i have a TURBO engine i am working on has anyone removed the exhaust inserts and had no problems???

 

https://www.rx7club.com/general-rotary-tech-support-11/need-help-removing-exhaust-port-sleeves-661416/

read my post there. they are easy to get out, just takes time.

 

my qusestion is is anyone out there running wihtout them in a turbo car and what are the results

 

Mazda put them there as heat shields.
Without them you may get more exhaust heat into the housing & water jacket.
I don't know if it's enough to be a problem.
My guess is, if your cooling system can handle it - no worries.

My port job was pretty mild, so I left them in.

 

I would assume that aside from being heat shields, they probably help flow, too.

 

I don't really understand why you would want to remove them...

 

I'm taking my NA ones out and putting in TII ones.... It'll save me a bit of grinding...

Edit: the screw/slide hammer method hasn't worked for me yet. Always strips the threads on the screw and never graps the roll pin. Was going to try and weld the screw to the rollpin, but I hate welding that close to the alum. I don't want to damage anything.

 

I don't recall how big the hole in the roll pin is, or what's behind it.

Is it big enough to drill through to the other side, then use that hole as a pilot to drill from the other side to the pin & drive it out?

Just a thought..
-Bill

 

How bad is it to have a hole inside the sleeve? Maybe I could weld it back up......

 

You won't hurt the aluminum in the short amount of time to put a spot weld on th eend of the roll pin. Aluminum disapates heat very quickly.

 

ok so what i originally did is i ported the exhaust really big with the insert out cuz i wanted to go a little bigger well i am hearing that my motor wont last very long if i leave them out????? now has anyone out there experimented with this????

 

Leaving the sleeves out is for high rpm Periphereal Ports and Massive bridgeports. Removing the sleeves leaves a port outlet size of a hair under 2.5". For turbo cars, you want to keep the outlet to around 2", as exists with the stock sleeves, in order to keep exhaust gas velocity high to aid in spooling the turbocharger.

 

ok well i do have t2 sleeves but when i put them in i have a gap going underneth now on the bottom so the flow would go under kinda.

 

so my port is a little lower than this one and their is a gap between the inser and the aluminum now

 

you're gonna have to trim the port sleeve now to match your porting, that sounds like a bit of an extreme port though.. that or you didn't angle the porting into the sleeve.

 

its a narly port size really big but not like p port size