Would my dual snorkel scoop be affecting my cooling at highway speed?
Thanks AJ, That's the answer I was looking for!
Cley
If you want to experiment with cruise timing, get a dash-mounted, electronic dial-back, timing device and set it to it's mid-point before setting your base timing. Now you will be able to adjust the timing plus or minus 7.5 degrees, from the driver's seat, while flying down the hiway.
Find a section of flat level pavement at least 5 miles long. Enter the section at a stabilized cruise speed with a locked foot-feeder. Watch the speedo for the first mile. Then crank in plus 3 degrees; and do not move the gas pedal. If the car increases in speed, it liked it. If it slows it didn't.
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I once had employment about 25 miles away, and every day I would go thru this section. And almost every day I would work the device. The first few adjustments were a no-brainer, she liked it. After a while, it got to a point where it seemed to plateau, more timing did not significantly increase the speed thru the section. I quit at 63*, @62mph=2150rpm. I arbitrarily cut it back to 58*, because the last 5* had not shown a significant speed change. Being a pioneer in this effort, I felt better safe than sorry.
> I had made a two-stage throttle return system, so I could accurately always hit the same throttle opening, and I didn't have to concentrate on keeping my foot steady..
> My 367engine was making 185psi,and the VP calculated to over 160, so the throttle opening to make 62 mph was very very small. It vacuum peaked at about 2100, or a little less.
> there is no way to build a power curve, for a 4-speed car, and still make 58* at 2150 for cruising; the biggest Vcan I could find was a 20* can, and I modded it to squeeze 2 more out of it, for a total of 22*. My engine was happy with the power curve I had built, using this same dial-back device to optimize it. So at 2150 the mechanical timing was 23*. So the best the non-dial-back system could do was 23+22=45. The DB had to kick in the rest or 13
> there's just one little thing;
YOU have to remember to back it off when you come out of cruise mode.
I ran 32/34 power timing, and if I hadda forgot to dial out the cruise timing, it would have been 33+13=46, and Ima thinkin that 367 wouldda complained about that under WOT,loudly.
So be forewarned; if you experiment with this, the payback in fuel efficiency, with a high overlap/ short extraction period, cam, is not that much, and if you melt your motor down by forgetting about the DB, I will not buy you a replacement.
> With an ever so slightly smaller cam however,the mpg increase was, for me, phenomenal.