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Crusader won't break 2100 RPM's

GAS engine, transmission and generator repair and maintenance discussion forum.
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Jab
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Vessel Info: 1978 Santa Cruz 2866
Moosehead Lake, Maine

Crusader won't break 2100 RPM's

Postby Jab » July 5th, 2014, 3:17 pm

The Crusader engine in my '78 Santa Cruz 2866 won't break 2100 RPM.

The good news- I don't need it to. We use the boat mostly as a floating lake camp. In the summer I work from it. At 1800 RPM's it runs 7.5 kts, which is fine for our cruising needs. When we want to go fast, we use a different boat.

The engine starts easily and runs fine. No stalling or misfires. No steam or smoke. No overheating. No 'milky' oil. We use 91 octane ethanol-free fuel.

I will have our marina mechanic check her out. I'd like to be able to ask some intelligent questions (or at least understand half of what he tells me).

My reading makes me guess a fuel restriction problem? Planning to check fuel lines, anti-siphon valves, and mechanical fuel pump, water separator and fuel filters, and clean carb.

What other questions should I be asking?

Thanks... JB

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waybomb
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Re: Crusader won't break 2100 RPM's

Postby waybomb » July 6th, 2014, 9:58 am

First would be to check the throttle cable. When full open, is the carburetor butterfly fully open? You may be able to adjust the cable.

If the fuel filters (in carb and external) are fine, my next two guesses would be a partially blocked/stuck anti-siphon valve or bugs have built nests in your fuel tank vent fittings and are partially blocking the screen.

Let us know what you find.
Thanks
Fred
1964 Barron Flatbottom with BBC Chevy
1969 Glaspar Avalon /1969 Johnson Electromatic 85
1987 Carver Mariner
1988 Cougar Kevlar 46' with triple blown 572s
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Re: Crusader won't break 2100 RPM's

Postby Lyndon670 » July 7th, 2014, 11:36 am

"The Crusader engine in my '78 Santa Cruz 2866 won't break 2100 RPM."

Is that in gear, or in neutral?
Lyndon,
2000 Carver 506
FOXY JOE
Volvo 7.4TAMD
Queens Cove Marina
Georgian Bay, Ontario
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Jab
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Re: Crusader won't break 2100 RPM's

Postby Jab » July 7th, 2014, 7:20 pm

Actually, haven't pushed it to WOT in neutral.
If I get 3600 RPM in neutral, and only 2100 in gear, what else does that add to the list?
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Re: Crusader won't break 2100 RPM's

Postby Lyndon670 » July 7th, 2014, 11:35 pm

Drivetrain up to/including props. I'd start with a visual on the props. If no damage and boat new to you, probably under propped.
Lyndon,
2000 Carver 506
FOXY JOE
Volvo 7.4TAMD
Queens Cove Marina
Georgian Bay, Ontario
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Jab
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Re: Crusader won't break 2100 RPM's

Postby Jab » July 8th, 2014, 10:48 am

Actually, the prop is about the only thing I know is good! It was pretty badly "dinged" when I got it. Prior to launch I had the marina check the size, and had it restored.

Just curious- would under-propped affect RPMs, or speed at any given RPMs, or both?
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Re: Crusader won't break 2100 RPM's

Postby Lyndon670 » July 8th, 2014, 12:35 pm

It absolutely would. Simplistic comparison but paints the picture. Imagine you are riding a bicycle that has 24" wheels and you can go 30mph when you pedal as hard as you can. Now, take the same bicycle and put 20" wheels on it - do you think you could pedal 30mph if you pedal as fast as you can? Same physics applies to props, only it is compounded by not only the diameter of the prop, but also the pitch of the blade.

You can destroy a motor very quickly if you have a prop under/over what is recommended.
Lyndon,
2000 Carver 506
FOXY JOE
Volvo 7.4TAMD
Queens Cove Marina
Georgian Bay, Ontario
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Topic author
Jab
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Moosehead Lake, Maine

Re: Crusader won't break 2100 RPM's

Postby Jab » July 11th, 2014, 1:59 pm

So... Turns out I can get about 3500 RPM in neutral at the dock.
Under way I get to 2000 RPM with about 1/3 throttle (meaning 1/3 travel on the throttle lever)), and only about 2200 with WOT.
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waybomb
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Posts: 1968
Joined: February 5th, 2013, 9:24 pm
Vessel Info: 1987 3697 Carver Mariner
1988 Cougar 46 Kevlar Vee offshore
1969 15' Glaspar / 1969 Johnson Electrmatic 85
1964 Barron Flat bottom drag boat
A couple of dinghies
Location: Saint Joseph and Trenton, MI
Has thanked: 41 times
Been thanked: 284 times

Re: Crusader won't break 2100 RPM's

Postby waybomb » July 11th, 2014, 8:15 pm

Have you checked timing?
Thanks
Fred
1964 Barron Flatbottom with BBC Chevy
1969 Glaspar Avalon /1969 Johnson Electromatic 85
1987 Carver Mariner
1988 Cougar Kevlar 46' with triple blown 572s
http://s4.beta.photobucket.com/user/waybomb/library/
Past - 1988 2807, 1989 4207 Aft
User avatar

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Lyndon670
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Posts: 657
Joined: July 29th, 2013, 11:35 pm
Vessel Info: 2000 Carver 506
Volvo TAMD74EDC
Location: Georgian Bay
Has thanked: 124 times
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Re: Crusader won't break 2100 RPM's

Postby Lyndon670 » July 12th, 2014, 9:09 am

That's way low WOT in neutral. As waybomb says, check timing, check fuel. Make sure your secondary's in the carb are opening FULL.
Lyndon,
2000 Carver 506
FOXY JOE
Volvo 7.4TAMD
Queens Cove Marina
Georgian Bay, Ontario

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