Offshoreonly.com

Offshoreonly.com (https://www.offshoreonly.com/forums/)
-   General Boating Discussion (https://www.offshoreonly.com/forums/general-boating-discussion-51/)
-   -   Guys still buying and using big power (https://www.offshoreonly.com/forums/general-boating-discussion/370922-guys-still-buying-using-big-power.html)

bblythe 03-24-2021 11:49 AM
Guys still buying and using big power
 
WHy hasn't the new crank driven procharger system caught on in the marine industry. You wound think it would fix alll the watercooling stuff the turbo guys have to deal with . they got software to run this stuff all over the place

caseyh 03-24-2021 12:07 PM
Originally Posted by bblythe (Post 4782928)
WHy hasn't the new crank driven procharger system caught on in the marine industry. You wound think it would fix alll the watercooling stuff the turbo guys have to deal with . they got software to run this stuff all over the place
they did make them for a while. been in a pro charged 32 fountain. was great till he needed support. procharger didn't come through said they didn't mess with it anymore.

hogie roll 03-24-2021 12:14 PM
Originally Posted by bblythe (Post 4782928)
WHy hasn't the new crank driven procharger system caught on in the marine industry. You wound think it would fix alll the watercooling stuff the turbo guys have to deal with . they got software to run this stuff all over the place
Torque curve doesn’t match the prop curve quite as well as a screw blower or roots supercharger. They can still be really fast. But you’ll be propping it for your available torque at plaining speed and end up with unusable power up top.

Keith Atlanta 03-24-2021 12:14 PM
Its a super cool platform as a power adder. But, who has that much room to run it? It adds almost 24 inches.

Keith Atlanta 03-24-2021 12:43 PM
Originally Posted by hogie roll (Post 4782930)
Torque curve doesn’t match the prop curve quite as well as a screw blower or roots supercharger. They can still be really fast. But you’ll be propping it for your available torque at plaining speed and end up with unusable power up top.
....after I said it wont fit in most boats due to available space. LOL

If you had the space to run it, couldnt that be tailored to the application with a gearing change?

hogie roll 03-24-2021 02:34 PM
Originally Posted by Keith Atlanta (Post 4782938)
....after I said it wont fit in most boats due to available space. LOL

If you had the space to run it, couldnt that be tailored to the application with a gearing change?
Not really, unless you have a transmission

bblythe 03-24-2021 04:12 PM
wont mercury and sterling be running into the same issue with there twin turbos . Understand the length most cats got plenty of room

Unlimited jd 03-24-2021 04:41 PM
Turbos have a much broader efficiency range.

Keith Atlanta 03-24-2021 06:18 PM
Originally Posted by hogie roll (Post 4782950)
Not really, unless you have a transmission

No, a gearing change in the procharger.

dsmawd350 03-24-2021 07:06 PM
you can run vent tubes to the props to cavitate them and get them to get rev up and get on plane instead of lugging down

hogie roll 03-24-2021 07:24 PM
Originally Posted by Unlimited jd (Post 4782972)
Turbos have a much broader efficiency range.
They also have a boost controller and crank the boost up at planing speeds.

hogie roll 03-24-2021 07:27 PM
Originally Posted by Keith Atlanta (Post 4782979)
No, a gearing change in the procharger.
The nature of a centrifugal supercharger is that boost increases 1:1 with engine speed. In a boat you end up with not enough torque at planing speed and then wacking your rev limiter up top with more torque than you need.

hogie roll 03-24-2021 07:27 PM
Originally Posted by dsmawd350 (Post 4782988)
you can run vent tubes to the props to cavitate them and get them to get rev up and get on plane instead of lugging down
You should for sure do this if you run a centrifugal blower.

Wasted Income 03-26-2021 04:13 PM
Originally Posted by hogie roll (Post 4782991)
They also have a boost controller and crank the boost up at planing speeds.
That's not necessarily true. The nature of turbochargers is that when put under load (such as coming onto plane) they will spool and make boost independent of RPM. If an engine would need to have the boost "cranked up" to plane, it's a totally mismatched engine/turbo/gearing/prop package.

Originally Posted by hogie roll (Post 4782992)
The nature of a centrifugal supercharger is that boost increases 1:1 with engine speed.
Boost with a centrifugal blower is engine speed dependent, but not a 1:1 correlation

https://musclecardiy.com/wp-content/...015/03/428.jpg

hogie roll 03-26-2021 07:46 PM
Originally Posted by Wasted Income (Post 4783204)
That's not necessarily true. The nature of turbochargers is that when put under load (such as coming onto plane) they will spool and make boost independent of RPM. If an engine would need to have the boost "cranked up" to plane, it's a totally mismatched engine/turbo/gearing/prop package.



Boost with a centrifugal blower is engine speed dependent, but not a 1:1 correlation

https://musclecardiy.com/wp-content/...015/03/428.jpg
Thanks

ICDEDPPL 03-26-2021 11:13 PM
Originally Posted by dsmawd350 (Post 4782988)
you can run vent tubes to the props to cavitate them and get them to get rev up and get on plane instead of lugging down
you don`t need those with a roots or screw, plenty of TQ on hand.


All times are GMT -5. The time now is 01:14 PM.


Copyright © 2026 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.