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Old 24-07-2009, 09:03 AM   #1
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Country: engalnd
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promx 225

i worry ALOT, as there was an odd sound comming form the rear, at ilfracombe as i came in, like a chunking sound
but anyway as on the subject thought id ask, is it normal of these engine at idle, on the hose pipe or in the water not to put any water though the tell tail, as soon as you acellerate, theres shed loads, but not when your just pottering around the harbour
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Old 26-07-2009, 12:58 PM   #2
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225 Promax

Hey

Our promax sounds the same as yours at idle, there is no tell tale and when you get going there is plenty of water. Also do you have a water pressure gauge, we find ours vital.

About the noise im not really sure what your saying but ours idles realy rough when its warmed up.

Dont take my word about the noise though, you can never be to careful about engine noises.

Antic
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Old 26-07-2009, 07:47 PM   #3
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Our Promax sounds beautiful, purrs compared to the bridgeport it replaced.
It also chucks tons of water at idle and has buckets of pressure at full throttle, 25/28 psi

Is there thermostats in it? When was last time you changed water pump?
The BP used to chuck a good stream at idle with a healthy water pump but after a few weeks it started to dwindle. Half an hour and a tenner is cheep insurance I think!

Alan
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Old 26-07-2009, 10:48 PM   #4
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Country: engalnd
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Boat name: Jack'd up, hellraiser
Boat make: Bernico 19 ET, ring 16
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Yea have water pressure guage and I haven't really investegqted the found much, my promsx doings similar to the first post, runs not rough, but certainlet wouldn't say it rsn as purry as an opti for instance
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Old 27-07-2009, 12:03 AM   #5
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Country: new zealand
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Boat name: Anti Cyclone
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225 Pro max

25/28 psi. Oh my god thats huge, we get about 2 at idle and 11 at full throttle we were concerned with this but our mechanic assured us that its fine. He also says that the engine is in tip top condition (except the gearbox which is currantly shagged.

Ok my description of rough idle may have been the wrong way to describe it, you know its never gonna stall or anything like that, what i mean to say is that it has lumpy idle around 700 - 750rpm.
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Old 27-07-2009, 12:58 AM   #6
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Quote:
Originally Posted by antic55 View Post
we get about 2 at idle
yeah, that's about right, what gearcase did you run, may have something to do with water pressure.

I think all the mercs have a lumpy idle
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Old 27-07-2009, 04:18 AM   #7
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Promax 225

We run a sporty(which were not really happy with), which i think our mechanic said is the reason for the low water pressure. I have to admit i think the lumpy idle sound mint.

Were just waiting for our mechanic to get back from belgium so he can rebuild it.

Antic.
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Old 27-07-2009, 10:08 PM   #8
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Your Promax had brand new stats in the weekend you picked it up. Your tell tail should just be spitting a little at idle and on the tap as the stats should be closed. As long as your getting 15psi plus when moving then your cooling system is working fine.
I took advice from Jay Smith on weather or not to take the stats out of this engine. He told me that if I did it would cook it because its got steel liners and needs the water to travel slower to absorb the heat. Chaos however removed the stats from his later model 225 and ended up having to have a new piston put in his engine.
Chill Chris, Your engine is fine!
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Old 27-07-2009, 10:49 PM   #9
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Country: engalnd
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Boat name: Jack'd up, hellraiser
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Told you I worry to much, ran the boat up on the hide today, and taking it out tomorra fir a propa run LOL, cheers for confirming my worries rob, the sound turned out to be a loose bolt... Well that's all I can track it back too
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Old 28-07-2009, 02:01 AM   #10
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Quote:
Originally Posted by MrRob View Post
needs the water to travel slower to absorb the heat.
Not one to question Jay Smith, but less water = cooler motor! I don't think so!

More water = cooler motor, less water = warmer motor, which is what you want on a steel bore. Aluminium (pistons) expands quicker than steel (cylinders).

should be 140* thermostats
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Old 28-07-2009, 09:16 AM   #11
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Quote:
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Not one to question Jay Smith, but less water = cooler motor! I don't think so!

More water = cooler motor, less water = warmer motor, which is what you want on a steel bore. Aluminium (pistons) expands quicker than steel (cylinders).

should be 140* thermostats
The water may not travel too fast because it has to pick up the heat. When it flows slower it will pick up more heat. (but than again too slow isnt a good idea either)

This is what I read somewhere...

Imo you just have to run the stock cooling on any engine. Steel sleeves => 2 piece adapter & Bp, 260 & 280 => 1 piece
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Old 28-07-2009, 09:49 AM   #12
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Quote:
Originally Posted by freedom View Post
Told you I worry to much, ran the boat up on the hide today, and taking it out tomorra fir a propa run LOL, cheers for confirming my worries rob, the sound turned out to be a loose bolt... Well that's all I can track it back too
You racing at Torquay then?Nic
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Old 29-07-2009, 12:12 AM   #13
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Quote:
Originally Posted by Hydrostream View Post
Not one to question Jay Smith, but less water = cooler motor! I don't think so!

More water = cooler motor, less water = warmer motor, which is what you want on a steel bore. Aluminium (pistons) expands quicker than steel (cylinders).

should be 140* thermostats
That's a bit of a mistake, Jay never made that quote over a steel bore motor.
Jay always says you need to limit the water through a steel liner block so that it runs hotter. Otherwise you risk a cold sieze problem where the liners don't expand as fast as the pistons resulting in no clearance.
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Old 29-07-2009, 12:32 AM   #14
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Quote:
Originally Posted by marshan162 View Post
That's a bit of a mistake, Jay never made that quote over a steel bore motor.
Jay always says you need to limit the water through a steel liner block so that it runs hotter. Otherwise you risk a cold sieze problem where the liners don't expand as fast as the pistons resulting in no clearance.
Which is exactly what is written there! No?
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Old 29-07-2009, 12:40 AM   #15
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Quote:
Originally Posted by Hydrostream View Post
Which is exactly what is written there! No?
Sorry mate that didn't look quite right 'quoting' your post, i should have quoted the earlier post originally quoting Jay. I agree with you. You need less water flowing through a steel motor so that it runs hotter

Hope that's clearer
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Old 29-07-2009, 12:47 AM   #16
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Quote:
Originally Posted by marshan162 View Post
Sorry mate that didn't look quite right 'quoting' your post, i should have quoted the earlier post originally quoting Jay. I agree with you. You need less water flowing through a steel motor so that it runs hotter

Hope that's clearer
No bother mate, sometimes I have trouble understanding myself, and wonder if anyone has a clue what I'm on about!

Al
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Old 12-08-2009, 06:12 PM   #17
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The Pro Max with the 40 amp charging systems can and will make a thump thump thump as the flywheel is passing the charging magnets at a slow idle.

Jay @ JSRE
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