thast pretty gnarly. they used to use turbo fed superchargers on old diesel engines same kinda concept i guess. its not really logical but it looks rad.
It's certainly a purpose built showboat. It runs eleven somethings if I recall right. My friend Mark built the valve covers for that car. That car was wrecked bad while inside a trailer and rebuilt.
detoit desiel used to make a v-8 that was blown and turbo charged, they were used mostly in firetrucks. there are still some of these out there, and they come into our shop every once in awhile. today, caterpillar is making a twin turbo inline 6 for semi trucks...it's a baaaad motha as far as diesel engines go. the gto makes me wonder if one of those blowers is fake. it runs 11's in the 1/4 ? i had a 70 nova daily driver, with a 468, single 4 barrel, and a 3:23 geared non-posi 10 bolt rearend that ran 11's on 8 inch wide cheater slicks. with dual blowers and all that chassis...11's isn't impressive.
i agree. thats the Fast and the Furious mentality there. 'I need N.O.S..Better make that two bottles!"bullshit
Definately have to agree. Out of all the years of helping build, building, and helping set up blowers for people, I have had ohh about three people ask the imfamous question "Can I put a blower on top of my blower to supercharge the supercharger?" I have never to date had to deal with it though meaning I havent yet had a problem talking them out of doing that. It is a waste of money mainly. I "guess" it looks cool? Definately in the eye of the beholder! Heres just yet another reason why... Heat.... Blowers do one thing well, and that is generate heat.. So basically the people who asked me that question, I should have answered it better with "SURE, you can superheat the intake charge and help detonation jump up a bunch!" Two blowers on top one another like that, to me, yes is a waste of money, and you arent gaining much of anything doing that except a BUNCH more heat on the intake charge before the air gets to the cylinders. Just helps detonation all that much more! And I dont mean for the better. A diesel engine, sure! But even Detroit Diesel was smart about it all.. They used a turbo on top of the blower. BUT a two stroke diesel engine needs a good amount of air to clean the cylinder before each power stroke thus the ports in the sides of the cylinders. Making more smog than a typical 4 stroke diesel. Thus the EPA dont like um...(two stroke diesels that is.) Lain
and here all along I thought the first car in the thread was hokey as all get out. I see now that I was mistaken, this ones worse.
Hahah!! I guess they did it because "both" of them could ya know.. Thats the only thing I can come up with. They must have had two cores laying around and said to themselves in a flash "WHAT IF" Hahaha!! The part that bums me out is that they must not have read my footer on my posts! I am always looking for cores! Hahaahahah!!!! Lain
I built a 'Rat Fink' model like this motor when I was about 10 years old. It looked rad on a cartoon T-bucket but this is just dumb. I was wondering if BOTH blowers were fake.
I know Steve did that one on his flathead with two 4-71's just because thats the kind of stuff he does.. Hence Uncommon Engineering... But you expect that from Steve, He has done some really bizzare engine build stuff over the years. My shop I am a bit more practical. One off's are cool, but not cost effective by any means. I am sure thats a big part of why a lot of guys have a hard time finding someone to do crazy things like stack two 6-71's atop one another! hahaha! Lain
I am guessing you are probably right...well at least if they really still wanted to "gain" anything from that setup.
Not to mention the weight savings... Part of why their setup went as fast as your natural aspirated engine is because they were packing around about 200 pounds more uneccessary metal. 6-71's by themselves weigh in at 58 pounds alone with nothing else on them.
I do understand the "do it just because we can" mentality I turbo'd my Harley, just because, no other reason.
I believe all the 92 series Detroit Diesel engines were turboed into the blower. remember that on the two stroke GM deisel design the blower does not produce boost. It only pumps air in because the normal two stroke piston transfer port can not be used. The famous Auto Union Gran Prix cars of pre war days were twin blown, a larger blower into a smaller higher boost blower into the motor.
Can I take a copy of these and put them up on my web site? I would like to put them up on my "various blowers" image page. Yeah, two blowers are not crazy if they are done like this, and are set up right. The dual Magnuson setups are out there, and becoming more rare to find. They fit up on a small block chevy setup... Now that kind of a dual blower setup, and like what you have here looks cool! Lain
While I really do like blowers, I honestly have had NO hands on experience with them, SO please answer this "rookie" question... When that GTO is idling, the motor is reving up and down, although (and I looked real hard at wether the throttle linkage moved at the motor) the guy is NOT tapping the accelerator pedal. What is the reason that motor revs up and down like that? Is the cam SO huge the motor is trying to catch up with itself?? I have seen blower cars at local shows and they sound NOTHING like that, (i love it, the sound not the car) Thanks,...Ken I just watched it again and I guess he IS tapping the throttle at first, but NOT the whole time, he is actually "leaning" out of the car a bit to back it up?!?!?
I watched that video a couple more times and the only thing I can think as to what you are saying here is that (and this is a shot in the dark even with as much as I have dealt with blowers and blown motors) the blowers tied together like that will be creating basically two different atmospheres... Meaning..(while the throttle is left at idle)...Top blower is the "primary" blower pumping air from outside...Secondary blower is recieving a "higher" pressure charge of air periodically from said upper blower (this charge would almost not be measurable but is just enough to surge the engine) and is also receiving a near zero "charge of air to almost a "vacuum" situation through what is called "parasitic loss" in blower lingo to the second lower blower... Now, in lamens terms "Parasitic Loss" is just air that blows back around the rotors because roots blowers are not perfect and cannot "seal" to the case keeping air from escaping back to the top of the blower...make sense? Ok, this surging, caused by BOTH blowers "parasitic loss" actually does what I described above, "One feeds the other and leaks back into itself with 'parasitic loss' causing what I decribed above as "pressures" and "vacuums" back and forth to one another. Keep in mind this is while the butterflies are closed in the carbs at idle... JUST enough air gets past the "idle" carbs to help this out... Letting the two blowers surge one another back and forth...until the throttle is opened up.. Then the Top blower can do what it is supposed to do and that is feed the uuhhhhh well, other blower in this case rather than the engine. That "surging" would quit after you allowed the engine to breath by opening up the throttle. Now... To sum all this up.... BUY A SINGLE BIGGER BLOWER... and keep that intercooler he has on there with it... Hahah!!! You would be WAAAY better off if you were this guy... I am guessing here... But I would think that the "dual blower" setup he has here would have a bit of a stumble off the line from idle to WOT...just a guess given the understanding of how blowers work.. Booooy GM just had NO idea what they would be starting by putting blowers on diesel engines! Hahaha!!! Lain
God dam it!! I was thinking that but forgot to type it!! Ha Ha Ha, all that money going down on some half ass wood! Even though the metal ramps are under it, it is still lame, along with the blower set up!! Even though Imurf gave me an excellent explanation, ...Sorry I am still lost?!?!? I understand what you are saying, I just don't get it----> it's me!!!
The Jalopy Journal
