fuel burn

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JES2309
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fuel burn

Post by JES2309 » Tue Aug 06, 2019 8:56 am

Hi Guys
New to this forum and getting back into boating after a long hiatus. Very serious about a 1979 F32, 318 Chryslers. Great boat well looked after but I am I have to admit I was a little horrified after seeing the limited range of these boats. We want to do medium length trips (200 miles) one way and are willing to run at around 1500 RPM as around here they're very strict with wake turbulence. Can anyone give me an accurate sense of GPH or range at this speed? It would be greatly appreciated.

Cheers

JES

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Re: fuel burn

Post by Moderator » Tue Aug 06, 2019 5:51 pm

I gave you your own thread
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prowlersfish
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Re: fuel burn

Post by prowlersfish » Tue Aug 06, 2019 6:10 pm

JES2309 wrote:
Tue Aug 06, 2019 8:56 am
Hi Guys
New to this forum and getting back into boating after a long hiatus. Very serious about a 1979 F32, 318 Chryslers. Great boat well looked after but I am I have to admit I was a little horrified after seeing the limited range of these boats. We want to do medium length trips (200 miles) one way and are willing to run at around 1500 RPM as around here they're very strict with wake turbulence. Can anyone give me an accurate sense of GPH or range at this speed? It would be greatly appreciated.

Cheers

JES
How much fuel do you hold ? (120 or 220 gals) Do you just have 2 tanks or do you have the 4 tank option ? You should be able to get a few miles to the gal IF you run at apox 7 knots or less . Once you get much passed that you start plowing water and mileage goes to hell . Then gets better once on plane . On plane I would think you would be in the 1 mpg range
TROJAN F36 Conv.
6BTA Cummins diesels
Life is to short for a ugly boat :D
2009 TROJAN RENDEZVOUS
Port Kinsale 2010 & 2011. Solomons get together 2011.

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captainmaniac
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Re: fuel burn

Post by captainmaniac » Tue Aug 06, 2019 9:32 pm

I have 360s and not the 318's. At 1500rpm I get about 8 knots, and get about 1.5mpg. "Your mileage may vary".

JES2309
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Re: fuel burn

Post by JES2309 » Tue Aug 06, 2019 11:01 pm

Thanks guys. While we’re at it are there any F32 specific issues or red flags I should look for when looking at the 2 Boats I’ve narrowed my search to?

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prowlersfish
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Re: fuel burn

Post by prowlersfish » Wed Aug 07, 2019 6:36 am

Get a survey , check the stringers . Goes for all boats that age
TROJAN F36 Conv.
6BTA Cummins diesels
Life is to short for a ugly boat :D
2009 TROJAN RENDEZVOUS
Port Kinsale 2010 & 2011. Solomons get together 2011.

CaptainSteve
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Re: fuel burn

Post by CaptainSteve » Wed Aug 07, 2019 1:26 pm

I just did a test last weekend on my F32 with tired 318s.

Image

I use the Garmin GFS10 fuel flow meters into the NMEA network for data.

Hull speed is the key. Square root of waterline length x 1.34 for the hull speed.
Sqrt of 30 = 5.47 x 1.34 = 7.33
Max efficiency at 7.33 water speed.
1977 Trojan F32
Hotel California

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