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Going along with sreid's prediction, it's important to realize that current gasoline fueled engines have higher potential that what we see in production. Here's a quote from David Vizard on the subject, when reading remember this was 30 years ago: "In 1975 I was the lead engineer on an economy...

As Peter7307 clearly stated earlier, the future of the automobile is in the hands of our leaders. "The most difficult item to pinpoint is the direction of political policy which is also one of the most influential in this arena."

SomptingGuy, When looking at the facts, it's easy to consider conspiracy. VW can no longer sell the 46 MPG turbo Jetta in the US because it does not meet emissions standards. On the other hand I cannot purchase Honda's ultra-green Accord that emits near-zero pollution. Under terms of the...

Greg, Why do you consider H2 a joke fuel? BMW has completed a 100 car restricted production run of the powerful BMW Hydrogen 7 model. With a 260 HP dual fuel V12 engine and top speed of 143 MP, the driving range is 125 miles on H2 and 300 miles on gasoline...

According to BMW the future of the automobile lies in hydrogen power. http://www.bmwworld.com/hydrogen/stragegy.htm "The hydrogen age is here. Mankind's search for increasingly environmentally-friendly individual mobility and independence from fossil sources of energy has led to a...

Here's a link to some testing done for Briggs & Stratton on a flat head modification. The results show substantial reductions in BSFC. http://somender-singh.com/content/view/12/37/

As opposed to increasing spark energy, consider adding additional kinetic energy into the air fuel charge at ignition and during the early stages of combustion. It's proven that increased turbulence intensity reduces cycle to cycle variation, reduces burn duration and establishes a more...

Excellent post mattsooty, can you tell us more about altering the three combustion phase percentages? Here’s a writing on the effects of turbulence on combustion in two strokes, instructing. http://home.earthlink.net/~scloughn/id21.html "...As the piston displaces fluid during the up stoke...

"1. If reversion is really coming from cam selection, does it make sense that 213 duration should show a significant difference?" I believe that something other than camshaft selection is the primary cause of the reversion. If it were the cause I think you would have determined it with the...

I recently read a very good Paper on the subject of intake bellmouth shape and it's impact on cylinder filling and spit back by Prof. G. P. Blair. http://www.profblairandassociates.com/pdfs/RET_Bellmouth_Sept.pdf Two more papers on intake sizing...

Looking at the cost savings at the pump exclusively may not show the complete benefit. If fuel consumption is reduced by 100% then we should realize similar reductions in HC and CO emissions, more valuable that the personal savings. In addition supply and demand of fuel should drive fuel cost...

Yes Pat two carbs would eliminate that possibility, it would then be like tuning a single cylinder engine. I read this tonight on harley tech talk: If you've ever watched a bike on a dyno with the air cleaner off, especially one with a healthy cam, there is a nice big cloud of fuel/air...

I keep coming back to combustion problems creating high cylinder pressure during overlap but everything you describe relates to good combustion efficiency. Have you giving much thought to what phase each cylinder is in during the overlap period of opposite cylinder? Here's a link to...

v114, Are you experiencing any detonation?

turbocohen A quick search finds this: "Indolene is used extensively as a standard certification fuel in both the automotive and oil industries" Is there something about the chemical composition of indoline that helps to control radical formations?

We will see fuel consumption reductions when it becomes a priority in this country, the technology to do so is in production now. Several years ago you could buy a inexpensive, comfortable Volkswagen turbo diesel here in America that could get 46 MPG, it’s no longer available here, something...

FoMoCoMoFo, no offense intended, we agree the solution is to look past the reversion and find the cause. With 2 valve heads and 4 into one headers the results can be amazing. The picture below is from Larry Meaux, an awesome example of completely eliminating reversion. v114, I can't answer...

IMO reversion at RPM is a major restriction on archiving optimal VE and power potential. At speed the time to fill the cylinder is very short, when the intake valve opens the first and only movement should be into the cylinder. To accomplish this the pressure differential between the intake...

Short of pulling the heads for inspection several indicators can be used. Excessive EGT, intake inspection, spark plug inspection and exhaust inspection. (dry/white deposits = good combustion heat; wet/black deposits = insufficient combustion heat) Here’s a good ink to reading plugs...

One thing to look for is incomplete combustion. If the flame speed is too slow it will continue to burn during the camshaft overlap period causing excess pressure in the intake tract.