BoatBanter.com - View Single Post - Detroit 353 diesel -- aluminum block? How to tell?

Wayne.B

On Wed, 22 Aug 2007 11:29:44 -0500, lid wrote:

On Wed, 22 Aug 07, jtay wrote:
Neither being a two-stroke nor using diesel oil (nor indeed the
combination) requires a blower/turbo for such an engine to operate.

Running a Detroit 4-53 without a blower (and maybe all Detroit 2
strokes -shrug- I dunno) would indeed take a complete and major league
re-design. Not just a few bolt on changes for sure.

Absolutely right. The Detroit 2 stroke design requires a blower to
move new air into the piston and purge the ehaust gases. It will not
run without it, and little or no increase in volumetric efficiency is
achieved. A turbo charger on the other hand is designed to increase
the air charge to the piston above atmospheric pressure, and therefore
horsepower is increased as the effective cylinder volume is increased.

The confusion arises from the fact that a Detroit blower can also be
used on a gasoline engine as a supercharger. Same basic device but a
different purpose and result.