I'm not to worried about lubrication since this is only an experiment. An overhead valve (OHV) cylinder head configuration is used in today’s modern-day engines … Cylinder heads need only be a simple casting with threaded holes for the spark plugs. Although the engines changed from year to year there were basically 5 series of Oldsmobile side-valve 6 cylinder engines over the 27 years of production, 1923 to 1927, 1928 to 1931, 1932 to 1936, 1937 to 1948 and 1949 to 1950. Studebaker also produced an OHV version of its venerable 90-hp, 170-cu.in. The differences between DOHC, SOHC, and OHV or pushrod valve trains is explained. He was also the manufacturer of early speed equipment and his RAJO heads became well known to Ford and Chevy lovers. This contrasts with earlier flathead engines, where the valves were located below the combustion chamber in the engine block.. Years ago, there was some experimentation with multi valve flat heads and crossflow flatheads. The 60-70-80-90 series engines continued through the 1932 and 1933 model years. Advertisement. Buick had already pioneered efficient ohv inline 6 engines, so the Chevy Stovebolt was more of a continuation of technology rather than something new on the market. on. 66 American SW, 66 American 2dr, 82 J10, 70 Hornet, Pound, Va. Generally however it is cheaper to build a high revving OHC engine as opposed to OHV as you do not need special tapered/thick wall pushrods, special rocker shafts, exotic material valves and springs in order to cope with extreme valve spring pressures and valve inertia - if you go the exotic route on OHC engines you get the likes of 14 000RPM race engines and even 20 000RPM F1 engines. As a thought experiment, consider a sixteen cylinder, three valves per cylinder engine. I'm 100% certain that development of flathead engines would result in lawn mower engines that match the OHV versions, … The only thing I can picture is that the L-Head engine is simliar to the old flathead v8's of the 50s like the ford or the nailhead buicks of the same vintage. The babbit bearing Chevrolet six was used through to 1953 and was mated only to a 3-speed manual transmission. flathead, which used architecture dating to … I was planning to just use the stock camshaft with some long pushrods. Practical Comparison of the OHC and OHV Designs. The Ardun OHV conversion for the venerable Ford flathead was designed by Zora Arkus-Duntov and his brother Yuri as the “Ardun Engine Company of New York” in the late forties. Change to dual carbs and the vacuum is about 12 inches Hg… probably less if you’re running a cam. Enter brothers Zora and Yura Arkus-Duntov and the Ardun Mechanical Corp., New York. John Gunnell. It is always great to see historic engines or cars doing what they were supposed to do, but you can’t count out the value of having a bevy of those super-rare and insanely-beautiful artifacts of a time-gone-by in one place and available for viewing. Add to Buddy List. Sep 23, 2016 - Perfect Pistons engines & motors. What OHV Looks Like. With valves positioned in the engine block beside the piston, instead of in the cylinder head as in an OHV engine, push rods and rocker arms were not needed. Let's start with the overhead cam design. Since its cams are placed on top of the cylinders they actuate, the rotating mass of the system is lower but packaging space is increased on the top end because there has to be space for … Of course, a well developed flathead engine can run quite well, efficiently and cleanly and have a superior size/weight to power ratio. Even the Rambler American was available with a 125-hp OHV version of the flathead engine. An overhead valve (OHV) engine is a piston engine whose valves are located in the cylinder head above the combustion chamber. 1934 saw the 70 series flathead 8 replaced by the OHV Big Six, a six cylinder version of the successful 80 series engine. Retro Feel. I can't say the trip was any more difficult with the flathead than with the OHV engine, except with the trip to Utah I had to cross the Rockies. Cadillac produced a flathead V16 engine from 1938 through 1940 or ’41. Members Profile. OHV engines make more power because they have higher compression. Most flathead engines in good shape running a single carb may make 18 inches Hg at idle. This is because the space in-between cylinders is essentially wasted in an OHC engine instead of being used for a camshaft. OHV. The Nash Six name changed to "LaFayette" for the 1934/5/6 era still using the flathead six of 1925 origin. Oldsmobile produced a straight-6 automobile engine from 1923 to 1950. But then as now, in the quest for speed and power, more is never enough. The improvements were significant. Für diese Bauweise wird auch die Bezeichnung stehende Ventile verwendet, im angelsächsischen Sprachraum dominiert die Bezeichnung Flathead, worin die besonders niedrige Bauform des Zylinderkopfes zum Ausdruck kommt. OHV engines tend to be more compact than OHC engines. After WWII, flathead designs began to be superseded by OHV (overhead valve) designs. AMC Addicted Joined: May/15/2018 Location: Ontario Status: Offline Points: 2267 Post Options. AMC and its Nash predecessor were no stranger to overhead valves, however, having offered OHV engines since the 1920s. The design of the typical flathead combustion chamber limits them to 7.5:1 compression or less. It had well designed ports for a flathead and made as much power as the larger displacement OHV V16 that it superseded (431 Vs. 452 cubic inches). They also have the potential to be much lighter, since most OHC engines have several camshafts, which adds on quite a bit of weight. A new ohv Ford V8 appeared for 1954 (1955 in Canada). (And not available in Canada, this time until mid-1956). Die SV-Ventilsteuerung (Side Valves) oder Seitenventil-Anordnung bezeichnet eine Bauweise beim Viertaktmotor, bei der die Ventile seitlich neben den Zylindern angeordnet sind. I find it useful to think of engine design divided into the flathead, under-square, small bore/long stroke, high torque at low rpm, low compression/low octane era that transitioned in the 1945-'55 years to OHV, over-square, large bore/short stroke, high torque at high rpm, high compression/high octane era.