Cummins Marine Diesel Repower Specialists › Forum community › Marine Transmissions › ZF220A hp capacity?
Tony Athens.Can you tell me the maximum HP the ZF220A can handle when paired with the Cummins QSB5.9? recreational usage.
Using a ZF220A on new QSB 6.7 425 (max rated at 417BHP 3070RPM) is a no brainer for me. Prop the engine at 400HP/3100-3150 RPM ( 85-90% load at 3000 RPM) and you’ll never look back.
Seaboard Founder & President
Thanks Tony, I’m in Southern New Jersey and will be seeking repower soon as I have 8.2TI Detroits (300 Hp) and lost one last November. I used the boat as a summer condo this year with fuel at $6/gal, but don’t think I can do that much longer. Need to be moving!! I have a really nice engine room, but it is short in length and going from a V8 to inline 6 reduces my options. I only have 5″ in front of the engines and the 5.9 with a ZF220A is only 2″ longer from flange to front than my 8.2’s. To go to a ZF85, is a little longer and I don’t have the space. I’m certain the Cummin 5.9QSBs will fit with the ZF220A gear, just wondering the max HP I can go. You know all the options with them and was wondering if the 425 versions were OK. Thanks for your input, I’ll keep it under 400 as I look. I’m not looking for super speed, but may as well have all the HP available if needed. The boat is a Navigator 42 Classic. Expect to hear from me in the future as I have joined your site, read countless advice pieces already and will be purchasing SMX items as I go through the repower.
Per the book——–400HP max regardless of the RPM…………..Past long term experience tells me 475 BHP 3400-3475 is not an issue if all is right as to the installation.. Solid gear.,
Seaboard Founder & President
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