Is my outboard direct fuel injected?

[Akboater97]

I am new to this.
I have a 1987? (Serial number 0B167024) Mercury outboard jet and I’m trying to find out if it’s direct fuel injected? Trying to find out if it’s legal on some lakes near by anchorage with specific regulations. Thanks for the help!

 

[Scott Danforth]

1987 would be carbureted

 

[Akboater97]

1987 would be carbureted

Thanks!

 

[Texasmark]

Back in that time line, before Mercury redesigned the 115 HP 6 cylinder engine (to name an engine I had....an '88 model) to a "Loop Charged" 4 cylinder, the 6 cylinder was referred to as "Direct Charged". This is a carbureted engine (as others said) not to be confused with direct mechanical fuel injection (like today's cars) as is the case on say the Optimax engines recently produced.

Direct charging consisted of an old school "cross flow" basic design with the addition of a hole in the side of the dome shaped (old school) piston which improved performance and fuel economy to compete with OMCs highly efficient "Loop Charged" engines that were still protected by patent rights and used a flat topped piston. That "tower of power" was the best, best running, smoothest engine I ever had and a 10 gallon tank of fuel would last me all days fishing with room to spare.

Although, running 50:1 Pennzoil semi-synthetic, produced barely noticeable smoke, it wasn't essentially smokeless like the Optimax or the 4 stroke engines specified in the ordinance. You fail that part of the regulation.

 

[flyingscott]

Back in that time line, before Mercury redesigned the 115 HP 6 cylinder engine (to name an engine I had....an '88 model) to a "Loop Charged" 4 cylinder, the 6 cylinder was referred to as "Direct Charged". This is a carbureted engine (as others said) not to be confused with direct mechanical fuel injection (like today's cars) as is the case on say the Optimax engines recently produced.

Direct charging consisted of an old school "cross flow" basic design with the addition of a hole in the side of the dome shaped (old school) piston which improved performance and fuel economy to compete with OMCs highly efficient "Loop Charged" engines that were still protected by patent rights and used a flat topped piston. That "tower of power" was the best, best running, smoothest engine I ever had and a 10 gallon tank of fuel would last me all days fishing with room to spare.

Although, running 50:1 Pennzoil semi-synthetic, produced barely noticeable smoke, it wasn't essentially smokeless like the Optimax or the 4 stroke engines specified in the ordinance. You fail that part of the regulation.

Did you fact check this? OMC never had a patent on loop charging. When did modern cars become mechanically injected? The oil in the fuel is not the biggest emissions problem with carbed 2 strks. It's the unburned fuel going out the exhaust.

 

[Texasmark]

Did you fact check this? OMC never had a patent on loop charging. When did modern cars become mechanically injected? The oil in the fuel is not the biggest emissions problem with carbed 2 strks. It's the unburned fuel going out the exhaust.

Well whack me across the knuckles with a ruler. If there is any truth to this unsupported clip I was wrong. You can't patent something that already exists although you might patent the adaptation of the process, not the process per se. Can't find any thing on the www to back me up but as an investor, I surely wouldn't.

Here's the clip: https://www.continuouswave.com/ubb/Forum4/HTML/006497.html

On mechanical fuel injection, back in the mid 1950s Chevrolet 327 Cu. In. V8 was mechanically fuel injected. Don't know if that size engine had a naturally aspired version or not. Doing a Wikipedia on Chevy engines would answer that question.

On the fuel leakage problem you mentioned, if the engine is more efficient it means it gets more power for a given fuel input. If the engine is producing more power, it is using more of the available fuel in the process (BTUs) so if consumed they aren't going out the exhaust unburned!

 

[racerone]

Lawnboy power mowers were " loop charged " in the 1950's ------The concept is not new at all !!!

 

[Texasmark]

Lawnboy power mowers were " loop charged " in the 1950's ------The concept is not new at all !!!

Well in my neighborhood there were 3 or 4 us us running 4 cycle mowers and besides cutting our grass we would push our mowers around and look for work. We'd mow (only) a city lot, roughly 65x125' for $3. One of the guys cutting in our area, not part of my circle of buddies, had a 2 cycle and you always knew where he was by following the smoke. It had governor problems too as it was constantly searching for the selected RPM. Have no idea as to what brand it was. All of our stuff was worn out so if it had a decal you probably couldn't read it.

Iterating, I don't know why one couldn't/wouldn't patent the application considering the time and money in developing that 55 HP Triump with all its other refinements over the Fat 50 design criteria. Maybe its because OMC was "Boss Hog" back then and didn't worry that much about Mercury,

 

[Chris1956]

4 cylinder Mercs of the 70's were direct charge as well. They did not have the power ported pistons. Only the Mercs 1500 models up to 1977, had the power ported pistons(and matching block ports). They were considered Direct Charge as well. The power port pistons were also used in the 140HP IL6 in 1978-80, and the 115HP IL6 after that.

Direct Charge may have had to do with the eyebrow-shaped deflector on top of the piston, but I am not sure about that. If may have just been marketing.

As was mentioned, Loop charging has been around for a while. I had a single cylinder, air cooled 7 port loop charged motorcycle from 1973. That was not the first year for them, by a long shot.

Multiple cylinder water cooled cylinder blocks as found in outboards were difficult to make loop charged during the 70s and 80s. I believe we needed lost foam casting to make that a reality. The blocks were too complex for regular sand casting.

 

[flyingscott]

Well in my neighborhood there were 3 or 4 us us running 4 cycle mowers and besides cutting our grass we would push our mowers around and look for work. We'd mow (only) a city lot, roughly 65x125' for $3. One of the guys cutting in our area, not part of my circle of buddies, had a 2 cycle and you always knew where he was by following the smoke. It had governor problems too as it was constantly searching for the selected RPM. Have no idea as to what brand it was. All of our stuff was worn out so if it had a decal you probably couldn't read it.

Iterating, I don't know why one couldn't/wouldn't patent the application considering the time and money in developing that 55 HP Triump with all its other refinements over the Fat 50 design criteria. Maybe its because OMC was "Boss Hog" back then and didn't worry that much about Mercury,

Mercury had loop charged V6s in the late 70s. They also had the 18/25 hp motors in 1981. You also called an Optimax a mechanical direct injection which it is not. The corvette was a mechanical injected up until 1965 I believe hardly modern. There were other loop charged engines out there before OMC designed theirs. A patent is longer than 10 yrs I believe. Corvettes in the 50s had mechanically injected naturally aspirated 283s. This came out a yr before OMCs looper did: http://www.oddjobmotors.net/outboardjetmotor.htm

 

[Scott Danforth]

Guys.... The OP wanted to know if his 33 year old carb'd 2-stroke was direct fuel injected to meet the requirements of his boating area.

We are getting off topic

 

[Texasmark]

Guys.... The OP wanted to know if his 33 year old carb'd 2-stroke was direct fuel injected to meet the requirements of his boating area.

We are getting off topic

Yes Sir. Grin
Just an old fart here killing time, binging up mostly forgotten experiences of the past trying to stave off "cabin fever" since I am a farmer and currently house bound due to the weather. And remembering the axiom, "the first liar doesn't have a chance". Grin #2.

 

[QBhoy]

No is there simple answer. You’d need to wait a couple of decades for that.

 

[Akboater97]

Guys.... The OP wanted to know if his 33 year old carb'd 2-stroke was direct fuel injected to meet the requirements of his boating area.

We are getting off topic

True but this is pretty entertaining

 

[Silvertip]

Well whack me across the knuckles with a ruler. If there is any truth to this unsupported clip I was wrong. You can't patent something that already exists although you might patent the adaptation of the process, not the process per se. Can't find any thing on the www to back me up but as an investor, I surely wouldn't.

Here's the clip: https://www.continuouswave.com/ubb/Forum4/HTML/006497.html

On mechanical fuel injection, back in the mid 1950s Chevrolet 327 Cu. In. V8 was mechanically fuel injected. Don't know if that size engine had a naturally aspired version or not. Doing a Wikipedia on Chevy engines would answer that question.

On the fuel leakage problem you mentioned, if the engine is more efficient it means it gets more power for a given fuel input. If the engine is producing more power, it is using more of the available fuel in the process (BTUs) so if consumed they aren't going out the exhaust unburned!

Just a bit of correction here. In the mid 50's (1955) Chevy introduced the 265 V8. It was 1957 when the 283 Fuel Injected Engine appeared (283 ci/283 HP) and it was indeed mechanical. The 327 appeared later and the same mechanical fuel injection was available.

 

[Chris1956]

OK, let me go farther. The ME-109 fighter aircraft from WWII had a V12 fuel injected motor.

The best the Brits and Americans had were carb engines. A lady in Britain needed to invent a way to help the carbs work in low G turns, dives, inverted flight etc. Luckily she invented an "orafice" that kept the carbs working .

Miss Shilling's orifice - Wikipedia

en.wikipedia.org

 

[racerone]

Lawn Boy power mowers built by OMC ( Johnson / Evinrude ) were loop charged in the 1950's