When it's round on top, the closing is more gradual. According to that article, a rounder exhaust port gives a broader torque band while a squarer port gives more peak power. That's from the article posted.

 

But really how much of an improvemnet are we talking about? I don't know that the benifit is worth the extra effort. Do you know what the result of this is going to be? What exactly are you hoping to accomplish?

 

Better pics Dragon?????

 

I was just interested in the possibilities. I don't know exactly how much improvement is to be had. I probably won't do it on Brad's engine, but in the future, after I have ported a few engines, I will probably try it on mine, to see if there is a difference.

 

Ooops, Sorry.. I already put the engne together and will have it in the car in a few days if I can find enough time away from work...

 

Just as a follow up & a resource...



I had a difficult time finding the proper bits to do this with. Originally I used a small dremel tool (thanks wargasm) and Carbide burs that were very small. This seemed to work just fine. That is until I did it with the larger carbide 1/4 drive shanks and an air compressor. Man talk about a big difference. The work was so much easier with the proper tools.



So I was trying to locate the carbide cutters online for everyone.

You will have to run a search for"carbide burs"

 

My beast is on the road again... and she sounds really pissed with the new port... :bigok:

 

Yeah, I know to do it right, that's what I'd have to do. If I do end up doing it, it will be after I have ported, and driven several engines/cars. If I do it, and seem to notice and power difference, then I might take the time to test it via dyno. Regardless, right now it's still more of a pipe dream.

 

Well I would love to see you do it. It's a bit more than I would attempt but,I think it would be a good experiment.

If your willing that is. ...Keep posting those wild ideas of yours Danny. :bigok:

 

Indeed I will. Indeed I will.