PDA

View Full Version : Mercury Tech 280 Merc preformance qustions


Hotboat1
08-22-2010, 08:39 PM
I have a 2002 280 and was wondering what temp it should be at idle and at WOT... it reads 120 degrees at idle and 150 degrees ar WOT.Also EGT's are 1000/ seems a little cool.
Chummy
08-22-2010, 09:22 PM
water temp will vary but the egt's should be higher. What is some info on the engine? any changes to the fuel curve been made?
Velle_Bob
08-22-2010, 09:56 PM
I would not want the temps to be much higher as you will be approaching the boiling temperature of water. Especially in the higher altitude of Montana. Air bubbles are not good in water jackets.
Hotboat1
08-22-2010, 10:02 PM
All stock......
water temp will vary but the egt's should be higher. What is some info on the engine? any changes to the fuel curve been made?
Hotboat1
08-22-2010, 10:14 PM
Stick to sailboats ya dumb azz!
I would not want the temps to be much higher as you will be approaching the boiling temperature of water. Especially in the higher altitude of Montana. Air bubbles are not good in water jackets.
Velle_Bob
08-22-2010, 10:40 PM
If your water temperature is changing that much, I would replace the thermostat. That's what we do in our sail boats.
Hotboat1
08-23-2010, 02:13 PM
Thanks Popeye :)
If your water temperature is changing that much, I would replace the thermostat. That's what we do in our sail boats.
Chummy
08-23-2010, 03:09 PM
280'S don't have thermostats..... idle they cool down, running they warm up quite a bit. Do you know if you have 5 petal reeds or 7 petal? Have the injectors been flowed & tested? If you have 5 petals and the injectors are in good shape you should be able to move your fuel curve to -2. If you have any questions feel free to PM me.
Hotboat1
08-23-2010, 08:56 PM
Not sure on the reeds. I will check into that and get back to you, thanks