Does anyone out there knwo the cam profile of the original cam used in the Hyper-Pak package? I have found some into, but I cannot find the valve timing ( when each valve opens and closes in relation to TDC)

so far I have discovered:
Intake: 276 degree duration
Exhaust: 268 degree duration
Overlap: 52 degrees
Lift: .430 for both intake and exhaust

I am playing around with cam profiles on Desktop dyno and I would like to get some numbers for the Hyper-Pak package. Thanks!

Reed

reed@seanet.com

Hey, Reed, how's school? I believe you have enough info to calculate the events. I'am pretty tired right now, but will fool with the numbers later. Chk a previous thread, a month or two ago. Doc posted a coupla graphical diagrams on cam timing.

fglmopar@aol.com

You know, that sounds like the '68 340 4 speed cam grind.

fglmopar@aol.com

School is going pretty good. The second year of law school is a much different experience than the first. Much more laid back. I am no cam expert by any means. I was trying to figure out the valve timing form th einfo I have but I just don't know how to figure when the intake starts opening. If I had only one definite degree for a specific valve event I could figure the rest out. But all I know if how long the valves are open and how long they overlap. I need a specific degree BTDC when the intake opens or something like that to figure the rest out.

AND! To top it all off the wiper motor conked out on my 78 Dodge shorty van today, and with the rainty season in Washington coming up I NEED functional wipers. I think the Mopar Gods are trying to keep me driving my Mom's Ford van as long as possible... I might just bite the bullet and drive wiperless to the SSCOA meet on the 22nd since neither of my Cuda's are driveable.

If you can figure out the valve timing I would really appreciate it! I ran the lift specs and estimated that the intake opened at 26 BTDC and Desktop Dyno put out some impressive numbers. Way over 200 ft/lbs of torque and some snappy HP too. Since I am more interested in low RPM torque I will play around wit hthe numbers some more and work up my "dream cam".

Reed

reed@seanet.com

I hear you about the rainy season. I've been working in my 'spare time' roofing a house, trying to make it rain proof. It's supposed to rain Sunday night, so I've got to stay with it.
I think your computer program already assumed split overlap and calc'd the events for you. Assuming split overlap, I calculate int open 26 before TDC, centerlines at 112 ATDC, closes at 70 ABDC; exh opens 62 before BDC, closes at 26 ATDC.
Are you sure about the int/exh durations? Could they possibly be reversed? Every 'dual-pattern' cam I've seen has longer exhaust duration. Then that would be more like the '68 340 4speed cam specs.
It sure is fun trying different cam profiles on the computer, isn't it?
Oh, here's the address = <A HREF="http://www.dutra.org/pictures/engine/cam-cards.jpg">http://www.dutra.org/pictures/engine/cam-cards.jpg</A> for that valve event/cam timing diagram. I include that in case the link thing doesn't work out.
I find it very helpful when you're trying to visualize these things.


fglmopar@aol.com

I am pretty sure about the durations. I have found the same number slisted in two different sources, both of which I believe are credible. Destop Dyno only asks for lift of each valve and the opening and closing degree of each valve. It does not have the option (at least my copy doesn't) of inputting the duration, lobe separation or centerline of the cam. I loaned my laptop which has the program on it to my sister's co-worker for the weekend so I will have to check out the program closer when I get the compuer back next weekend. To be honest, those durations were just listed side by side with no indication as to which was the intke and which was the exhaust. When I get the laptop back I will run both profiles and see which one I like better.

I am really glad that the roof on my house was re-done just a couple years before my family bought it. Unfortunately a couple weekends ago we discovered that the cement foundation in our house was damaged by that big earthquake a couple years ago and water was leaking into my sisters bedroom. I spent labor day weekend ripping out the wall and carpet in her room, patching the cement, rebuilding the wall, and laying new flooring. It seems to be holding up okey, but the real test will be this winter.

Thanks again for the info and the cam diagrams! I want to try and build amotor with good low-end torque to be installed a commuter car. I am figuring that if I use 2.96 rear gears, a lock-up tranny, and build the motor to get optimal torque in the 2500-3500 rpm range, I should get decent gas mileage by using the Holley 2235 staged 350 CFM two barrel. I want to build this motor and install it int the green 66 Cuda I just bought and use the 273 that was in it for my 66 formula S.

Anyway, thanks again!

Reed

reed@seanet.com