Cummins Marine Diesel Repower Specialists › Forums › Boats & Repowers › CAT 3126 420 to Cummins 6CTA 430 › Reply To: CAT 3126 420 to Cummins 6CTA 430
October 25, 2017 at 5:49 pm
#24285
Tony Athens
Moderator
Vessel Name: Local BanksEngines: QSB 6.7 550 HP
Location: Oxnard, CA
Country: USA
I am not sure exactly what you are asking but if you put in a 430 C and use the same gear & prop, the 430 will run very easy and probably will make over 2700 RPM with “no sweat”..
The vessel speed will be exactly the same RPM to RPM , as remember, “the prop moves the boat, the engine just turns it” (in so many words)..
If the guy wants more performance, do a 1st class repower, do not change the prop, put 50 hours on the vessel, and then we’ll look at the numbers and compare to the Cummins specs , look at all, and go from there.
Tony