Replying to Topic 'Engine Issues'
You know more than I do, but in an effort to delay my 2000 m swim here ya go.
There are books on this stuff, big, big books that cost a few $100 (last I heard), they target a motor. The boat mods may be in another book. Your dealer MIGHT have them, but they will be for the motor that came with the boat. They may be on CD now. These books have updates. I know you have the book if you are doing this but you might not have the updates. Are they on CD now?
If you are replacing a motor, why not go to fuel injection, esp if you are doing the work? Carbs are not simpler than FI and always fussy. I’ve never liked them ever since a leaking Carb lit my Plymouth Duster on fire 20 years ago.
Someone here will know more about the RPMs settings etc IF the motor is one they use on the boats. If it is one used by Sanger etc. I’d check there. I know I run WOT at about 4000 RPM (EFI Engine) and that they have crept up as the boat hours have gone up.
Why/how did the engine overheat in the first place? 90 hours is not expected status.
SD2
One other thought. If the Carb is definitely the problem IF there is a problem why not just press on. You can fuss all you want with the carb after you get the boat running. If you are using the original carb, changing the thing may be just adding to your work later.
Be sure it does not leak.
Replying to Topic 'Engine Issues'
Thank you for the reply, Smokedog. I'm a bit confused by some of the content in your post and I'm hoping mainly to find answers to the two main questions, based on other people's experience here. I am running the standard INDMAR 350 Carb engine that is default with the non-V-drive Moombas (Outback & older models).
One update. I explained the advance numbers incorrectly. When I set the advance in 'freeze mode" at 10 BTDC, this changes immediately to 21 upon "un-freezing" which yields up to 30 total advance at 3,000 RPM (and never goes any higher). In other words this would cause my engine to idle in 21 degree advance, which I feel is much too high. Could SkiDIM be wrong -- is this not the matching module used by INDMAR?
Thanks again for any suggestions,
-Rusten
Replying to Topic 'Engine Issues'
Quote:
I'm a bit confused by some of the content in your post
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sd.....he has that effect on ppl. But still provides excellent insight
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Truth be known, me?......not so much
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lmao
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My '04 Outback DD revs to factory specs. so I am not sure of the issue. I think I've read somewhere that the V-drives are pinched off simply because of the V-drive configuation. More complicated drive train = more fragile components? It could be the trans, with bevel / angle gearing cannot stand the rpm's that a DD can.......4200 on a V vs. 4600 on a DD.
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Hope this helps
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B
Replying to Topic 'Engine Issues'
My 98 Mobius, 350, the 4bbl seems to kick around 3200 rpm. I can tell they're kicked in by pulling back from full throttle and you can hear the 4bbl closing up. It sounds like the hiss from an air hose for a second.
Replying to Topic 'Engine Issues'
And it may simply be a linkage problem. Check to see how far you have to engage the throttle lever before linkage @ the carb starts to move. If lever moves a quarter travel or more b4 linkage do, take out some of the play and test again.
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Hope this helps
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B
Replying to Topic 'Engine Issues'
Thank you Buttafewcoe & zabooda.
I have the straight shaft. I believe it previously maxed at 5,200 RPM before the new engine; now I'm maxed out at about 3,900 - 4,100. Buttafewcoe, you mentioned that yours revs to spec; I didn't see a spec for max RPM's in my literature -- can you tell me where that is?
The first thing I checked is the linkage, although maybe I'm not doing it right. I had removed the throttle cable and instead used my hand to push the carb-throttle all the way down, making sure it is absolutely maxed -- same result.
It revs easily to redline *without* load. Is there something that could be putting too much load on the motor? I checked the alignment of the shaft and the prop is perfect.
Anyone have a Indmar 350 Carburated (310hp) in a similar boat (Outback, Kanga)? Do you happen to know what your WOT RPM's are?
Thank you in advance,
Rusten
Replying to Topic 'Engine Issues'
According to the book, 4800 RPMs. At WOT 4800, 46 mph. But that is for my '04 Outback.
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Hope this helps
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B
Replying to Topic 'Engine Issues'
That does help -- and confirm my original experiences, thank you.
Assuming the engine works fine (which isn't entirely true, but assuming for now). Is there any reason why I could have exessive load on the engine. For example, is there something that could be incorrectly linked to the transmission to make it more difficult to turn the prop?
I've checked the prop and it's fine -- I'm just wondering about other issues that could create excessive load, that would in-turn would limit the engine's ability to perform.
Thanks again!
Replying to Topic 'Engine Issues'
A freshly rebuilt engine that has been put together 'tight' (minimum clearance on the journals, et. al.) may not rev to capablilty as a broken in one would.
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You may want to try a 10w-30 or 5w-30 oil during the break in. Think carefully about that before you do.
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Does the prop turn by hand? Or is it a struggle to get it to move?
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Engine to shaft alignment?
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Do you have the stock prop or an aftermarket one? All things being equal, to get more revs (and maybe loose some top end) you could reduce the pitch of the prop (aren't these 13 x 13?) to gain rpms, don't know if that's the answer, tho
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Hope this helps.
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B