the other thing about the old pump is that if it was factory it was tuned to the spec of fuel from 30 years ago
We put my old pump on the test bench. It preformed quite well, however the governer was kicking in about 1000 RPMs too early. Timing advance/retard was inline with a stock pump and it was actually at the upper limits of the test sheets for fuel delivery, until the governer kicked in. There is no disputing the fact that power was significantly increased well before the governer kicked in, and well beyond that as well
AFAIK the specs for calibrating a pump have not changed, but I will confirm with Giles tomorrow (if I remember)
If anyone wants to send me a rebuilt pump I will install and dyno it where my car was previously dynoed. (I'll send it back of course
) It doesn't change the fact that I work for Giles though. If anyone wants to drive my car, I might let you. Just ask at a GTG.
Compression on my engine is either 350 or 250 all across the board. I know that's a wide spread but I used 2 different compression testers and those were the numbers I got from each gauge. Obviously one is wrong and I'm working to find out which number is correct.
I don't doubt that you did get more than 49 MPG Andrew, and your driving styles most likely were the key difference. Or the fact that my tranny is on it's way out (bad bearing somewhere in it) Either way though, the pump alone has improved my fuel ecomony with little to no change in how I drive. I say "little" because I probably accelerate faster now that I actually can...
This is also of course only 1 tank, so who knows. I do go though a tank a week and a half to every week so updates will be fairly constant.