Packard Marine Engine 1M-356

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Packard Marine Engine 1M-356

Postby Fourpack » Mon May 31, 2010 11:17 am

Here is the four-page brochure on the 1M-356 engine. The 1M-356 shared most reciprocating parts with the 356 automobile engine (1940-50). It could be had with direct drive with 1 to 1 ratio and reduction gear units of Packard design in ratios of 1.45 to 1, 2.04 to 1, 2:52 to 1 and 3:55 to 1, the last intended for use in work boat installations. It was offered with right and left hand rotation. Approximately 1,525 of these engines were sold between 1947 and 1951. The 1M-356 was equipped with an updraft Stromberg SFM-5 carburetor with a Zenith back-fire arrester and special sealed marine Autolite 6V electrical equipment, with 12V equipment offered as a $20.00 option. Sea water was circulated through the engine by a special marine bronze water pump made by Sherwood Brass Works. It was driven by a gear that was attached to the front of the big timing gear. The price of a 1M-356 engine with 2:04 reduction gear ratio was $1,130.00 f.o.b. Detroit.
The pictures show a 1M-245 and a 1M-356 engine now on display at America's Packard Museum in Dayton, Ohio.
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Last edited by Fourpack on Tue Jun 01, 2010 5:43 pm, edited 1 time in total.
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Re: 1M-356 Packard Martine Engine

Postby John Harley » Tue Jun 01, 2010 3:06 pm


Why updraft carbs so late in the game?


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Re: 1M-356 Packard Martine Engine

Postby Dave Czirr » Tue Jun 01, 2010 5:06 pm

Limits on depth of hull and deck height, updraft saves about a foot of headroom.
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Re: 1M-356 Packard Martine Engine

Postby Adam » Wed Jun 02, 2010 12:22 am

You might consider that an updraft is less prone to flooding, since the excess petrol runs out onto the floor. But then it forms a dangerous plume of vapour in the bottom of the hull. :shock:

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Re: Packard Marine Engine 1M-356

Postby JD in KC » Wed Jun 02, 2010 6:22 am

My 356 downdrafts, when flooded, send the excess petrol down a tube from the intake manifold and dumps it on ... the floor.
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