MacGregorSailors.com

Lou camilli is getting close to making spark plugs with the directhits capacitor built into the plug itself (to be called "Pulstar"), so updating the DirectHits web page with a menu item for outboard motors is not going to happen. I suspect he is going after the OEM market so engine companies can make them a requirement instead of an optional aftermarket add-on. IMHO, the DirectHits or Pulstar concept will become the standard in the same way that the AGM batteries will replace wet cell because both offer greater efficiency.
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Please calm down if you are getting upset because I said DirectHits worked well for me, I am not trying to sell DirectHits, I just want someone to try them in their outboard on a Mac26 and post the results.
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DirectHits have their best effect on engines running under heavy load and at higher RPMs, that describes the Mac26 very well, and all but the most powerful tow vehicles as well. If you don't make your engine work hard very often, don't bother with DirectHits, but if you do run it hard, I bet you'll be happy to have the DirectHits, once your try them.

Robert,

Please keep up the info about the DirectHits.

I would love to get a little more power at WOT, and cruising speeds, and some better mpg on my '97 Tohatsu 50hp by changing only three plugs.

It would be nice if I can get the performance of a 60hp or so from it with only a small investment.

You guys into the magical (spark plug, coil, wires, etc) gadgets for mileage

,,,Ive got some gadgets left over from the 70s you might be interested in...

Magnets on the fuel line which 'polarise' your fuel for easier flow and better combustion

Water injection into your manifold..limites combustion temperature and lets you run on lower octane fuel..

Cetane...isnt that a diesel fuel rating ????

Catalytic air filter - ionically charge your air to lower density, allowing car to run on leaner mixture


....a little engineering knowledge is a terrible thing to waste....


Chip - your mechanical vs aerodynamic friction analysis is a good model, and was exactly what I was trying to measure. At 70 mph, I had assumed the aero factor was significant.

Im not claiming to be infallible, but you know Im fairly careful about measuring things..in this case, I filled up on the highway, ran the 160 miles on I90 home, and filled up after getting off the highway. USed cruise control on both legs - I have an automatic - it runs in 4th gear most of the trip, downshifts to 3rd on the long hills in 4-5 places.

I filled the tank to the same spot on the filler neck, within 1/10 gallon error on that front. Used about 10 gallons on the trip, so that error down to a percent or so.

Conclusion - even at 70 mph the mechanical friction component is dominant in the mileage equation. That was the surprise to me, but looking at the way the Eurovan ' breaks the wind' for the Mac in retrospect it makes sense.