I like the procharger VS whipple because you can stay out of max boost while cruising. I don't think I've ever heard of anyone using a whipple and not having to rebuild after a season or two... prochargers though you can get everything to last if you are gentle on things for the most part and open it up occasionally.

Ive got 4 seasons on my whippled 496 cruising at 3500 rpms it doesn't even budge the boost gauge.

With a Whipple or Roots, you would not be at max boost while cruising. I don't know where you got that info from but it is incorrect.

With a positive displacement supercharger, your boost comes in relative to throttle position. For example, cruising along at 2800RPM, you may be in vacuum. Then you nail it wot, boost shoots to pretty much its max its pulley'd for. This is why whipple and roots have been used 10x over procharger in marine applications. No lag, no need to build rpm to make boost.

in regard to drive life, the procharger will be easier on drives, because of what I posted above. With a roots or a whipple, you just cant whack it, because it will go into boost and make tons of power down low. You will have to go easy on the throttles.

there is no doubt you can make big HP numbers easily with a procharger. Simple reason is the cool charge means you can throw a lot of boost at it. Lots of boost means you can overcome the ineffieciences of the engine, and make power. With a roots ,you actually have to build a engine under the blower to make big power, because you simply cant throw a ton of boost at it due to the heat the roots makes.

IMO, Ill take a stout engine with low boost making 1000HP, over a inefficient high boost engine making 1000HP for a boat any day.

So many variables when it comes to supercharging. One guy can build a 502 that makes 1000HP. The next guy builds a 598 that makes 1000HP. The guy with the 502 says ''HA!! My 502 makes just as much as your 598 you dummy!!'' But, the difference is the 598 build is doing it with 7lbs of boost, where the 502 guy is doing it with 12lbs of boost. Which engine you think will last longer with all else equal???

This is where a screw blower like a whipple shines. All the benefits of a roots, without all the heat. As for a whipple causing a rebuild every year, that's poppycock.

That my friend is one hell of a post loaded with useful information for people like myself . Thank you .

Thanks bud. Not trying to debate what blower system is best, everyone has their own needs, wants, budgets, etc. All 3 style of compressors work well when used and setup properly. .

Just trying to clarify any confusion about a whipple being in boost all the time, requiring rebuilds every year, etc. :bong:

I also read that theblowers and whipple type had to be sent out every year or two for rebuilding.

Step away from the pipe !!!! :bong::bong:

Just curious were you read that? because that is completely untrue

VetteLT193 Said he never heard of anyone NOT having to rebuild every year with a whipple.....I think he needs to take off the earmuffs and step out of the bubble. :poopoo:

It was on a old thread about 575sci motors. I was looking at a 36 with them at the time.

I did beef up the bottom end, but it lasted 5 years as stock efi500 and 5-6psi before I did. My ECU is custom via the boat and an air fuel meter, the only way I would suggest.

I see just a touch under 90 with a 540 and 7psi, 28' Nordic, 1.36 gears at 5500 and a 28P bravo.

My buddy and I have same boat, he has whipple, I have vortech. There is so much mis-information out there it's crazy. We both come into boost just around 4000 rpm.

If you have a vortech, you don't need to "wait for rpm" to get the boost to "kick in". Just like the Whipple isn't making full boost all the time.

If we we both cobbed the power at 3000 rpm, totally in vacuum, we would both get to the other end of the lake about the same time.

There is no waiting with either one, the power comes on, RIGHT NOW.

This is rarely getting over 4000 rpm on this video. Plenty of power on tap. 540/7psi, 28' Vortech

http://www.youtube.com/watch?v=PhHfwyKf5E4

i have a 38 scarab avs with m4's on 540's and have had nothing but problems with the drives. motors have been great make alot of power, but i keep blowin up drives. imco sc's cant hold the power on this heavy boat. upgrading to SCX with sc lowers. only issue i am having is its running way and i mean way to rich. running 850 quick fuel blow thru carbs and they just arent rite. going to 750 pro system blo thru carbs. whats everybodys thoughts on going back to 1.5 ratio on new drives. guy with a 42 fountain with same motors says it helped his motors a ton with putting all the load back on the drives instead of the motors. he is running 13-15lbs. of boost i am going to stay with 5lbs.boat is fast enough. 107 is fine with me, just want more reliability with the whole package. any feedback would be appreciated! thanks

Save yourself the headache, spend the extra $ and buy Whipples.
They dont rattle, they are WAY more efficient, the intercooler isnt a box on the floor..etc.Not saying Prochargers can't make a lot of power, but its doing it the hard way.
Thats going to be my only post because I know the posts that will follow. If you want more info PM me.

I love my prochargers. Zero issues after 220hrs 7psi. Talk to someone like ben at precision power offshore. An EFI might be the answer. I have drive issues also but any high hp boat will. You should consider the complete imco scx for full strength. Arneson bravo conversion is n ice also and overall the best bang for the buck.

arneson are twice as much as SCX's. i already have the lowers so the best price i have had is 10,300 per side. Thats the SCX upper, new helmet,coupler to bolt the lowers onto the uppers and the larger drive reservoir because they hold so much more drive fluid. arneson bravo conversion was 23500 a side and thats not installation or props. arneson would be well over 50,000. SCX will be half that. i also love my prochargers i cannot justify spending all that money on whipple's when i already have this system. so, looks like im buying imco SCX! get the fueling issue delt with and i will be back in action in the spring how often do you need to change the impellar in the procharger blower??? i have been told every 2 seasons.. i LOVE the way these big m4 sounds!!!!