Bill, I have a friend with a new Chevy truck with the shut down system. Yes, at 75 cruise on, he said he's getting about 28 mpg.

I remember in the early 80's the Caddilacs had that 8-6-4 system that when it worked it did well. But it didn't work very well for long. A lot of them caught on fire...

wrote:
On Tue, 19 May 2015 05:24:54 +0100, wenders
wrote:

If I shut down one of my engines to save fuel, am I supposed to block
the shaft of the dead engine in order to protect the transmission? And
what is the best way to do this?
Dunno much about inboards but the outboard guys say you really should
swap props if you are running on one engine to prevent "lugging". If
it was properly propped to run 2 in the power band, one is going to be
straining at much more than hull speed.


Most twins have counter-rotating props. Swapping them would make you
run in reverse.

True North wrote:
On Wednesday, 20 May 2015 09:19:06 UTC-3, Tim wrote:
Maybe I'm not thinking right, but how can running only 1engine save fuel? To achieve any speed to get to plane arnt you having to over tax that one engine, causing higher fuel consumption?
Reminds me of those vehicles that shut down half the cylinders when cruising. I wouldn't touch one of those vehicles...it's quite hilly here in the city and the province in general.


People much smarter than you have accounted for your concerns when they
developed those systems.

On Wednesday, May 20, 2015 at 8:05:11 PM UTC-4, Username wrote:

People much smarter than you have accounted for your concerns when they
developed those systems.

****face krause has been " running on one engine" for years right here.

On Wed, 20 May 2015 20:03:00 -0400, Username
wrote:

wrote:
On Tue, 19 May 2015 05:24:54 +0100, wenders
wrote:

If I shut down one of my engines to save fuel, am I supposed to block
the shaft of the dead engine in order to protect the transmission? And
what is the best way to do this?
Dunno much about inboards but the outboard guys say you really should
swap props if you are running on one engine to prevent "lugging". If
it was properly propped to run 2 in the power band, one is going to be
straining at much more than hull speed.


Most twins have counter-rotating props. Swapping them would make you
run in reverse.

===

I think you misunderstood his comment. He did not mean swapping them
port to starboard and vice versa. He meant swapping them for new
props with a lower pitch, sort of like shifting to a lower gear.

Username wrote:
wrote:
On Tue, 19 May 2015 05:24:54 +0100, wenders
wrote:

If I shut down one of my engines to save fuel, am I supposed to block
the shaft of the dead engine in order to protect the transmission? And
what is the best way to do this?
Dunno much about inboards but the outboard guys say you really should
swap props if you are running on one engine to prevent "lugging". If
it was properly propped to run 2 in the power band, one is going to be
straining at much more than hull speed.


Most twins have counter-rotating props. Swapping them would make you run in reverse.

He is referring to size, not side to side.

Tim wrote:
Bill, I have a friend with a new Chevy truck with the shut down system.
Yes, at 75 cruise on, he said he's getting about 28 mpg.

I remember in the early 80's the Caddilacs had that 8-6-4 system that
when it worked it did well. But it didn't work very well for long. A lot
of them caught on fire...

Lots more computer power in cars these days.

I can understand running one engine for a 'trolling' speed. But the OP was vague on what boat, engines, and purpose he's trying to achieve besides merely 'saving fuel'

He hasn't been back either. Lol!

On 5/21/15 9:22 AM, Tim wrote:
I can understand running one engine for a 'trolling' speed. But the OP was vague on what boat, engines, and purpose he's trying to achieve besides merely 'saving fuel'

He hasn't been back either. Lol!


A friend has a 25 foot outboard fishing boat with a full transom
bracket. It has a 300 hp Yamaha centered on the platform, and there's a
20 hp outboard mounted on the bracket to the side of the big Yamaha.
Steering bracket connects both to the steering wheels. Nothing unusual
around here. He runs in and out of the harbor on the small outboard, and
also uses it to troll for stripers. The small outboard has no problems
maintaining the 6 mph harbor speed limit.

On 5/21/2015 9:22 AM, Tim wrote:
I can understand running one engine for a 'trolling' speed. But the OP was vague on what boat, engines, and purpose he's trying to achieve besides merely 'saving fuel'

He hasn't been back either. Lol!


Mebee we've been trolled ;-)

--

Respectfully submitted by Justan

Laugh of the day from Krause

"I'm not to blame anymore for the atmosphere in here.
I've been "born again" as a nice guy."