Experience of isopropyl - good read (long)

[Richard L]

http://enginehistory.org/Frank%20WalkerWeb1.pdf

[Richard L]

bump for good info

[OLD-N-GREY]

WOW, ... This demands re-reading to get it past the thick part of my ordinary brain.!!!!!

[jmlegacy]

OK,

So basically it's too rich if used the injection configuration of methanol/ethanol?
What if he had adjusted the AFR to match an ideal Lambda?

I imagine that methanol has more oxygen content than iso alky.
I imagine that you will need a smaller nozzle for iso alky?

Isopropyl also contains a higher energy content than methanol
There is conflicting info on the internet about the octane of isopropyl.

and what is the stoich of Isopropanol?

[Richard L]

Methanol: ......... 6.43
Ethanoi:............ 8.94
Isopropanol: ..... 10.28
Butanol: ........... 11.12
Pantanol: ......... 11.68
Gasoline: .......... 14.70

[jmlegacy]

Hey richard, I had asked some chemist on Quora.com what the stoic is, the responded 11.4:1

His response:

The combustion of isopropanol is:
C3H8O +9/2 O2 = 6CO2 +8 H2O
Mol weights are 60 for IP
32 for O2
So for each mole of IP burned,60g you need 9/2 of O2 that is 9*32/2=144g
ratio is 60/144 or 1:2.4
air is not 100% O2 is is only 21% so need
2.4/.21= 11.4

No wonder they were shooting flames.

[Richard L]

I got the data from here:

http://www.aquamist.co.uk/forum/alcohol fuel.pdf

[parmas]

Why would any use Isopropanol instead of ethanol or even methanol which are surely a better alcohol ?

[Dust]

Found this on another forum

http://subypal.blogspot.co.uk/2011/1...injection.html

[parmas]

Originally Posted by Dust

Found this on another forum

http://subypal.blogspot.co.uk/2011/1...injection.html

Great find Dust ! A must read !

According to this article isopropyl is all way better than methanol.. what about the corrossion ? Is isoprpyl a winner here again ?