[C36IA] prop pitch and engine problem

[Mark Tamblyn]

This sounds like a fuel problem to me too.

Check through the fuel system from start to end, Is the pickup blocked?
are you getting good flow into the racor filter is the filter blocked?
How old is the fuel in the tank? Replace the fuel filter on the engine
for good measure. Fill the racor bowl with injector cleaner and run that
through the engine. Hey by the time you have done this you will be
expert in bleeding the air out of the fuel system.

 

Don't trust a tach run off the alternator as stated in other posts.

 

Mark Tamblyn

1987 C34 Alena #326

Gloucester Point VA

 

 

 

From: c36list-bounces at c36ia.com [mailto:c36list-bounces at c36ia.com] On
Behalf Of Darin Duphorne
Sent: Thursday, July 02, 2009 8:20 AM
To: Catalina 36 Association Mailing List
Subject: Re: [C36IA] prop pitch and engine problem

 

My father-in-law (a former diesel mechanic) tells me it just almost
can't be a compression issue since the engine only has 160 hours.  He
says no black smoke means no air problem.  His best guess is fuel if
it's not the pitch.  

 

Further thoughts/ideas?

 

On Jul 1, 2009, at 9:28 PM, Tom Senator (tsenator) wrote:





Yeah I might agree.... Maybe fuel contricted (clogged fuel filters will
achieve full rpms under no load but bogg down under load)

Or maybe restricted air?

I apologize for the brevity- I am responding from a Def
Leopard/Poison/Cheap Trick concert with the Admiral and her kids

I think u can guess how much I am into the concert ..... LOL
This is being sent from my handheld - I apologize for the brevity

----- Original Message -----
From: c36list-bounces at c36ia.com <c36list-bounces at c36ia.com>
To: darinhouston at sbcglobal.net <darinhouston at sbcglobal.net>; 'Catalina
36 Association Mailing List' <c36list at c36ia.com>
Sent: Wed Jul 01 22:05:18 2009
Subject: Re: [C36IA] prop pitch and engine problem

Darin - Did you have an engine survey done? Sounds like you're not
getting
enough fuel or have compression problems.

Craig

-----Original Message-----
From: c36list-bounces at c36ia.com [mailto:c36list-bounces at c36ia.com] On
Behalf
Of Darin Duphorne
Sent: Wednesday, July 01, 2009 6:57 PM
To: c36list at c36ia.com
Subject: [C36IA] prop pitch and engine problem

I'm post-survey, but still pre-purchase of a 2000 C36MKII with a Max-
Prop 3-blade feathering prop.  I've read enough of the forum posts to 
get an idea what rpm and hull speed I should be getting but it's 
really weird, and I can't tell what might be causing the issue other 
than prop pitch.

In the sea trial, I was only getting about 4.5kts under full power in 
flat lake conditions.  Free rpm was around 2850 and loaded rpm was 
about 2800 (50rpm droop -- not enough).

We asked seller to repitch to confirm, and he's been having a diver do 
it with no success.  Here are the things they've tried...

15x18   4.5kts  2800rpm
15x20   6.7kts  1800rpm
15x18   6.8kts  1900rpm
15x16   7.0kts  16-1700rpm (yikes!)

It's weird!  I can't imagine an engine related issue, or it wouldn't 
get to 2800rpm, I wouldn't think.  Compression problems when loaded?

Any ideas?
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