low end torque and top speed problems
Printed From: CorrectCraftFan.com
Category: Repairs and Maintenance
Forum Name: Engine Repair
Forum Discription: Engine problems and solutions
URL: http://www.CorrectCraftFan.com/forum/forum_posts.asp?TID=4188
Printed Date: November-27-2024 at 8:29am
Topic: low end torque and top speed problems
Posted By: SportNautique96
Subject: low end torque and top speed problems
Date Posted: July-15-2006 at 5:38pm
|
I have a 96 Sport with the GT40 EFI motor with a 4 blade prop. I know that the 4 blade prop is supposed to add low end power but take some off of the top speed, but this is a little drastic. My parents' 82 Nautique pulls about 4 times as hard as the Sport and tops out at around 45 mph. The Sport is sluggish to start and tops out at 38mph @ 4200 rpm. When I stand at the back of the boat with it idling I can sometimes smell a hint of gas. Anyone know what could be up?
|
Replies:
Posted By: The Dude
Date Posted: July-15-2006 at 9:53pm
My 95 sport has gt40 heads but is carbeurated. I have the factory three blade. 46mph at 4400rpm is about right for me.
I'm not an expert on props, but someone's going to ask you what the pitch is and what kind of prop it is.
Your gas smell near the exhaust is probably normal unless it's really strong. If you were leaking much fuel, you might notice it disappearing on your fuel gage.
When you say sluggish to start, do you mean starting the engine or your hole shot? You might start with the fuel water separator or fuel filter if you have one. I'll let someone else weigh in on fuel issues w/and efi. Most of these guys know about 5 times what I do.
-------------
Mullet Free since 93
http://www.correctcraftfan.com/diaries/details.asp?ID=717&sort=&pagenum=1&yrstart=1991&yrend=1995 - 95 Sport
|
Posted By: SportNautique96
Date Posted: July-16-2006 at 1:13am
I have no idea what pitch the prop is, all i know is that it is a 4 blade.
The hole shot is what I'm talking about when I say it is slow. It doesn't cut out or anything, it just doesn't seem to have the correct amount of power. I can hardly even get up on slalom it's so slow.
|
Posted By: 79nautique
Date Posted: July-17-2006 at 12:47pm
sounds like the prop is over pitched for the boat and that the carb may need adjusted a little. Look on the side of the prop and there should be some stamped numbers to indicate the dia X pitch or a model number. We'll need that before we can sort this out.
-------------
http://www.correctcraftfan.com/diaries/details.asp?ID=756&sort=&pagenum=1&yrstart=1979&yrend=1979 - 79 nautique
|
Posted By: SportNautique96
Date Posted: July-18-2006 at 4:26pm
|
I'll check that later tonight, and the motor is EFI, not carbureted
|
Posted By: SportNautique96
Date Posted: July-21-2006 at 8:15pm
|
the prop is an OJ 13 x 16 Pcup.
|
|