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Carver 390 CPMY - 'Sweet Spots' for fuel economy?

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boatingbob
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Carver 390 CPMY - 'Sweet Spots' for fuel economy?

Postby boatingbob » February 17th, 2016, 12:25 pm

Hi! This is a question for Carver 390 owners who may have put Flowscans on their boats, and are powered by with Crusader 454XLs. What are the best rpms you've found for fuel economy on/off the plane?

I've been running mostly just below hull speed, and unless I've been consistently goofing up my calculations when I fill up, my economy has been really good (about 4gph combined when running at 7 - 8kts).

At a little less than 2mpg, I'm pretty happy with that. On a run, I'll put it up on the plane and get about 14kts at 3000rpm for 5min or so to clean out the carbs, but I like the economy at 'trawler speed'.

But...if any of you have some reliable flowscan data at planing speeds, I'd love it if you share them.

On another geeky note, what do you think the minimum planing speed of a Carver 390 CPMY is? I have a 1994 model, and I'm trying to figure out the minimum planing speed before it starts to 'mush' and just push gobs of water (which obviously isn't good for fuel economy). At 39' LWL, I guessing Hull Speed is just under 8kts.

Thanks!

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Re: Carver 390 CPMY - 'Sweet Spots' for fuel economy?

Postby Lyndon670 » February 17th, 2016, 5:50 pm

Here is a virtual flow scan you can use to guestimate what you are looking for. When I had my 41C Silverton with the 8.1's, I could stay on plane at 3000rpms at 15kts - which was the perfect sweet spot for fuel range/speed.

http://www.boat-fuel-economy.com/crusad ... us-gallons
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tonyiiiafl
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Re: Carver 390 CPMY - 'Sweet Spots' for fuel economy?

Postby tonyiiiafl » February 18th, 2016, 3:59 am

Just bought a 39 CMY myself, except it has 7.4 Mercruisers Carbed. I am interested in seeing how bad she is going to bleed me at just planning speed. Should know in May!
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feeez
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Re: Carver 390 CPMY - 'Sweet Spots' for fuel economy?

Postby feeez » February 18th, 2016, 7:21 pm

That was a pretty cool link for estimated fuel burn Lyndon. The results are very close to what I calculated for my boat last season

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Re: Carver 390 CPMY - 'Sweet Spots' for fuel economy?

Postby Lyndon670 » February 22nd, 2016, 10:13 pm

Ya, I always used that as a benchmark for my 41C to make sure my engines were running top notch Fraser.
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Re: Carver 390 CPMY - 'Sweet Spots' for fuel economy?

Postby feeez » February 23rd, 2016, 9:57 pm

I see have found a home for 2016.... Rawley. I wasn't aware they had permanent slips there.
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Re: Carver 390 CPMY - 'Sweet Spots' for fuel economy?

Postby Lyndon670 » March 5th, 2016, 12:28 am

It's something new they are trying. We will give it a try for the season and see where we are at come October. We are considering Queens Cove as well.
Lyndon,
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