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ARAI Dyno Test

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ARAI Engine Development Lab performed Dyno testing on a 149cc Briggs & Stratton gasoline engine as part of our research efforts.

The basic table is reproduced here. The actual report can be sent if requested but it is making the page look funny. Here is the data itself. This was a Single Cylinder, Four Stroke engine with 65mm bore and 45mm stroke Model 93412 Type 1015E 1. The test was performed on a Benz(EC-70) Dynamometer on Jan 11, 2002 with a Champion RC14YC spark plug and GTX 20W40 oil.

Engine Speed (rpm)	Torque (obs) (Nm)	Power (obs) (kW)	Air Inlet Temp. (degC)	Sp. Plug Temp. (degC)	Oil Temp. (degC)	Exhaust Temp. (degC)	BSFC (g/kWh)
Original Cylinder Head
2800	6.30	1.85	24.3	271	121.7	345	445.45
2400	5.75	1.45	24	279	135.9	356	489.42
2000	5.75	1.20	24.5	259	132.8	307	683.28
Semi-Modified Cylinder Head (one groove)
2800	6.25	1.83	29	277	116.7	370	442.94
2400	5.65	1.42	29.7	288	140.7	337	496.13
2000	5.15	1.08	30.1	282	149.4	310	533.17
Modified Cylinder Head (three grooves)
3060	5.45	1.75	24.9	262	125.8	317	400.27
2800	6.00	1.76	24.5	265	123	307	398.88
2400	6.25	1.57	24.3	267	123.5	299	413.69
2000	6.10	1.28	24.5	260	116.5	265	392.73

SEMI-MODIFIED

MODIFIED post-testing

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Comments

Erik
Written by Guest on 2007-01-29 20:37:47

Im confused by this test. the base test actually seems to be better than the single groove here. The second test with three grooves actually is a totally different cylender head with a centrally mounted spark plug and a twisted angle which would contribute to a more efficient burn with lower egt's and BSFC numbers.

School Project
Written by jfedor on 2006-10-15 17:13:02

I'm going to try modifiying Briggs and Stratton heads with my class. Can you offer any advice for not only making the grooves, but also ways to test the engine so that we retrieve accurate results?

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