[C36IA] prop pitch and engine problem

[Darin Duphorne]

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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