Mercury HP1025/1200SCI
 

Hey,, Ive noticed the engine always says 1025/1200,,, but was wondering what has to be done to lower the HP rating...

Is this something that can be done easily? or are the other steps, such as changing the pulleys, that needs to be done...

Anyone know? ....:grinser010:

There are 2 ECM's unplug from one and plug into the other; 1200HP requires race gas.

I don't understand why they did that with so many 1200+ motors in the marketplace that can use 93 octane.

No 1200hp motors can use 93 Cat....

...for more than 10 minutes...

They would have to be awefully big cubes and bigger blowers. :coolcowboy:

Or........ just a couple of nice turbos!!!!!!!!!!!!




Darrell.

Hmm, thats very untrue. Just installing 2.9L sc's in replace of the 2.3, slowing the SC's down, same max boost level equals over 1200hp and will pass any durability test Merc could throw at it. Just lowering power consumption and temp, free power.

The Merc 1075 engines don't even have CNC ported heads and really are nothing special. 1200hp has been pretty easy to reach on 91 octane for quite some time.

91 is still just as hard to find on the water as 93 and if I have to pull out to fuel I'm going to put 93 in order to be on the safe side. I don't think the 5 cent saving once on the trailer is worth the risk.

And I would not run 91 in my 1050 engines if I can help it never mind if I had anything that pumped out 1200hp. But that's just me.

It sounds like Mini-Hawk's question was aready answered, but I have to agree with Dustin that 1200 isn't all that uncommon on 93 these days. Especially with turbos and meth/water injection.

From blowing up a lot of non mercury engines, I'd agree with GLH on 1200 hp needs higher octane. At least for supercharged engines.

My 1075's have efi and a lot of safety to prevent detonation and such. I feel comfortable with puting 93 octane in them. Any more hp then that I feel your playing with fire.
Also merc's hp numbers are conservative and the engines make more power then stated.

Outerlimits Powertrain 1375's make 1375-1420 on pump gas 93 octane. I have 85 hours on a set with only using race gas for the first fill up for break in and knock testing calibration, other than that 93 octane all the way.

My understanding was, that the engine management would take care of this. Never heard that you needed to change plugs.

Well, how about 1350 HP @ 6700 on 87 oct !!! It CAN be done. It's all about air intake temps.

598's with Procharger M-5's. HP went way up with 93, and over 1800 with 110. There are 2 prs. this set is in a Skater. :drink:

Those are bad azz!

The new merc 1350's run on 91!

I just came. :eek: :eek:

Every one i've ever been on you haft to manually plug it.

Seems like you might be talking about spark plugs.

If so, what he meant was that there are two engine computers. You have to unplug the engine wiring harness from one computer and plug it into the other to switch between pump or race gas.

All Good views...thanku guys....

Saw last year,, the Chief had a 1350HP/ pump gas ran 185.7 in a 388 Skater...

Keith built a set of 598CID,1200HP engines that run on 93 and have been very reliable. They are in a 44 MTI going on there 3rd season without any problems. Have not seen many 93 octane engines over 1200HP last one season in a boat. Not that it could not be done. The V16's are the only engines that we know of that can do over 1600HP on 93 octane mainly because your looking at over 1100CID.

I built my first 1200 hp, 93 octane engine about 8 or 9 years ago. I actually dynoed them on 91 octane, but never tried it in the boat. Always ran 93. After 2 seasons, we stepped them up to 1400 on 100 octane. They got freshened at 100-120 hours. I have since built quite a few pairs of them, the most recent in a 399 Skater V that I won the non-pro Top Gun award with at LOTO this year. They are actually made 1326 hp on the dyno, but I backed them down to 1229 hp in the boat. They have all been conventional head (no Big Chiefs) hydraulic roller engines. I am confident that 150 hours is possible. The longest I have taken one to is just over 125 hrs. and was very pleased with what I saw. I know there is more power to be had with Big Chiefs and a solid roller, but I would rather have the longevity and maintenance of the conventional heads and hydraulic roller. I'm sure there are a number of guys making over 1200 hp on pump gas. It really isn't that hard to do anymore.
Eddie

WildWarrior has a set of 1350's with meth injection that turned 300 hours this year, running on 93.:coolcowboy: