SOHC.co.uk Forums > CB350/400

400 Four - PETROL GRADE CURIOSITY ?

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allankelly1:
I think the main problem is if you leave the bike standing for a length of time

Extended storage leads to the fuel absorbing water as its hydroscopic that then leads to rotted tanks as the water separates from the fuel and then sits in the bottom of the tank

Same happens in the carbs bowls that can rot brass ware etc

Also like it says seals need to be viton but is new to here so most older bikes are not e10 suitable due to older type rubber in use

Also hear that if left even in newer bikes if they are not used often the fuel will damage injectors as you cannot drain these for long term storage unlike good old carbs

I think for newer vehicles obviously the seals are compatible and the main thing is if it’s in regular use the fuel does  not remain for long in the tank and other critical areas of the fuel system

Also not god for my RD35C either


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McCabe-Thiele (Ted):
I've used super unleaded as soon as 5 star petrol went. Aside from it usually being ethanol free it's also lower in sulphur I believe plus some additatives in the mix. Likewise I use the ultimate diesel brands. I have consistently had marginal improvements in mpg I'm only talking 1-2 mpg on big engine vehicles that return 22-27 mpg. I also add Wynns dry fuel into our Merc that we only drive in the summer same when I had the Yamaha XJ900 - it somehow keeps the water molecules in suspension. Not an issue on the Merc as it has a plastic tank but on the paper thin Yamaha tank that I had to replace after about 5 years due to pin holes everywhere it  ensured the new tank lasted many more years until I sold it.

K2-K6:
The grades currently available have obviously changed appraisal of them as E component is hot topic.

From a straightforward octane point of view,  none of these engines need or use a higher octane rating because of compression levels in their design.

To take advantage of raised octane fuel it would need to run increased compression and or need more advanced timing to gain advantage. Essentially it does nothing without modification as they don't approach the limits of fuel performance on the lower octane available 95 ?

"High performance" current injected engines that have compression and timing plus turbo etc optimised to run with raised octane fuels will scale back ultimate performance if used with a lower rated fuel. They can't analyse the fuel but they do have "knock" detection that senses the acoustic signature of cylinder detonation,  then pull back ignition advance and often increase fuel delivery to avoid catastrophic failure through heat accumulation in each cylinder.

Industry testing of true octane in fuel formation is ultimately verified by running a variable compression test cylinder engine.  It has the facility to keep increasing the compression on a run cycle until it starts to detonate, which confirms that specific formulation meets the stated rating to market the fuel at.

Seabeowner:
A bit like Julie, I have been using a bit of what I can get and noticed no difference. After E10 started I used super a couple of times, but will probably revert to every other fill. I'll probably drain the system for a few months over winter.

I knew the US had been using ethanol on and off for 50 years. Strange that only now they seem concerned about it and rant on about it.
I do wonder though if the corrosion found on the carbs (main jet tower particularly) that is seen on long stored US bikes may be a consequence.

K2-K6:
"I do wonder though if the corrosion found on the carbs (main jet tower particularly) that is seen on long stored US bikes may be a consequence."

Yes I'd see that the same as you,  the carbs being significantly zinc base matetial are easy meat in a sacrificed anode way. You just need the right chemical bath to propagate galvanic corrosion and away it will go.

There was a documentary recently that covered a service/spruce/maintenance refit of a north sea ferry in dry dock. They were changing the zinc sacrificial anodes on the hull (didn't even know they had them  ;D) great slabs of them that disappeared in protecting the hull and bronze propellers etc from the scavenging effects of running in sea water.

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