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dynamometer 001.jpg
rear view of dyno housing1226 viewsThe long knurled knob is the load control valve. It is pre-set before the beginning of the dyno pull. The two smaller black knobs control incomming water to the engine & incomming water to the dyno reservoir. Incomming water to the engine is metered at the outlet to control engine temperature. Incomming water to the dyno reservoir is adjusted to maintain a completely full reservoir during dyno pulls. This ensures that there is no change in the pre-set load amount due to a change in the water height in the reservoir.Jim Allen
dynamometer 002.jpg
rear view of dyno housing809 viewsThis knurled knob controls a valve which allows infinitely variable loads (from full open to full closed) to be applied to the engine being tested. Repeated dyno pulls tells me where any engine makes its peak HP. There is only point where this takes place; where the torque curve & the RPM curve cross one another.Jim Allen
dynamometer 004.jpg
dyno load control knob771 viewsThis knob rotates a very precisely machined stainless steel barrel type valve that is centered on the center line of the rotor contained inside. It has an o ring seal & a teflon based locking screw to prevent rotation during dyno pulls.Jim Allen
dynamometer 005.jpg
Omega model LCF load cell763 viewsThe calibrated load cell, (with a + or - 5 lbs range & a safe overload of 150%), is not fastened to the torque arm. The specially designed ball adaptor sits on the load cell's stud to prevent errors caused by any mis-alignment. The ball adaptor also has a screw thread on its top end, which allows weights to be attached, for acuuracy checks, after zero setting the load cell. Notice the mounting of the load cell base, which is adjustable up & down, to allow the torque arm to be adjusted perpendicular to the load cell axis. Jim Allen
dynamometer 006.jpg
another view of the torque arm & dyno housing875 viewsThe dyno housing is machined in two very precise interlocking pinned pieces (.0001 clearance) & is held together with 16, 6-32 stainless steel screws. No o-ring seal is used, & there is no water leakage during dyno pulls. Notice the lightening slots in the torque arm. This small amount of out of balance causes the dyno housing to rotate in the very low stick slip Rulon bearings. Those bearings are behind the black delrin end pieces & were aligned bored after the cradle was assembled.Jim Allen
dynamometer 007.jpg
front view of torque arm & load cell743 viewsThe load cell is mounted on a very rigid one piece machined base. Jim Allen
dynamometer 008.jpg
pressurized fuel supply & a very rigid engine mount846 viewsThe base of this dyno is made of I.000 in thick Blanchard ground jig plate. All parts are doweled for accurate repeat location when dis-assembling or assembling & are made of very heavy stock for rigidty. The gas tank is also shock mounted.Jim Allen
dynamometer 009.jpg
"Standco" model MT-1 digital tach892 viewsThis digital photoelectric tachometer reads 6 to 99,999 rpm. The cost is about $350.00.Jim Allen
dynamometer 011.jpg
water reservoir710 viewsThe water reservoir is designed to always be at full capacity during dyno pulls. Notice the water inlet on the cover & the overflow outlet on the side. Constant pressure is necessary during dyno pulls in order for the pre-set load setting not to change. Jim Allen
dynamometer 012.jpg
water reservoir control valve648 viewsThis valve is opened as the engines throttle is opened. This valve is necessary because the application of the full water supply at low throttle settings may pull the engine down or prevent it from piping up. Jim Allen
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