jackbombay said:I've run a few tanks with acetone and a tank the last 2 days without, I think it hel [SNIP] irly good at guessing what the MPG will be based on how I am driving, the acetone tanks all came out higher than I would have guessed.
Yes, they were all vented tanks filled to the tippy top.
jackbombay said:Winds were low to ......... my fuel from.
I can tell that you will never be satisified by any evidence provided by anyone on this subject as 2 runs can never be identical as during any "secnd run" (be it with or without Acetone) the car would have more miles on the clock which means it would be more broken in or more worn out, etc...
I know where you're coming from, unfortunately there is no way to completely isolate the Acetone variable. Anecdotal is as good as we are going to get unfortunately. I wish I could have two identical TDIs to run tests like this with, plus I'd then have 2 TDIs instead of oneJettaJake said:Your evidence is good and, I am sure, accurately reported, too, just pointing out it still gets filed under anecdotal.I hope you will continue taking and reporting data.
JJ
I agree with Dave. Surface tension can not be correlated to fuel economy(edit--to my knowledge.) Surface tension and b.p. depression are useful data to have, but neither can be correlated to fuel economy inside a diesel engine(?) The dyno test (as proposed previously) against a control sample and measuring fuel consumption with a graduated cylinder will be more definitive (elucidate causation rather than correlation.)JettaJake said:Nicklo's gracious offer was noted but I think the money would be better spent as a grant/incentive/reward to club member daBooj who has offered to generate some data in the laboratory. Much simpler to 'completely isolate the acetone effect' in the lab than in any TDI rolling on the road or on a dyno. I've got an extra ten-spot.![]()
Sure Dave. I'm teaching a bioD class this weekend but I'll call around Monday. **ties string on finger**djmeier1 said:Nick, could you take the time to make inquiry about dyno charges? It would be nice for all to have a good idea of the cost. Perhaps that would lead to a little broader showing of support. Seems like we are presently at about $90.00. Thanks, Dave.
nicklockard said:JJ, surface tension...has that been proven to be a causative agent in fuel economy differences? I'm not familiar enough with fuels chemistry.
HailTDI, what ever happened with regard to your January trial of a tank full with acetone. Should we just assume that the results were less than compelling??? Dave.HailTDI said:We'll see. I just added 2 oz. of acetone on a full tank. I have used it in the past on a gasoline powered vehicle, receiving mixed results. I will keep accurate tabs on this experiment.
Chris, it sounds like the study that we are talking about doing was done some years back...and with negative results! Would it be possible to obtain a copy of the results and/or conclusions? Perhaps it would put our questions to rest. Dave.cujet said:Years ago I got to play with a lab quality knock engine. It was designed to test fuels. The electrical output of this single cylinder engine was tied to octane, compression ratio (adjustable), ign timing (also adjustable) and throttle/mixture variations.
We tried every combination of fuel we could dream up. Acetone was (even back then) touted as an octane, MPG and power booster. From what I could tell, no fuel made more power than standard gasoline. And no fuel had better part throttle output than pump gasoline. There was not significant difference between 87 and 93 octane. Some race fuels made less power in this engine. However the knock resistance was quite high.
Diesel type fuels were a problem as the engine would not run well on them.
Certainly back then, acetone was not a "cure all".
Chris
Because why? Gas and Diesel are the same? And the engines that run these fuels are the same? How exactly are those results relevant to our cars in any way? None?djmeier1 said:Chris, it sounds like the study that we are talking about doing was done some years back...and with negative results! Would it be possible to obtain a copy of the results and/or conclusions? Perhaps it would put our questions to rest. Dave.
jackbombay said:Because why? Gas and Diesel are the same? And the engines that run these fuels are the same? How exactly are those results relevant to our cars in any way? None?