Quote:
Originally Posted by ctmaybury@yahoo.com
Would rear wiew cameras instead of mirrors improve your aerodynamics? Interested in your engine mods. Most of the year, my trucks (dodge 2500 isb Cummins) are at 45 mph on dirt roads in the mountains, so I'm focusing on volumetric efficiency and thermal efficiency mostly. Aero mods clearly your best bang for the buck. I wanted to pick your brain about lpg fumigation. You discounted it on the first post claiming engine damage from too much hp. Did you try multi stage injection? Did you limit the lpg to less than 25% of the diesel? If you run in the 10% range, there's very little rick to the motor. My homebuilt system is still in the design phase, but used it for a 4k mile trip with an 8k lbs travel trailer with good results. At the time it was 2 stage injection. Next gen will have 5 stages that key on boost pressure.
Total pre turbo exhaust header is in the works now (bundle of snakes equal length tubes). Combined with port matching and polishing should yield some ve gains. The lpg fumigation should yield thermal efficiency by adding additional cooling to the charge air (probably very helpful with your climate down under).
What about some of the other benefits of lpg fumigation? Longer interval between oil changes, quieter motor, less smoke, less objectionable smell to the exhaust. Some of those are very subtle but noticeable. Did you notice any of those? Lpg is cheap and convenient for me and the motor seems to like it with the right tune (injection timing lpg seems to have an advancing effect).
|
LPG fumigation nets about the same benefits as hydrogen fumigation.. However... LPG causes higher egt..
LPG in Australia is available everywhere but is about half the price of diesel... Whereas hydrogen in stored Form is harder to get.. But a lot cheaper.
Hydrogen in generated on demand Form is much closer to free... If you can find a way to generate it more cheaply than electrolysis methods (that use a heap of amperage that obviously counteracts the benefits somewhat). I am having 2 different hydrogen on demand methods looked at.. Using the Exhaust gasses and heat... (catalyst and also plasma reformation methods) both are looking promising atm. If we can generate as required with little external.. And take advantage of waste heat and gasses we have nirvana in effect..
Current testing on the non productionised hydrogen on demand systems we have in play show huge benefits around 35 percent fuel savings.. 70 percent reduction in nox, and a huge reduction in particulat matter. Whilst also increasing performance throughout the rev range
Water looks to stack well... It decreases egt further.. Has been tested so far at 25 percent of fuel volume.. And.. Increases performance again except for the top 1/3 of the upper rpm... (which drivers should never be using regardless)
The total costs for all the aero works... And the engine supplement works should be around 2/3rds the cost of an engine upgrade to a Cummins isx e5. (we have performed a few upgrades... And including exhaust stack removal and some intake mods etc during conversion we only get 10 percent improvements to fe)..
Might work out more cost effective to buy older trucks.. Refurbished the engine and add ancillary changes and aero in the long run... Instead of spending big dollars on the latest trucks to gain 10 to 15 percent fuel..
Spending /1/5th the upgrade price modifying old units and getting 50 to 60 percent or more gains might be smarter... At least until hybrid trucks like the Nikola One or equivalent hit the ground...