Jump to content

E5 fuel

Recommended Posts

21 minutes ago, openspaceman said:

Yes the higher the octane (resistance to knocking) the lower the calorific value, to the extent that engines that ran very high compression ratios and had to use methanol to prevent knocking would have 70% bigger jets and much increased fuel consumption.


The corollary is that diesel, which won't ignite with a spark and detonates if put in a spark ignition engine has 10% more calories than 95ron petrol

Yep, you just beat me to it.

I remember as a school boy running a Bantam on methanol....It went like shit off the proverbial hot shovel.


Running a low comp engine on high octane fuel may only be a waste whereas running a high comp engine on low octane fuel can definitely cause damage.

Edited by Macpherson
spelt bad
  • Like 2

Share this post

Link to post
Share on other sites
32 minutes ago, Macpherson said:

running a Bantam on methanol.

Filed head and CastrolR?


I never tried methanol myself in anything other than my model aero engine.


Ran the LR110 V8 on propane though and wish I'd upped the CR on that. The engine was so reliable for 10 years that I never had reason to modify it.

Share this post

Link to post
Share on other sites
14 minutes ago, openspaceman said:

Filed head and CastrolR?

Yep, Love the smell.....it didn't last long !


I'm thinking that the problem with alcohol in petrol is the petrol..... maybe I should mix some Stihl green with some pure spirit😄

Share this post

Link to post
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.

Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

  • Featured Adverts


Arbtalk.co.uk is a hub for the arboriculture industry in the UK.  
If you're just starting out and you need business, equipment, tech or training support you're in the right place.  If you've done it, made it, got a van load of oily t-shirts and have decided to give something back by sharing your knowledge or wisdom,  then you're welcome too.
If you would like to contribute to making this industry more effective and safe then welcome.
Just like a living tree, it'll always be a work in progress.
Please have a look around, sign up, share and contribute the best you have.

See you inside.

The Arbtalk Team

Follow us

  • Create New...

Important Information

We have placed cookies on your device to help make this website better. You can adjust your cookie settings, otherwise we'll assume you're okay to continue.