Mercruiser 3.0 questions???

[cvbdrew]

Re: Mercruiser 3.0 questions???

I appreciate all the suggestions and opinions.

Yesterday I spent $80 on carb cleaner and a rebuild kit. The carb was pretty dirty and had never been taken apart. The filter just inside the fuel line connection was pretty nasty. After a good cleaning, new jets and filter...she's running better than ever! It was my first boat carb rebuild but not my first time looking inside a carb. Needless to say I was nervous but it's all back together running great and ready for summer fun! Now I just have to get it out of the water and grease my trim pivots and she'll be perfect!

Thanks again,
Drew

 

[QC]

Re: Mercruiser 3.0 questions???

diesels burn about 75% of the fuel and nat gas is a catalyst used to help burn part of the remaining 25% thus more power

What we do is quite a bit different. We use as much as 92% Nat Gas (CNG or LNG) and 8% diesel, average around 85/15. The diesel is used as a Pilot for ignition and timing. We can go down as low as 1% with a micro diesel injector.

We attempt to match diesel power, but our primary goal is economic as we can save as much as $2 a gallon or more for every diesel gallon replaced with Nat Gas. Depends a lot on high diesel cost like the UK at near $8 a US gallon, but we can make a case for a dollar a gallon here today.

It's called dual-fuel and it is not new. Some of the largest diesels in the world use it for marine propulsion. LNG Tankers use the boil off gas that woudl've gone into the atmosphere . . . voila, free fuel. The biggest practical advantage is they can run 100% diesel without shutting down, can switchover in one revolution. We concentrate on truck engines.

Sorry for the hijack Drew! :redface:

 

[alumi numb]

Re: Mercruiser 3.0 questions???

What we do is quite a bit different. We use as much as 92% Nat Gas (CNG or LNG) and 8% diesel, average around 85/15. The diesel is used as a Pilot for ignition and timing. We can go down as low as 1% with a micro diesel injector.

We attempt to match diesel power, but our primary goal is economic as we can save as much as $2 a gallon or more for every diesel gallon replaced with Nat Gas. Depends a lot on high diesel cost like the UK at near $8 a US gallon, but we can make a case for a dollar a gallon here today.

It's called dual-fuel and it is not new. Some of the largest diesels in the world use it for marine propulsion. LNG Tankers use the boil off gas that woudl've gone into the atmosphere . . . voila, free fuel. The biggest practical advantage is they can run 100% diesel without shutting down, can switchover in one revolution. We concentrate on truck engines.

Sorry for the hijack Drew! :redface:

sorry also but this is very interesting to me.
some were in my archives there is a propane set up i want some time to put together.
i got it from one of the diesel forums, need to look it up now.
thanks and if your willing to share more i'm all ears.
i wonder how bruce crowers 6 stroke engine would work in a boat.
seems viable if economy is the important issue.
thanks!

 

[alumi numb]

Re: Mercruiser 3.0 questions???

there it is!
woodward 12v solenoid, woodward lpg vaporizer, hobbs pressuer switch, toggle switch.
i didn't get off subject did i?

 

[tawood]

Re: Mercruiser 3.0 questions???

As an ex-aircraft mechanic I have to laugh at some of the posts about octane...the OCTANE is not going to burn your valves (and 120/100 octane aviation fuel isn't as high an octane as the "120" makes you believe...can you say just above 94 pump fuel?) Aviation fuel has a COMPLETELY different formulation than car gas though, that WILL cause some problems due to almost no vaporization, high lead content, etc...

CVBDREW: did you buy your high octane gas at a non-busy gas station? What can happen is when a person tries high octane gas, they buy it at a station that almost never sells it's high octane (due to no market, or too high a price, etc). What you end up buying is 2 year old, contaminated, LOW OCTANE gas (as gas ages it decreases octane). That would be my guess...too coincidental that the gas change would occur right as you develop an unrelated carb problem.
Tim

 

[alumi numb]

Re: Mercruiser 3.0 questions???

As an ex-aircraft mechanic I have to laugh at some of the posts about octane...the OCTANE is not going to burn your valves (and 120/100 octane aviation fuel isn't as high an octane as the "120" makes you believe...can you say just above 94 pump fuel?) Aviation fuel has a COMPLETELY different formulation than car gas though, that WILL cause some problems due to almost no vaporization, high lead content, etc...

CVBDREW: did you buy your high octane gas at a non-busy gas station? What can happen is when a person tries high octane gas, they buy it at a station that almost never sells it's high octane (due to no market, or too high a price, etc). What you end up buying is 2 year old, contaminated, LOW OCTANE gas (as gas ages it decreases octane). That would be my guess...too coincidental that the gas change would occur right as you develop an unrelated carb problem.
Tim

interesting, my 82 yr old father in law was a 35 yr aircraft mech, "denver and santa anna" ww2 vet greenland.
we ride bicycles ever day, 20 miles starting at 7a thus talk a lot.
he logged 5000 miles last year full panniers and stealth camps.
i only logged 3000 and don't have 12g's invested in bike's and gear.
the cool thing about a bike is octane doesn't mean crap.
just got my new brooks saddle.