RPM power. It also has good lifter acceleration rate.

For more Horsepower without losing low RPM torque, you need a Hydraulic Roller cam with higher lifter acceleration rates, higher lift, and heads that will flow at lifts in excess of 0.500".

 

does the desktop dyno calculate fuel rate at different points on the curve? I am looking at that 255 deh, and curious about the mileage versus the other camshafts. I was reccomended the summit 5200. How does that figure in?

 

ok i see very clearly now that cam is out. but can i simply swap the 265deh for the edl? or what do you suggest? ill look at thoose k kits again bc i know that what i will hear. where is the cheapest?

 

Danlee-

How does the 275DEH cam compare? What are the numbers for that with the same setup?

 

No, neither Desktop Dyno nor Dyno Sim will calculate fuel. two things to look at to get an idea of mileage are overlap, and at what RPM peak torque occurs vs at what RPM will the motor be run most of the time.

Give me the specs on the Summit 5200. or just compare them to the Comp Cams cams.

 

The EDL probably requires less spring pressure, since it has slower ramp rates. This makes the installation cheaper, since the kit is cheaper.

Try Summit, or Jegs, or P.A.W. to get prices on the k kit.

 

Torque = 407@2500, HP = 337@4500, Ramp rate = 2.78, Overlap = 60 degrees.

 

ok WOW which kit from comp? some of them arent as much as i thought. was i reading right or do they come with non roller timing sets? which kit has cam 265deh cam? so any input on this new topic would be good, thanks for the guidance on the edelbrock stuff i would have made a costly mistake.

thank you.

 

The 265DEH 'k' kit is K32-207-3. You can buy the CL32-207-3, which is cam and lifters only. The springs can be purchased seperatly. The part # is 972-16.

I don't know if the timing set is a double roller type. If not you should buy the piece parts instead of the kit.

 

When purchasing a kit from Comp., the timing set is a standard set. To get a double roller set you must order it seperately. I had to send my standard set back, they credited me for it, and they sent me a double roller set. The crank sprocket has 3 key-ways in it so you can set the valve timing retarded, straight up, or advanced. Setting mine straight up resulted in the cam sprocket timing mark being at the 6:00 position and the crank sprocket +4 mark being at the 12:00 position, lined up with the cam sprocket mark. I did "degree" the camshaft afterwards and it is in fact set "straight up".

 

danlee -

Brand: Summit
Product Line: Summit Camshafts
Cam Style: Hydraulic flat tappet
Basic Operating RPM Range: 1,500-4,000 RPM
Intake Duration at 050 inch Lift: 204
Exhaust Duration at 050 inch Lift: 214
Duration at 050 inch Lift: 204 int./214 exh.
Advertised Intake Duration: 262
Advertised Exhaust Duration: 272
Advertised Duration: 262 int./272 exh.
Intake Valve Lift with Factory Rocker Arm Ratio: 0.484 in.
Exhaust Valve Lift with Factory Rocker Arm Ratio: 0.510 in.
Valve Lift with Factory Rocker Arm Ratio: 0.484 int./0.510 exh. lift
Lobe Separation (degrees): 112
Intake Valve Lash: 0.000 in.
Exhaust Valve Lash: 0.000 in.
Computer Controlled Compatible: No

 

http://store.summitracing.com/defaul...5&autoview=sku

the above is a link to the summit cam. Is there a way to get enough information to figure out the area under the torque curve, like under 3500 rpm's? Does it only show peak, or can it give more information. I am interested in using this as a dump truck and towing.

 

Dyno Sim plots a graph of Torque and Horsepower vs RPM, just like a real Dyno. It is difficult to copy the graph, but here are the torque #'s. BTW, I set the Intake Center line at 108 degrees, since it is not specified.

RPM/Torque = 2000/428, 2500/430, 3000/425, 3500/434, 4000/412.

It is a flat torque curve, and it has an interesting double peak. That may be due to the ICL should be 106 degrees, not 108 degrees.

 

if yu want to spend big money you get a retro roller cam from comp- I got a special grind done up and the block is being prepped by the machine shop- have to put in cam, lifters and set the retro cage center and drill the block- then remove the cam- cam bearings and clean the block and put in new cam bearings and then get ready to build it....whew...for sure. the kkit for the roller cam is a bit over a grand i believe.