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Chrysler crown M47 Good RPM

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shawnstam
New member
Username: shawnstam

Post Number: 1
Registered: 10-2005
Posted on Thursday, December 08, 2005 - 11:27 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

I own a old 25 foot boat planeing hull, I run my engine anywhere from 2900 rpm to 3200 rpm. Does this seem to high for one of these engines. Has anybody had any experince with one of these engines in the past or present. Is this Rpm to high for it, and am I going to hurt something sooner or later
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Mark Thompson
Visitor
Posted on Thursday, January 05, 2006 - 10:53 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

Some old-timers I know that have run Crowns for 50 years swear by 2700- 3200 is a a little high maybe, but you can always play with your prop pitch to slow it down a bit- like another old guy said, "Run it!!"
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miro
Senior Member
Username: miro

Post Number: 201
Registered: 11-2001
Posted on Friday, January 06, 2006 - 02:01 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

I found that anything over about 2800 rpm on these toque-y engines isn't good. You'll end up with burned exhaust valves.
I agee that 3200 is a bit much
miro
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yachtspecco
Visitor
Posted on Wednesday, February 15, 2006 - 11:13 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

As with all marine engines it depends on how heavily you are loading it at that rpm. If you are running a small pitch prop and it will turn much faster wide open you may be alright at that rpm. Rule of thumb for planing hull with an old L head is maximum cruising rpm should be no more than 75% of wide open throttle rpm at your given load. Obviously the load can change depending on people aboard and gear that day.
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shawnstam
New member
Username: shawnstam

Post Number: 2
Registered: 10-2005
Posted on Monday, March 20, 2006 - 09:05 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

Thanks guys, I have been toying around for a while and there is not much of a speed diff between 2700 3200 rpm, and 2700 is about 75% of max rpm. So I will run this engine an 2700 rpm and see what is looks like when I tear it down for service. once again thanks.
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eli_ellis
New member
Username: eli_ellis

Post Number: 1
Registered: 06-2006
Posted on Friday, June 23, 2006 - 09:30 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

Looking for a set of impellers (gears) for a water pump on a chrysler crown. 2 inch o.d. gear, 5/8 shaft, part # 7.50.12

I would very much appreciate any help!!

Thanks,
Eli Ellis

eli@midcoast.com
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Bill Bayne
Visitor
Posted on Saturday, August 19, 2006 - 08:18 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

I am looking for a water pump for a 1949 Chrysler Crown M-47.
Jabsco originally manufactured. All help deeply appreciated.
Bill Bayne
bill@coyotefilms.net
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chip
New member
Username: chip

Post Number: 1
Registered: 09-2006
Posted on Wednesday, September 13, 2006 - 10:12 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

I HAVE HEARD THAT, IN THE VERY FINAL PRODUCTION OF THE CHRYSLER CROWNS, AN ADAPTATION WAS MADE TO FIT AN ALTERNATOR IN PLACE OF THE THE GEAR DRIVEN GENERATOR. ANYONE EVER SEEN THIS SETUP. ANY IDEA WHERE TO FIND ONE?
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shawnstam
Member
Username: shawnstam

Post Number: 20
Registered: 10-2005
Posted on Sunday, December 02, 2007 - 11:49 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

just leave the wore out one in the hole and add another to the back of the engine. There are many jabso pedistal pumps that can be mounted that way.
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mattd
Member
Username: mattd

Post Number: 6
Registered: 05-2006
Posted on Wednesday, December 05, 2007 - 04:52 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

I have a complete matched pair of counter-rotating crown engines (with transmissions) out of an old 40's-era Richardson. They are sitting in my garage in the Seattle area.

Free to a good home (hopefully with someone who has the time to clean them up).

I'm moving and I'm out of time on this project. They have to go in the next 3 weeks or they will find their way to the local wrecking yard.

I'mot interested in parting them out, but all the parts are there, including the original Zenith carbs which alone could justify the effort of picking up the pair.

Call me or email if you want them.

Matt
425-445-6433

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