Start collision detection of particles after certain time

Hey everyone,

I've ran into a bit of a problem while making a flamethower for my game. I have collisions enabled for the flame particles, but the particles are colliding with the nozzle of the flamethrower when they're created.

So one solution would be to spawn the particles farther away from the nozzle, but then there appears to be a gap between the nozzle and the flames, which, quite frankly, doesn't look good at all. Since, you cannot tell the particle system to ignore ceratain colliders (that's how I solved the problem with my other weapons using Physics.IgnoreCollision()) the only way to fix this would be for the particles to start detecting collisions after a certain time when I'm sure that the particles are far enough away from the nozzle to not collide with it.

So far I haven't found anything on google, so I hope someone can help me on here :)

Thanks in advance!