Quick Exhaust Port Question
03-18-05, 02:28 PM
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Quick Exhaust Port Question
Ok, I'm swapping engines right now. I pulled the exhaust manifold off my old engine and I noticed these little fins in the exhaust ports. I looked at my new
(used) engine and someone ground them off, it just looks like two small welds in the bottom of the ports.
My question is: Why would someone do that? Is it common to do that when the motor has been ported?
I have no knowledge of the engines history (modded, overheated, etc...)
(used) engine and someone ground them off, it just looks like two small welds in the bottom of the ports.
My question is: Why would someone do that? Is it common to do that when the motor has been ported?
I have no knowledge of the engines history (modded, overheated, etc...)
03-18-05, 02:57 PM
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Some people grind the diffusers off to eliminate the "restriction". In reality, the diffusers aren't really much of a restriction at all. Mainly, they are there to control noise. All taking them off is going to do (assuming no other porting has been done) is make the car a little lounder.
On the other hand, most people take them out when porting. It can be hard to tell if an engine is ported. Clues would be a very smooth intake/exhaust runner. If you know the size of the stock ports, you can feel the ports in question and get a good idea of what was done. But since you are asking, I can assume you have not fingered many ports.
On the other hand, most people take them out when porting. It can be hard to tell if an engine is ported. Clues would be a very smooth intake/exhaust runner. If you know the size of the stock ports, you can feel the ports in question and get a good idea of what was done. But since you are asking, I can assume you have not fingered many ports.
03-18-05, 03:09 PM
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Originally Posted by Aaron Cake
. But since you are asking, I can assume you have not fingered many ports.
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