phil0460

definently not the case by us

Edward R. Cozzi

I have two engines in the same boat acting up!

Most marinas around here have at least one messed-up 6.2 sitting in their shop gathering dust and rusting away.

Trust me, you are NOT the only dealer having trouble with these engines.

4mulafastech

What year 6.2's are you seeing problems with? I have 100 hours on my twin 6.2's in a 8000 pound 2006 Formula 292 Fastech. Run them really hard and not a lick of problems.

Looks like they have improved the exhaust design to prevent water getting into the engine...

Knot 4 Me

Piston design most likely? Don't stroker motors in standard blocks have to go with shorter length pistons? That means the wrist pin and ring lands are all bunched up closer together. Where are the pistons breaking? Pulling the wrist pins out of them? Breaking around the rings?

baja02

I have 2 of these 6.2's in my 2002 baja outlaw..328 hours I run mercruiser part synthetic oil and change it every 20 hours..No problems at all except the IAC valve's went bad on each engine once....No unusual noises..They run smooth , powerful....I recently change the stock exhaust to stainless marine...The cast iron 5 year mark where they start to rust internally, then engine problems...so far i'm happy..better fuel mileage...I run them at 3500 to 4000 all day

Michael1

Remember that even with the same pistons, the piston speeds are higher in the longer stroke 6.2, which increase forces on the piston. Interesting thread.

Michael

K5_Guy

Man, this makes me a little nervous, since have twin 6.2's and couldn't afford replacing them if they failed. Is there anything to look for, what do I need to look at as far as rust in the exhausts? I have 500 hours on them in an 01 Chaparral 285 SSi.

rhsj2006

Yikes, don't scare me, fellas...I've got 195 hours on my '03 FasTech 292 and an engine failure would keep my boat dry for a longggg time.

During which I would rip out both engines and rebuild with hardcore internals, make those mouse-motors roar.

unbroken

That is exactly what I did, and they really scream as 383's. The internals are pretty good to start, in the early 02 model year engines atleast. Re grind on the cams, 1.6 ratio rollers, and stainless marine exhaust, and they spit out 352.1 HP at the prop shaft in Bob Lloyds shop.

rhsj2006

Nice, and this is something I want more info on if you don't mind:
*You say 383 C.I., factory I thought they are 377 C.I. Did you bore for the extra displacement, and if so how much?

*Regrind on the cams meaning same cam re-used with new lobe profiles? Or new cam altogether? If new cam, why go with 1.6 rockers instead of just using a higher lift cam? how does that effect valve speed?

Is reversion a concern with the new grind and 1.6 rockers?

Was the 320 HP rating from Mercury at the propshaft or crankshaft? If it was at the crank, any idea what the difference is from your stock motor to 352 @ the propshaft?

Finally, the big question: How many MPH at top end did you gain?

Thanks in advance...