Boatmad.com


Reply
 
Thread Tools Display Modes
 
Old 20-11-2006, 10:30 PM   #1
Registered User
 
scottyboy's Avatar
 
Country: United kingdom
Location: West Sussex
Occupation: Grease Monkey
Interests: Makin my boat faster!
Boat name: S.B Racing
Boat make: Ocke mannerfelt canopied B23 / Zapcat
Engines: Merc 200XS Gen 2 / Tohatsu 50
Cruising area: littlehampton/Southampton

Join Date: Jan 2005
Location: West Sussex
Posts: 2,652
Fuel age limit

How long does it take for super unleaded to start losing its octane in a sealed container ? And how long before it is un usable in a sealed container i.e stale??
__________________

__________________
Class 3C Mono EPA National speed record holder 95.35 mph Avg!
scottyboy is offline   Reply With Quote
Old 20-11-2006, 11:07 PM   #2
Registered User
 
Burty's Avatar
 
Country: UK
Location: Weston Super Mare
Occupation: Electrical Engineer

Join Date: Mar 2004
Location: Weston Super Mare
Posts: 6,351
Send a message via AIM to Burty
i think Jay smith told me 2 months but i'm not so sure now
__________________

Burty is offline   Reply With Quote
Old 20-11-2006, 11:13 PM   #3
Registered User
 
Rupert Munro's Avatar
 
Country: England
Location: London
Interests: Extreme Sports, Cars, Boats

Join Date: Aug 2005
Location: London
Posts: 503
Send a message via MSN to Rupert Munro
Dont know about you but my fuel doesnt last long enough to find out!
Rupert Munro is offline   Reply With Quote
Old 20-11-2006, 11:45 PM   #4
Senior Member
 

Join Date: May 2006
Posts: 277
It depends on the seal!

Specific high octane race fuel used in motorsport last over a year, we have used it in a high compression turbo engine 18 months after purchace without issue.

In your boat tank you loose octane on the same day you add it.

In a plastic tin you would loose high octane after a week, low octane after 4 weeks.

In a steal tin jerry can about 3 times longer.

The higher the octane the faster it looses the edge. You need to decide how quickly the octane becomes an issue for your engine.

Also the fuel you get from the pump is 5% up or ( usually ) down in octane from what the description is.
FabFour is offline   Reply With Quote
Old 20-11-2006, 11:49 PM   #5
Registered User
 

Join Date: Mar 2004
Posts: 6,862
An Eskimo's snowmobile goes on the fritz. He takes it to a mechanic, who, after examining the vehicle, says, "I think you've blown a seal."

To which the Eskimo replies, "No, that's just a little ice on my mustache."
Matt is offline   Reply With Quote
Old 27-11-2006, 09:54 PM   #6
Registered User
 
Toffy's Avatar
 
Country: Belgium
Location: near Ghent
Occupation: engineer
Interests: boating, wakeboarding, snowboarding, fitness
Boat name: Outlaw
Boat make: Phantom 21ft
Engines: Yamaha 200hp
Cruising area: Zele / Kanaal Gent-Terneuzen

Join Date: Jun 2006
Location: near Ghent
Posts: 473
Quote:
Originally Posted by Matt View Post
An Eskimo's snowmobile goes on the fritz. He takes it to a mechanic, who, after examining the vehicle, says, "I think you've blown a seal."

To which the Eskimo replies, "No, that's just a little ice on my mustache."
Yup, it depends on the seal !
Toffy is offline   Reply With Quote
Old 30-11-2006, 12:54 AM   #7
Registered User
 
Burnett's Avatar
 
Country: England
Location: Hertfordshire
Occupation: Airline Operations.
Interests: Rum. Pirates. And West Cornwall pasties.
Boat name: Any suggestions?
Boat make: Ring 18
Engines: Mercury 200 Black Max
Cruising area: The Bay of 'E'

Join Date: Sep 2005
Location: Hertfordshire
Posts: 369
On a similar topic, what's the approved method for disposing of old stale fuel in the tanks after a long lay-up?
I'm thinking of replacing my Ring's steel bow tank with a nice shiny plastic one which will incorporate a sender for the gauge, but there will still be a few gallons of old 2 stroke swilling around in the old one.
Even if I keep the old one I still intend to drain the fuel system and replace the old line and bulb as a precaution before I start to use it regularly.
__________________
Boat: (Noun) - A hole in the water, lined with fibreglass, into which you pour money.
Burnett is offline   Reply With Quote
Old 30-11-2006, 01:55 PM   #8
Registered User
 
The Docta's Avatar
 
Country: UK
Location: Coventry (but from Lee on Solent)
Occupation: Sales Director
Interests: My Boat of course
Boat make: Extreme 21
Engines: Merc V8
Cruising area: Solent

Join Date: Jul 2005
Location: Coventry (but from Lee on Solent)
Posts: 578
Why on earth would you want to waste money replacing the tank??

There's nothing wrong with it and youd struggle to find a decent 100 litre plastic one that would fit well in the bow!

Plus the tank is stainless steel so if you want a shiney one - just polish the one thats in there?
__________________
The Docta
The Docta is offline   Reply With Quote
Old 30-11-2006, 03:03 PM   #9
Registered User
 
Burty's Avatar
 
Country: UK
Location: Weston Super Mare
Occupation: Electrical Engineer

Join Date: Mar 2004
Location: Weston Super Mare
Posts: 6,351
Send a message via AIM to Burty
if you have a petrol car just stick 3 litres of boat fuel in with a full tank and you wont notice a difference. thats a good way to use it up
Burty is offline   Reply With Quote
Old 30-11-2006, 04:01 PM   #10
Registered User
 

Join Date: Mar 2004
Posts: 6,862
I've used 2yr old fuel on "low performance" motors loadsa times. The ultima, right now, has 2+ year old fuel in - although I wouldn't nail it until it had some fresh fuel, it starts & runs fine.
You can smell when fuel has started to go sour. Water contamination, particularly on boats, is a bigger issue than fuel age. First time the formula ran this year was with 18 month old fuel.
Matt is offline   Reply With Quote
Old 30-11-2006, 04:34 PM   #11
Registered User
 
Burnett's Avatar
 
Country: England
Location: Hertfordshire
Occupation: Airline Operations.
Interests: Rum. Pirates. And West Cornwall pasties.
Boat name: Any suggestions?
Boat make: Ring 18
Engines: Mercury 200 Black Max
Cruising area: The Bay of 'E'

Join Date: Sep 2005
Location: Hertfordshire
Posts: 369
Quote:
Originally Posted by The Docta View Post
Why on earth would you want to waste money replacing the tank??

There's nothing wrong with it and youd struggle to find a decent 100 litre plastic one that would fit well in the bow!

Plus the tank is stainless steel so if you want a shiney one - just polish the one thats in there?
Easy Tiger!

I only said I was considering it! Just looking at general upgrades, that's all. I haven't had the chance to thoroughly check out all of that yet, and I was just curious as to what was involved. I'd certainly like to fit a fuel gauge sender unit in at some point so that I can fit the new gauge along with the new set of white faced Teleflex dials that are waiting to go into it in the warmer weather.
A definte upgrade will be a bigger battery though, or maybe two batteries in parallel. You can never have too much spare capacity!

One of Gav's Alien cowls is on the way some point, so while i'm playing with the powerhead I'll strip and clean the carbs and check the reed valves for damage. See if I can cure that stalling problem.

Actually, while you're here - What's the score with the sacks of ballast? I'd like to take them out if I can. The thought of them bursting at speed doesn't really appeal! Does it really need all that extra weight in the bows? If so, I'd like to find a neater solution, probably a tank with a pump that I can fill/empty with water. Any thoughts?

I'll post some pics on here when it's all finished so you can see what you think.

How's that 21 of yours coming along anyway?
__________________
Boat: (Noun) - A hole in the water, lined with fibreglass, into which you pour money.
Burnett is offline   Reply With Quote
Old 30-11-2006, 05:43 PM   #12
Registered User
 
The Docta's Avatar
 
Country: UK
Location: Coventry (but from Lee on Solent)
Occupation: Sales Director
Interests: My Boat of course
Boat make: Extreme 21
Engines: Merc V8
Cruising area: Solent

Join Date: Jul 2005
Location: Coventry (but from Lee on Solent)
Posts: 578
sorry bud - didn't mean to come accross as fierce

Sounds like your making some significant upgrades!

We were going to take the ballast out and just didnt get round to it. The 200 is not that heavy and I dont think that your boat needs it. It did keep the bow nice and low though which hlpd when it was calm and kept her very level but she tended to "stuff" in the rough - which was not nice and a little scary!

As long as you have a bow ful tank and keep plenty of juice in their though i think it will be fine.

Cheers
__________________
The Docta
The Docta is offline   Reply With Quote
Old 30-11-2006, 06:44 PM   #13
Registered User
 
Burnett's Avatar
 
Country: England
Location: Hertfordshire
Occupation: Airline Operations.
Interests: Rum. Pirates. And West Cornwall pasties.
Boat name: Any suggestions?
Boat make: Ring 18
Engines: Mercury 200 Black Max
Cruising area: The Bay of 'E'

Join Date: Sep 2005
Location: Hertfordshire
Posts: 369
No worries dude!

So, what might be a good move then would be to remove the ballast, then fit one decent sized gel battery either side of the tank. means I can free up some storage space behind the rear bench (I can fit a storage box for odds and sods, etc where the old battery was) Should help the weight distribution and give more reserve electrical power at the same time. Job's a good 'un!

Right. That's the end of my bit of thread hijacking! Back on topic again.

So, I should be okay to run out the bit of fuel that's in there as long as I dilute it with some fresh stuff. Thanks for that guys!
__________________

__________________
Boat: (Noun) - A hole in the water, lined with fibreglass, into which you pour money.
Burnett is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Powered by vBadvanced CMPS v3.2.3

All times are GMT +1. The time now is 06:25 PM.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2019, vBulletin Solutions, Inc.
×