Hi Kevin,
is it one these ?
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Hi koen 'yes mostly wood gas,posily propane boost add in fuel.i have the old 6.2 probbly same on thr 6.5 gm.if i go that rought i will contact you. Thanks. At this time i am just thinking on another motor.as the one i bought off craigs list had about 6 cracks in the block on the 350 gas i was ready too install with new gaskets.I gess i dont trust any bodys word these days on sales with out receits/with writen garrenteed.It seems the 6.2 would be a heavy duty 11 or 12 too one engine, and bolts up too any old chevy transmission. PS the bore is 4.068 or just over a 4 inch bore.an old 11.5 too 1 compression piston in my 350 chevy block, and some liquid voluem checking should get close, enough for wood gas or gasoline.
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just not exactly sure on the spark plug location and the best trigger methed for the coil or coils.?? Other than the psi injection systom used for psi signals too moduals too coils. ??
Hi guys,
Been driveing home from a night shift today (DOW ofcorse) and while l was adjusting the a/f mix it occured to me.
What if one wuld take a diesel engine, unrestricted by means of gas/air mix throtle like a petrol engine, and throtle it only by the gas mixing valve?
Lets say you drive a clasic spark ignition woodgas truck/car. You press the pedal to WOT and hold it, only throtleing with your gas mix lever. You throtle by changein gas/air quality (reachness) rather thain quantity (volume).
Can be done, did this a couple of time when my TB froze open.
There is always enough air and pressure for the diesel to ignite.
The unrestricted diesel engine advantige remains.
The engine doesent work at a vacuum-no oil sucking.
What remains is possible injectors overheating.
Any thod? I do have a nightshift behind so l might just talk crap 
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Hi Kristijan,
The new style diesels have a throttle nowā¦, electronic injection, electronic timing and ā¦ a knock sensorā¦
Driving the old diesel with an throttle valve would mean that the oil would get sucked by the valve stems ( no seal) and or the piston rings on throttling downā¦
The new diesels however, are easy to adapt to run in dual fuel mode / hybrid, with mixtures 70/30 woodgas to diesel without bigger adjustments.
Isuzu even has a standard methane / diesel engine on the market .
The old knowledge of gasifying with the new era of electronic controlsā¦ any idea can be madeā¦
Next on my try out list is the use of mixing some HHO , from my old HHO generator, with the diesel/ charcoal setupā¦
Some HHO could help with your system to i guess ? worth tryingā¦
I might be not posting to much these days, but i do read and follow most of the topics, including yoursā¦
Keep up the good work and postingsā¦
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Hi Koen,
I undarstand throtleing a old stile diesel is unpractical. Reread my post. I was thinking to meter wood gas similar as diesel is metered in a diesel engine.
In a petrol engine we meter the amount of fuel/air mix, in a diesel we just meter the fuel.
I was thinking of a unrestricted diesel engine intake, just meter how much gas gets mixed with the air.
Idle shuld be at lower thain woodgas/air mix combustion ratio, to maintain the charbed while diesel provides idle, full power when adding in enough gas to maintain a 50/50 mix.
Ha, looks like you were buisy your self!
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Good morning Kristijan .
This may be the way you were thinking of throttling on diesel.
Edit ; I just relized this video is already on this thread. I tried to delete but couldnāt 
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Hi Wayne.
Yes! This is exactly my thinking!
Funny, you seem to be one step before us allways
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Hi Kristijan,
Indeed, i drifted away from your question.
The good news, you can always try to do WOT and throttle your gas outlet from the gasifier, wonāt be that easy ā¦
( the engine would get always 100% air but how could you replace some of that air if you donāt throttle the air at least ? You need the vacuum from the engine to suck the gas from the gasifier toā¦ )
The diesel conversion need some more attention to actually having an usable power output from your engine and not revving up and down onlyā¦ trying to find the needed balance and the correct injection time with only the gas throttelingā¦ i think it would be WOW with DOW 
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This is something I played with on one of my clones. A blower was used as the throttle. Find the link for the puff.
http://gasifiers.bioenergylists.org/node/1188
I forgot all about it.
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Koen,
Yes, throtle it with a air mixing valve. Restricting air flow. Shuld produce a lot less vacuum thain a homogenous intake throtleing. Or, have a slightly positive CONSTANT pressure of gas and throtle it in, like Jeff.
Jeff, l am still trying to figure out why it worked with wood but not charcoal.
This was a spark engine right?
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I think I may have also had some comments on this way-far back up on this topic.
So I will try not to repeat.
THE MISTAKE is developing isolating out to one step, ignoring all other phase/steps.
The easiest way to feed a compression ignition engine (a diesel engine) woodgas is too pressure BLOW the gasifier unit.
Have that blower system large enough with a command variable speed. Relativity easy now with PM blower motors and electronic power supplies. Exhaust sensors, feed-back control loops.
The the ādieselā stays with expected intake characteristics.
O.K. Easy enough to āarmchairā solve this.
So . . . what are the problems?
Any pressurized gasifier on a vehicle will become a sure human killer. Too many in cold climates will want to garage it. Long tunnels, waiting. Even multi-level parking garages. Ferry boats sitting loading/unloading. You just cannot prevent this abuse. Even an engine sucked-safe gasifier can kill being system shut down and still heat self-pressurizing/producing . WHY the required operators licensing in Sweden and Germany WWII. To be taught, and sign off knowing the Know-Noās. THEN the registered Operator would go to jail for the gas/accident killings.
Another problem converted ādieselā problem set: there are many different types of diesel fuel injection pump systems. Some NEED full flow bypassing to cool the pump and the injector tips.
Re-read the diesel conversion section of the Swedish Experiences Report.
Net look up and read in-detail the Elsbett Engine vegetable oil conversion site for diesels system they can; and cannot convert not damaging the pump/injector systems, for hints.
Another in-use problem set detailed in the India Institute of Science / Combustion Gasifiacation Propulsion Lab information use data base. As a suction system for big diesels in stationary use they ran into severe problems with overfueling and underfueling swings as the electrical loads were cut-in and cut-out by the electrical demand/users. Producer gas still wanted to flow heat-angry driven. Producer gas reluctant to get flowing past system restrictions and lazy-idle-heat.
These fuel rich/lean swings would cause either back into the intake back fires. Or blow out into the exhaust stream.
They did try some evolved mechanical/vacuum/flow solutions to this. Concluded it would need high speed digital electronics solutions.
Once at that level it was just much easier to just buy/obtain, have engines supplied that were spark ignition converted.
Francois Pal shows one of these big multi-cylinder industrial (former diesel) engines on his development topic.
This is what Chris Seymour is using now on his systems.
More examples of just going easier command controllable spark-converted direct, practical are out there.
Too many diesel engine lovers are like party cake eaters. Love their cake at the exclusion of all sense.
āWant their pretty cake. Be able to eat it too; without getting fat, decayed teeth, refined wheat and sugars nutrition starved sickened.ā
Ha! I own and use both. My heavy oil compression ignition engines will stay heavy oil engines. There are lots of other fuel oils other than Top-Down supplied pump Dino-deisel.
And I will eat one small piece of cake too at parties. Smoke an offered celebration Baby cigar. It is only polite.
J-I-C Steve Unruh
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āAnother problem converted ādieselā problem set: there are many diffnnert types of diesle fuel injection pump systems. Some NEED full flow bypassing to cool the pump and the injector tips.ā
Thats enough to draw me off dieselsā¦ I knew about the tips but not the pumpā¦ Thanks for a good response!
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I guess I need to read it because I donāt recall using charcoal. But Iām sure the charcoal gasifies improved since then. Maybe a bit of tar and more hydrogen helped. I also bet the size of my charcoal was too large.
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I know this post is on hold , though i have an old 6.2 desiel truck. 1985 and if i were too mount spark plugs and use a throtle body too control the the wood gas, would there be some sort of problem with the oil consumption from valve seals.?? Due too adding the throtle bodly ? And how thick of a spacer plate would needed too get the compreasion down about 12.1 from the factory 21.1compreasion ratio.Thanks too anyone that can help on this equation.
Hi Kevin,
Can you get me a bit more detail about the engine in question, i will dig up some info for the conversion
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SpƩcialise Gilles vaitilingom duelfioul with syngas
Hi koen thanks for your expertise on all the wood gas char gas conversions, i am just thinking how i would like too wood gas a 6.2 chevy desiel engine that is in an old 1985 chevy truck, the pump went out and i dont want too burn any desiel, 100 percent wood gas. The book say its 21 too 1 compreasion, it might be a bit lower as its got many miles on the motor. If wood gas is too much rigging i may just mount 350 chevy gas motor in its place, though i just dont know how too measure the voluems too lower the compreasion down too around 12 too 1. The bore is i think 4". Allso i wounderd what the torqe forse would be useing wood gas at 12 too 1 compreasion compared too desiel at 21 too 1 compreasion, as far as crank shaft wear and tear.?
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Hi Kevin,
Can you confirm if its this one ?
V8 diesel
http://www.duramaxhub.com/62-diesel.html
if so, its an indirect injection, meaning the head has a chamber to pre ignite the fuel.
Can be easy modified the CR just by enlarging / opening the chamber towards the piston side.
I will have to look into that
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Koen the 6.2 Detroit is a V8 diesel. It is notorious for bad heads somewhere in the casting there is a thin wall which cracks at about 200,000 miles if I remember correctly. My brother had one and we ended up buying an aftermarket set of heads for it. They also make less power then the newer duramax diesels that replaced them. I have a 2005 duramax myself.
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