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Forced Induction EFI or NA with a Carb
Ok how much additional expense and headache is it worth to go forced induction?
I currently have an HP 500 Carb motor and am wanting to bump it up to around 650ish. Anymore than that and I’m assuming I’ll start running into start running into exhaust and drive issues(have an standard bravo with XR gears and a sportmaster -2 lower). I don’t drag race around or anything just looking for a little more pep in the few evening hot laps I make. I’d like to keep everything under the hatch witch eliminates a roots blower and leaves me converting to EFI and going with either a whipple or procharger. I’m assuming by the time I get the kit and whatever I’ll need to convert over to EFI this will be a decently sized bill. As I’m only wanting to go to 650 I’m reasonably sure I could get some nice aluminum heads, a bigger cam, maybe a bigger crank and go to a 540( I don’t think I would really need this either), and a bigger carb and that would get to the same HP for a much cheaper price I know blowers pack a much better punch with better torque curves but in my case I’m thinking the price difference won’t be worth it. I’ve never owned/driven a blown boat before so I don’t know. What are the groups thoughts ? |
How heavy is your boat? Single engine? Use of the boat? In my research the centrifigal chargers make so much power up top needing a huge prop that can be tough to jump out of the hole with. For my purposes of family fun and wakeboarding it just wasn’t the right fit for me. |
650hp is going to be tough out of a 502 NA. It would have to be pretty high compression, the perfect camshaft and some really nice exhaust. I would recommend going to 540 CI or bigger if you want to keep it NA, but I am a blower guy. I say Whipple it and be done with it.
https://whipplesuperchargers.com/ind...&product_id=55 |
Originally Posted by farmo83
(Post 4632033)
Ok how much additional expense and headache is it worth to go forced induction?
I currently have an HP 500 Carb motor and am wanting to bump it up to around 650ish. Anymore than that and I’m assuming I’ll start running into start running into exhaust and drive issues(have an standard bravo with XR gears and a sportmaster -2 lower). I don’t drag race around or anything just looking for a little more pep in the few evening hot laps I make. I’d like to keep everything under the hatch witch eliminates a roots blower and leaves me converting to EFI and going with either a whipple or procharger. I’m assuming by the time I get the kit and whatever I’ll need to convert over to EFI this will be a decently sized bill. As I’m only wanting to go to 650 I’m reasonably sure I could get some nice aluminum heads, a bigger cam, maybe a bigger crank and go to a 540( I don’t think I would really need this either), and a bigger carb and that would get to the same HP for a much cheaper price I know blowers pack a much better punch with better torque curves but in my case I’m thinking the price difference won’t be worth it. I’ve never owned/driven a blown boat before so I don’t know. What are the groups thoughts ?
Originally Posted by Baja Rooster
(Post 4632037)
How heavy is your boat? Single engine? Use of the boat? In my research the centrifigal chargers make so much power up top needing a huge prop that can be tough to jump out of the hole with. For my purposes of family fun and wakeboarding it just wasn’t the right fit for me. while this is pretty generic, its close. https://www.cjponyparts.com/skin/fro...urve-graph.jpg if your going to run your motor at WOT all the time then CF. CF also takes less power to spin. if your gonna be all down low then Twin Screw or Roots. Twin Screw > Roots because you get lower discharge temps, a CF will get you lower discharge temps then both of those but don't produce the volume at low speed |
I built a Procharged engine for my boat..
It's 555 cid with an M4 Procharger Used a fairly small cam. 8.5:1 compression. AFR heads, Eddie Marine manifolds, and Holley EFI Dyno'd in full marine dress.. made 629 hp N/A 1020 hp blown. Have the blower set up for 10 Lbs of boost at 6000 RPM... It's in a 29' Velocity. Running a 1.35:1 ratio XR with a 26 pitch P5x prop Boat jumps out of the hole and accelerates HARD at any rpm It's a absolute BLAST to drive ! I NEED a shorter drive at this point (next year) but have hit 99.7 MPH.. I am NOW addicted to BOOST.. :D https://cimg7.ibsrv.net/gimg/www.off...a130a3b5bf.jpg https://cimg1.ibsrv.net/gimg/www.off...6fbff175f4.jpg https://cimg6.ibsrv.net/gimg/www.off...adf772c531.jpg |
Originally Posted by farmo83
(Post 4632033)
Ok how much additional expense and headache is it worth to go forced induction?
I currently have an HP 500 Carb motor and am wanting to bump it up to around 650ish. Anymore than that and I’m assuming I’ll start running into start running into exhaust and drive issues(have an standard bravo with XR gears and a sportmaster -2 lower). I don’t drag race around or anything just looking for a little more pep in the few evening hot laps I make. I’d like to keep everything under the hatch witch eliminates a roots blower and leaves me converting to EFI and going with either a whipple or procharger. I’m assuming by the time I get the kit and whatever I’ll need to convert over to EFI this will be a decently sized bill. As I’m only wanting to go to 650 I’m reasonably sure I could get some nice aluminum heads, a bigger cam, maybe a bigger crank and go to a 540( I don’t think I would really need this either), and a bigger carb and that would get to the same HP for a much cheaper price I know blowers pack a much better punch with better torque curves but in my case I’m thinking the price difference won’t be worth it. I’ve never owned/driven a blown boat before so I don’t know. What are the groups thoughts ? |
for what you are looking for a M1 procharger, blow thru carb will do the trick BUT need to tune with wide band to get it right...ran a setup like that for 5 years
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Originally Posted by farmo83
(Post 4632033)
Ok how much additional expense and headache is it worth to go forced induction?
I currently have an HP 500 Carb motor and am wanting to bump it up to around 650ish. Anymore than that and I’m assuming I’ll start running into start running into exhaust and drive issues(have an standard bravo with XR gears and a sportmaster -2 lower). I don’t drag race around or anything just looking for a little more pep in the few evening hot laps I make. I’d like to keep everything under the hatch witch eliminates a roots blower and leaves me converting to EFI and going with either a whipple or procharger. I’m assuming by the time I get the kit and whatever I’ll need to convert over to EFI this will be a decently sized bill. As I’m only wanting to go to 650 I’m reasonably sure I could get some nice aluminum heads, a bigger cam, maybe a bigger crank and go to a 540( I don’t think I would really need this either), and a bigger carb and that would get to the same HP for a much cheaper price I know blowers pack a much better punch with better torque curves but in my case I’m thinking the price difference won’t be worth it. I’ve never owned/driven a blown boat before so I don’t know. What are the groups thoughts ? |
Idles all day, no loading up.
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