Cheers for the heads up Mike. Maybe i need to try running my gas butterfly fully open and adjust the air butterfly to suit....
currently, i open both air and gas butterflies a tad sort of equally depending on demand
At present i have a 2" ball valve between the 45 gal barrel and the oil bath filter..shutting off the gas from the gasifier.I have been deliberating wheather this needs to be a 3", the same as the rest of the pipework from the gasifier into the barrel. That would mean that i will have to open up the pipework either side of the valve also as this is 2" from outlet of the 45 gal barrel more or less to the engine.(3 feet of pipe) I had thought that the cooler gas takes up less volume, ergo a smaller dia. run of pipe would be ok
This valve gets shut after run down and so is shut ready for start up next time.
--- In WoodGas@yahoogroups.com, "Mike LaRosa" <ook187@...> wrote:
> Gareth, I have generally put a gate valve in the wood gas line to the engine to completely shut it off during start up and after shut down so smoke does not migrate to the engine and condense there. Note I differentiate between wood gas and smoke. I have had some problems with the seals in the plastic gate valves breaking down and then getting sticky and hard to work. There is no tar in them but the rubber seals in the valve stem break down and goo up. On my trailer I do not have any valve in the wood gas line to the engine. I pull the elbow that is attached to the rubber flex hose off and then start the gasifier. I hook the elbow back up once the gas cleans up. I can push it all the way up front but I usually start on petrol and pull it to the engine. When I shut down I usually pull the elbow off and cap the wood gas line to quicken the shut down of the gasifier and to prevent the migration later of smoke. My truck has been stalling while idling on petrol when I disconnect the the rubber hose from the gasifier and the engine gets it's first slug of air instead of woodgas. I figure the computer sets itself in a whole different range and needs a few seconds to get caught up or needs the key turned off and turned back on. I never had this problem before the trailer which puts out way more gas and of a higher quality. At the engine I just have a single butterfly (choke) to adjust the air. When it is closed the engine theoretically is getting fed 100% wood gas. Of course I'm such a sloppy builder and do not ever glue my plastic joints so there is plenty of air getting in. After I'm rolling and the gasifier warms up I can blend in progressively more air. When running at higher RPMs I can blend in even more and get to advance the timing a bit more as well. Mike L
> --- In WoodGas@yahoogroups.com, "Gareth Woolley" <garethwoolley@> wrote:
> > Hi bruce. I have that clear plastic vacuum pipe coming off the last filter and it seems clear as a bell....but worth a double check before the dredded clatter! I know my paper filter is stopping fine soot but seemed free of tar after the last outing.
> > To all, I ve just come off my 101 club website and a member has posted some interesting photos of some obscure war time french (?) truck with an imbert gasifier set up. Worth a look, but it brought up a question with regard to the carburation of the wood gas.
> > This manifold fell vertically with air coming in at the top, wood gas entering from the front, engine sucking out the bottom. The air side seemed to have a butterfly but the wood gas side didnt....
> > I have a butterfly on the air and the wood gas streams and my mixture can be irratic at times. Is this why mine runs not at its best and is it normal to have just the one butterfly in the air stream?
> > If you follow this, you should get what i mean.
> > 101 forward control club/forums/workshop/back to the plan. Page 6 near the bottom. goodwood69 is me.
> > Cheers
> > G
> > --- In WoodGas@yahoogroups.com, "humble1a" <humble1a@> wrote:
> > >
> > > Hi Gareth,
> > >
> > > Have you checked the entire gas stream all the way back to the inside of the intake manifold and under the carbie for tar?
> > >
> > > Bruce
> > >
> > > --- In WoodGas@yahoogroups.com, "Gareth Woolley" <garethwoolley@> wrote:
> > > >
> > > > Hey all, i ve not long come back from my first major trip out with Max and had a distance of 46 miles clocked up today. It was relatively trouble free in as much that the smaller wood chunks move easier through the hopper and caused much less disruption to driving or the need for as frequent jigging of the hopper. That said, the chunks may head further to the large chip size of things or at least 1" cube size, rather than the irregular sizes of between 3/4" cube to 3"x1" mix that was on todays menu....
> > > > I also still have to put extra heat sinks on the roof pipes and extend the capacity of the cyclone pot, which was FULL after the 46 miles.
> > > > I burned somewhere near 5x 60L tubs of the size mix wood chunks currently being served and had some largish lumps of wood cinder in the cyclone pot. I should have emptied the ash pot when i refilled the hopper, thinking about it and this would not have caused as much ash to build up in my 45gal barrel filter as there is....
> > > > But still no sign of tar at the paper filter stage ;)
> > > > This is a happy chappie
> > > > Cheers
> > > > G
> > > >
> > >