Quote:
Originally Posted by spareparts
whats wrong with the powerhead you have now?
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If it ain't broke? . . . You know!! The motor you have is a great engine!!!
Here are a few things to consider.
1. you'll be lucky to get the old powerhead off the mid-section.
2. There's not too much power difference b/w a 175 (vertical reed 2.4L) and a 200 (horizontal reed 2.4L) . . . 175 and 200 use the same block with a different front half, exhaust tuner and carbs. an 88 200 might have the 1pc. heads, but it's still essentially the same engine as the 175.
3. Fuel economy is worse (although not bad) with the 2.4L 200 depending on which carbs wh-31's, wh-28's, wh - 22's, wh-20, but all the larger verturi carbs are worse on fuel than the small venturi carbs on the 2.4L 175.
4. 1992 and later 200's used the 2.5L block which has behind the liner porting. 2.5L merc's are STRONG motors, but they like fuel a LOT more than the 2.4L motors.
Ask MJ about his fuel economy with a 2.4L 175hp (2:1 ratio lower) pushing his 23 SeaOx with a hardtop.
I run a 1979 2.4L 200hp vertical reed (essentially the same motor as the 175 (without fingerports) ) and I get 3.5 mpg up to 4200rpm almost all conditions pushing my 20 seacraft seafari.