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Author Topic:   Mercury 150-EFI c.1998
pierre posted 01-10-2006 10:57 PM ET (US)   Profile for pierre   Send Email to pierre  
I'm thinking of buying a 1998 Mercury 150-EFI with 25inch shaft for $ 6,750-Canadian Funds.

Are those Mercury 150-EFI good? Reliable? Fuel efficient engine? For that kind of budget, about $5,000-US?

bsmotril posted 01-10-2006 11:18 PM ET (US)     Profile for bsmotril  Send Email to bsmotril     
They are strong, solid, and reliable. But, I would not call them fuel efficient. They will be a little more economical than a two-stroke from idle to about 2000 rpm. Beyond that, not much improvement over a carbed motor, and certainly nothing like the economy of an optimax, DFI, or four stroke.

Expect about 15 gph at cruise, around 22-24 WOT.


Peter posted 01-11-2006 07:28 AM ET (US)     Profile for Peter  Send Email to Peter     
Bill -- A 150 EFI burns 15 GPH at cruise and 22 to 24 GPH at WOT? Seems a bit high for a 150. I would have expected something more like 8 to 10 GPH at cruise (4000 RPM) and about 15 to 17 GPH at WOT.
assaf posted 01-11-2006 10:47 AM ET (US)     Profile for assaf  Send Email to assaf     
I had a 1999 150 EFI installed on my 1996 17 outrage II.

I had the boat for two years, used it in salt water, and didnt have any problem with the engine.

It was a very strong boat/engine combination.

At cruise 3300 rpm 25mph about 7-8 gph.

Tom W Clark posted 01-11-2006 11:28 AM ET (US)     Profile for Tom W Clark  Send Email to Tom W Clark     
I agree with Peter. There is no way in hell a 150 is going to burn 22-24 GPH at WOT.

My own 1989 Mercury 150s (carburetors) burn about 8 GPH at 4000 RPM and about 15.5 GPH at 5500 RPM (WOT). I would expect the EFI version to burn less fuel than that at those speeds.

bsmotril posted 01-11-2006 12:59 PM ET (US)     Profile for bsmotril  Send Email to bsmotril     
You guys are right, the numbers I quoted were my experience from running a twin engine installation, not a single 150. Good catch. BillS
sosmerc posted 01-11-2006 08:51 PM ET (US)     Profile for sosmerc  Send Email to sosmerc     
Keep in mind that the 150 EFI Merc is a 2.5 litre block...not the 2.0 litre block like most 150 Mercs. So the fuel consumption at WOT is going to be more than what we are used to seeing on the 2.0 litre models.
The 150 EFI even uses a 1.87 gear ratio instead of the 2:1 ratio on the 2.0 litre 150.
They were really popular with bass boaters due to their extra responsiveness and good top end power.
timing posted 01-12-2006 07:05 PM ET (US)     Profile for timing    
Experienced with a 1998 200 efi.
2.5 block has an excellent reputation.
150hp is an easy output for that block.
If run properly, high confidence that engine will deliver
strentgh, reliability and a long life.
The efi will have far better
cold start and throttle response vs carbed engine.
Idle - low rpm running characteristcs much closer to a legacy carb motor vs modern dfi.

pierre posted 01-12-2006 08:13 PM ET (US)     Profile for pierre  Send Email to pierre     
thanks guys, the dealer seeling that engine says that the previous owner ran it only for about 100hrs.

If he's right what king of compression are we looking at?By the way the cover of that 150 says on it side OFFSHORE supposely meaning that it's because of that extra long shaft(25 in).

LHG posted 01-12-2006 08:36 PM ET (US)     Profile for LHG    
Here you go: (1997 200 EFI Offshores) current=7269006-R2-006-1A.jpg

Mine have been excellent, now with 1800 hours. The 4 year extended warrantys I paid a total of $2700 for was a waste of money.

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