fuel burn

This forum is for comments and the exchange of information relating to Trojan Boats and boating. Please do not post used parts or boats For Sale in this area. For general, non-boating topics please use our "General Discussions" section.

Note: Negative or inflammatory postings will not be tolerated.

Moderators: BeaconMarineBob, Moderator, BeaconMarineDon

Post Reply
JES2309
Registered user
Posts: 4
Joined: Tue Aug 06, 2019 8:45 am

fuel burn

Post by JES2309 »

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
User avatar
Moderator
2024 Gold Support
2024 Gold Support
Posts: 301
Joined: Sun Feb 21, 2010 11:48 am
Location: Could be anywhere
Contact:

Re: fuel burn

Post by Moderator »

I gave you your own thread
Moderator

Helping keep Trojan Yachts alive .
Forum Moderator
TrojanBoats.Net
Trojan Boater
User avatar
prowlersfish
2024 Gold Support
2024 Gold Support
Posts: 12645
Joined: Sat Nov 05, 2005 6:56 pm
Location: Lower Chesapeake Bay ,Va

Re: fuel burn

Post by prowlersfish »

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
Boating is good for the soul
77/78 TROJAN F36 Conv.
6BTA Cummins diesels
Life is to short for a ugly boat :D
User avatar
captainmaniac
2024 Gold Support
2024 Gold Support
Posts: 1917
Joined: Sat Apr 30, 2005 10:26 pm
Location: Burlington, Ontario

Re: fuel burn

Post by captainmaniac »

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
Registered user
Posts: 4
Joined: Tue Aug 06, 2019 8:45 am

Re: fuel burn

Post by JES2309 »

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?
User avatar
prowlersfish
2024 Gold Support
2024 Gold Support
Posts: 12645
Joined: Sat Nov 05, 2005 6:56 pm
Location: Lower Chesapeake Bay ,Va

Re: fuel burn

Post by prowlersfish »

Get a survey , check the stringers . Goes for all boats that age
Boating is good for the soul
77/78 TROJAN F36 Conv.
6BTA Cummins diesels
Life is to short for a ugly boat :D
CaptainSteve
Registered user
Posts: 5
Joined: Sat Jul 27, 2019 12:27 am
Location: Southern California

Re: fuel burn

Post by CaptainSteve »

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
Post Reply