Black Box V5.1 Anleitung zur Fehlerbehebung PDF herunterladen (Seite 28)

Euro MotoElectrics, 25958 Genesee Trail Road PMB 321 Golden, Colorado USA 80401 EDL-IGN Page 28 of 43

www.EuroMotoElectrics.com info@euromotoelectrics.com Tel: 1-303-526-0901

EnDuraSpark Electronic Ignition

Installation & Troubleshooting v5.1

Fine Tuning Ignition Timing

A particular engine’s best ignition timing (either for power or fuel economy) is dependent upon

engine compression and fuel octane. (Increasing octane slows the fuel burn rate, requiring more

advanced timing.) The optimal ignition timing is also dependent on exhaust back pressure and

whether a “hot” 336” cam replaces a stock “308” camshaft.

These installation instructions use the best timing for the 1970-1990 Airheads. The 34° advance

is conservative and will work with no pinging if the correct octane gasoline is used and the

combustion chamber doesn't have higher than normal compression from carbonization. 1981 and

later Airhead models, with the lower 8.2 and 8.4 compression ratios, as well as the R50/5, should

use 32° for the maximum advance.

The EnDuraSpark electronic ignition may, of course, be set to any advance value by simply

rotating the timing wheel on the rotor bolt. If you know what you are doing you won’t need these

instructions and the ignition advance can be set to any value. Too retarded timing under heavy

load will result in higher exhaust valve and valve seat temperatures. Too advanced timing will

result in engine pinging and possible engine damage. Pinging (also known as “detonation” and

“knocking”) sounds like steel balls being shook in a jar. It is very pronounced on an Airhead.

Significant deviation from the recommended 34° ignition timing value (28°for dual plugged) will

eat up both performance and fuel economy.

To determine the absolute optional ignition timing for optimal horsepower on a specific engine, a

dynometer or Performance Box timing box is needed. This may allow a couple of degrees

advance beyond 34° to be used. A poor man’s alternative is to advance the timing until the engine

just begins to ping and then backing off (retarding) 2 degrees. Pinging is best induced under an

actual load going up a hill. Lug the engine in a high gear, at low RPM, with wide open throttle,

with a warmed up engine, using the lowest octane fuel that will ever be used. A hot humid day at

sea level is best, if possible.

If ignition timing is advanced beyond what is recommended here to increase mileage and/or

power with premium fuel, do not use lower octane fuels without returning to stock timing. The

engine could be damaged by pinging.

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Black Box V5.1 Anleitung zur Fehlerbehebung Seite 28