DURABILITY OF 3.4L MERC

[CARLOS]

DURABILITY OF 3.4L MERC

THIS QUESTION IS FOR MERC 3.4L EXPERTS...<br />MANY PEOPLE RECOMMENDED ME NOT TO ACCELERATE THE 3.4L OVER 4500 RPM...WHY? THEY TOLD ME THAT DESIGN OF ENGINE IS ONLY PURE POWER AT LOW ENGINE RPM...MORE OVER, IF I ACCELERATE OVER 5000 RPM FOR MORE THAN 5 MINUTES MY ENGINE WILL HURT...BECAUSE... OVERHEAT, OR POOR LUBRICATION AT HIGH RPM´S.<br />I´M NOT CLEAR ABOUT THAT... I LOVE HIGH SPEED..<br />WHAT´S THE REAL SITUATION OF MY ENGINE?<br />WHICH IS THE LIFE TIME OF MY ENGINE? 1500 HRS? SAME LIFETIME OF OTHER ENGINE? EX 200 HP MERC?<br />I´VE SEEN THE INTERNAL BLOCK (CYLINDER WALLS) AND FOUND SPECIAL METAL COAT?(CHROME WALLS) THIS ENGINE IS DIFFERENT FROM OTHERS?<br />WERE CAN I FOUND ADDITIONAL TECHNICAL (TECHTIPS)INFORMATION FOR THIS ENGINE..<br />THANKS FOR YOUR KIND ATTENTION.<br /><br />SALUDOS DESDE VENEZUELA<br /><br />CARLOS S.

 

[CARLOS]

Re: DURABILITY OF 3.4L MERC

Re: DURABILITY OF 3.4L MERC

BUSHCAT, THE MARINE DOCTOR, WERE ARE YOU...<br />PLEASE REPLY...

 

[Kenny Bush]

Re: DURABILITY OF 3.4L MERC

Re: DURABILITY OF 3.4L MERC

Eduardo, take it easy.... I run mine wide open for miles in these Poker Runs on my lake... That 3.4L motor is the best motor Mercury has made, for durability. With 6 carbs on it, it is sometimes very tricky to get running smooth, but with that HUGE block, it can take a lot of abuse. I am seeing more and more of them around my area. When I bought mine in 1984, there were only 4 in Texas. The Mercury dealers around the Dallas/Ft. Worth did not even have factory manuals for it. I was forced to buy a set of Mercury Manuals ($430.00 US) and learn on my own. It does have chrome sleeves in it, but that is not a problem if you keep that motor clean by decarboning it often. I truly love these motors. When you sit a 3.4 block on the bench next to the 2.5 or 3.0 block, it makes you wonder how they get so much horsepower out of those little aluminum blocks. I have many motors in my fleet, and I have burned pistons out of the 2.5L(200, 225EFI) because they are much smaller and CANNOT take or disapate the heat as good as that big old 3.4L. I am currently trying to buy some used ones as I run across them. They are quite expensive to rebuild ($3000.00 in parts for complete rebuild plus 2 sleeves) but it was money well spent. If taken care of, I think the 3.4 lasts twice as long as the 2.5 (200,225,250). My 3.4 is currently on a 23' Chris Craft Scorpion Center Console (Heavy boat) and I turn a 23 pitch chopper style prop at a Maximum of 4800 RPMs, which equates to 62 MPH. I think 5000 RPM's is a bit much for this motor. You need to get a higher pitch prop to knock down a little bit of RPM's and you should pick up some more speed. The only thing that worries me is, you may have a problem getting parts down there(I am guessing). I can get everything here I need through the Mercury Parts Express website, in the States. Ebay has been selling some good and blown motors too. Anyway, Keep it clean and I will take you anywhere with your Hair on Fire.........