Steve Bryant

iTrader: (1)

Noodleman,
Here's the graph I promised showing the 6.0 L (364) with the 200°/206° 109° LSA @ 0° advance versus the 212°/218° 114° LSA @ 0° advance versus your suggested 212°/218° 110° LSA with 4° of advance. To my surprise, your proposed cam (in theory at least using DynoSim) actually works slightly better than the 212°/218° cam that I have! However, I'm sure that the idle would be choppier, the emissions greater and the gas mileage poorer. A program like DyonSim or better Dynomation is a great tool in planning engine modifications. It let's you see in to the future with a bit more clarity when used properly.

All my best,

Steve

yurs78

This helps alot, thanks. I always thought that you could tighten up the LSA and get back the lost torque that the increased duration gives up down low. I can see that it's minimal. The only true way to keep bottom end on a given displacement is to keep the duration small. Thanks again.
By the way you said that you have better economy with the smaller cam. What is it in the city and on the highway, no towing.

Steve Bryant

iTrader: (1)

Now, I get about 11 MPG city, 14.5 MPG highway if I stay around 55 to 60. When I drive about 75, the mileage goes to about 13.5 MPG. I lost about 1 MPG city and highway with the other cam. It was often worse because I would horse around more at WOT with the bigger cam. It was too much fun to accelerate on almost every on-ramp at WOT . . . not necessary, just fun!

Steve

yurs78

Ha Ha! I can't blame you for pounding on it! I know what you mean. I don't like the mileage I get either but I can't help myself.
Thanks!

HEADHUNTER92

hi steve my name is jeff and i see you are using dynosim....i very often use a program called engine analyzer. it seems you are playing with different cams and adjusting the cam timing to get the best result.when im using engine analyzer i play with degreeing a cam and found on two seperate occasions that when the cam was retared around a 1.5-3.0 degrees the horsepower increased signifigantly for just adjusting cam timing. so i tried it in my sprintcar and was totally amazed as to how well it ran. actually surprised but i had to adjust the gear alittle different from normal.but when i did it was fast as hell. have you ever run across any of this ?