Aspiring vehicles

[virus]

[Robby]

I'm not thinking about performance, it would be impressive if it would run at all.

[virus]

true. I thought Ethanol needed higher comp ratios to burn though? and what with the 250RS habit of cracking heads Id be surprised if you could get away with it.

Cheers
John
____________________
own: 81 xs1100g...
owned: 85 rat CG (sold), 91 GS500e (stolen), 84 gsx400f (scrapped), 81 z250 (siezed, siezed, scrapped), 83 cb250rs (sold), 84 gpz750r ratfighter (killed) 84gpz400 (sold), '80 cb650 ratfighter (wrote off) 95gsx6/12f ratfighter (killed) 91 xj900 (sold)
stinkwheel Well I just had my hands up a pigs fanny. Which makes your concerns pale into insignificance.

[Robby]

It will still burn and do it's thing just fine at stock compression, it's just a much higher octane number so capable of taking much more compression.

It also contains less energy for a given amount than petrol, so it needs bigger jets. I could also run more ignition advance.

All of this is purely theoretical currently. At some point in the future I might get around to it, probably when my main bike is electric and I want to avoid using fossil fuel for anything.

The trickiest bit would be tracking down everything in the fuel system made of rubber and changing it to metal or viton, and finding or making suitably sized jets.

[Tarmacsurfer]

On a tangent, while they may be prone to failures I was impressed by how forgiving the top end was on the CB250RS. Going back to the early nineties I bought a "project" 250RS sight unseen, friend of a friend job.

Went to collect, dragged it out from the back of the lockup and tinkered for a while. Had spark, had compression. Added petrol and it ran...

Rode home (on private roads, honest ossifer) slowly as it was only a couple of miles and marvelled at the sounds coming from the top of the engine at any revs at all. If I had paid more than £20 for the thing I'd have stopped and pushed but I was feeling lazy and decidedly lacking in mechanical sympathy.

Got home to discover the exhaust valves were pretty much rocking in the guides, I was utterly astounded it had started let alone gotten me back. Having said all that, I had also had an XL250 for a while which had been a teenagers field bike. The thing ran quite well but didn't have a single gasket in the engine - it was all blue Hylomar sealant.
____________________
I'm immortal. Well, so far.

[st3v3]