350 MAG MPI upgrade kit
Black_Diamond
Member Posts: 5,439 ✭✭✭✭✭
look at this baby from Hardin Marine
Past owner of a 2003 342FV
PC BYC, Holland, MI
PC BYC, Holland, MI
Comments
cruisers and Most all other boats are limited by the hull. This means it won’t go any faster or slower.
faster is really 4-5mph per 80 horse
PC BYC, Holland, MI
Regards,
Ian
The Third “B”
Secretary, Ravena Coeymans Yacht Club
https://www.rcyachtclub.com/
6079 x2. 12g charger
8000 x 2. 16g drives
1000 x 2. 2g props
$30000
I'm sold glad I have all winter to set it up.
Got me a go fast 342.
if more power pushes you out of the hole and onto the pad of the hull quicker, and allows the boat to ride further back on the pad, there is less drag and greater speed. if you're talking a trawler, or a cruiser designed w/o a pad incorporated into the hull you'd be right- but Rinker's are designed as planing hulls, and as such 80 ponies are going to produce a lot more speed if it is properly propped as it cuts the water further back on the pad- providing dramatically less drag.
the prop is where the problems are going to happen with a boosted engine- especially a belt/crank driven (both roots and centrifugal varieties) charger... the parasitic loss down low returns with a vengeance when the engine breaks into the power band, which relates to needing a low pitch to get moving and then a much higher pitch to take advantage of the power- it would be hard to pull this off on a cruiser which likely won't respond well to having cleaver bladed props.
this rig WOULD help dramatically with either pulling boats (watersports) or work boats (carrying or pulling) as extra power is on tap and ready- they could turn a bigger prop up to the rotational assembly/valve train's capability at a lower load or w/o lugging the engine.
as a for instance- I ran a 4.3LX in a 212 w/21p three blade and could hit 44mph... I played around until i was happily at 45mph with the same engine and propped differently- but then dropped a 314cid (bored 305) in the same boat and with same RonHill Pleasure 5 19p / 14 1/8" prop, and which was somewhere in the neighborhood of 100hp stronger (but tq dramatically increased especially in low range) and sniffed 60mph. I promptly windowed that block... the 357mag (mercruiser factory built) in it now runs in the 55~59mph class (plenty of speed and all i need) using less fuel than the 4.3 and with more refined and wider TQ band, allowing better overall manners for every use i have for it.
I wouldn't want this 212's hull much over 60mph. it isn't designed for that. neither are the larger cruisers. sitting flat on the pad is the best place to be and most stable (read:safe).
Have helped install Pro-chargers and Whipple chargers in friends' boats. You have to be very very careful doing that with even a 350 Mag as you can blow it up easy. We never dialed-in the full boost - maybe 70% rated as the stock rods, valves etc. ( even on a 350 or 377 Mag) can't handle that.
Boost and its buddies will shorten the life of any non boost designated motor.
When considering boost or ANY HP it is essential to "build the engine" even - that is spend the same amount of money on enhancements on the bottom as you do on the top.
IMO
something that would be nice on a marine engine, i'm thinking, would be boost in the form of S/C (turbo is too tricky on marine gas engines due to heat and plumbing) that has a helm controlled wastegate or blow off- allowing the captain to allow the boost in circumstances that require it... this, of course, is directly related to my long held belief that speed gets you out of trouble at least as often as it gets you in to trouble if you're a reasonable operator to begin with. ... of course this could be accomplished with a 200 shot of gas too, and a LOT easier.
to you point, though- the valve train is the weakness, and would have to be dialed to allow much more than 4800~5200RPM- (likely up to 6500RPM to make best use) and the out drive will have to be beefed too in order to handle the greater RPM's/load at the prop.... valve train being fairly easy to do, outdrive being difficult.
there is a guy who actually went for broke to see how much he could get out of an OE built lower, and started with a 150k mile L33... he broke a valve off at north of 1400HP (crank)- thought it had full out blown, but realized while beginning the tear down what had happened.... he simply swapped out the offender and hooked it back up to the dyno and made several more runs above 1k hp before losing interest and moving on to the next project.
that is absolutely crazy to me, but then again having a street-able 'daily driver' car above 700 ponies was unheard of when i first started playing this game, too.
What kind of internals does the L33 have? All forged I'm guessing based on those HP numbers.
PC BYC, Holland, MI
PC BYC, Holland, MI
Think that’s a hydro gang plank?
It's a passerelle. Most European boats have them for getting on/off the boats. A buddy of mine had one on his 460 Prestige when my kids were younger. The kids used it as a diving board (an expensive one!
Dream 'Inn III -- 2008 400 Express
Those surface drives are cool. Really poor for docking, hence the bow and stern thrusters. Goes like a rocket I’m told...near 50mph. Very thirsty boat too.
PC BYC, Holland, MI