Alternative fuels > Waste Vegetable Oil

Cold starting on crappy wvo

(1/15) > >>

kyradawg:
.

Peace&Love :D, Darren

hotater:
I've been thinking about increasing compression to see if it makes up for altitude.  Yesterday I reset my piston clearance to .054"  That keeps the intake valve off the piston under no load and starts much better than with the .069 I'd had in it. (Don't remember doing that...I think I missed scraping a gasket off last time.)

The intake valve 'touches' the piston at .052 on mine.  If I assume that's 19:1 compression it'll take some creativity in the pre-combustion chamber to go any higher.

Why not a three way valve so you can stop and re-start on dino fuel...or a CS glow plug from George....

sb118:
I thought the main problem of starting on cold veg oil is that it is very thick, it doesn't spray properly from the injector, it's more like pouring honey into the engine than fuel. It doesn't produce a fine mist which is needed for ignition.

GuyFawkes:

--- Quote from: sb118 on February 19, 2006, 09:37:21 PM ---I thought the main problem of starting on cold veg oil is that it is very thick, it doesn't spray properly from the injector, it's more like pouring honey into the engine than fuel. It doesn't produce a fine mist which is needed for ignition.

--- End quote ---

yup, it doesn't atomise cold, so somehow you need to heat everything up, or, fit a dual injection system.

TBH the only way I see to do a practical temperate climate veggie oil only lister is to accept a ten minute preheat before starting as normal, so that's resistance wire around the fuel lines and injection system and block heaters in the head or heat up the coolant....

on bigger scales it's been done with a small donkey engine used to warm up a big engine by heating and circulating the coolant and lube oil

in many ways the whole point of the lister is it is a rugged and economical slow speed engine, so you don't start and stop it all the time, let the bugger run, just give it 30 minutes of diesel before shutdown and 10 minutes of diesel for start up

kyradawg:
SB118 and Guy,

Are you sure that it is the fuel being atomized that gets the mixture explosive?

Im of the school of thought that the rise in compression ratio and heat due to the displacement of compression space from the injected fuel is what gets the party started.

 The reason I say this is because my ford f-250 diesel has no trouble starting on viscous fuel I just glow the plugs as normal and she fires right up!

Its not like on a gasoline engine where the incoming air charge needs to be humognious and volital in order to ignite.

Remember that in a diesel it is pressure and heat that causes combustion of the fuel not any sort of vaporized fuel or spark.

So I really think injector spray pattern plays little role.

Peace&Love :D, Darren

Navigation

[0] Message Index

[#] Next page

Go to full version