jetting question
#1
Registered
Thread Starter
Join Date: May 2001
Location: Kemptville, Ontario, Canada
Posts: 38
Likes: 0
Received 0 Likes
on
0 Posts
jetting question
What kind of actual performance gains can be had from propper jetting? The plug colour I have know is a dark chocklate brown, would I gain as much as 200 - 300 more rpm by jetting a bit leaner or is the risk of dammage not worth the extra speed? (Dumb question)
#2
Registered
Join Date: Jan 2001
Location: Holland MI
Posts: 3,140
Likes: 0
Received 0 Likes
on
0 Posts
It doesn't sound to me like you're too far off now. Are you checking the plug color right after a hard run without any idle time? Even a short time idling in to the dock will darken the plugs.
#3
Registered
Join Date: Sep 2001
Location: Houston, TX, USA
Posts: 2,287
Likes: 0
Received 0 Likes
on
0 Posts
If jetting is too rich & you leaned to correct A/F ratio you could gain 200+ rpms. If jetting is too lean, you may gain 200+ for a short time before the motor melts down. Key point is correct jetting from being too rich. I remember where Hot Boat had a motor on a dyno & motor gained 85 hp in getting jetting right on.
#4
Registered
Thread Starter
Join Date: May 2001
Location: Kemptville, Ontario, Canada
Posts: 38
Likes: 0
Received 0 Likes
on
0 Posts
Plug reading was done after running at 4500 rpm for 10 minutes or so but not held wide open. I shut the engine down right away and checked plugs
Thread
Thread Starter
Forum
Replies
Last Post
34Mach1
General Boating Discussion
5
03-26-2008 01:50 AM