3116 & 3126

fwebster said:
Fuel use falls dramatically as rpms decrease.

My 350/3116's burn 3.6 gph @ 1200 rpm; 5.8 gph @ 1500 rpm..............Mike's 3126's burn 4.0 gph @ 1200; at 1500 rpm he's burning 7.2 gph.

Trawler speeds.......trawler economy.
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Frank, are those numbers combined for both engines or is that per engine?
 
Frank said; My 350/3116's burn 3.6 gph @ 1200 rpm; 5.8 gph @ 1500 rpm..............Mike's 3126's burn 4.0 gph @ 1200; at 1500 rpm he's burning 7.2 gph.


agantman said:
Frank, are those numbers combined for both engines or is that per engine?
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That must be each / per engine.
 
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For some reason, my answer didn't post........Mike is right, the GPH I quoted is total for both engines.

Nope, no calculator problem. I've had the Cat engines for 14 years and 1400+, so I know what they burn.
 
Once you hit around 1900-2000 RPM's and the turbos kick in, fuel consumption jumps way up. On the trip from Ft Lauderdale to CT, my average fuel burn was 12gph, and I was movin'. I did 1400 miles in 8.5 days.
 
That's great information guys... thanks a lot:thumbsup:.
It's all good news too. It means a bigger boat probably isn't going to cost any more than what I pay now. The fuel consumption will be similar. I'll have to give up the boathouse (for now) for open moorage but they're expensive... so the moorage isn't going to increase much if any. Maintenance I can figure out and I have a diesel mechanic at work if I get 'stuck'. The only thing I'd have to be concerned about is if I had a catasrophic engine failure... I'd be eating mr. noodles for a while.
Diesels are known for reliability not catastrophic failures so hopefully... no noodles!
 
I was reading another thread about engine replacement costs. Around these parts a Merc 5.7 mag mpi replacement engine is about $13k complete, manifolds and all. What would one of these Cat engines cost like that?
I'm sure all the parts are still available since they made millions of them...
These engines are almost always repaired unless the block gets a hole in it or something like that right?
What do replacement manifolds / risers cost... or do they use a different method of cooling the exhaust?
Let me know when yer' sick of the questions :lol:
 
Not just repaired, but remanufactured. Diesels are almost always rebored, new liners installed, new pistons fitted, crankshafts renewed and new bearings installed. A remanned marine 3116/3126 will cost from $18K up, depending upon your source and warranty offered.

My engines do not have cast iron risers/elbows, they are bronze. For the most part, diesel owners don't have the exhaust cost and worries that a Mercruiser owners does. It is hard to fins a Merc with over 1000 hours, but it isn't at all unusual to find diesel owners with 5000+ hous on their engines..........and the difference isn't wear as much as water ingestion from exhaust castings. I checked my riser/elbows at 10 years and they looked like new; I'm at 14 years and 1400+ hours now with original exhaust parts with 100% salt water useage.
 
fwebster said:
Not just repaired, but remanufactured. Diesels are almost always rebored, new liners installed, new pistons fitted, crankshafts renewed and new bearings installed. A remanned marine 3116/3126 will cost from $18K up, depending upon your source and warranty offered.

My engines do not have cast iron risers/elbows, they are bronze. For the most part, diesel owners don't have the exhaust cost and worries that a Mercruiser owners does. It is hard to fins a Merc with over 1000 hours, but it isn't at all unusual to find diesel owners with 5000+ hous on their engines..........and the difference isn't wear as much as water ingestion from exhaust castings. I checked my riser/elbows at 10 years and they looked like new; I'm at 14 years and 1400+ hours now with original exhaust parts with 100% salt water useage.
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So the rumors of having to re-mortgage for some engine repairs are a bit of a stretch. ok
What yer' saying is the cooling configuration is similar/same as the gas engines (water still exits the riser or elbow) but the exhaust is made of bronze and that lives a long happy life? Are the bronze pieces standard or did you put those on? Also I noticed on another thread you mention some sort of intake noise suppressor (can't find the thread now) that gets rid of some engine noise. The noise is bad enough that your doggies not want to go boating! What does it do to make it quieter and are those aftermarket items?

Part of my future upgrading is pending on selling the 2 boats I have... and I have a serious buyer for my Campion. We're working out the details now but he said he needs the boat by the end of the month. I'm optomistic.
So I've been looking around. I'm on the fence with what style of boat to get... something like this '99 40' DA or something like this '00 40' DB.
Oh one of life's so difficult decisions... lol
 
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The turbo squeal on a Sundancer can get loud and it is high frequency. The answer is to install Walker AirSeps and the problem as well as crankcase fumes are gone forever. Sea Ray specified that Ringhaver Cat, their local distributor, install AirSeps on all Cat engines after about 1997...........but its only a $1600 deal anyway if you don't have them.

Caterpillr builds things differently then Mercruiser. The Cat exhaust system is designed to last the life of the engine, not just till the warranty runs out.
 
I have airseps and my turbos are still loud. I don't know why. But it's just about the same volume as having no airseps.
 
Turtlesboat said:
I have airseps and my turbos are still loud. I don't know why. But it's just about the same volume as having no airseps.
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Maybe you have a bit more prop than Frank... and your engines have a bit more load on them... so they're making hotter exhaust gas... which is creating more boost... that makes the turbos squeal a bit louder.
lol... I just made that up...
Now that I know the name 'AirSep' I googled them. This is a 'closed crankcase system' and apparently the noise 'silencer' is an option that is sold seperately. Is the silencer the filter?
Only $1600 'eh? :lol:

28.jpg
 
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magster65 said:
So the rumors of having to re-mortgage for some engine repairs are a bit of a stretch. ok
What yer' saying is the cooling configuration is similar/same as the gas engines (water still exits the riser or elbow) but the exhaust is made of bronze and that lives a long happy life? Are the bronze pieces standard or did you put those on? Also I noticed on another thread you mention some sort of intake noise suppressor (can't find the thread now) that gets rid of some engine noise. The noise is bad enough that your doggies not want to go boating! What does it do to make it quieter and are those aftermarket items?

Part of my future upgrading is pending on selling the 2 boats I have... and I have a serious buyer for my Campion. We're working out the details now but he said he needs the boat by the end of the month. I'm optomistic.
So I've been looking around. I'm on the fence with what style of boat to get... something like this '99 40' DA or something like this '00 40' DB.
Oh one of life's so difficult decisions... lol
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I have no connection to this add http://minneapolis.craigslist.org/hnp/boa/2119730133.html but it was originally listed last spring and has been popping up every now and then.
 
magster65 said:
Maybe you have a bit more prop than Frank... and your engines have a bit more load on them... so they're making hotter exhaust gas... which is creating more boost... that makes the turbos squeal a bit louder.
lol... I just made that up...
Now that I know the name 'AirSep' I googled them. This is a 'closed crankcase system' and apparently the noise 'silencer' is an option that is sold seperately. Is the silencer the filter?
Only $1600 'eh? :lol:

28.jpg
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It also keeps the ER cleaner by catching any oil mist from the crank case.
 
Turtlesboat said:
It also keeps the ER cleaner by catching any oil mist from the crank case.
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Yeah... the article I read said it was a closed crankcase system instead of an open breather. Oil 'mist' makes a mess!

In my old Tolly I forgot to put the oil filler cap back on and proceeded to go for a sustained high rpm cruise. I smelled something so I slowed down and opened the engine hatch... I just about crapped and fainted! :lol:
It was a perfectly detailed engine compartment... what a friggin' mess!
 
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