I run normal juice in the van and whilst it is ok I can feel it lacking.
Can you mix premium and standard to achieve a value of 94 RON (the old super) and what would be the quantities if standard is 91 RON and Premium 98 RON for a total of 50 litres?
Dave
( AND I STILL ADD THE VALVE STUFF)
If it is a proper 9.7:1 308 you really want 98. Earlier reds up to HQ and later blue and black are lower comp.
But mixing will increase. E10 ends up about 93-94 as Metho is about 110 or thereabouts and the 10% mix with 91 increases it by about 2 points.
Run 98 in everything! It's cleaner and doesn't have the 10% ethanol crap in it.
Christ! I run 98 in my lawnmower!
Vans.... This is the 2nd time round the block, 40 years later! talk about turning back the clock!
98 is no cleaner than standard unleaded (91 RON), that's the power of media advertising at work. It has a higher RON, that's all.Originally Posted by Big Rob
BURD is correct about zinc though, older engines with flat tappet cams, don't like the lack of zinc in the oil.
Dr Terry
I worked for years at a local service station and we often had fuel samples taken and were given a report of the breakdown of the fuel.
The standard unleaded always showed a lot of additives, impurities, aromatics (yep, aromatics!), colouring, etc.... sometimes as many as to fill the page and go to a 2nd page. Also, the octane rating varied considerably.
The 98 always showed 3 things; one colour, one aromatic and the rest was petrol. And the octane rating was always spot-on.
I'm not someone that listens to media bullsh*t, but I DO believe what I see with my own eyes.
Vans.... This is the 2nd time round the block, 40 years later! talk about turning back the clock!
A good mate of mine owned 3 servos until very recently and he said standard unleaded can have up to 9% Ethanol mixed in. He said the 98 is usually clean depending on the company. I use Caltex 98 in all my small engines too. When I was working in a bike shop we used to have troubles witha lot of bikes fouling plugs. The common factor was Shell Optimax. There was some extra additive in there that worked for cars but was hell on bikes. People weren't too happy when their 12 month old 1000cc sports bike wouldn't start for no apparent reason.
If you look at the msds for some ULP it will sjow up to 5% Benzene. Not a good thing, Benzene is nasty stuff.
and:
and:
All one and the same thing (well almost, aromatics are a combination known as BTX - Benzene, Toluene and Xylene isomers), are extracted during cracking (catalytic reforming these days...) and are all present in our fuels these days in varying amounts. Benzene has a very sweet smell, toluene is a little less "smelly" and if you've ever smelt an "Artline" brand permanent marker you've smelt xylene.
All hydrocarbons, all very nasty. Mostly there to keep (or in the case of Benzene due to its Hydrogen content - C6H6) to raise the octane rating of the fuel, hence one reason you'll find more of it in the higher RON fuels.
Funny the snippets of this sort of thing you pick up hanging around and working at servos, in my case a mate owned/operated a Shell then a Caltex servo later on that I used to spend a lot of time in and around many many years ago.
Last edited by Taily; 05-04-2014 at 06:23 PM.
Nunc est bibendum...
Lead was removed from petrol here in 87 or there abouts. It did lead to valve recession in heads in older cars. Lowered the octane as well causing pinging in higher compression engines.
There are lead additives you can buy to put in fuel. The best thing was to have hardened valve seats put in the heads and buy the higher octane fuel if you had a pinging issue.
If you don't have a higher compression ratio you won't gain anything from higher octane. But.... Don't use lower octane to premix two stroke fuel and not use it straight away.
Haven't heard of the zinc in oil thing?
Older engines need zinc in the oil, many oils today are missing it.
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