Exhaust porting oops - problem?
#1
Old [Sch|F]ool
Thread Starter
Exhaust porting oops - problem?
Examining my new exhaust ports, I noticed that I can see past the port inserts on one of the top corners. It's like the insert didn't go deep enough into the rotor housing.
Think this will cause a problem? I'm worried about the insert overheating and collapsing. I really don't want to remove the inserts.
These are GSL-SE rotor housings, and of course it's on my best one.
Think this will cause a problem? I'm worried about the insert overheating and collapsing. I really don't want to remove the inserts.
These are GSL-SE rotor housings, and of course it's on my best one.
#2
Inserts
All they are for is to quiet exhaust without restricting flow. And might fall apart if you leave them in. Dont misunderstand the next part, why would you leave them in when now they are restricting flow and might kill your motor if they fall out.
#5
Old [Sch|F]ool
Thread Starter
Plus, my headers are not large enough to cover a non-sleeved exhaust port, which is the MAIN reason why I want to leave them in. I could just open the exhaust ports even more to fix the angle problem, but I can't do anything about the header size.
#6
Actually, flow is restricted by removing them. If I really wanted to improve flow, I'd machine inserts that have a much smaller diverging angle. Paul Yaw used to just crush them in a vise and get 30% increase in exhaust port flow with stock port size. The headers he would make had "tongues" in them to fill in the dead area of the port, like MPG Port Plates if you remember those. Incidentally, doing this greatly increased noise by all accounts - Mazda made the large diverging angle in the exhaust port as a way to cut down noise.
Plus, my headers are not large enough to cover a non-sleeved exhaust port, which is the MAIN reason why I want to leave them in. I could just open the exhaust ports even more to fix the angle problem, but I can't do anything about the header size.
Plus, my headers are not large enough to cover a non-sleeved exhaust port, which is the MAIN reason why I want to leave them in. I could just open the exhaust ports even more to fix the angle problem, but I can't do anything about the header size.
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#8
Old [Sch|F]ool
Thread Starter
I pulled the offending insert out (6-32 tap and screw method: worked awesome) and WOW. I'd never want to run without inserts, the port shape looks horrible.
I reshaped the insert and slammed it back together.
I reshaped the insert and slammed it back together.
#9
spoon!
FYI, you can make small diameter inserts by crushing some thickwall (1/8th or so) stainless tube in a vice, some pounding, and welding it into a ring. Maybe too involved, and I can't say for sure what the results are like but...
#11
Sharp Claws
iTrader: (30)
you really don't want the exhaust getting under an exposed lip, it will crush the sleeve and then you are really boned. granted it's mainly an issue when running well over 300whp but even in lower horsepower n/a applications it will still eventually do the same.
Last edited by RotaryEvolution; 09-08-12 at 06:15 PM.
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