sluggish at best

[thurps]

I am looking at a Bayliner 24 CC Trophy. Went on a test drive and was surprised at how sluggish it was. It has a Volvo 270 outdrive and at WOT it would only make 2800 rpm before dropping over on plane and then only about 3200/3400. The original owner said it just had a tune up and "that's the way it's always run." The engine idles and runs smooth. I looked at the throttle linkage and it appeared to fully open the carb. My guess is that it is way over propped. Could anyone with a similar setup let me know what prop they are running or is that just the way they are.
Thanks.

 

[thurps]

Re: sluggish at best

Sorry, Chevy V8.

 

[gcboat]

Re: sluggish at best

Not enought answers to help you. Year, size of motor, carbed or F.I.?
What size wheel are you using now?

 

[BAYLINER185]

Re: sluggish at best

Well WOT on a V8 Chevey should be a lot higher then 2800 RPM

Something is way wrong! Over proped or low compression.

I dont know theres a lot of things needed checking out. If its a Chevy its got a MERCRUSER...It will tell you right on the air cleaner what the WOT should be.

 

[kaferhaus]

Re: sluggish at best

I'm betting it has at least one cyl low on compression. Or if the engine has sat up any length of time they could all be a little low. which would explain the smooth idle.

I've rarely seen an engine that sat up any length of time not have issues of some sort unless the owner was very meticulous in the way he stored the engine.

And I/Os for some reason seem to get even less care than OBs.

I'd tell the seller you want a compression test done.

Usually if the boat is way over propped you'll get a severe hesitation when you try to accelerate then the motor picks up but never reaches full rpm.

I have a Nissan that was way over propped and it drove me nuts until I finally figured it out as the pitch didn't seem like it could be that far off.. but the engine checked out fine in every respect and accelerated great when not in the water... never hesitated going from idle to full throttle. In the water, the boat would damned near stop before the engine would pick up accelerate slowly to planing speed and then stop about 1000rpm short of where it should be for the load.

On that engine I had to drop 4 numbers on pitch!

I've also had engines that sat up and then had rings stick... sea foam usually cured that but sometimes the engine had to come apart.

Glad you water tested the boat!