Mercury 2.5 Block 150, 175 or 200 HP Mercury 2.5 Block 150, 175 or 200 HP
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Boats and Motors

    Mercury 2.5 Block 150, 175 or 200 HP
from EdF  
7/8/2012 3:02:38 PM

Rated:

 I had my 2000 Merc 200 EFI rebuilt because of a blown power head. The same power head is used for the 150, 175 and 200 HP engines. What makes the same block produce different horse power? Thanks, Ed


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   Mercury 2.5 Block 150, 175, 200 from Mike1957 #11182 #11182  7/8/2012 9:41:10 PM
 I think all they do is bore the block out a little further and use bigger pistons.


   Porting, Exhaust from Rangerman  7/9/2012 9:48:47 AM
  the the computor fuel curve I think. Mercury also has 2.5 Promax that will light the Devils Tail. Had one for about 5 years. 6750 rpm and had the old Ranger flying low.

It was build the the Late Tony Reynolds of RPM Marine. Tony was the best hot rod Mercury man in the nation.

Edited 7/9/2012 9:50:15 AM


   Port timing, and on some years carb size. from Spookchucker #10778 #10778  7/10/2012 7:09:57 AM
 Pistons are all the same size, but forged on the 225 & up HP motors.
2.5 motors came in 150, 175, 200, & 225 with steel sleeves, and 245, 260, 280, & 300 HP with nichosil sleeves.


   Blocks........ from A.C. Hickie #10476 #10476  7/12/2012 5:05:55 PM
 I don't know the difference but I do know that there is an RPM diffenence. I had a 260 horsepower powerhead that came in a box and was rated to 7800 RPM. I never turned it that high but I'm sure that my boys probably did. Got some bad gas and scorched two pistons so we used the crank and few other parts to build another motor. Supposedly the same as 225 pro max (per my mechanic). The 2.5 block he built back for me looks exactly like the 260 block to my untrained eyes. I still have the nicsil block and 4 pistons if anyone is interested.


A.C.


   block from gilfavre  7/23/2012 12:24:01 PM
 how much you want for the 260 block?
how much damage?
my email is gilfavre@gmail.com


   2.5 block from Begafish  8/8/2012 9:52:15 PM
 the more HP you have the larger the intake and exhaust ports on the side of the cylinder, I think also the heads are miced differant...or shaved at differant tolerances


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