Port matching?

[alucardunit1]

I notice there is not enough room to really port match in the head. has any one done this and is it really necessary.

 

[alucardunit1]

Bump?

 

[IJ.]

Ok on the intake side you lose power if you match the exhausts.

 

[radiod]

Don't quote me on this, but I'm pretty sure on the exhaust side, you want the ports to be slightly smaller than the manifold diameter so the exhaust gases can expand as they travel out of the head.

 

[IJ.]

Don't quote me on this, but I'm pretty sure on the exhaust side, you want the ports to be slightly smaller than the manifold diameter so the exhaust gases can expand as they travel out of the head.

It's so it acts as a reversion dam.

 

[spooln30]

I always port match the intake manis to the head. You can open the intake ports, you just don't want them to be super smooth so the full and air can mix better before they enter the cylinder.

 

[radiod]

It's so it acts as a reversion dam.

That would make sense. Best to keep the flow going towards the turbo than having it try and make it's way back in to the engine . For those that might be confused still, I'll lay down an IJ quote from another thread I found...

Think of it as a non return valve for the exhaust port, if the Header port is larger than the exhaust port in the head you have an effective dam.

 

[IJ.]

That would make sense. Best to keep the flow going towards the turbo than having it try and make it's way back in to the engine . For those that might be confused still, I'll lay down an IJ quote from another thread I found...

Damn I do post a lot of stuff over and over here

 

[alucardunit1]

Thanks every one for all the info