They have their issues, but with the efficiency of the IC engine still being relatively poor, maybe reverse-flow engines deserve another shot at the big time. The $100-million revamp was the pinnacle of old-school Chevy engineering, a host of simple solutions and tiny improvements executed in pursuit of power and efficiency. For maximum thermodynamic efficiency within an engine, the aim is to have as larger a temperature difference between inlet air and the temperature of combustion. When John heard Cob's idea for the reverse flow induction engine, aptly named since its air intake is in the rear and exhaust in the front of the car, he immediately jumped on board to help make it happen. It was also supercharged so they were able to force the intake air through the small exhaust. The body itself required several additional alterations.
Reverse Flow Small Block Chevy
TAKE MY ADVISE;I DON'T USE IT ANYWAY. Evans was understandably worried about the trade secrets he was being told to leave behind, but an engineer assured him that both facility and car would be locked up. Not remembering that in this particular Chevy engine tuning the key sent power directly to the coil, John pushed the knob only to have the car fire immediately. I've heard of this before but never really seen it done on a SBC. Bolt carburetors/injectors where the exhaust manifolds should be and make the exhaust exit where the intake used to be. Recently, I learned of a fascinating old trick that some hot-rodders used to get more power out of Ford flathead V8s back in the day, and I can't stop thinking about them. From 1992 to 1997, the LT1 helped pull GM out of the Malaise Era, updating the nearly half-century-old small-block engine for modern use. 72 Chevy swb step-side "LS" 6. A re-built 1968 Chevy 327 V8 motor with Chevy 400 heads is the real heart of the Reverse Flo car, as it is known around Pierce Refrigeration. " A little bit of machining should be done to make sure the intake-turned-exhaust works properly while keeping the top of the block durable, but that's still better than cracking engine blocks all the time. General Motors lawyers pointed to a 1988 company sketch describing the contested cooling innovation, supposedly found in an engineer's toolbox. Location: Joppa, Maryland.
He served as a regular consultant for GM engineers who visited the track to see how racers were using their creations. At the time, GM was evaluating Evans' "non-aqueous" coolant as a remedy for the LT1's steam-pocket problem. Just ahead of a scheduled hot-tunnel test, where a Corvette would be placed into a climate-controlled chamber and subject to worst-case conditions, General Motors asked Evans to demonstrate another of his solutions: reverse-flow cooling. Upon further explanation, John revealed that the Reverse Flo's 1930 Model A steering sector and components provide pretty loose steering, making handling a heart stopping challenge. In particular, coolant tended to boil around the combustion chambers, reducing the V-8's ability to extract heat from its heads. "It was counterintuitive, " he told Fortune. According to Evans, the engineers were having significant problems keeping the high-output LT1 cool underneath the Corvette's low-slung hood, and early testing of the upcoming Camaro and Firebird had shown similar problems. While the contractual argument was muddied by the casual nature of the two parties' business relationship, another critical component was General Motors' claim to have designed its own reverse-flow cooling system, pinhole steam vent included, a year prior to that 1989 hot-tunnel test. So, reverse flow heads do the exact opposite, with the inlet and exhaust ports situated on the same side of the engine. They designed the car to start by turning the key switch, then pushing a button knob. The engine pictured above is the only color photo of one I could find, and it seems to have been built as a demonstration of what reverse-flow engines can do. Traditionally, the inlet valve is situated to the left of the cylinder, with the exhaust valve found on the right. To my knowledge, nobody has ever put a reverse-flow Packard V8 in a hot rod before, but now I really want to try that someday... EssExTee last edited by EssExTee.
Reverse Flow Chevy Small Block
Also, this is used today in "hot vee" turbo engines. Using electric cooling fans reduces the engine load by not turning a mechanical fan with a drive belt. They ran the heater hose to the water pump in the same location as an older small block. To maximise the volumetric efficiency of an engine, the aim is to get as much of the exhaust fumes out of the cylinder to the exhaust manifold to make as much room as possible for the intake stroke sucking in the fresh air and fuel. Most engines out there have what is called a cross-flow head, which has the inlet and exhaust ports located on different sides of the engine block. Compression ratio before detonation, what else?? This was Evans' trade secret, but he had yet to patent it. Kinda like a 4/7 swap but WAY more involved!
If nothing else, the story is a cautionary tale for entrepreneurs and inventors. Location: Bulverde, TX. Evans had figured out that the solution involved placing a small-diameter venting hole in the cylinder head, instead of the thumb-sized vents suggested by conventional wisdom. Once things soured and his invoices were left in the dust, General Motors was holding all the chips. Additional Benefits. In addition, the ports in and out of the engine normally need to be reduced in size to squeeze in both the intake and exhaust on the same side of the engine block.
Reverse Flow Small Block Chevy Engine
Automakers were hit by a series of new limitations, including tighter emissions regulations and the challenge of unleaded fuel. Location: Tyler, Tx. Reverse-flow engines are my new obsession. So what do you get when you partner John Becker, owner and operator of Pierce Refrigeration, with innovative inventor Corliss Orville Burandt, better known as Cob? For more information, photos, video of the Reverse Flo's first drive and a chance to purchase our snappy t-shirt visit our website at Story By Linda Sewald. Awesomeaustinv I've been down this rabbit hole, and as @EssExTee and @KITT222 and a few others mentioned, its a trick used off and on throughout the years. Posts: 2, 693. heh, those carbs look like the ones on an 82 honda nighthawk 750. The Reverse Flo has a gravity fed fuel system instead of a fuel pump. "
The company was ultimately forced to cover Evans' attorney fees, but its engineers were allowed to utilize steam vents in successive generations of small-block V-8s, including today's LT-series. "We enlisted Barry Cam Company in Lester Prairie, Minnesota to build a cam with repositioned lobes that worked to alter the valve timing. " This therefore decreases the volume of air that can enter and leave the cylinders, restricting performance in comparison to a cross-flow engine. Posts: 974. ive seen a video on youtube of belive it or not, taht exact car... to steal the ive herd about that 4/7 swap... and you can actually GAIN horsepower.
I guess i can just appreciate something a little different, but with the same CHEVY engine. Evans scoffed at the offer, and GM returned months later with a counter: $150, 000, but no rights to his designs. Evans tried to include the LT1's successor, the LS-series V-8, in his claim—that engine used similar steam vents—but GM's lawyers successfully argued to exclude the LS from the suit. Last edited by 69halfton; 02-03-2008 at 02:18 AM. You'd have 3 reverse speeds, and 1 forward speed. Old Busted Hotness last edited by. This means that the gases have to enter the head and then turn on their heels when being pushed back out by the engine's exhaust stroke. Ultimately, small-diameter "steam vents" were added at the back of the cylinder heads to allow trapped air to escape. John claims he and Cob will continue to refine the Reverse Flo and enjoy the crowds of attention they get at local shows.
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