Merc 850's and 1075's-ARE THEY RELIABLE
 

A buddy of mine is looking at both of these. I couldn't give him any real world info, but told him I would get him some anwsers by posting on here. What is the difference in hours between the 2 before a rebuild is necessary. Is the 1075 as reliable as the 850 with more power or is it not even close from what I have read. Im trying to get him to go with some 700's, 600's or the 525's. He told me the 850's were just as reliable as the other blower motors that Merc builds. What's the concensious. Thanks Jeff

Regardless of horsepower, 850, 1050, 1150 ect... if the engine is built and maintained correctly, you will have no issues.

I respect your opinion, what is the average hours that can be expected from these two Merc Motors. Will the 600 and 700 be more reliable than the 850's. Thanks Jeff

GUYS GIVE SOME FEEDBACK...

U have a Buddy!!??:eek: :evilb:

Did you read any of this thread about them?


http://www.offshoreonly.com/forums/s...d.php?t=133541

not sure what Mercury wants for rebuild intervals, but on a 600 HP engine you should be able to go 375-450 hours depending how hard you run them. A 700, 350-400 hours. Again these figures are based of what I have seen with engines I have built. Even at these hours the bearings and such looked liked new. I have had 900 SC engines go the same time (roughly 300 hours +) The lower horsepower engine package will have a longer life before rebuilds. Alot has to do with maintaince of course.This is a good ball park.

I have many, but none in Michigan:evilb: :p :D Jeff

Thanks for the thread, I was also reading something similiar in this months PB mag. My buddy trying to tell me that 300-400 hours is not uncommon without a rebuild on the 850's.:rolleyes: Jeff

300 hours on a 900hp is pretty strong, excellent job.:cool: Like you said it's how it's maintained and how much you abused it over it's life cycle. Thanks Jeff

If ya send me that C note 4 a drink in Miami, I'll call ya Buddy!!!!:drink:

Jeff...I heard that the 1075 was a 75 hour rebuild. If you go thru Mercury Racing it will cost you about 25K a piece for them to go thru it. I don’t know what the local engine shope is charging for the rebuild. The 850 is a little longer, I am thinking 100 to 150 hours. Go with the 700 package... One year warranty and 700HP at the prop!

My buddies 42 gtx has 1075's one lasted only 25hours before it puked, Merc told him it would take 6-8 weeks to rebuild it and they where :D subbing it out to Sterling. He didn't want his season to be over so he purchased a spare!

These are the stories I have heard, not been very favorable. To be fair though, these were on all very , very, Hi-Perf. boats where they were entered in poker runs. We all know what the majority do on these runs, no different then my buddy would do. Jeff

A Complete rebuild on Merc 1075's is about $12,000.00- $13,000.00 each on average that I have done.

That's what Im trying to get him to do. But at 700hp it will take 3 to do the same as 2-850's to achieve simuliar mph. Actually 3-600's would almost be the same mph as the 2 850's, but he swore not to have another bravo boat. Hell, I personally would be happy with 2 stag. 700's, less maitenance, safer speeds for me, less ins. and so on. But that's just me, I'm the guy usually last getting to the card stops, :D Jeff

That's very fair:cool: , what about the 850's. Thanks Jeff

maybe it's just me but that is an insane amount to have to send every 75-100 hours or at least once a season depending on where you boat. I would rather spend the money with JC, dean or Mark or someone and not have the Merc name and get 200 hours out of them.

If you would get that boat finished you might not be last!:evilb:

If he would clean up that AZZZZ end also!:eek:

I thought you were doing that when you go down to Miami.:D

If you want to go to 1000hp, I personally would use somebody other than Mercury. Their engines seem to be nice packages, but I don't think that they are any better than any of the other well known builders. Also, Merc advertises their rebuild service for $24-25K at only 75-100 hours. Most of the other builders will do a rebuild/refresh for somewhere around $15K, given that you have not totally destroyed the engine. The big kicker is this though. For the other builders you can get the same power and get an honest 250-300 hours or more out of the engines if you take care of them.

Nope, Terry is go'n 2 do it!!!:evilb:

LOL, take a pic, I wanna C this 1

See the story in March Powerboat regarding the Merc freshen up. Gives all the details and specs and prices. Very good read...

ps to the above comments. Friends that have the 1075's are pleased by the fact that they always start easily, and will idle warm or cold and are very easy around the dock. Not always the case with some aftermarket builders...

$8,500.00-$10,000.00 It really all depends on what they need due to condition. Almost the same amount of labor is required. These prices include everything and all engines are dyno tested with warranty.

I was told from Performance marine that 1075's are 75-100 hours till rebuild, and the 850's are 150 hrs. Even though they may not need them so soon, it it not worth the risk to let them go longer, cause if they let go you will be looking at alot more cash to repair the damage..... Just what I was told.

Team CRC put a full race season on their 1075's and no rebuilds. Also did a couple of poker runs and the shootout on the same set of engines, and won the WC in OSS. I think that should be some testiment to their durability.

According to the Merc Racing rep, directly from his mouth, at the Miami Boat Show in 2006, the 850 and 1075 Mercs are recommended to be rebuilt every 50 hours at a cost of $25k per thru their program. They of course will err on the side of caution, reliability, and further business for Mercury. I doubt this is really necessary but that is Mercury's maintenence schedule for the 850 and 1075. If you followed it, they would last a long time.

This is very realistic. I agree.

Mercs tells you all this BS about the recommended HRS & Cost of this rebuilt Mercs tells you this but the real cost is about $78,000.00 for the set of rebuilt maybe out of all the 1075 out there 6 pairs have been rebuilt for the $25,000.00 like Mercs says.

I would go with someone like Zul's were you get 150+ hard hrs on his motors with out any BS.


This Is my .02

Rick OSG

Jeff,

I have a friend here in Houston who just picked up two naturally aspirated 1000HP engines. I don’t know the builder but he has gotten 300-400 hours out of them before. I can get more information if you would like.

Thanks but he wants strictly Merc.

LMAO:D I guess you have not had much influence on him yet!:eek:

You got that right.... Vyper motors and Arnesons:cool:

I am in this delima right now. I have been on the phone quite a bit the last couple of days so let me tell you what the Merc Rep read out of the manual to me. Valve train at 50-70 hrs, basically a topend, Total rebuild at 100-120 hrs.
As far as CRC goes, there are couple corrections there as well. First those were not 1075's , more like the 1200's that will be at the Miami show. I believe Mike is going to have a set in one of the outerlimits in the water. Yes they did make a full season, but they were freshened before the worlds in Destin. This is still pretty amazing the way they were run in CRC. Also the Merc rep told me that they required 110 oct, The rpm's would be raised to 6500, I am pretty certain that CRC was able to turn ALOT more R's than this though.:eek:
I am not saying all this to promote Merc. Just wanted to make sure everyone was on the same page.:D
Now my question for everyone since I need to make a tough decision myself. WHY would the mercs not last at least as long as any other builder with the same HP. They use very good parts, the valve train has been improved greatly from the 900SC, they have a Good fuel system and the electronics from what I have been told are very good.
Help, please.:drink: :drink:

merc 1075
 

whats the main differences between the 1075 and the new 1200, does it require higher octane, is it a 557 ci, costs, rpm's etc.

Yes, Outerlimits is going to have Pyburn's 47 GTX in the water with the new 1200's.

I have several friends with 1075's in their MTI's. 2 of them have had timing belt problem, belt tensioned problems plus an assortment of other issues. One of them just sent his back to Merc for Rebuilds. They have approx 125 hrs on them. The bill went from the origional quote of $45k to over $75k. These motors were not blown up either. This was a "maintenence" rebuild! For that much you could have bought 5 Kick A$$ long blocks!

I thought Bill was putting the BIG Vortec motors in.:evilb: :evilb: