"nrp" wrote in message
ups.com...
Collins 172 engine was same as mine. Lyc O-320E2D low compression.
Only mine has been fed a minimum lead diet to get 1700 hrs TT & 30
years since new (i. e. no OH!).

And as stated elsewhere, the LOP procedure doesn't work with the crappy
fuel/air distribution systems in HO engines with carburation or FI.

Interesting RC attitudes on the GAMI observations. I think he was very
aggressive in leaning his 172 to the point of roughness - and he got
plenty of that thru the years he had it. At the time though his 172
problems sure scared hell out of us & our (then) new bird. His is
history. We still have ours.

I'm coming up on 1500 hours in mine which has been run 60LOP for five years.
That has been all 100LL. The last annual/maint showed virtually pristine
cylinders and plugs.

If someone has the right fuel availability/engine combination, then hell
yes, use Mogas. 100LL here is $4.15 a gallon and that's pricy, so using
Mogas would be "more better", but not with my engine.

The issue with Collins and the article he wrote was the situation with his
P210, not his Skyhawk. Like so many others, he jumped in without learning
the method. It was shear blockheadedness.