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Parker, SD | All the factors of each engine come into play, compression ratio, how good the compression still is, cranking RPM due to starter quality/design, battery cable quality and amp loss, battery condition due to amp loss. Fuel injector quality, spray pattern quality, injection timing, injector pressure/hole count/size effecting atomization in correlation with the compression type/quality. Spray angle, fuel mixing after atomization. fuel quality.
A lot of this stuff is just due to the engine design and fuel pump style and nothing you can really do about it, a lot of old mechanical pumps had retard timing function by pushing the throttle back or pushing the shut off cable, this really aids in cold starting, Some I've seen have electronic retard solenoids, not sure if they function like a thermoachoke and pull on at key cycle and loose pull as they warm up of if there's a thermasistor somewhere controlling it. Of course computer controlled motors have it all beat as the ECM can control everything live. Multiple injector events on most motors with electronically fired injectors
The number one factor is how warm can you get the air temp inside the cylinder before injection, this is why retarded timing helps cold start, along with glow plugs, intake heaters, block heaters ect.
Edited by dodgetruck2 2/13/2025 08:31
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Engine starting differences
