Fuel/oil ratio

Dan · 18-04-2007, 10:14 AM

Just had the 260efi fitted and am hearing very conflicting comments in terms of the fuel oil ratio. I cant remember the name of the fully synthtic stuff that I got but it states that you can run at 100:1, and the forum member that I got it from has run a 2.5 260efi at 75:1 with no problems at all, but...........I'm also being told that I shouldnt run at any more that 32:1, bit confused really as I trust both parties!!
Any thoughts??

On another note first time out in it last nite and the performance was awsome!
Cheers
Dan

roofer · 18-04-2007, 10:49 AM

Good quality fully synthetic at 32/1 unless you want it to go bang!

verytricky · 18-04-2007, 10:56 AM

There are speciality oils you can run at 75:1 or even higher, but they are special.

Dan · 18-04-2007, 12:24 PM

Quote:

Originally Posted by verytricky

There are speciality oils you can run at 75:1 or even higher, but they are special.

Yeh, I cant remember the name of it but it states on it that you can use it up to 100:1

Bazza · 18-04-2007, 01:16 PM

Dan, we use Valvoline fully synthetic in our 2.5efi @ 32-1 DO NOT GO WEAKER THAN THIS, IT WILL GRENADE.

roofer · 18-04-2007, 03:05 PM

Quote:

Originally Posted by Bazza

Dan, we use Valvoline fully synthetic in our 2.5efi @ 32-1 DO NOT GO WEAKER THAN THIS, IT WILL GRENADE.

That is the same oil I use.

Toffy · 18-04-2007, 07:51 PM

the more rpm's, the more oil you'll need in your mix...
1:32 sounds perfect for the 2.5 efi. I wouldn't risk wasting an high performance engine running it on a 1:100 mix...

1:100 must be superlubricant

Don't know how you could benefit from this ?? More performance ? Bit cheaper ? I doubt it...

sinkunit0 · 18-04-2007, 08:40 PM

on similar topic whats the best way to ensure a good oil/fuel mix when filling a belly tank thats 4 inckes high and 1 1/2 meters long

CB1 · 18-04-2007, 08:58 PM

Use a big funnel and pour in the oil whilst pouring the fuel. Dont put the oil in before the fuel as it dosn't mix too well.

JamesM · 18-04-2007, 09:22 PM

I think thats only generally a problem with mercury performance blend. I allways put the oil in first then the fuel then drive to the slip. I'd have though all the starting stopping going round corners and round abouts would mix it up pretty good. That said though I don't use performance blend!!!

scottyboy · 18-04-2007, 09:43 PM

Mix it in cans if you wanna be double sure! Thats all i do! That way if you mix all the cans at once if you only need ten litres to top up, the fuels already mixed and all you need to do is pour in ten litres instead of working out what the ratio of oil is for that amount!

Burty · 18-04-2007, 10:16 PM

Quote:

Originally Posted by Dan

Yeh, I cant remember the name of it but it states on it that you can use it up to 100:1

Not really much help unless you tell us the make now is it?

OCRDA · 18-04-2007, 10:53 PM

Its 100:1 AMSOIL I ran an XR2 from new for 2 seasons @75:1 & when checked it was like new I have it on good authority that in the states they are running 2.5's @ 100:1 !! Now being realistic we are talking merc Hi Perf & its as sure as death & taxes going to Shit itself however much oil you put in the only advantage is better performance,cleaner running, better fuel consumption (petrol is cheaper than oil) even a Seagul 40 plus would run on it.

Bob

Cookee · 19-04-2007, 09:10 AM

Castrol Biolube was claimed to run at 100:1 - never did trust it at that ratio for an XR2 though!

verytricky · 19-04-2007, 12:25 PM

Alsyn oils also claim a 100:1 ratio due to their better than the best lubrication etc.

Oil does not burn as good as petrol, so you get a better performance due to that. Oil actually stops the combustion of petrol in the engine, so removing oil has a doubling effect. ie going from 25:1 to 50:1 will not only give you the benefit of half the oil, the benefit is that the remaining petrol burns even better.

Having said that, I never reduced the oil in my engines - out of fear...

Rob21 · 19-04-2007, 08:37 PM

dan theres a post on s&f about amsoils you should read it before
you use it!!! it does not seem to impress jay smith

Rob.

OCRDA · 19-04-2007, 10:38 PM

Better still check with Terry Rinker !!

OCRDA · 19-04-2007, 11:44 PM

http://www.amsoil.com/rinker/video/index.aspx

roofer · 20-04-2007, 07:56 AM

Quote:

Originally Posted by OCRDA

http://www.amsoil.com/rinker/video/index.aspx

http://forums.screamandfly.com/forum...d.php?t=129565

Jay Smith · 21-04-2007, 08:45 PM

I choose NOT to get into an oil debate with anyone and could and can care less what oil anybody chooses to run , all I can report and render an observation about is based on my opinion and my own findings, I am not an oil salesman nor do I make a dime selling oil I want to estabilish that from the start..

It was discussed on S&F and someone ( not me ) reported ( but took the post down ) the F1 racer in question's wrench changes bearings and rings after every race and has the motor recoated after 80 hours after running the "majic elixer" I don't know nor care what they or anybody else uses or does , but can the average boater afford or choose to do that being loyal to an OIL to make an engine live????? IMO these snake oils are not a quality oil , ever notice that for every 1 person that likes it ( and they are either trying to sell it or getting paid by the company to endorse it ) there are 20 with a horror story about it! I shouldn't throw up the warnings I tell people in the states that I drive new corvettes every year and alot of the payments are made by these snake oil users with smoked engines..A racing engine that is torn down EVERY race is a very bad example to endorce and prove the durability and quality of a particular oil sold for a consumer engine that runs all or several seasons and is not torn down on a VERY regular basis... ( EVERY WEEKEND )

Disclaimer: All the above is simply my OPINION I am no oil guru but I don't like what I see when rebuilding these motors thats used this product...

Good luck,
Jay @ JSRE