|
|
Post by dani4JB1T on Nov 5, 2004 10:52:58 GMT 11
|
|
|
|
Post by namic69 on Nov 10, 2004 18:12:47 GMT 11
well funny that you should ask. I have been lookin at the Bully Dog system and between myself and a good mate we are going to build our own systems for my 96 Bighorn and his 95 VX Cruiser.
Will post when done. Planin to dyno truck b4 and afta
|
|
|
|
Post by Graham on Nov 10, 2004 21:46:36 GMT 11
I'm interested in this type of stuff too, especially with Diesel fuel costing over $1.10 / L here is Sydney now and with my MU having worse mileage than when I bought it! (500Km from 60L or worse)
Graham.
|
|
|
|
Post by dani4JB1T on Nov 11, 2004 0:31:01 GMT 11
I`m very interested too...
Namic69...good luck with your DIY experiment. Then you can write this mod such an article. Take care do not over rev too enough the engine and take care with the stress in the trans parts....remember you can win 100 extra HP....it`s a lot !!!!!
we`ll be waiting for your results... !!!
cheers !!!
|
|
|
|
Post by namic69 on Nov 11, 2004 17:19:35 GMT 11
Well my m8 is an engineer and I am an electrician so I think that between the two of us we can sort it, the major problem so far is finding a LPG tank that has a vapour take off, I am told that they dont build them with one these days so I am looking for second hand tanks. I am looking at doing a hash job to see how well it works before I go to too much trouble....
Will be fun and if it looks like custard I will go to nitros.... :-)
|
|
|
|
Post by geeves on Nov 11, 2004 19:22:27 GMT 11
use a regulator for a petrol to lpg conversion and you should get a reasonable result The LPG tank needs to be certified to get a warrent but any bottle should do for testing. Nitros wont work on diesel very well as nitros is a oxegen substitute and is sprayed in with extra petrol Diesel engines get more than enough oxygen its more fuel that they need in a burnable form and diesel burns to slow to burn just more fuel
|
|
MattMU
Isuzu Senior
Rodeo Now!
Posts: 206
|
Post by MattMU on Nov 12, 2004 11:09:41 GMT 11
Hmmm, I would disagree slighlty there Geeves, MOST diesels dont get enough oxygen to burn the fuel they have hence the black smoke...pure fuel!
Many reasons for it, but its the main reason we force induct diesels nowdays. The turbo allows for more oxygen to be introduced to increase power by giving the fuel enough air to burn.
I agree (without study) to the comments on the nitros, the propane wont self ignite under compression, hence why its useful in a diesel, but Im not sure how the Nitos would go. Might get pre ignition and colliding flame fronts in the combustion chamber, big expensive bang!!
Matt.
|
|
|
|
Post by geeves on Nov 12, 2004 16:23:36 GMT 11
Diesels only smoke due to exess fuel or poor atomisation. Excess fuel would be noticed with poor power and economy.Poor atomisation is the normal cause as bigger droplets take longer to burn. The quality of the diesel also plays a part here The exhaust gas from a diesel running at full noise still has enough oxygen to light a candle even with smoke. Modern diesels with supper high injection presures and smaller injectors spray better so less emisions and petrol like perfomance
|
|
|
|
Post by Andrew on Nov 12, 2004 17:15:30 GMT 11
you are both partly correct...
the design of a desiel motor will not allow 100 of the fuel to be burnt in the pot, hence the reason for the smoke..
the LPG injection allows 99% of the fuel to burn hence the reduction in smoke and an increase in power.
Only a small lpg tank is needed as you are only introducing a very small amount into the pot with the desiel fuel.
I think if you search the forum for LPG injection there are some really good web sites listed that give detaisl on how to do this.
|
|
MattMU
Isuzu Senior
Rodeo Now!
Posts: 206
|
Post by MattMU on Nov 12, 2004 17:19:42 GMT 11
Yep that is right!! These modern diesels have awesome spray patterns that allow the diesel (flame front) to reach the oxygen throughout the entire combustion chamber, otherwise the fuel is exhausted as black smoke.
And yes if there isnt enough air/oxygen, (or poor atomisation, bad spray patter, blocked injectors,, carbon build up, injector dribble, low injection pressure, uncalibrated FIP, weak delivery valve, weak injector spring etc etc etc etc) dumping more fuel in does lose power and exhaust all that fuel....as black smoke!
But...everything else being equal, the diesel will reach its maximum volumetric efficiency (peak power)about the time it runs out of burnable OXYGEN! (ie flame front travel and the time available during the passover of the power stroke) Proven in the application of fitting a turbo to a naturally aspirated diesel motor!!
No offence Geeves, Im certain forumites appreciates your invaluable contribution to this forum and I apologise if you were offended at my initial reply. I just thought the origional comment of "Diesel engines get more than enough oxygen" was a tad misleading unless you are very familiar with the theory of the diesel engine cycle.
|
|
|
|
Post by geeves on Nov 12, 2004 19:07:56 GMT 11
very sorry I see your point and understand now
alan
|
|
|
|
Post by dani4JB1T on Mar 21, 2005 12:30:26 GMT 11
hey namic69 how goes your project  ....it´s already working?? I can´t wait to hear good results...hehe  byee Dani |
|
RoeDao
Isuzu Junior
If you notice this notice, you will notice that this notice is not worth noticing
Posts: 52
|
Post by RoeDao on Mar 31, 2005 21:19:29 GMT 11
that is very interesting!! worth considering!! ;D
|
|
|
|
Post by namic69 on Apr 5, 2005 6:41:20 GMT 11
Well I got around to it at last. Using my BBQ gass bottle and reg we hooked up valve to the reg to better control the amount of LPG flowing into the engine. On the top of the airbox of my 96 bighorn is a breather for the fuel tank, so we pulled that off and put the LPG in there. Then we found a piece of road and did some tests. 0 - 80 without = 13.6 s, tap on 50% 0 - 80 = 12.4s, 0 - 80 100% 11.3s.
All the runs were done on the same piece of road. The system is rough as turning up full while idling causes the engine to run rough but fuel demands at 2000rpm make it smooth.
Am going to play with it for a few days and will go from there.
|
|
|
|
Post by namic69 on Apr 5, 2005 20:08:07 GMT 11
Well I have played some more and this time I put my truck in power drive and tried again. Now I would like to point out that it is bloody hard to drive, work a stop watch and turn up the LPG as I accelerate but,,,, 0 - 80 km on a flat road @ 10.54 seconds ish. If I had someone workin the LPG it might go faster but I am a little concerened about what the extra H.P might do to the running gear? you know those important little parts like pistons, turbo, seals etc......
|
|
|
|
Post by Jimmu on Apr 22, 2005 8:06:36 GMT 11
Cool.
What volume of LPG are you delivering into the system?
Did it reduce black smoke from exhaust?
I guess the next step is to get it rigged up to work automatically?
Maybe something hooked up to the accelerator to switch on when it is on the floor?
You are a pioneer! You dont worry about such things as pistons, turbos or seals...
Jimmy.
|
|
|
|
Post by namic69 on Jul 15, 2005 6:24:08 GMT 11
--------------------------------------------------------------------------------
Well I put my 96 Bighorn on the dyno today and here are the results.... First the mods...
2.5'' exhaust back to turbo, K&N air filter, ERG valves disconnected, X1R to oil, Boost compensator = 12-13 PSI boost
Run 1 with above only = Peak Torque = 363Nm@ 80.6km/h Peak Power = 61.5Kw @ 102.1km/h
Run 2 with LPG fumigation = Peak Torque = 427.8 Nm @ 67.6km/h Peak power = 73.7Kw @ 96.8 km/h.
|
|
|
|
Post by Jimmu on Jul 15, 2005 18:48:36 GMT 11
Great effort!
Love your work.
Jimmy.
|
|
|
|
Post by namic69 on Jan 12, 2006 19:09:17 GMT 11
Well it has been a while but the system has developed further, I have purchased a boost pressure switch (factory setting at 6 PSI) and have installed that with a electric solenoid. Well blow me over with a feather....
When boost pressure gets to 6 psi the switch turns on the solenoid so LPG flows into the engine ;D ;D ;D ;D ;D ;D
Generally at 6 PSI the engine is revin at over 2k so I have turned the tap on further to allow more flow and Damn the extra power is noticeable.
With the BBQ reg in use even if I turn the tap on full as I have done on more than one occasion, the engine handles it well (at least no big bang yet) and best is when I take my foot off the gas the system turns off so the gas bottle lasts longer.
Usually I only put the bottle in when I'm towing or 4wd'n.
|
|
|
|
Post by namic69 on Jan 12, 2006 19:10:50 GMT 11
But damn this mod beats all the others put together for extra power.... As the dyno results show.
|
|
....it´s already working??
