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Old 21 March 2007, 16:32   #1
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Outboard Servicing

Why does an average outboard need servicing every 100 hours ?

If that was a car it would be in the garage every month. Hardly efficient.
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Old 21 March 2007, 17:34   #2
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because, unlike cars, boat dont have gears,
they have forward neutral and reverse and that it....o and your prop

cars arnt run hard all day long, they cruise along at about 2k revs

boats on the other hand run flat out all day at anything from 4-6k revs

if you put a car engine...say a rover sd1v8 engine into a boat..it wouldnt last 5 mins as marine engines are completely different to cars altho many people dont seem to realise this fact

so thats why they need regular maintenance, expecialy 4 strokes !

the prop is the only way of changing gear by either going up or down a pitch,

under-reving a marine engine will seriousy reduce engine life as they are labouring

dan
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Old 21 March 2007, 17:44   #3
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So why is the that running any other petrol engine at full bung all the time wrecks it ?..
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Old 21 March 2007, 17:47   #4
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cars arnt run hard all day long, they cruise along at about 2k revs
Bloody hell mine doesn't.
More like between 3000 and 4000 max.

If I remember what I've been taught with regards driving 2000 revs is the absolute minimum for a car engine and its when you should be considering changing down a gear.

Hope I get caught behind you at 2000 revs on a duel carraigeway. Round town you'd be like driving Miss daisy.
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Old 21 March 2007, 17:49   #5
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By the way why do I have a 10 year old two stroke mower thats never had a service and never had oil in the fuel still running just like new.

Maybe we should get lawn mower engine technology fitted on our boats.

I know its used on super fast go karts.
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Old 22 March 2007, 02:34   #6
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I suppose part of the issue is that if your 2 stroke lawn more broke down in the middle of the lawn... in a force 8... it would be no big deal.
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Old 22 March 2007, 02:58   #7
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Actually, every 100 hours isn't that bad. Look at it this way.

Outboards are run hard-say equivalent of 75-100mph in a car most of the time.
That's equivalent to a service every 7500-10000 miles. Considering the operating conditions that's pretty good.




I'm not going to answer Wreck Raider's point on car engines. I don't want to be seen to be attacking new members! (See, I CAN be nice! )
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Old 22 March 2007, 03:26   #8
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I know its used on super fast go karts.
18,000 plus RPM and 3hour rebuilds on a super fast kart with no gears!

Wreck Raider - I have to say it won't ruin your engine by under revving a marine engine unless it is totally overpropped - just going slowly is fine!
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Old 22 March 2007, 14:48   #9
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I suppose part of the issue is that if your 2 stroke lawn more broke down in the middle of the lawn... in a force 8... it would be no big deal.
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Old 22 March 2007, 15:11   #10
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Quote:
Originally Posted by Nos4r2 View Post
Actually, every 100 hours isn't that bad. Look at it this way.

Outboards are run hard-say equivalent of 75-100mph in a car most of the time.
That's equivalent to a service every 7500-10000 miles. Considering the operating conditions that's pretty good.




I'm not going to answer Wreck Raider's point on car engines. I don't want to be seen to be attacking new members! (See, I CAN be nice! )
Oh boy, Nos has some common sense( very rare) and is also " a nice guy"
Good post
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Old 22 March 2007, 15:30   #11
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Oh boy, Nos has some common sense( very rare) and is also " a nice guy"
Good post

OI!
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Old 22 March 2007, 15:43   #12
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if you put a car engine...say a rover sd1v8 engine into a boat..it wouldnt last 5 mins as marine engines are completely different to cars altho many people dont seem to realise this fact

dan
Oh really, why is that then? I fitted that same motor into a sportsboat, and it ran fine for 9+years. And what about Chevy V8's, the same motor as used by Mercruiser and Volvo for 20+ years.
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Old 22 March 2007, 15:48   #13
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OI!
That was a compliment, sorry to ruin your reputaion
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Old 22 March 2007, 17:41   #14
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....
If I remember what I've been taught with regards driving 2000 revs is the absolute minimum for a car engine and its when you should be considering changing down a gear.

Hope I get caught behind you at 2000 revs on a duel carraigeway. Round town you'd be like driving Miss daisy.
My (latest) motor's only turning around 2000 RPM at 60 MPH...and it'll sit there all day, quite happily......
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Old 22 March 2007, 17:44   #15
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Oh really, why is that then? I fitted that same motor into a sportsboat, and it ran fine for 9+years. And what about Chevy V8's, the same motor as used by Mercruiser and Volvo for 20+ years.
Now c'mon, nobba...some of the components are changed... 'cause of all that nasty salt water...
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Old 22 March 2007, 19:28   #16
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By the way why do I have a 10 year old two stroke mower thats never had a service and never had oil in the fuel still running just like new.
Is your mower oil injected?
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Old 23 March 2007, 03:33   #17
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By the way why do I have a 10 year old two stroke mower thats never had a service and never had oil in the fuel still running just like new.
Try dipping half of the mower in the sea and running it on moist salty air. I wonder how long it would last then. It takes a bit of engineering to extract 150/200 hp out of a 2st and keep it reliable. Your mower is a plug and a coil.
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Old 23 March 2007, 03:39   #18
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Oh really, why is that then? I fitted that same motor into a sportsboat, and it ran fine for 9+years. And what about Chevy V8's, the same motor as used by Mercruiser and Volvo for 20+ years.
Yep, the only difference is that the Mercruiser 5.7 ltr has a mechanical fuel pump run off of the crank and the 350 Chevy has an electronic pump (less sparks). Yamaha use it also. It's a cast-iron monster, as long as it's flushed and well winterised, it'll go on for ever.
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Old 24 March 2007, 04:37   #19
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By the way why do I have a 10 year old two stroke mower thats never had a service and never had oil in the fuel still running just like new.
I dont understand. How can a 2-stroke mower (or any engine for that matter) run without any oil?
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