MELLING CAMS ??

[pedal2themetal45]

HI ALL
My machinest and I were looking at cams and he suggested this melling cam. Are the melling cams any good?
# FOV-9
Duration @.o50 is 184 in 185 ex
Valve Lift of 367
duration of 254 255
Lobe Centers at 112 108
Does this look like a good cam for a stock set up 200 with a little more than stock grunt. He thinks its RPM is 1,000 to 3500...
Thanks
tim

 

[CZLN6]

Howdy Tim:

The numbers are very similar to the stock OEM late model 200/250 cams.

OEM specs are 256 degrees of duration, .368" lift. I have never seen lobe center specs on these cams. I guess I need to measure for myself. FoMoCo varied cam timing by using altered cam timing gears to retard. Theory is they did it to gain a little more low end torque and to improve EPA numbers.

This cam would be a small step upgrade over the earlier 200 cams which were 252/256 duration with .348" lift. In real world driving the difference would not be noticeable.

The profiles on these cam lobes is very conservative. I don't have .050" durations stats. That would tell if the Melling has a more agressive lift ramp.

Adios, David

 

[wsa111]

Tim, melling cams are ok, however that cam is really mild, I would get something in the 194 deg-204 @ .050 & lift at valve over .400
Do you plan to mill the head & use a thinner headgasket? Also what carburetor are you planning to run? Could you give your intentions?
William

 

[pedal2themetal45]

Thanks David
wsa111
my Machinest cc the block and is cc'ing the head and going to get the compression thickness of a gasket so we can get 9.5 cr. I'm planning on a 32/36 weber. and the bigger 250 stock exhagust manifold 68/75 I beleve for stock look. I'm not realy going for performance just some tq'y 200cu. grocery getter/econo daily driver , in my 61 Comet (it was a 170 stock anyway). My truck is my performance rig.
Tim

 

[wsa111]

Tim, if you are running 9.5 compression, you better add some camshaft duration or you will be running 93 octane.
With that much compresion you better run 212 to 214 degrees at .050
Get in touch with mike @ www.fordsixparts.com
I would run less compression & run a smaller camshaft if you want a mild engine. William

 

[CZLN6]

Howdy back Tim:

I'm not aware that the 250 exhaust manifold is any different that a 200 for those years. The first year for the 250 was 1969.

What William is refering to is that a longer duration cam bleed off cylinder pressure at lower rpms which helps to control pre-ignition at lower rpms and lugging conditions.

I agree with William. For your stated purposes, I'd recommend a CR goal of 9:1. You should also take some other precautions when building this engine. Get as close to a zero deck height as possible. Polish the combustion chambers. Be sure to use small dish pistons.

Your elevation in Boise will also be a plus in tolerating a higher CR. Be sure to use a little more initial advance too.

What trans are you going to use in the Comet?

Adios, David

 

[pedal2themetal45]

HI David
I've been thinking as well about the cr.. I think I'll ask him to cut it to 9.1 instead.. I have a 3spd out of a 71 maverick, high mount 2 bolt starter(from the plate to the tail shaft.)
I was just thinking about a cam change as the motor came with a reground cam in it and I don't know what the specs are on it ( the shop that rebuilt the motor is out of business, but my machinest said it looks good) I didn't want to pay $75.oo to get it degreeded.. I beleve the block is a D8. I'd have to look don't remember (the block cc at 15 thousand with dished pistons) . I think I can pull the cam out (my machinest said) there should be some kind of marking on the back side as to what it might be.. could this be right??
On the exhaughst manifold I was just thinking of what you had said about the 68 to 75 I beleve was a better stock manifold, I just thought the 250 was different than the 200. guess not..
Thanks
tim