383 400hp Scorpions
 

http://www.mercruiserparts.com/400_scorpion.htm

Anyone put these in a 292 yet?Keep going back and forth about wether I want something bigger or not.If I decide to keep my boat a few more seasons I am adding Hydrolic steering and K planes after this season and was looking at these engines.Propped right,thinking 30s should see high 70s I would think.

One of my buddies had them in a 292 on Lake Lanier in Georgia and ran dead even with us at 72-73MPH at that time. Was a fairly new 292 boat maybe an 07 or 08...

And they were the 6000 rpm 400 HP? Would think it would be more than 3 MPH increase.

Yeah something doesn't sound right there. You should be able to net 70-72 with 6.2s. The 400hp motors running 91(mandatory) should be running 75-80 easy.

i have an 06 292 just got the 383 strokers installed. the only difference is i put the stainless marine exahsut because of the diverter system. the boat was just delivered this weekend, i have not ran the boat yet. BBlades took the 28 lab finished props and recupped them to see if i can turn at least 5800rpm. they think i might need 27's to get the 6000rpm. according to there computer they said i should reach anywhere between 79 to 81mph.

Keep us posted

Maybe they werent the Scorpion and just the higher output small blocks?

Dunno...

A lot of people call all 6.2s Scorpions because they are both 377 ci.

expensive date check my post i just installed the 383 scorpions in my 06 292

I saw that meant to let us know how they run.Just put exhaust on mine for this season but am planing some upgrades for over the winter.You did the steering already I think.Hope so cable steering is going to be a handfull at 80.
Who put them in for you and you used Stainless marine exhaust or the CMI headers that come with them.I blocked off the prop exhaust and went strait thru hull.Had to because the Imco would not work with the Y -pipe.

383 scorpions
 

stainless marine because i have diverter system, wanted to keep it quiet once and while. cmi would not work with corsa. have not run the boat yet. blood marine in lanoka harbor did the install. i will post pictures next weekm had somme powder coating done. hydro steering is next winters project. i hope the props work well

Looking forward to the pictures and seeing you out there this year.Do you ever go to AC on the weekends?

Expensive Date, got a few questions. Are you still using the Corsa muffler tips? How is the sound level at idle and on plane with the exhaust only running through the transom? Did you notice any effect on time to plane? Any top speed improvement?
Thanks,:drink:
Dave

As for the Corsa mufflers Mine has what looks like pinwheels in the tips.There are two of them I know that because when the boat was new both inside ones on the starboard motor came loose.I sent them to Corsa and they said they were not welded right.They did offered to replace them but I never did.
It is louder not a lot but noticable the engine starboard is a little louder than the port.Might take them out have not decided yet.
As for performance I had it out last weekend and was getting an engine alarm on the port motor so it did not get run hard.I should have it back this week.It should plane quicker as its probably 300 lbs lighter in the rear maybe more will let you know.If you do it CP performance makes really nice blockoffs for the prop exhaust.Will post some pictures when I get it back.

Thanks for the info. Sorry to hear about the alarm. Hopefully nothing serious. Looking forward to the results and pics.

They ran it with the computer on it today did it but is not throwing a code.I know its something stupid or maybe a coil.Hopefully its fixed tomorrow.

I just had an alarm on mine Friday. I have the SC5000 SmartCraft and it tells you the problem real time, but I don't know if it stores the code in the computer. It was the IAC (Idle Air Control) valve on my starboard engine (6.2 MPI). Exact same problem as I had last year on my port engine. These are the only two alarms I have had since owning the boat new and have 190 hours on the engines.

The IAC valve is a little stepper motor control valve mounted on top of the intake with two socket head cap screws right behind the throttle body. When you pull the throttles to idle the throttle body is completely closed and this valve controls the air going into the engine. If you notice the boat runs fine except at idle, this could be it. MerCruiser must have got a bad batch of IAC valves (I believe they are actually a Ford product...)

Got lucky and a MerCruiser dealer close to where I keep my boat had one in stock. $110 and 3 minutes of work later, she is running perfect again. :)

Good luck with yours!!

I ended up taking one of the baffles out so each tip has one.It sounds great but still legal maybe for some lakes its not but they really don't bother us for that here.
Time to plane is wayyyyyy better its has so much more power below 4gs and being 400 lbs lighter it comes right up out of the water.
Top speed is about the same but I had my props done last year by a local guy and the came back a little smaller so I think I am going to get new props and see what happens

What props are you planning to buy ?

What max. RPM are you aiming for ?

Boat ran 71-72 at 5150 when new when I got my props cleaned up by local guy(mistake) dropped to 67-68 but it did plane better so it was trade off.
Got new 28s coming from BBlades with the lighter weight so still plane better and put me back up to low 70s

Thanks for the info. How was it mounting the shifter bracket and ECM with the IMCO exhaust? Pretty clean install? Pics would be great if you happen to get a chance.

400 lbs is more than I would expect. Each stock manifold is 100 lbs heavier than an IMCO? Thanks again.

I weighed them when I came home a stock manifold and riser is 76 lbs.The Imco manifold is like 10-15 they are very light so its more like 250 lbs but at the very rear of the boat that is still a lot.
You can get (you need) brackets from Imco they are different for shifter and ICM.The bolt to the riser studs.The ones I got tilted out to much but if you bend the before its real hard to get the rear riser bolt its tight.So I just covered the riser in a thick rag and bent them toward it with a big pair of channelocks after they were bolted on.If you don't the shifter and ICM bracket will not clear the valve covers.I did have to re drill one of the holes for the ICM and you only use two bolts for the shifter.And the manifold bolts that Imco sends are a little two long especially on the first and last port.Use the old ones on them and double washer the rest even though the seemed fine.

I tried to post pictures but they are to big will shrink them latter but I have a lot to do tonight if you want PM me your email and I will send them to you

You're right, 250 lbs is still a lot of weight and that swap takes it off the right place. I imagine rough water handling may improve a bit. I know my 292 feels a bit tail heavy in the rough. PM sent, thanks.