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Got the engine and it is not a 4-165

Old Marine Engine » Gray Marine Gas Engines - 4, 6, and 8 cylinder » Got the engine and it is not a 4-165 « Previous Next »

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MichaelRidout
Visitor
Posted on Tuesday, May 10, 2005 - 05:33 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

The yellow tag riveted to the flywheel shroud says:
Model: 4-85 Engine #: M7701

Cast into the block is CWC

Cast into the head is F400A467

Unfortunately the carb is missing and the mounting neck and flange on the underside of the intake manifold is broken off and gone too. That means I am in the market for a new manifold.

So can I get some displacement, power and RPM specs and years on this one?

Mick Ridout
m.ridout@worldnet.att.net
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andrew
Moderator
Username: andrew

Post Number: 1147
Registered: 11-2001


Posted on Tuesday, May 10, 2005 - 06:20 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

Michael,

The Gray Marine model Four-85:
  • 4 cylinders
  • 3-7/16" x 4-3/8"
  • 162 cubic inch
  • 75HP @ 3600 rpm
  • 85HP @ 4000 rpm
  • 540 lbs direct drive
  • Spark plugs D-14 .025" gap

I don't know the year... 1959 to 1965 maybe...
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MichaelRidout
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Posted on Tuesday, May 10, 2005 - 07:05 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

Thanks for the info.

I can't tell what carburetor will be needed on this. I am not worried about power. I will be happy with 50 hp. Actually I would be happy with 1800 max rpms too. According to my plans, a 16dX16p prop is recommeded. A luggar would probably work better. Do you suppose that I can use a smaller carb and/or just put a throttle stop on the carb I use to limit the revs?
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gannet
New member
Username: gannet

Post Number: 3
Registered: 04-2005
Posted on Tuesday, May 10, 2005 - 07:38 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

Michael
Could you tell us a little bit about the boat.
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MichaelRidout
Visitor
Posted on Tuesday, May 10, 2005 - 08:53 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

It is a 1924 George Crouch design, Grayling Jr. It is 24' long with a 6'beam. No more than a couple feet of draft and a couple feet of freeboard. Not sure what it will weight, but I plan to calculate it. It has a round bottom, no hard chine and no skeg.

With a Gray Marine Model Z, whatever that is, he said it would do 15 to 17 mph. With an engine of 50 hp and no more that 600 lbs it will do 25 to 27. All this with a 16"X16pitch three blade prop.

He described it as a summer house boat that one could feel safe to let the kids take across the lake even if the weather blew up a little.

Mick Ridout
m.ridout@worldnet.att.net
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Frank Columbia
Member
Username: frankco

Post Number: 19
Registered: 02-2005
Posted on Wednesday, January 11, 2006 - 04:02 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

I have a graymarine 100 which uses a 1:1 capitol transmission can someone tell me if it uses a right or left heand prop? The booklet I have on it recommends a 13x13 prop but I have a left hand prop much smaller in diameter but looks to be at a greater pitch which was used behind a chris craft model k motor 85 hp. it will be used in a 1941 chris craft deluxe barrelback 17' which doesn't have room for a 13" prop. Is there a conversion for increasing pitch to offset a larger prop?
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Bruce Hall
Senior Member
Username: bruce

Post Number: 300
Registered: 07-2002
Posted on Wednesday, January 11, 2006 - 11:52 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

Frank, My 1950 Gray Model 100 manual gives two prop sizes listed for the 226 CI express 6 cyl which I guess are the range of variable combinations. They are 13x12 and 14x10. Seems to me that a 95 Hp K Chris prop on a 17' hull is around a 12x12 to a 12x14. Pretty good bet your Model 100 uses a right hand prop.Firing order for right hand turning engine is 1-5-3-6-2-4 Opposite rotation is 1-4-2-6-3-5 Trial and error getting the engine to the peak recomended top RPM of 3200 under load and soaked up is the goal but I feel more comfortable with the 2800-3000 rpm range myself at full throttle.Maintain an at least an inch clearence between the prop and the bottom to avoid plank erosion over top of the prop.
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Visitor
Posted on Monday, March 06, 2006 - 04:56 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

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