E-TEC G1 vs G2 250 HO on 23' Boat - Moderated Discussion Areas

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   E-TEC G1 vs G2 250 HO on 23' Boat

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Author Topic:   E-TEC G1 vs G2 250 HO on 23' Boat

seahorse posted 07-24-2014 10:21 AM ET (US)
Here is a new discussion giving initial results of a re-power with the new G2 engine. The same prop was used in both tests. This was the first run and other props or heights were not played with at this time.
G1 vs. G2 250 HO Comparison on Same 23' Boat
Initial comparison with same propeller – 23-pitch Rebel
Average of two runs - engines tested on different days
You can see the fuel savings difference at cruise and at WOT with the new G2
Note the fuel load difference

G1
idle – 2.8 mph – 0.2 gph – 13.8 mpg
cruise – 33.6 mph –12.4 gph – 2.7 mpg
WOT – 60.4 mph – 26.2 gph - 2.3 mpg
Acceleration – 5.0 seconds
Fuel aboard – 48 gallons
G2
idle -- 2.5 mph – 0.2 gph -- 12.3 mpg
cruise – 33.2 mph – 9.8 gph – 3.4 mpg
WOT -- 60 .3 mph – 22.8 gph – 2.6 mpg
Acceleration – 3.7 seconds
Fuel aboard – 72 gallons

Jefecinco posted 07-24-2014 10:42 AM ET (US)
Pretty amazing difference in efficiency and time to plane particularly given the much heavier fuel load.
At approximately 25% better economy at cruising speed a commercial vessel should realize a significantly better return on investment.
Evinrude appears to have changed the game.
Butch
Peter posted 07-24-2014 10:49 AM ET (US)
Wow. That is a significant improvement.
Dave Sutton posted 07-24-2014 11:01 AM ET (US)
Nice data. Keep it coming!

Dave
.
kwik_wurk posted 07-24-2014 07:13 PM ET (US)
Hate to be a boo bird, but the differences are rather stunning, almost too good to be true. 25% mpg gain at cruise implies, the G1 was a dog (which could be to age), G2 is a engineering marvel, or the data has some explaining to do. -- What are the RPM's of the test points. I would expect improvements in the single digits.
Teak Oil posted 07-25-2014 10:15 PM ET (US)
12 gph for the G1 seems pretty high at 33 mph, my G1 300 cruises a 22' boat at 33 mph and about 3600 rpm at under 10 gph routinely
jimh posted 07-26-2014 05:36 AM ET (US)
The E-TEC G2 appears to provide a very significant improvement in fuel economy at the mid-range cruising speed. Cruising speed fuel economy is import to me. That is the engine operating condition where my boat consumes most of its fuel. If there is a significant improvement at cruising speed fuel economy, it will have a very significant improvement in overall boat fuel economy.
Mambo Minnow posted 07-26-2014 09:03 AM ET (US)
The improvement in fuel efficiency is not surprising to me, as reviews I have read of side to side brand comparisons usually ranked Evinrude last in fuel efficiency. There was always room for improvement.
How does this compare to a four stroke's fuel efficiency?
jimh posted 07-26-2014 09:52 AM ET (US)
The comparisons I have seen showed that the E-TEC (not G2) was already much better in fuel economy at idle speeds than four-stroke outboard engines, often by a factor of two. This is due to the stratified charge method used. My E-TEC (not G2) gets amazing fuel economy at low-throttle speeds. The only place a four-stroke outboard engine such as the HONDA lean-burn engines had an advantage in fuel economy was at mid-range cruise. The HONDA outboards in particular seem to be able to deliver really good fuel economy at cruising speeds. I attribute that to their automobile heritage, where fuel economy is absolutely necessary for survival.
Most of the head-to-head engine fuel economy comparisons provided by manufacturers tend to pick selected operating points where they can find an advantage over competitors' performance. Usually the variation is on the order of a few percent. I don't think anyone is going to base their choice of engine for a re-power completely on fuel economy, unless they are someone who runs 1,000-hours per year and lives where fuel is $9-gallon.
The best comparison of fuel economy among outboard engines is to look at the average fuel burn in GPH over an ICOMIA operating cycle.

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Author	Topic: E-TEC G1 vs G2 250 HO on 23' Boat
seahorse	posted 07-24-2014 10:21 AM ET (US) Here is a new discussion giving initial results of a re-power with the new G2 engine. The same prop was used in both tests. This was the first run and other props or heights were not played with at this time. G1 vs. G2 250 HO Comparison on Same 23' Boat Initial comparison with same propeller – 23-pitch Rebel Average of two runs - engines tested on different days You can see the fuel savings difference at cruise and at WOT with the new G2 Note the fuel load difference G1 idle – 2.8 mph – 0.2 gph – 13.8 mpg cruise – 33.6 mph –12.4 gph – 2.7 mpg WOT – 60.4 mph – 26.2 gph - 2.3 mpg Acceleration – 5.0 seconds Fuel aboard – 48 gallons G2 idle -- 2.5 mph – 0.2 gph -- 12.3 mpg cruise – 33.2 mph – 9.8 gph – 3.4 mpg WOT -- 60 .3 mph – 22.8 gph – 2.6 mpg Acceleration – 3.7 seconds Fuel aboard – 72 gallons
Jefecinco	posted 07-24-2014 10:42 AM ET (US) Pretty amazing difference in efficiency and time to plane particularly given the much heavier fuel load. At approximately 25% better economy at cruising speed a commercial vessel should realize a significantly better return on investment. Evinrude appears to have changed the game. Butch
Peter	posted 07-24-2014 10:49 AM ET (US) Wow. That is a significant improvement.
Dave Sutton	posted 07-24-2014 11:01 AM ET (US) Nice data. Keep it coming! Dave .
kwik_wurk	posted 07-24-2014 07:13 PM ET (US) Hate to be a boo bird, but the differences are rather stunning, almost too good to be true. 25% mpg gain at cruise implies, the G1 was a dog (which could be to age), G2 is a engineering marvel, or the data has some explaining to do. -- What are the RPM's of the test points. I would expect improvements in the single digits.
Teak Oil	posted 07-25-2014 10:15 PM ET (US) 12 gph for the G1 seems pretty high at 33 mph, my G1 300 cruises a 22' boat at 33 mph and about 3600 rpm at under 10 gph routinely
jimh	posted 07-26-2014 05:36 AM ET (US) The E-TEC G2 appears to provide a very significant improvement in fuel economy at the mid-range cruising speed. Cruising speed fuel economy is import to me. That is the engine operating condition where my boat consumes most of its fuel. If there is a significant improvement at cruising speed fuel economy, it will have a very significant improvement in overall boat fuel economy.
Mambo Minnow	posted 07-26-2014 09:03 AM ET (US) The improvement in fuel efficiency is not surprising to me, as reviews I have read of side to side brand comparisons usually ranked Evinrude last in fuel efficiency. There was always room for improvement. How does this compare to a four stroke's fuel efficiency?
jimh	posted 07-26-2014 09:52 AM ET (US) The comparisons I have seen showed that the E-TEC (not G2) was already much better in fuel economy at idle speeds than four-stroke outboard engines, often by a factor of two. This is due to the stratified charge method used. My E-TEC (not G2) gets amazing fuel economy at low-throttle speeds. The only place a four-stroke outboard engine such as the HONDA lean-burn engines had an advantage in fuel economy was at mid-range cruise. The HONDA outboards in particular seem to be able to deliver really good fuel economy at cruising speeds. I attribute that to their automobile heritage, where fuel economy is absolutely necessary for survival. Most of the head-to-head engine fuel economy comparisons provided by manufacturers tend to pick selected operating points where they can find an advantage over competitors' performance. Usually the variation is on the order of a few percent. I don't think anyone is going to base their choice of engine for a re-power completely on fuel economy, unless they are someone who runs 1,000-hours per year and lives where fuel is $9-gallon. The best comparison of fuel economy among outboard engines is to look at the average fuel burn in GPH over an ICOMIA operating cycle.