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Discussion Starter #1 (Edited)
I just bought a 22 schiada and it has a 509 with 871 Blower. Do you guys have any suggestions on boost, bigger blower, intercooler, etc to get more power? The boat runs high 80's low 90's weighs alot and I would like to get a few more MPH out of it without sacraficing the realiability it has had over the years. The motor has been in the boat since new 1995 and has never had problems. Here are the motor parts.
Merlin Block
Dart Heads
Lunati Blower Crank
Oliver Rods
JE pistons
Hydraulic Roller Cam
Weiand 871 Blower
2 CJ Engineering 750's (2 fuel pumps Electric and Manual)
My boost gauge currently reads 12-13 PSI so I only have put race gas in it. The water temp runs around 140-160 cruising then bumps up quick to 180-200 when im on it. Here are some photos. Oh yeah I took off the old powerflow exhaust and bought some new CMI Sport tubes already but havent run with them yet.
 

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Looks like a real nice boat i would leave it just the way it is
it takes a allot of hp to get over 90 mph in a schiada.
that's a pretty respectful speed.
 

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I agree with Hallet above was told 1000 hp = 100 hph in those boats. the water temps seem to high for a blower motor. can't tell if you have alum heads. they help disapate heat on boost. I run water temp 120 and 140 max to help with detonation. an intercooler would be a good thing. i run richard lee's but the blower shop make a good one for less money, and the cores when you need them are about 1/2 price, if you buy one get the coper-nickle lasts much longer than alum. also what is your inital compression ratio?
 

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Discussion Starter #4
8.5-1 Comp Ratio. The heads are aluminum (Old Darts) I am guessing the motor is running about 800-850 power wise and the boat weighs 4200 pounds, more when fuel is full (2 40 gal tanks) I am thinking about leaving it alone except for a good intercooler. What about the low profile whipple?
 

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Discussion Starter #5
Looks like a real nice boat i would leave it just the way it is
it takes a allot of hp to get over 90 mph in a schiada.
that's a pretty respectful speed.
You didnt leave yours alone?? LOL I think leaving it alone is what I am going to do. But I would love to go bigger on the blower with an intercooler. I beleive you are doing the same thing.
 

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I was just thinking with your boat being a stern drive you
might want to keep the motor you have if you go big
you will have problems keeping the drive together
i have been there when i had my two Hallett vectors.
sure is a nice looking boat. :)devil
 

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Discussion Starter #8
Even with a stern drive they are not fast without alot of power. The boat is super heavy. I guess Ill leave the power alone until I can afford Max Machine billet drive.
 

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the 8-71 isn't to bad for a pleasure 509" piece.
What i s your overdrive to get that boost? The weiand blower is..well how do I say this..it has its place. It is not a horrible piece. It is a production piece..yea, that is a good way to put it.
Intercooler...they make power..well sort of. Most guys that dyno the intercooler stuff say they are good to 75 ish hp. Is that worth the hassle to you? and $$$
I'd run it, enjoy it, and be happy.
Wags
 

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Discussion Starter #10
the 8-71 isn't to bad for a pleasure 509" piece.
What i s your overdrive to get that boost? The weiand blower is..well how do I say this..it has its place. It is not a horrible piece. It is a production piece..yea, that is a good way to put it.
Intercooler...they make power..well sort of. Most guys that dyno the intercooler stuff say they are good to 75 ish hp. Is that worth the hassle to you? and $$$
I'd run it, enjoy it, and be happy.
Wags
It is actually a mooneyham. I just bought a littlefield 1071 with a intercooler 2 850 CJ's and some CMI sport tubes. Hopefully this setup will give me the same HP at about 8 pounds of boost instead of 13.
 

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Hey BRO...Leave it be...That is a smoking top end for a cool ass, heavy river boat that you can fit some people and a full size cooler with room to spare. Thats the smart ticket. Nice ride!!!!


"The General"
 

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Or?

Sell me that setup you have then tell me where I can find a twin..HAHA Whats up mike? When you goin out next? Hit me up...Bryon
 

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Discussion Starter #15
Shit! Whats up man? Ill be out this weekend with some new additions to the boat. 1 hint! I had to ditch the engine hatch.
 

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Leave it. You got a bitchen ride with very respectable performance AND....... it's reliable. Spend the money on fuel and maintinance and enjoy. There is always going to be someone faster anyways.

Just my 2 pesos.


BTW Congrats, it's a beautiful boat.




Darrell.
 

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Discussion Starter #17
Leave it. You got a bitchen ride with very respectable performance AND....... it's reliable. Spend the money on fuel and maintinance and enjoy. There is always going to be someone faster anyways.

Just my 2 pesos.


BTW Congrats, it's a beautiful boat.




Darrell.
Thanks Man! I actually had to run on race gas before the mods now i can run on pump. Really did not bump the power just added some shiny parts. The boat runs high 80's low 90's and has about 900hp. If I go higher in power ill be buying new drives every week. Again thanks for the compliments. BTW this weekend I will be testing new cav plates on the drive made by riverdave so maybe Ill pick up some performance with this mod and hopefully cure my porpoising. (Or however you spell it)
 

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yo

you try those out before i buy some so that i know they work. Im with ike right now he said whats up. hes commin out this weekend tooo
 

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Thanks Man! I actually had to run on race gas before the mods now i can run on pump. Really did not bump the power just added some shiny parts. The boat runs high 80's low 90's and has about 900hp. If I go higher in power ill be buying new drives every week. Again thanks for the compliments. BTW this weekend I will be testing new cav plates on the drive made by riverdave so maybe Ill pick up some performance with this mod and hopefully cure my porpoising. (Or however you spell it)

Rght on. It's nice to be able to just pull up to the pump and fill. You ain't kidding about the drive, it really is the weak link on I/o boats. At the hp you are at, it's alread near the limit, no make that AT the limit. Putting a new one in every year would be no fun. What speed are you getting the porpoising at? Any tabs?


Darrell.
 

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Discussion Starter #20
I get it at all speeds if I dont run the cav plates. (I have a full cav plate setup) The boat really likes to hop when im on it passing 70 on my way up.
 
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