Spark Curve Comparison

Spark Curve comparison. Larger enginees can generally take more advance. But different head designs are th number 1 reason for different curves. NOTE: If your distributor is on the low side of the tolerance it can be 4 degrees retarded and still be in specification!

Overview

A12 advance Tolerance - why using stock timing setting is not enough

http://i297.photobucket.com/albums/mm219/ddgonzal/Datsun%201200/engine/E-Series/Distributor/curve_tolerance.jpg

A12 Total advance Comparo

http://i297.photobucket.com/albums/mm219/ddgonzal/Datsun%201200/engine/E-Series/Distributor/curve_comparo_Total_range.jpg

A12 Total advance Comparo - (blueprinted)

http://i297.photobucket.com/albums/mm219/ddgonzal/Datsun%201200/engine/E-Series/Distributor/curve_comparo_A12_Total.jpg

Stock A12 curves - blueprinted to high side of tolerance

http://i297.photobucket.com/albums/mm219/ddgonzal/Datsun%201200/engine/E-Series/Distributor/curve_comparo_A12.jpg

Non-emission Type

Album 24016

A12 EXHAUST SPEC D412-63 22100-H1901

http://i297.photobucket.com/albums/mm219/ddgonzal/Datsun%201200/engine/E-Series/Distributor/curve_22100-H1901.jpg

1973 USA Manual Transmission D412-80

Album 24013

1973 USA Auto Transmission D412-89

Album 24014

Other Datsun Engines

L-series comparison

http://i297.photobucket.com/albums/mm219/ddgonzal/Datsun%201200/engine/E-Series/Distributor/curve_comparo.jpg

P engine OHV L6 4.0-liter D608-03 22100-46500 (Patrol)

http://i297.photobucket.com/albums/mm219/ddgonzal/Datsun%201200/engine/E-Series/Distributor/curve_22100-46500.jpg

R16 OHV D417-57 22100-14700, D417-57K 22100-14705

http://i297.photobucket.com/albums/mm219/ddgonzal/Datsun%201200/engine/E-Series/Distributor/curve_22100-14700.jpg

R16 OHV D407-51 22100-14600, D407-51K 22100-14606

http://i297.photobucket.com/albums/mm219/ddgonzal/Datsun%201200/engine/E-Series/Distributor/curve_22100-14600.jpg

U20 OHC D407-52 22100-25000, D407-52K 22100-25506

http://i297.photobucket.com/albums/mm219/ddgonzal/Datsun%201200/engine/E-Series/Distributor/curve_22100-25500.jpg

L16 OHC D412-64 22100-A5502

http://i297.photobucket.com/albums/mm219/ddgonzal/Datsun%201200/engine/E-Series/Distributor/curve_22100-A5502.jpg

R16 OHV D417-61 22100-A7701

http://i297.photobucket.com/albums/mm219/ddgonzal/Datsun%201200/engine/E-Series/Distributor/curve_22100-A7701.jpg

L24 22100-E4601 D612-52

http://i297.photobucket.com/albums/mm219/ddgonzal/Datsun%201200/engine/E-Series/Distributor/curve_22100-E4601.jpg

L24 22100-E8000 D614-52 2800 RPM

http://i297.photobucket.com/albums/mm219/ddgonzal/Datsun%201200/engine/E-Series/Distributor/curve_22100-E8000.jpg 

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