Other Does stroke affect timing advance?

[retroicon]

I've got a 4mm 62t stroker, and want to know if I need to adjust
anything timing wise because it's a stroker... or, can I go with my
standard 3mm advance with the enhancer.

Thanks

 

[#ZERO]

Stroker engines have an increased dwell time so the pistons stay longer at TDC and the travel speeds are faster so typically they require less timing advance.

 

[Snivilous]

Stroker engines have an increased dwell time so the pistons stay longer at TDC and the travel speeds are faster so typically they require less timing advance.

The piston stays in the top portion of the cylinder longer, but I wouldn't think it stays at TDC any longer. TDC is just a specific instant, unless the piston is stopped at TDC, you won't be at TDC any longer

 

[#ZERO]

You're correct saying the pistons stays longer at upper portion of the cylinder longer on stroker engines but if you've ever used a degree wheel with a TDC dial indicator there's quite a variance which can be fairly dramatic. You actually have to rotate the engine forward and backward ten of fifteen degrees and read the depth indications more than a few times before actually locating the true TDC crank area. This variance becomes even more vivid with bigger stroked engines that use the longer rods.

 

[Snivilous]

So you're saying the tolerance of locating TDC is larger for strokers, thus "staying longer at TDC" meaning within that tolerance? That makes sense.

 

[speedysprocket]

If you're setting your timing by distance before top dead center (BTDC), you're going to have to redo the math to get the same degrees BTDC. It should be less than what it was.