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Our Port Flow Analyzer for flow bench testing has several features for making several measurements of cylinder head performance.  For head flow, pretty much anything that improves CFM flow improves the HP potential of the head. But after measuring CFM, there are several other measurements which can give better insight into one particular head runs well on the dyno or the track, and another head with equal or sometimes even less flow can run much stronger. These are the hard earned “black arts” of head porting which many engine builders are reluctant to share. Questions these engine builders are looking to answer include: Read the rest of this entry »

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There is nothing magic about 28″ water. Famed engine builder Smokey Yunick picked this pressure (about 1 psi) many years ago (probably in the 1960s) as what he thought was reasonable, and it stuck. It is now the industry standard.
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An engine dynamometer is used to measure the engine’s power. Dyno tests can be done different ways, but the most common method in the racing world is a sweep test. A sweep test is where you slowly (or quickly) accelerate (or decelerate) through the RPM range with the engine at full power. This must be done somewhat smoothly and slowly, taking about 5 to 10 seconds for good accuracy.

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Ford Engineer Blaine Ramey of Ramey Motorsports has been running one of the new Ford Factory Race Cobra Jets.  Recently they had to modify the front suspension to accommodate a deep sump oil pan. Read the rest of this entry »

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Our engine performance simulation program (Engine Analyzer Pro) produces what we call RPM Data like torque, HP, fuel flow, BSFC, etc at each RPM of the run.  It also produces Cycle Data which are things like cylinder temperature, cylinder pressure, piston thrust on the wall, intake valve lift, intake valve flow, etc at every 4 degrees of crankshaft rotation. (Behind the scenes the data is being calculated at something more like every .1 degrees, but we only report it at every 4 degrees.) Read the rest of this entry »

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Most drag racers running automatics talk about their torque converter’s “stall RPM”. They say things like “I’ve got a 5500 RPM stall converter” or “My converter stalls at 6700 RPM”. Then they are somewhat surprised that when they go to a significantly higher elevation the stall RPM drops. Read the rest of this entry »

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When you are dyno testing engines, you want to be sure that each time you test the same engine your dyno comes back with the same power curve. Read the rest of this entry »

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When we think something is 100%, we typically think it is the best it can be, that is perfect.  One way of rating an engine’s breathing ability is called Volumetric Efficiency. Read the rest of this entry »

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They used to call it “snake oil”, something of dubious value sold as a cure all for any medical condition. Read the rest of this entry »

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Sir Issac Newton in the 1700s developed the most important equation in all physics and dynamics, Force = Mass x AccelerationRead the rest of this entry »

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