Thoughts on exh sleeves

OK OK I change my mine. Screw the sleeves! As I said earlier I had all mine replaced due to a broken exhaust stud that was found chasing a low boost/poor performance issue. Well I solved 2 mysteries tonight, I found where the sleeve went and I found the source of the low boost.



That was the top charger, haven't got to the bottom one yet. Have 2 shiny new ones sitting here waiting to go on.

Bad thing is when you look in the exhaust outlet of that turbo the wheel looks good that's why it was reinstalled. Had to split it apart to find the damage.

 

Yeah, good question, I want to get educated on this also. I lost a turbo a year ago and i thought to believe it was age and mileage, cause when it blew, it BLEW, almost sounded like I blew a tire. So now Im wondering bout the exhaust sleeves, how can you tell when you lose one ?

 

Opps: Just reread thread and screwed up my post. It was the 5EK turbo that swallowed the sleeve, not the 2WS. Doesnt really matter, the end result is the same. Just want the story to be correct.

 

The exhaust sleeves are there to keep the exhaust heat from transfering into your cylinder head (there is a water passage there) and directs the hot gas to the turbo in a smoother fashion.

They are not needed and we put OPT warranty on a 6NZ that had old style drop over the stud gaskets that the customer supplied. Good CAT dealer should have no problem with not having the exhaust sleeves installed. You may run warmer coolant temps though as a result.

I have a cutaway picture I have to scan in and it shows exactly what they do.

 

so the exhaust sleeve increases the velocity of the exhaust gases through the runners? is this correct.
On my harley I welded in some extra ally and then reshaped the exhaust runners to increase the velocity in order to increase torque it worked great, but dam you need forearms like popeye to hold onto the thing.

 

yes and they insulate the gases to get as much heat energy as possible to spin the turbine. I remember DDS said the replacement versions of sleeves are more reliable.

 

thanks for the info, the previous info now makes perfect sense. Quite a smart addition to the head these exhaust sleeves, reducing heat transfer to the head and increasing velocity. Smart!!

So anyone that removes them as a safety concern needs to then weld in some material in order to reshape the runners to regain the velocity lost by removing the sleeves and also polish the runners and if possible have the runners ceramic coated to reduce heat transfer. or at least wrap the exhaust manifold in exhaust wrap and put a cover on the turbo to reduce heat loss, the 1st 2 feet of exhaust pipe post turbo.

 

I hope so, don't need to buy any more chargers thanks to a $13.00 sleeve.

 

Yeah!!!! one problem involves engine in other problem...