A guy brought me an Oliver 1650Lp that had a vacuum advance. First time I had seen that on a tractor. Seems like a good idea for chores and putting around. I didn't measure the amount but the vacuum advance was not very much.
Related to this discussion is combustion chamber turbulence. Later model heads are much better than earlier in this respect. Tightening the quench clearance on older motors helps. How tight depends on RPM and how brave you are.
The tightest one I built was a 350 with .028 between the piston and the head. True 9.5:1 compression and flat top pistons, iron heads, Quadrajet. Sitting in a 3800lb Camaro it could deliver 25mpg at highway speed with 23 being more common. No expensive parts in it.
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Today's Featured Article - 50 Tips for Ford N Owners - by Bruce Haynes. Over the years of owning these three tractors, I have managed to refresh what little mechanical knowledge I had and add a little more, thanks to the wisdom and helpfulness of many fellow N owners. So, now it's my turn to share a few of the tips I've picked up.
... [Read Article]
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