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  LHG....Merc 200hp question

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Author Topic:   LHG....Merc 200hp question
Bigshot posted 06-24-2004 02:18 PM ET (US)   Profile for Bigshot   Send Email to Bigshot  
Bud just bought a 1997 22' Concept with a very clean 1993 200hp Merc 2.5L offshore. Engine has nosecone and some sort of exhaust port about 6" above AC plate facing aft(to make loud). Question is the engine looks to be all original and I told him about head gaskets. What else maintenance wise should he do(thermos just done) and what is the redline on this beast? It has 2 props, 1 is a 21" Balistic but only yields aout 5100 trimmed with 3 adults and empty fuel. Other is a 4 blade Merc prop which I did not check pitch that will hit 6k. We are gonna try my 19" mirage & a 20 Laser 2 which I think is gonna be key.
Buckda posted 06-24-2004 05:08 PM ET (US)     Profile for Buckda  Send Email to Buckda     
Biggie -
Be patient...LHG is out of town until late next week and may not respond until then.

Dave

linust posted 06-24-2004 08:07 PM ET (US)     Profile for linust  Send Email to linust     
By AC plate, did you mean AV plate? Mercury V6 outboards have an exhaust port in the lower cowling...is this what you're referring to?

Only maintenance issue I had with my 135 besides regular water pump impeller replacement was the clear plastic oil line in the oil injection system--as it ages, it cracks, leaving a nice mess in the lower cowl--fortunately, I caught it before it managed to drain the oil reservoir.

Redline for the 2004 200 classic 2s (2.5L) is 5000-5600, or if 200 EFI, 5000-5800rpm. From what I can tell (various brochures and owning a 135 2.0L V6, 220 Laser 2.4L V6, and the books for them) these rpm limits changed much over the years.

As for props, I think the Mirage is the most advanced of the ones you've listed, especially if the engine is raised a hole or two. They are larger than normal diameter, so you get great holding power. Try playing within the Mirage line if you can, seeing how the 19" compares with a 21" As for the Ballistic, when I compared a 19" Ballistic vs 19" Mirage, I picked up 400 rpm--I attribute this to 1) aggressive cupping on the Ballistic and 2) less than peak performance from my old motor. Obviously YMMV.

TampaTom posted 06-24-2004 11:32 PM ET (US)     Profile for TampaTom  Send Email to TampaTom     
Hey Nick,

My 97 Merc 200XL says "Max RPM 5800" on the sticker. Lot's of interesting stuff on the Scream and Fly Tech forum. Carbs clean?

linust posted 06-25-2004 01:13 AM ET (US)     Profile for linust  Send Email to linust     
oops...
quote:
these rpm limits changed much over the years.

should have said
these rpm limits haven't changed much over the years.
Bigshot posted 06-25-2004 12:01 PM ET (US)     Profile for Bigshot  Send Email to Bigshot     
She runs like a banshee but I will insist he runs some Techron/B-12 through her anyway. Good note on the oil injection lines, will check those and fuel lines. I have some old Merc brochures which should tell me 56 or 5800. My buds 1985 200 was 5800 I believe but he constantly ran it at 6-6200 and she eventually delaminated a cyl wall.
Bigshot posted 06-29-2004 11:13 AM ET (US)     Profile for Bigshot  Send Email to Bigshot     
bump!
LHG posted 06-30-2004 09:16 AM ET (US)     Profile for LHG    
I'm out in Greenport, LI, NY, and am looking forward to meeting Bob Mills in about an hour and seeing the Mills operation. Managed to find a computer out here! This is beautiful country out here. Highly recommended to anyone, and well worth the trip, and the boating looks fabulous.

Anyway, Nick, by the description of that exhaust port, it sounds lke your friend has a racing Merc, a 2.5 EFI Offshore? Does it have a completely different sound than the "recreational" models?

If so, that's a 260HP engine, and revs to 7500-8000. I think it needs premium gas also.

I have no experience with these engines, but I would have a
mechanic who knows the racing models go over it. I hear they require more attention than the regular engines.

Bigshot posted 06-30-2004 10:53 AM ET (US)     Profile for Bigshot  Send Email to Bigshot     
Not a high perf motor Larry, just had a couple mods done. Powerhead and cowling are stock 200 2.5L 1993. It may have Boysen reeds, etc but internals are all stock.
Bigshot posted 07-06-2004 04:09 PM ET (US)     Profile for Bigshot  Send Email to Bigshot     
Well...going in this week for a carb cleaning, water pump, oil change, plugs, etc. Put about 10 hours on her and she runs great, just idles like she wants to rip itself off her mounts and gets a tad warm when run hard.

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