Merc 496 MAGS
 

Other than being on the low side of power what if any issues is there with these? How many hours are they good for if well taken care of?

I know they are somewhat gas sippers in a sense too which is always a plus but not anything I was looking for. Just an added bonus.

I have almost 400 hours on mine with zero issues. The only thing I've done to it was replace the IAC valve a couple weeks ago because it sounded to me like it was cycling too much at idle. These motors make a ton of torque so they are good for heavier boats.

Ya the boat is question is a heavier boat.

I wouldn't be the fastest in the water but it claims of upper 60's and that is fine for us. Especially being our first offshore boat. The best part is it's LOADED with extra's and we ar the type to take a few friends out and hit the island for fun so it would be nice to have all that on board.

Just didn't know a whole lot about that power plant and it's the first boat I looked at that had them. Good to hear they are soild which is really what I am wanting more than anything.

I heard after 4000 rpm they can be a bit weak and take a while to get back up to top speed in compairision to say a 500 or 525 but that again is ok with us. Most use will be at cruising speeds.

Yes, they just don't have the camshaft to pull really hard over 4K RPM. The closed cooling will be a plus since you boat in salt water.

Have a 496 in my Velocity and it has enuff power to run it to 74 MPH on the GPS. I believe we just turned around 450 hours on ours. Still running stong. I'd say the biggest turn off is it is an ugly motor to look at (as all merc black motors are).

Yeah...not much to look at, however it's a horse and starts every time. You'll be on the water more than many others.

This is my overall goal. It's always nice to be up front but I will take finishing every time over that.

Ya I agree they are blah at best to see. I think the hatch with stay closed a bit lol.

Is there a set of stainless manifolds for them that are worth the money? Or are they better left alone?

I think there are some gains to be had, maybe somebody will correct me if I'm wrong, but it won't propel you into the realm of a blue motor or similar. When I had mine, I just left it alone, a couple of mph vs the cost wasn't worth it to me. I guess I always had the opinion that if I wanted a decent increase in speed I'd just purchase a purpose built motor.

I had the 496 for 3 years and never stayed off the water for motor reasons.

It would be to break that mental 70mph mark and add some sound as we don't have a noise law so louder the better lol.

But if it was a heafty cost I would leave it as is.

I'm not sure about the MAGS, but some of the HO's have valve train problems. I had one motor with only 210 hours and it broke a rocker arm and bent some push rods.The valve springs were weak. These motors were never run hard either,almost all of the hours were under 3000 RPM's.I have also put over 600 hours with some pretty hard running in my previous boat with no problems. The engine ran the same as when it was new when I sold it..

Dollar for dollar, the whipple stage II PCM flash (IMO) offers the best performance upgrade. At least it did in my boat. The Velocity hull responds very well to small HP increases..... The PCM flash, gave me a huge lift in mid-range torque and maybe 2 MPH at WOT. Some will argue the PCM flash doesn't help at all. I think upgrades will all depend on the hull. If you are going with a heavy boat, I would suggest just leaving the motors as they are and just enjoy the hundreds of trouble free operating hours the 496 has to offer.

Ya It's an 8400 lbs dry boat with twin 496's and a top speed as is of about 68mph.

I would love to break the 70 mark but it's not a must at all and don't want to spend thousands on thousands for a very minimal gain.

What kind of boat Nate?

Sonic 358

Nice boats.

I loved it when I was looking at it crawling all over. Lots of great features, great lines, and very clean.

Awesome. Hope it works out for ya.

Change the cams, ECM programming and drill the TB and make them HOs. Around 100 hp.

They say "496 MAG HO" on them. Not sure if that's different.


http://i43.tinypic.com/10441v7.jpg

Sorry, thought they were mags, NOT HOs.

Seems crazy the boat is that slow. I have a PQ with same power and will run 80. Weighs a bot more too.

I am only going off what I was told. I have not ran her yet at all.

Just FYI, I have 900 hrs on mine, and my buddy has 1100 hrs on his - still going strong. I agree with all the comments: they sip gas, are a little slow getting from 4,500 to 5,100, but turn the key and they go reliabily. I would be careful about adding after-market exhaust or super-chargers, unless that extra power is worth the headaches of breakdowns.

For us..no it wouldn't be. The turn key means more to us at this point.

If anything it was a set of headers and maybe the pcm...no super chargers though. Either way if it added a lot of issue for little gain then I will put my money else where.

Looks tight, that impeller change is going to be a toughy.

I thought it was ok to work around.

Heck compaired to the 32 fountain...I could have a party in the Sonics bilge lol.

So you have MAG HO's instead of just MAG's. Nice! Leave them stock, turn key, and enjoy!

This was kind of what I was looking for. Thanks!

I was not sure if there was a difference and I now know there is. Hopefully the survey goes well here very soon and I can get her on the water and see what it can do.