Installed the Jacobs ignition in April 99 and the recommended gap was
.060". I did not see any noticeable improvements with the Jacobs system.
Had the engine turned on a dyno before we started our trip.
Just returned from our first six months summer excursion of 17,000 miles
around the US and Canada. Only had three problems: one a nail after
16,500 miles that cause a slow leak which was fixed before we crossed the
desert, a tire valve that worked loose after 12,000 miles and front rear
wheel knocked out of alignment [i think] when we fell into a deep hole in
Yellowstone that was covered by snow. Goodyear truck tire dealer
measured the wear and said it was 3/16" toe in out of alignment. He said
it was common with tandem wheels. Max Purdy at Buskirk/Rush squeezed us
in and shimmed it exactly 3/16" to bring it back and we were on our way.
We stayed overnight at their facility so they could work on it first
thing in the morning. Good experience!
The money spent replacing worn stuff paid off because we had no
breakdowns. My thanks to Bob Lamey who did all the mechanical work.
Also installed the Platinum Gasaver @ $168 that enable us to use 85
octane without knocking, even at 11,000 feet and 12% grades. Dyno tuned
with this set up. Average gas mileage was 9.7 mpg over 17,000 miles (1752
gal @ $.20/gal less for 85 saved $350 over premium gas). MPG varied
from a high of 12.7 when we were at 25 to 55 mph in the upper east coast
back roads to a low of 7.4 when we were cursing at 80 mph across
Oklahoma against 25 mph head winds. Measuring mpg on one tankful is not
accurate, but it's a rough gage.
Used the GMC goodwrench service on the road. It always took two mechanics
to make the guaranteed 30 minute service, but they always made it. Even
met one mechanic who serviced the GMC Motorhomes when they were new. He
is just a few years away from retirement and plans to buy one to travel
in. We had a great talk and I gave him a lot of current GMC information.
Need to carry a copy of the GMC Motorhome Marketplace to show all the
people who said they were interested in looking into a GMC. Passed out
the telephone # many times and went through all my Jim Bounds cards.
We have 250 pages of journal notes and 40 rolls of film to edit this
winter for our trip journal. We met and talked to over a dozen GMC owners
on this trip. One owner we met at a rest station waved us off when we
parked next to him. He said that when you get these GMC's too close to
each other, they reproduce. Sure enough, a third GMC pulled in for lunch.
.060". I did not see any noticeable improvements with the Jacobs system.
Had the engine turned on a dyno before we started our trip.
Just returned from our first six months summer excursion of 17,000 miles
around the US and Canada. Only had three problems: one a nail after
16,500 miles that cause a slow leak which was fixed before we crossed the
desert, a tire valve that worked loose after 12,000 miles and front rear
wheel knocked out of alignment [i think] when we fell into a deep hole in
Yellowstone that was covered by snow. Goodyear truck tire dealer
measured the wear and said it was 3/16" toe in out of alignment. He said
it was common with tandem wheels. Max Purdy at Buskirk/Rush squeezed us
in and shimmed it exactly 3/16" to bring it back and we were on our way.
We stayed overnight at their facility so they could work on it first
thing in the morning. Good experience!
The money spent replacing worn stuff paid off because we had no
breakdowns. My thanks to Bob Lamey who did all the mechanical work.
Also installed the Platinum Gasaver @ $168 that enable us to use 85
octane without knocking, even at 11,000 feet and 12% grades. Dyno tuned
with this set up. Average gas mileage was 9.7 mpg over 17,000 miles (1752
gal @ $.20/gal less for 85 saved $350 over premium gas). MPG varied
from a high of 12.7 when we were at 25 to 55 mph in the upper east coast
back roads to a low of 7.4 when we were cursing at 80 mph across
Oklahoma against 25 mph head winds. Measuring mpg on one tankful is not
accurate, but it's a rough gage.
Used the GMC goodwrench service on the road. It always took two mechanics
to make the guaranteed 30 minute service, but they always made it. Even
met one mechanic who serviced the GMC Motorhomes when they were new. He
is just a few years away from retirement and plans to buy one to travel
in. We had a great talk and I gave him a lot of current GMC information.
Need to carry a copy of the GMC Motorhome Marketplace to show all the
people who said they were interested in looking into a GMC. Passed out
the telephone # many times and went through all my Jim Bounds cards.
We have 250 pages of journal notes and 40 rolls of film to edit this
winter for our trip journal. We met and talked to over a dozen GMC owners
on this trip. One owner we met at a rest station waved us off when we
parked next to him. He said that when you get these GMC's too close to
each other, they reproduce. Sure enough, a third GMC pulled in for lunch.
