“Pro” Small Engine Stand!
Just because their engines are smaller does not mean that builders of kart, snowmobile, ATV, chainsaw, PWC, motorcycle, and industrial engines have less sophisticated testing needs. This new “Pro” stand is ideal for serious dynoing of “little” engines. Whether you’re planning simple inertia wheel acceleration tests, or need the precision of a reaction cradle frame with an electronic absorption unit, this one model handles it.
An integral console (detachable) provides space for a large screen laptop, pre-punched mounting locations for our DYNOmite Data Acquisition Computer and your engine’s analog tachometer, plus an illuminated rocker switch for power control. The vibration isolated console also accepts the DYNOmite servo (or manual) load control valve and manual (or electronic) throttle mechanism.
The included engine mounting plate accepts many popular small kart, industrial, and recreational vehicle engines. It is easily re-drilled for custom patterns or to accept pillow block bearings, etc. Even an adjustable overhead “sky-hook” boom with mount (not shown) to support gravity feed fuel tanks, electrical, and exhaust attachments is an available option.
Its heavy wall metal foundation features an integral battery tray (for starting engines or powering the electronics) and two storage shelves with room for a small onboard fuel system. Leveling pads and 3-1/2” wheels make it easier for shops without a dedicated test cell to dyno anywhere (even outside).
Prefer to place the stand in a traditional engine test chamber? The console is removable from the stand for wall mounting in your dynamometer control room. It may make your setup look like a million bucks, but this professional test center does not break the bank. It’s priced at only $1,495.
What’s new in version 9.1?
Several professional features added in version 9.1 “Pro” to extend
your DYNOmite dynamometer’s testing capabilities. But the big news is support for an optional “Pro + Oscilloscope” software module. It allows DYNO-MAX 2000 to capture combustion chamber pressure (or spark data) during engine dyno test sessions.
This “Oscilloscope” Option-Pak, in conjunction with the appropriate NI Measurement and Automation Explorer compatible high-speed data acquisitions board captures samples, averages, and records high frequency data (along with min/max peaks and delta time). It conveniently stores this information right along with your other DYNO-MAX run data, providing the capability to graph cylinder pressure curves, spark scatter, etc.
To stay with the engine technology leaders, these are must have capabilities. Engineers know that the key to enhancing cylinder performance, without detonation, is finding modifications that increase average pressure, without similarly increasing peak pressure!
If you want to begin experimenting with cylinder pressure relatively inexpensively, a “starter” kit is available. It includes our precision crankshaft position encoder, a high impedance piezoelectric pressure transducer equipped sparkplug, signal amplifier module, 500,000 Hz PCI data acquisition board, and all shielded cabling. The required DYNO-MAX 2000 “Pro+” software is sold separately.
DYNO-MAX 2000 “Pro” now includes support for multi-media video & audio capture of test cell action. Display and playback is right on DYNO-MAX’s console. It works with most inexpensive Windows compatible USB (or PCI based) video cameras.
Other new features of the “Pro” version 9.1 include consecutive pull averaging of multiple runs, Smart Clipping of “snap shot” data capture, “Race Track” Automated Test Wizards, Export of Clipped Graph Data, User Formula hooks, Graph Panning, Wireless Mouse console buttons, Context Sensitive Help, “Black Box” recorder and more.
Lastly, new “Export Environment”, “Open Environment”, and “Import (Run Template)” buttons (found even in the standard version of 9.1) make updating of the Run Information (as you switch from one type engine to another) fast and easy. This new Run Template feature alone is worth upgrading for!
University of Idaho is DYNOmite!
The University of Idaho came away with the win at the 2002 SAE Clean Snowmobile Challenge in Jackson Hole, Wyoming. The University took top honors in the “Best Performance,” “Best Design,” and “Best Fuel Economy” categories, while also coming away as champions in the Hill Climb event. The University of Idaho utilized their Land & Sea Snowmobile Engine Dyno Kit as well as a Sled Track Dyno Kit to help them win the 2002 competition. Congratulations to all the students, for a job well done!
minutes of high Hp loading (see the manufactures’ curves for each
1) Roller diameter is the major power limiter for chassis dynamometers. As roll (or tire) diameter decreases, the effective contact patch shrinks. The smaller the area, the higher the shearing loads on the reaming tread contact. Worse still, small rolls apply more PSI per pound of vehicle weight. That pressure deforms the tire’s sidewalls. Combine high Hp and speed with small rolls and this deformation can overheat and destroy tire integrity!
Avoid rolls under 30% of tire diameter for high speed or Hp. Capacity improves significantly as the roll increases towards the tire’s diameter. Beyond that, expect less dramatic improvements.
2) Tire to roller friction is the next biggest factor. Street tires on steel roll can’t match the high coefficient of friction of race slicks on warm asphalt. However, by knurling the rolls with special straight groove patterns, it’s possible to greatly reduce slippage.
3) Inertial resistance provide some (or all) of the Hp load during dyno acceleration. For chassis dynos with an absorber, roll inertia should simulate about 30% to 100% of the actual vehicle’s mass (thus reducing demands on the dyno’s speed controller).
While inertia only dynos do not have an actual Hp capacity per-se, they need excess inertia to make tests last more than a few seconds! Unfortunately, inertia alone is inadequate for steady state tests, serious engine development, or troubleshooting. (Which is why you see inertia only dynos primarily at spectator “shows”)!
4) A dynamometer’s absorber handles the entire Hp load at steady state. Figure that 90% of the Engine Hp gets into the rolls. Water brakes dissipate the Hp heating water, requiring at least 5 gallons a minute for each 100 Hp. Air cooled eddy-current absorbers loose about half their capacity, as they heat up, during the first few
Contact Us
Land & Sea, Inc. PO Box 96North Salem, NH 03073(603) 329-5645
www.land-and-sea.com
sales@land-and-sea.com
DYNOmite Torque Reaction Cradle eddy current dyno.
Land & Sea introduces the DYNOmite Torque Reaction Cradle eddy current dynamometer, suitable for automotive (or industrial) diesel and spark ignition engines. This system returns accurate power data, even during acceleration testing of engines that have high internal inertia. Reaction cradles are immune to missing the inertial energy used accelerating the engine’s crank train and flywheel. Consequently, they allow coupling to heavy-duty drive lines and absorbers without requiring rotary torque transducers or mathematical inertia compensation (for acceleration sweep testing)! This is the ideal dynamometer for developing transient ECU mapping to improve throttle response.
Typical DYNOmite Torque Reaction Cradle units are equipped with either an electronically controlled air (or water) cooled eddy current absorber, or an AC absorber (for motoring applications). A full-bridge 3-mv/volt load cell is linked to the stand’s reaction cradle. Measuring torque at the engine cradle (as opposed to the absorber) eliminates parasitic loss errors due to drive line windage and bearing friction. The cradle’s unique cantilevered design also makes access, mounting, and adapting most engine, header, and bell housing combinations easy.
Complete “Pro” dynamometer systems (utilizing the DYNOmite Torque Reaction Cradle) are available also. They are matched to the new DYNOmite-Pro 28-channel Data Acquisition Computer board set. These “Pro” versions also include the rolling support stand with our Relay Control subsystem, thermostatically controlled cooling tower, on-board fuel system, etc.
