C32 Engine life and rebuild cost

An E rated 10,000hrs or 200,000 gallons of fuel.....whichever comes first.....some may go longer, some may go shorter.....

According to the operation manual for a c-32 acert E rated engine a major overhaul is due at 5000 hrs or 140,000 gallons of fuel.

What y'all think i can get out of my 12 v 92's that i really baby? never run them over 1800 rpm

What type of boat and what is cruise speed at 1800 rpms? Who marinized them? They seem to do best in a boat that is "overpowered" or let's say cruises at least 25+ knots. From what I've experienced boats they're installed in that have drastically changing load factors in a sea, is very hard on them. For example on that striker it would cruise at 21 knots, but slow down to 17 knots climbing up the wave, then up to 23 knots on the way down. They seem to favor a boat where the cruise speed stays the same in a sea.

That is true for the ACERT versions. The OP asked about NON-ACERT 1600hp E=rated C32's which was the figure I quoted earlier.

capt j
1990 54 bertram cruise at 1800 is 21-22 knots.

1950 cruises at 25 knots. wot 2350 28 knots.

I'd run them faster than 1800. With Detroits I'd go with where they sound like they're not working so hard and feel the best anywhere from 1800-2000rpms..... Generally around 1900-1950 rpms. The best would be to have EGT gauges at the helm and run them around 750F and stay under 800F.

"Maybe it is a South Florida thing, but I have seen the life of the DD 12V 71's and 92's easily exceed your 1000 hour experience out west. I have seen 3000 - 6000 hours, not every once in awhile but in the majority of the cases I have been onboard out here."

I am with pacblue, everyone i have spoken with around here usually get 3000+ hours on their 92s. One of my neighbors with an 8v92 cranking 735hp go just over 4000 hours before needing an overhaul. I think 3000-3500 is the norm.

Maybe it has something to do with the cooler waters compared to FL? I am in southern california.

I have never seen 12v92's go very long, rarely. 8v92's are a different story and seem to do better. Those I see 2000-2500 hrs out of a SF.

.[/QUOTE]

I also think we don't push our boats as hard.

With short distance destination locations out East, there may be an inclination to throttle up an go. Out here, if the fish are biting 100 miles+ offshore, most of the boats will leave port by 10:00pm the night before running at 10 - 12 knots to get near the right spot by daybreak.

I had the opportunity to speak with a DD factory engineer who put in 40 years at the plant. He informed me that the Series 92 engines were indeed developed for On-Highway (Transportation) and Off-Highway (Heavy Equipment and Power Generation) markets. General Motors was the owner at the time and that was their focus, not the Military market. Increased power and improved fuel consumption over the 71 Series were driving forces. They even tried an inline 6 - 92 but it failed during testing.

Military engines typically have to pass a NATO 400 hour endurance test to be accepted for that market. Those engine configurations are never seen for public use.

Engine rebuild

I checked the site and was unable to find an answer to the following question.
350q Chris Craft engine complete rebuild. Running tem is 10 degrees higher then normal. Rebuilder says normal till broken in. In past with heavy trucks etc have had similar experience. How long( hrs) can one expect till temp comes down to normal?