Planning to repower my 292 Fastech
 

Hello all,

Has anyone done a repower recently? I am looking to replace my engines and drives without having to do a lot of mod's...I have a 2001 292 Fastech with 140 hours on Merc 350 MPI's (300HP)-I would like to get some more speed, nothing crazy. I am curious as to my best option sticking with Merc, are the Scorpions a direct replacement? Will I need to change mounts etc???

Not sure yet if I will do them in my shop or have someone do it for me, I have not had much luck with getting quality work done in my area so I am leaning on doing it myeself but would appreciate any recommendations on a shop that provides good work-Southern NJ

Thanks!

There is a thread on here from someone who owns a 292 with Scorpions-its a solid 80 MPH boat if I recall. The issue beyond the cost is they require premium fuel. Look at the Illmor 6.2's 420 hp, regular fuel and a lot lighter. The other option is whipple chargers but you will need to do a bit of internal engine work to get the reliability. Either way I'm waiting for someone to pull the trigger and upgrade their power in a 292 as I'd love to do it myself.

Dave

I may just go with the 383 strokers from Merc. 350HP but a pretty simple swap out-do the 6.2's fit in there ok? It's tight already! I'll update once I finalize my decision.

merc has 383 mpi at 400hp also.

I repowered a 292 with carbed 6.2s. Used stock forged crank and powder metal rods put 10 to 1 pistons in and alum heads with comp roller cams. Best thing I ever did. 292 loves the power. You will need hydraulic steering and oil coolers. Starts to get expensive but what don't to go 80mph. Cruise at 55 to 60 and boat planned a lot better. I would stay away from 350hp merc reman 383. You will not see a lot of gain over 350 mags. The 400hp version is the way to go has scorpion intake and injection. That motor should put boat in high 70s. I would not supercharge 350 mag because of hypereutecic pistons. If you get detonation these pistons will destroy them selfs in a hurry. I know from experience.

I will look into the 6.2's more-any reason you went NA instead of injection??? Thx for the input!

Stock intakes on 6.2s/350mags are restrictive. Was told about 350 to 375hp max and computer is hard to hack. Only a few guys can tune it. I did not have money to spend on scorpion injection so went with big Es air gap intake and qwikfuel carbs. Only time I ever miss injection is when motors are cold. But after that carbs tuned right work great. It has been proven that a carb motor will make more HP than injection will but in real world with weather changes injection will shine on hot muggy days.

picture of motors in 292

RV-that is some pretty work-congrats, I'm with you on the carbs-Im building a 445CI SBF for my Cobra kit now and am going the NA route even though I could have gone with stack injection. Dynoed it last week with a Holley HP950 but didn't like the Air/Fuel ratios enough, my carb guy built a Quickfuel based on the data from the dyno so it goes back on tomorrow-last session it made 651HP @ 6700 & 581 LB @ 4600, hoping for more with the new carb and then it goes into my 2300# car!

I can't even find the 400HP Mercs-I called techline and they said only 350 HP now??? I agree that it aint worth the extra 50 HP, these engines only have 140 hours I can pull them and pretty ev thing up and save a lot of cabbage. What drives/props are you running?

mercury does not make the 400 horsepower scorpions anymore I have thought about building 2 427 small blocks with the dart heads would make a really nice boat but not sure I want to spend 30 grand

Cobra will be a rocket!! I am running stock bravos 1.65 ratio with 30p labbed bravo props. Turn motors 5500 to 5800rpm. Best speed cool day light on fuel nice chop 83mph. Runs 80 most days.

Haaaa-that will keep those damn 70 MPH waverunners off your back!!! This is my first go fast in a long time so Im trying to get back into it-I've been fishing for the last 20 years...a lot has changed since my Twin SBF 250 NOVA! I can't seem to get my boat past 60 MPH on the gps-this was with 4 in the boat 3/4 tank and beach stuff. I need to get props looked at and learn how to trim it out.

Take a straight edge run along bottom of boat and set drives and tabs even with bottom and mark your indicators at that spot. That is neutral trim. My 06 292 liked little positive trim (drives out) at all times unless running slow in ruff water. 292s handle poor with negative trim IMOP. Over trimming never helped me much just more prop slip. You should turn 350 mags 5k +RPM on big end. If not you are over propped. I would think 26p bravo 1s if you have 1.65 ratio drives? Maybe 28 labs that is what 6.2s pull?

http://www.summitracing.com/parts/drt-03124272 Here ya go, start with two of these. There has been many threads on 292s 5.7s VS 6.2s and the general opinion is that there is not a lot of difference in top end, the 6.2s just get there quicker. With the 350 HP 383's from Mercury you would probably see 73-74. You could also get a decent price for your engines so it would not be that expensive. Just not sure its worth it for only a few MPH. I have been thinking about the 427's set up right boat should see mid 80's. I have concerns about how that hull is going to handle at 85, and so does Formula I asked them. You will need hydraulic sterring, actually you need it now its night and day best thing I ever did.

With twin 6.2s the 29' Fountain will pull a bit over 70 with 100 gallons of fuel and one person onboard. (Not sure if the Fastech is about the same speed hull or not.) You might get +1-2 with labbed props. Mine are stock 26 pitch Bravos. No easy hop-ups for the stock 6.2s. It has been suggested above to build up some Dart 427 smallblocks. I would think it would be easy to get 425 h.p. with a mildly built 427. The Bravo drive should handle this. That ought to put you into the low 80s.

Thx ev one-great info and much appreciated, I am looking into the hyd steering, I hate the power assist that I have (or whatever it is actually called) so I'm def going to switch that. I am going to take the props to Atlantis and have them gone over-does 8300# sound like a fair operating weight? based on 50% fuel/300#'s of crap and 4 people? Dry weight 7000#'s-what is LWL on these 292's 27' I cant find it. I think I'll pull the motors and doctor everything up till it shines like new then have my engine guy do a little magic this winter:)))

Thx again!

Isn't Eddie Young from Young Performance Marine out your way. Bob Madera is in New York, a little drive, but both are very good.