355D 18 vs 20HP
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    355D 18 vs 20HP

    I know this is a long shot but does anyone know what was done to the engine to raise the HP from 18 to 20? The GX355 uses the exact engine as the 355D and got an extra 2 HP....Im looking to get 20HP from my 355D. I know the Rev limit went from 3K to 3600 so maybe that is it? Anyone have any thoughts or ideas for me? The extra RPM / HP would be nice when blowing snow or mulching leaves /wet grass.

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    Where are you seeing the difference in specifications? TractorData shows both the GX355 and GX355D has having 18HP with a Yanmar 2V78 engine. Both are shown with the same bore & stroke (3.07x3.09) but the GX355 is shown as having a compression ratio of 22:1 and the GX355D as 23:1.
    2012 2720 -- 200CX Loader -- 54" Quick Attach Snow Blower -- Frontier LR5060 Rake -- Land Pride RB1660 Blade (Hydraulic Angle) -- Artillian 42" Forks -- Ken's Bolt on Grab Hooks -- Fit Rite Hydraulic top-link -- 2013 X500 for mowing duties

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    Quote Originally Posted by jgayman View Post
    Where are you seeing the difference in specifications? TractorData shows both the GX355 and GX355D has having 18HP with a Yanmar 2V78 engine. Both are shown with the same bore & stroke (3.07x3.09) but the GX355 is shown as having a compression ratio of 22:1 and the GX355D as 23:1.
    I was mistaken, I was referencing the Yanmar spec sheet... Was wondering what was different other than a bump in RPM.

    Spec Sheet

    Yanmar 2V78 Diesel Engine

    Rated Speed Output Hp Output kW

    2800 rpm 16.1 12
    3000 rpm 17.2 12.8
    3200 rpm 18.1 13.5
    3400 rpm 19 14.2
    3600 rpm 20 14.9

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    jgayman's Avatar
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    Quote Originally Posted by CK355D View Post
    I was mistaken, I was referencing the Yanmar spec sheet... Was wondering what was different other than a bump in RPM.
    I'm not a diesel expert but there are all kinds of things manufacturers can tweak on diesel engines to adjust the HP but I suspect the 2HP difference is RPM. Check out the Yanmar website and compare small engines of the same displacement. You can find HP ranges from 11 to 22 HP from the same engine running at different RPMs.
    2012 2720 -- 200CX Loader -- 54" Quick Attach Snow Blower -- Frontier LR5060 Rake -- Land Pride RB1660 Blade (Hydraulic Angle) -- Artillian 42" Forks -- Ken's Bolt on Grab Hooks -- Fit Rite Hydraulic top-link -- 2013 X500 for mowing duties

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    I would look at JDparts to see if the rods, pistons, heads, valves, cam or injectors have different part numbers. If they all match up you might be able to just adjust your max rpm. If there are different parts I’d investigate further to see if the 18hp isn’t built to handle 3600 rpm.

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    Quote Originally Posted by rydplrs View Post
    I would look at JDparts to see if the rods, pistons, heads, valves, cam or injectors have different part numbers. If they all match up you might be able to just adjust your max rpm. If there are different parts I’d investigate further to see if the 18hp isn’t built to handle 3600 rpm.
    A Google search turned up a snippet from back when Yanmar first introduced the 2V78 engine.

    Yanmar has developed a new twin-cylinder diesel engine. The 2V78V vertical shaft engine was introduced to North America at the recent OPEI Lawn & Garden Expo '97 in Louisville, Ky., by Yanmar Diesel America Corp. and is available in ratings from 16.1 to 20 hp at operating speeds from 2800 to 3600 rpm

    2012 2720 -- 200CX Loader -- 54" Quick Attach Snow Blower -- Frontier LR5060 Rake -- Land Pride RB1660 Blade (Hydraulic Angle) -- Artillian 42" Forks -- Ken's Bolt on Grab Hooks -- Fit Rite Hydraulic top-link -- 2013 X500 for mowing duties

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    If I am not mistaken,, a snow blower needs torque,, not horsepower,

    and,,,

    max torque is usually at a MUCH lower than maximum RPM,, for either engine.

    Compare the torque specs,,

    Kohler offered a 16HP and 18HP engine for garden tractors back when,,

    The difference was the 16HP did not have an oil filter, the 18HP had a screw on oil filter,,
    literally, that was the only difference,

    I think they can make the engines spec to whatever brings in the most $$$$$$
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    Ill keep digging. Its an older somewhat uncommon engine so info is sometimes difficult to get. I called Yanmar and they wouldn't talk to me and told me to call Deere.

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    Quote Originally Posted by CADplans View Post
    Kohler offered a 16HP and 18HP engine for garden tractors back when,,

    The difference was the 16HP did not have an oil filter, the 18HP had a screw on oil filter,,
    literally, that was the only difference,

    I think they can make the engines spec to whatever brings in the most $$$$$$
    I think you are right. Did you ever take note of the low-end gear driven riding mowers? They are made by MTD and sold under a dozen different brands and usually differ only in color. They all typically have oil filter-less B&S engines that look identical with stickers that read 14.5, 15.5, 17.5 and 19HP. I find it hard to believe that B&S actually produced that many different identical engines which were 1HP apart. :-)
    2012 2720 -- 200CX Loader -- 54" Quick Attach Snow Blower -- Frontier LR5060 Rake -- Land Pride RB1660 Blade (Hydraulic Angle) -- Artillian 42" Forks -- Ken's Bolt on Grab Hooks -- Fit Rite Hydraulic top-link -- 2013 X500 for mowing duties

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    jgayman's Avatar
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    Quote Originally Posted by CK355D View Post
    Ill keep digging. Its an older somewhat uncommon engine so info is sometimes difficult to get. I called Yanmar and they wouldn't talk to me and told me to call Deere.
    Not surprising, a search of 2V78 on the Yanmar website returns nothing.

    You can review the exploded parts illustrations on the JD website.

    Just for kicks I looked up JD part number for the head assys for the engines in the GX355 and 355D and the engines use the same pair of heads (AM880598 & AM880599).
    2012 2720 -- 200CX Loader -- 54" Quick Attach Snow Blower -- Frontier LR5060 Rake -- Land Pride RB1660 Blade (Hydraulic Angle) -- Artillian 42" Forks -- Ken's Bolt on Grab Hooks -- Fit Rite Hydraulic top-link -- 2013 X500 for mowing duties

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