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02-08-2005, 09:39 PM
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#1
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On a roll
Country: England
Location: Plymouth
Occupation: Anything in metal
Interests: Bristol Rovers, Cider & Boats
Boat name: Aqua Thunder, Badboy
Boat make: Bernico F2, Phantom 21
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Mercury 150
Couple of questions. What (economical) changes can you make to get as much as poss out of a Merc 150 Blackmax, ie swapping carbs etc etc.
Also would this be a 2ltr or a 2.4ltr engine, its a 1990.
Thanks
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All hail to Jail Ale
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02-08-2005, 09:45 PM
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#2
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hello
Join Date: Mar 2004
Posts: 2,739
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The 150 does have smaller carbs but I think the main difference between the 150 and the 200 is in the ports, particularly the exhaust ports. So no big gains really unless your any good at port work.
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02-08-2005, 09:50 PM
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#3
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Registered User
Country: England
Location: Birmingham
Occupation: Scratching
Interests: Big Dinners
Boat name: Never Enough
Boat make: Seaquel 600xs
Engines: 225hp Merc ProMax
Cruising area: Anywhere! I prefer Weymouth
Join Date: May 2005
Location: Birmingham
Posts: 3,232
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its the same motor I had dan. Its a 2ltr and I thought of tuning it up but in the end I sold it and bought the 225promax. The the cheapest easiest way!
I might sell that next year and go for a 2.5 racing engine in the 300hp range but I doubt I will! 70+mph its good enough for me!
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02-08-2005, 10:02 PM
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#4
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hello
Join Date: Mar 2004
Posts: 2,739
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Yep just had a look at S and F and I'm pretty sure its a 2.0litre. The 2.4 150 was called an XR4 and the XR6 150 was a 2.5.
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02-08-2005, 10:15 PM
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#5
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On a roll
Country: England
Location: Plymouth
Occupation: Anything in metal
Interests: Bristol Rovers, Cider & Boats
Boat name: Aqua Thunder, Badboy
Boat make: Bernico F2, Phantom 21
Engines: Merc 280efi, Merc 260efi
Cruising area: Worldwide
Join Date: Mar 2004
Location: Plymouth
Posts: 2,249
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Quote:
Originally posted by Johnny Boat Dude
The 150 does have smaller carbs but I think the main difference between the 150 and the 200 is in the ports, particularly the exhaust ports. So no big gains really unless your any good at port work.
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What gains would I get then by chaning the carbs and what carbs should I be on the look out for?
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All hail to Jail Ale
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02-08-2005, 10:18 PM
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#6
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hello
Join Date: Mar 2004
Posts: 2,739
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not alot to be honest you may even loose power unless you jetted em right. Jetting would be a pain too as what do you use as a reference and can you read piston tops?
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02-08-2005, 10:24 PM
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#7
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Registered User
Country: England
Location: Birmingham
Occupation: Scratching
Interests: Big Dinners
Boat name: Never Enough
Boat make: Seaquel 600xs
Engines: 225hp Merc ProMax
Cruising area: Anywhere! I prefer Weymouth
Join Date: May 2005
Location: Birmingham
Posts: 3,232
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sell it and buy a new engine!
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02-08-2005, 10:35 PM
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#8
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hello
Join Date: Mar 2004
Posts: 2,739
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For some small gains you could remove the exhaust can from the midsection possibly fit a 200 tuner as I believe the 150 one may be designed to restrict power and also remove the airbox. If you remove the airbox then either get velocity stacks or an intake plate like the one pictured or make one by cutting up the discarded airbox. The bare carbs don't flow much more air than an airbox as the flow is turbulent due to the sharp leading edges of the carbs.
If you do this jet up 2 sizes ie. 64' to 68's.
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02-08-2005, 10:37 PM
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#9
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hello
Join Date: Mar 2004
Posts: 2,739
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Notice the sharp edges on the intake of Burty's old airbox off'd 2.4 without the intake plate.
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02-08-2005, 10:57 PM
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#10
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On a roll
Country: England
Location: Plymouth
Occupation: Anything in metal
Interests: Bristol Rovers, Cider & Boats
Boat name: Aqua Thunder, Badboy
Boat make: Bernico F2, Phantom 21
Engines: Merc 280efi, Merc 260efi
Cruising area: Worldwide
Join Date: Mar 2004
Location: Plymouth
Posts: 2,249
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JBD, so by the sounds of it its alot of messing around for not to much end results then. Oh, well guess it will do for the time being then, stick a after market cowling on at some stage and at least it will all looks the dogs.
Cheers
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