Jump to content

10 Second Ignition Spark Timing Tech

Recommended Posts

You begin the spark early - BTDC (before top dead center).

How early is based on fuel type (petrol/LPG flame propagation time) engine rpm, combustion chamber and piston design.

So we light the fuse early, the flame spreads for a while, and by the time peak cylinder pressure occurs, your crank is around 12 ATDC (after top dead center).


If peak pressure occurred any earlier than that, it would be like a sledgehammer driving the rod into the crank straight down.

By peaking after TDC, the rod acts like a lever instead of a railroad spike.




Share this post

Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now