Model T Runabout Torque and Horsepower Dyno Run! 

That's as much an indication that the first motor was sick, as much as it indicates the worth of the upgrade parts. A stock model T engine is rated at 20 HP. Old Henry's data was a bit rubbery, but getting only 13 HP shows something is wrong.

@@keithammleter3824 Henry's HP rating was from the crank not from the wheels.

@@FJB8885 ; Yes, I understand that - it is the standard way to measure engine power - but you simply don't loose that much in the gears and differential. Modern hypoid differentials have better than 90% mechanical efficiency. The Model T diff had a non-hypoid design, so its efficiency would be better - around 96%. The gearbox used planetary bevel gears so it would be around 98% efficient. If he tested in top gear, that is straight through, so better than 99% efficient. So with 13.1 HP at the wheels, the engine output at the flywheel was only 13.1 divided by 0.95 i.e., 13.9 HP. That is simply WAY too low for an engine rated at 20 hp, and simply way too low for this 2.9 litre / 177 cu in engine even with its low compression ratio and poor breathing design.

@@keithammleter3824 The plot from 1922 (apparently from 1918 data) shows 12hp/81ft-lbs/20mph @ 800rpm and 20hp/65ft-lbs/40mph @ 1600rpm. The plot also notes 3.63:1 gear ratio and 30x3.5 tires which makes me think the measurements were taken at the wheels. It also suggest this modern dyno test never spun up the engine very far.

@@mknm1349 ; Torque foot-pounds is calculated by multiplying power (in HP) by 5251 and then dividing by RPM. So, for 1600 RPM, 20 x 63025 / 1600 equals 65.6 foot-pounds - close enough to the specified 65 foot-pounds. So the specified power and torque output was at the engine flywheel as has long been standard practice for car engines. You can check this with a number of online calculators. If torque was defined to be that at the road wheels, it would be about (allowing for transmission losses) 20 x 0.9 x 5251 x 3.63 / 1600, i.e., 214 foot -pounds. Tyre diameter does not affect power or torque. The road wheels could not be turning at 1600 RPM as that would mean the car going at over 140 miles per hour. But 1600 dived by 3.63 equals 40 MPH which is what a T was capable of. It isn't clear from the video but it appears he slowly increased throttle until the dyno indicated power falling off, then slowly throttled down, which is the normal way to do it. It was probably running on only three cylinders when throttled up.

Funny. I heard the model T held the world auto speed record until the first Chevy was manufactured .

@@tomstulc9143 Nah, Chevy still has yet to beat a T in acceleration, heck they have issues with 5yr old girls on bikes

@@candle86 lol reminds me back in the time when the new pollution economy economy Chryslers of the eighties came out. Police complained they couldn't catch a fat man on a bicycle in them. It was quite a let down from the sixties and seventies huge 440 magnum New Yorkers. Ford 390 police interceptors era. Our small town had a Pontiac Bonnevile with a HO 455. My Brother bought it and it's still sitting out at our family farm. Those were the days. I had a 68 GTO HO 400. Cars were fast chrome was thick and girls had big bumpers.

Glad you enjoyed it!

Exactly what I was thinking. In my mind the heavy pistons would compare to the flywheel on old farm machinery. The HP gain was a surprise to me as well.