Blown Engine Poll
 

You can have a stock naturally apirated engine and have an engine problem once in your life, wich could be called normal.

This means, you could also have a blown engine (talking mild power here let's say, 400 to 700 hp) and have once in your life an engine problem related to the blower, whatever the brand ( whipple, procharger, vortech ...) wich also could be normal.

What I want to know is, how many of you guys, had blown engines, and ran into engine problem related to the fact that is it supercharged, for 2 times or more?

I'm just trying to see the general reliability of mild power blown engines...

and your comments on that subject!

I jsut bought a formula with 525sc's
because they are very reliable, blown motors
I plan to maintain them to death and keep them for a very long time.
I am unaware of any 525sc's that had any problems beyond possibly a value train spring issues that a similar cam'd 500hp might have had

seems when someone starts to tweak beyond a reliable scenario to get more power, they then run into problems


take my nitrous injected snowmobile engine for example
( don't ask) :(

Ramb

It's not marine related but I have the Roush setup on my Ford pickup went from 300hp to 450hp. Currently have 30,000 miles without any issues.

You won't even have the valve train issues. The cam is only .530/.551 lift and is a flat tappet so you don't have as high of spring pressures.

If you have not blown an engine...

Naturally Aspirated or Blown you either have just started Offshore Boating and are still pulling away from the dock wrapping up your lines or should go for a ride without your wife once and put the coals to it... :D:D:D

I've got 575SCi's with about 350 hrs on them
and they've been fabulous:D

Last boat had HP500's, 1 had a broken lifter,
and valve spring problems at 190 hrs,
after that was taken care of, they ran flawless
til I got rid of it around 425 hrs.

Most engine problems that I've had were due to the exhaust leaking water into the engines.

I'd rather have 750 hp coming from a warm engine with mild boost that 750 hp coming from a hot N/A engine. You'll have less issues. The bottom end will see the same amount of beating but the vcalve train will have to be more radical. You'll also have to deal with higher idle speeds, fouling, etc. The Achille's heel with blowers is fuel system problems that lean you out and smoke the engine.

I'm surprised (happy) that up to now, exactly 50% of people NEVER had any problem with supercharged engines...

honnestly I think it is a pretty impressive number!

Now I have to let the one who had problems the time to answer!

Right On!

I've blown up way more motors than I could count, BUT I've never had a motor blow because of the blower. Most problems are valvetrain related and as Lucky Strike mentioned, exhaust leaks can take a motor out real quick.

Kurt

I have torn up more then my share of engines but I have been known to run on ragid edge so when they tear up I am not surprised. Most, if not all of my damage is the cause of detonation.

would you call under 630 lift= 725 to 750hp not radical/ but solid roller over 700 lift radical/ or anything over 600 lift radical? just seeing whats radical to you guys, I have had good luck with the just under 630 lift in cams for 12yrs on 3 different motors now looking at hyd rollercam, head work and new intake and going from 670ish to 750ish I hope I have to much comp 9 1/2 to 1 for blower thought about a pro charger or 10/71 low boost. but I only broke one spring stud, and one loose posi lock on a 650hp motor and the other was when it had stock heads at 590hp posi lock came off valve got hit. thats it I had more troubles with my 330hp motor stock:D

Hp 500 efi, Vortech, 5 lbs. boost, 270hrs. No problems.

630 isn't too bad if you've got all premium parts in the valve train. 700 is radical. Plus, that 700 is going to come with a ramp profile that mashes those valves open, not a nice gradual one like on a hydraulic roller.

9.5 is more compression than you might find to be ideal. It's still workable. I'd look long and hard at an intercooler. Unless you are running close to 600 cid, the 10-71 is overkill. It's going to run so slow at idle you'll have fuel puddling issues. Aluminum heads on your motors now?