Interesting Don. I've never heard of this contraption, I'm definitely interesting in seeing/hearing more about it.

Those slant 6 produce some respectable torque.

Here's my daily driver when I was in college.

And that is without braking. Tough, cheap, fun and reliable.

The only draw back I can see and It shouldn't  be a huge deal if it is only used in short spurts. Is there is no way to adjust the fuel volume with the increased air . So if your carb is setup properly under normal conditions the boost would lean the mixture while it was on. or am I missing something.

this sounds kind of like those useless electric superchargers that people were getting tricked into buying off ebay.  boat engine bay exhaust blowers is all they were. 

Don wrote:

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 I read an article about an experiment GM was doing with passive supercharging using a form of air entrainment. It was written by Rodger Huntington I poked away making the parts one by one.  Initial testing is encouraging even if it is only on the bench. Using only 120 PSI in the entrainment jet I was able to produce positive pressure in the diffuser and a definite neg pressure in the air cleaner housing.  In the article they were able to produce and sustain 4 lbs boost for 15 seconds. They used a hi supply tank pressure and charged it with a belt driven small compressor or an electric compressor. They then used a 150psi regulator to maintain no more then 150 psi to the small entrainment nozzle. They said the entrainment nozzle pulled 8 times its own volume into the system. Where this will all lead who knows but it is certainly interesting fooling around with it. I have a stock slant six with low Kms (30,000km) I have sized everything for this engine. I would like to put it in the VW gasser with the passive supercharger deal for some just for fun testing. GM was claiming 40% increase in power and was exploring this for use to boost power for passing without requiring engine mods . So 40% on a slant six would give and extra 58 HP or 203hp. Not much you say? Really. When was the last time you saw a 203 HP VW Beetle? Anyway I will take some photos later and stick them up here. Time will tell if it was worth the effort or not.

don
-- Edited by Don on Wednesday 7th of May 2014 10:23:41 PM

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 at the same time, they were trying to reduce the combustion chamber size with water injection,, and H2O had oxygen.. but it had its problems ..
I think they went on to find a way to put air entrainment in the fuel,,, oxygen bearing fuel like ether.. and that is what we are burning today..  MTBE .. which allows the fuel mfgr to make low quality fuel,, but wake it up with the additives.. and it burns "cleaner" ,,  as there is more air in the fuel mixture going out the tail pipe, so less parts per million...

http://en.wikipedia.org/wiki/Methyl_tert-butyl_ether

some track racers still put ether in the fuel ... at tracks that don't have a method to test fuel..

also,, Nos can be used to get the oxygen in...  

so,, not knowing about the method you describe,,, is it for general use in my driver,,, or just to win races.?

I see 200 + HP vw beetles frequently btw.. they are at the drag races all the time...

June 1 2014 Vw fun

The volume of air needed for even 4 lbs of boost will be the major factor.

Cool fun with cars though.

The volume of air needed for even 4 lbs of boost will be the major factor.
That is an interesting subject. I have a cousin Cecil Farrington who is big in tractor pulling. Cecil built a tractor some model of International that used a 6V71 Jimmy diesel. The association wouldn't let him run it because that engine has two superchargers and their rules allow only one. The engine was turbocharged as well as having the standard roots blower to supply the intake air that all Jimmys do. So Cecil being the crafty little begger he is removed the turbo, built an air box with a air solenoid operated valve, hooked up a truck air brake tank system and a regulator assembly along with three truck air tanks and proceeded to show them how it was done. I have seen it run and it is impressive to say the least. He has run it now for several years. I asked him about it and he told me he still has air left at the end of a 300 foot pull. He suggested I install a system on my rail to feed the slant six using a Scott air tank bottle for supply. He said it holds 84cu feet of air so figure out what the slant would use in 1/4 mile. I did the caculations at full throttle 6000rpm for the whole quarter mile and guess what? 63 cu feet! Now the engine wont run at 6000 the whole quarter mile so that would still allow a fudge factor. Cecil btw gathered up everything to make it including a scott air bottle from his personal stash of spares and was all gung ho to help me install it providing I would provide a 1/4 thick steel shield for the bottle if mounted near the engine. I waved him off. Not because I have any doubt it will work after seeing his success but because at my age I am not ready to sit behind a 700 to 900hp slant six. (Kenne Bell once said in an interview they tested a slant six at about 30PSI boost and got that kind of power on it.) Cecil has his dialed in a 28lbs boost but it is adjustable if competition gets tight. ) I can barely handle the approx. 280hp I have now and would prefer to live a few more years. When you do the math for 1/4 mile it is surprising how little actual air is needed. We are used to calculating for CFM but if you count the actual number of revolutions The engine makes in a 1/4 mile remembering of course that a four stroke makes two revolutions for every one cylinder filling it is not that much actual air on a small engine like mine. A slant six or a Buick v6 for that matter (same size, both motors)have a swept volume of one American gallon.
BTW Mickey Thompson and Danny Ongias were playing with a similar deal on a SOHC power funny car about the time of Mickeys murder.
don

-- Edited by Don on Sunday 11th of May 2014 08:08:20 AM

-- Edited by Don on Sunday 11th of May 2014 08:17:29 AM