On Aug 20, 10:41 am, Bob wrote:

Yep, they used to be pretty common main engines in small workboats and
utility craft, now mostly used for deck engines and gen sets. The
marine engine configuration produces just over 100 hp naturally
aspirated.

Bob-

Bob, by searching around the typical listings on a naturally aspirated
3-53 is about 75 hp. Which I feel is more realistic. I could be
wrong, though.

http://www.usedboats.com/index.php?s...istoryback =1

"Tim" wrote in message
ps.com...
On Aug 20, 10:41 am, Bob wrote:

Yep, they used to be pretty common main engines in small workboats and
utility craft, now mostly used for deck engines and gen sets. The
marine engine configuration produces just over 100 hp naturally
aspirated.

Bob-

Bob, by searching around the typical listings on a naturally aspirated
3-53 is about 75 hp. Which I feel is more realistic. I could be
wrong, though.

http://www.usedboats.com/index.php?s...istoryback =1


http://www.adieselengine.com/new_page_1.htm
shows 101 hp for the 3-53 and 175 for the 3-53T And since it shows a T I
would assume turbocharged. As the 6-71 with a blower was a 6V-71. the same
blower that was used for years on dragsters and driven via a Gilmer belt.

On Aug 20, 11:03 pm, "Calif Bill" wrote:
"Tim" wrote in message

ps.com...

On Aug 20, 10:41 am, Bob wrote:

Yep, they used to be pretty common main engines in small workboats and
utility craft, now mostly used for deck engines and gen sets. The
marine engine configuration produces just over 100 hp naturally
aspirated.

Bob-

Bob, by searching around the typical listings on a naturally aspirated
3-53 is about 75 hp. Which I feel is more realistic. I could be
wrong, though.

http://www.usedboats.com/index.php?s...om§ion=search&....

http://www.adieselengine.com/new_page_1.htm
shows 101 hp for the 3-53 and 175 for the 3-53T And since it shows a T I
would assume turbocharged. As the 6-71 with a blower was a 6V-71. the same
blower that was used for years on dragsters and driven via a Gilmer belt.

Oh OK, I see they're pushing it up to 2800 rpm, instead of the
customary 2100 max. That might be the clue to the 100 hp.

Calif Bill wrote:
"Tim" wrote in message
ps.com...
On Aug 20, 10:41 am, Bob wrote:

Yep, they used to be pretty common main engines in small workboats and
utility craft, now mostly used for deck engines and gen sets. The
marine engine configuration produces just over 100 hp naturally
aspirated.

Bob-
Bob, by searching around the typical listings on a naturally aspirated
3-53 is about 75 hp. Which I feel is more realistic. I could be
wrong, though.

http://www.usedboats.com/index.php?s...istoryback =1


http://www.adieselengine.com/new_page_1.htm
shows 101 hp for the 3-53 and 175 for the 3-53T And since it shows a T I
would assume turbocharged. As the 6-71 with a blower was a 6V-71. the same
blower that was used for years on dragsters and driven via a Gilmer belt.


All two-stroke Detroits have a blower. It's necessary to the operation
of the engine, does the job that crankcase pressure does in a little
two-stroke. On the inline motors it mounts on the side of the block.

John

"JohnM" wrote in message
m...


All two-stroke Detroits have a blower. It's necessary to the operation of
the engine, does the job that crankcase pressure does in a little
two-stroke. On the inline motors it mounts on the side of the block.

John

If a "blower" is defined by you as a turbo (i.e. .., device to increase air
flow into the cylinders), then you are in error. I know several people with
2 stroke DD 6-71's. Some are naturally aspirated, some have turbos
(blowers).

Eisboch

Eisboch wrote:

"JohnM" wrote in message
m...


All two-stroke Detroits have a blower. It's necessary to the operation of
the engine, does the job that crankcase pressure does in a little
two-stroke. On the inline motors it mounts on the side of the block.

John

If a "blower" is defined by you as a turbo (i.e. .., device to increase air
flow into the cylinders), then you are in error. I know several people with
2 stroke DD 6-71's. Some are naturally aspirated, some have turbos
(blowers).

Eisboch

A "blower" generally refers to a direct driven super charger, not an
exhaust driven turbo charger.

On Wed, 22 Aug 2007 12:27:55 GMT, "Pete C."
wrote:

Eisboch wrote:

"JohnM" wrote in message
m...


All two-stroke Detroits have a blower. It's necessary to the operation of
the engine, does the job that crankcase pressure does in a little
two-stroke. On the inline motors it mounts on the side of the block.

John

If a "blower" is defined by you as a turbo (i.e. .., device to increase air
flow into the cylinders), then you are in error. I know several people with
2 stroke DD 6-71's. Some are naturally aspirated, some have turbos
(blowers).

Eisboch

A "blower" generally refers to a direct driven super charger, not an
exhaust driven turbo charger.

The Detroit Diesel is a two stroke, diesel. The piston goes down on
the power stroke and comes up on the compression stroke. Without the
mechanical driven "blower" which simply blows air in through the
cylinder ports and through the exhaust ports at the beginning of the
compression stroke there would be no way to get a charge of air into
the engine.

If you wanted to increase the pressure and volume of this air flow you
could add a exhaust driven compressor before the "blower", But you
must have the "blower" for the engine to run.


Bruce in Bangkok
(brucepaigeATgmailDOTcom)

wrote in message
...
On Wed, 22 Aug 2007 12:27:55 GMT, "Pete C."
wrote:

Eisboch wrote:

"JohnM" wrote in message
m...


All two-stroke Detroits have a blower. It's necessary to the operation
of
the engine, does the job that crankcase pressure does in a little
two-stroke. On the inline motors it mounts on the side of the block.

John

If a "blower" is defined by you as a turbo (i.e. .., device to increase
air
flow into the cylinders), then you are in error. I know several people
with
2 stroke DD 6-71's. Some are naturally aspirated, some have turbos
(blowers).

Eisboch

A "blower" generally refers to a direct driven super charger, not an
exhaust driven turbo charger.

The Detroit Diesel is a two stroke, diesel. The piston goes down on
the power stroke and comes up on the compression stroke. Without the
mechanical driven "blower" which simply blows air in through the
cylinder ports and through the exhaust ports at the beginning of the
compression stroke there would be no way to get a charge of air into
the engine.

If you wanted to increase the pressure and volume of this air flow you
could add a exhaust driven compressor before the "blower", But you
must have the "blower" for the engine to run.


Bruce in Bangkok
(brucepaigeATgmailDOTcom)


Gotcha. I was confusing "blower" with turbocharger as Pete C. pointed out.

Eisboch

On Wed, 22 Aug 2007 21:05:57 +0700, wrote:

On Wed, 22 Aug 2007 12:27:55 GMT, "Pete C."
wrote:

Eisboch wrote:

"JohnM" wrote in message
m...


All two-stroke Detroits have a blower. It's necessary to the operation of
the engine, does the job that crankcase pressure does in a little
two-stroke. On the inline motors it mounts on the side of the block.

John

If a "blower" is defined by you as a turbo (i.e. .., device to increase air
flow into the cylinders), then you are in error. I know several people with
2 stroke DD 6-71's. Some are naturally aspirated, some have turbos
(blowers).

Eisboch

A "blower" generally refers to a direct driven super charger, not an
exhaust driven turbo charger.

The Detroit Diesel is a two stroke, diesel. The piston goes down on
the power stroke and comes up on the compression stroke. Without the
mechanical driven "blower" which simply blows air in through the
cylinder ports and through the exhaust ports at the beginning of the
compression stroke there would be no way to get a charge of air into
the engine.

If you wanted to increase the pressure and volume of this air flow you
could add a exhaust driven compressor before the "blower", But you
must have the "blower" for the engine to run.


Bruce in Bangkok
(brucepaigeATgmailDOTcom)

Neither being a two-stroke nor using diesel oil (nor indeed the
combination) requires a blower/turbo for such an engine to operate. It is
true that engines can be designed so that, were the blower/turbo with which
they are normally equipped to be removed they would not run, that would be
due to other design decisions, not to the choice of fuel, method of
ignition, and/or two/four-stroke operation.

wrote in message
...
On Wed, 22 Aug 2007 12:27:55 GMT, "Pete C."
wrote:

Eisboch wrote:

"JohnM" wrote in message
m...


All two-stroke Detroits have a blower. It's necessary to the operation
of
the engine, does the job that crankcase pressure does in a little
two-stroke. On the inline motors it mounts on the side of the block.

John

If a "blower" is defined by you as a turbo (i.e. .., device to increase
air
flow into the cylinders), then you are in error. I know several people
with
2 stroke DD 6-71's. Some are naturally aspirated, some have turbos
(blowers).

Eisboch

A "blower" generally refers to a direct driven super charger, not an
exhaust driven turbo charger.

The Detroit Diesel is a two stroke, diesel. The piston goes down on
the power stroke and comes up on the compression stroke. Without the
mechanical driven "blower" which simply blows air in through the
cylinder ports and through the exhaust ports at the beginning of the
compression stroke there would be no way to get a charge of air into
the engine.

If you wanted to increase the pressure and volume of this air flow you
could add a exhaust driven compressor before the "blower", But you
must have the "blower" for the engine to run.


Bruce in Bangkok
(brucepaigeATgmailDOTcom)

On large stationary diesel generators using Detroit diesels, there a often
both shaft driven " blowers" and turbochargers.
The blowers are used to start the engine and get it up to speed.
Afterwards, the blowers are cut off by damper valves and the turbochargers
take over the air supply job. This is done because the overall engine
efficiency is better using the turbochargers.

Randy