Gallons Per Hour Estimates Needed ASAP
 

I am planning a trip in about 3 weeks and need to get my Gallons Per Hour Figures in order to plan my stops.

1990 Mach 1 Endeavor 29 '
Twin STOCK 454's
Mirage Stainless Props


I need Estimates at the following RPM's

2500

2900

3200

3500

The trip I am thinking of taking is around 450 Miles.. So it's important to figure this out.

Please Help.

fightclub



For those not familiar with the style of boat I attached a pic.

My guess is 1mi=1gal at 2500-3000 rpms. 1.25-1.5mi=1gal at 3500 rpms. Cruise at 45mph...eat 40-45 gallons per hour total. You may get better mileage, this is safe.

Thanks...

I can now plan my stops accordingly.

fightclub

Assuming 330's, you'd be around 33 gallons per hour per engine WFO.

where is the trip at?

START Lake Erie... Up into Lake St Clair - Pt Huron to Lake Huron.... Lake Huron to the Mackinaw Bridge. Bridge to Little Traverse Bay Lake Michigan.


ALL IN ONE DAY:D

Kidding over two days.

Rough estimate of approx 32 gallons per hour cruise...

If ypour cutting it close going from Mackinaw to Traverse City, you can stop at Northport at the tip of the Lenlenau penninsula. Great place to overnight if you want Mayberry on the water.

A bit different.. but I have to share...
I ran in a Top Gun today that had 675 Chiefs. The flow meters were saying 50 each at 4000rpm.

I think that resembles a garden hose...

330's should be around 26 gph each at WOT.
Maybe around 17gph each at 3600.

Reckless sounds closest so far.

Around 3000-3200 rpm seems to be the best for max MPG and hence miles per tankful. This seems to be where the hull and engine are at their best/most efficient. You'll have to check your boat to see what mph that equals.

in three weeks are you nuts???its cold and rough till july up there!! is this for fun or to move the boat? If you just need to move the boat rent a dually and pull it!!

most planning hulls are efficient in the low to mid 40mph range. Assuming that happens in your boat in the 3000 to 3500 range, with no positive tab and no throttling for rough water, you should burn 24 to 30 gal ( combined ) per hour.

There is a formula for horse power from gas that aviation uses. I don't recall it, but contact Jafo here on the board, and I'm sure he knows it. It should also work for all engines.

That trip is a little dangerous this time of the year. Water temps will still be in the 30's up north. Fog is a problem even on nice days with the cold water. I would take dry suits along just in case you end up in the water. It'll kill you in minutes otherwise. Are you sure you don't just want to tow it on a trailer? Pay for the diesel and I'll give you a hand.

my best guess is

1) fill tank before leaving
2) run till about empty
3) pull in some where and fill tank again
4) repeat steps 2 and 3 until trip is completed. :D :D

For most gas engines the rough rule of thumb is 7.5 gal. per hour for every 100 hp at 80 % of throttle cruise. That should add to the confusion :crazy:

My experience with moderately powered twins in V bottoms, when the trip is over you'll have used just about 1 gallon for every point to point mile you supposedly went, if you were paying REAL attention. Ever looked at the past track lines at the end of the day on the gps ? At least if you've been drinking you'd have an excuse. :D

Pleeeeeeeeeeeeeeeeeeeeeeease Who in the world do you think you are fooling?:rolleyes:

If youy've got EFI engines the controller outputs GPH burned. You can get the data from a SCAN tool. Probably not much help at this point but a way to get data in future.

Check RINDA Technologies web site--

http://216.230.203.183/home.html
http://216.230.203.183/marine/mtspec.htm

Poorsche

:D :D :D :D

I only know the full throttle formula .....1/2 a Lb. of fuel per HP per Hr.

Thanks for the offer. This run is just for fun, I have a trailer and truck. I will take a Dry Suit Two Marine Radios. A cell phone and a distress beacon.

I plan on taking my time and if get's rough I pull in and call for the trailer.

fightclub

Best advice yet:D


You forgot to add buy lot's of beer and food.

Holy Sh*t batman!!!!!!!!
 

Do the math with todays gas prices............:eek:

Merc used to use hp/12 = gals/hr. Need to know what hp you are developing at a particular rpm to use this. If you run it against your dyno numbers under load I think it looks fairly close.

My question is WHY?????

There was a time when I had more sense than cents ;) Hell i've had as many diesel boats as gas. In 1978 I had a 25' CC with a 636ci turbocharged Caterpillar.......wait a minute, that was sick to........maybe things haven't changed :crazy:

For the love of the sport!


Not really just sounded like fun and I told my buddy's over a few beers that I was going to do it. Now if I don't I will get a lot of SH*t.


It's not at speed run, just going to take a few days off and clear my head recharge the battery's. If it gets too cold or too rough I will pull out.

Work has been tough as you know over the last 18 Mo and I don't have enough time to take a real vacation.

I am sure most or all of the ice will be gone by the 3rd week in April.

fightclub