Keeping the exhaust and turbo cool

[SAF_Zoom]

There is two new products out used by guys that race RX-7.*Its called DEI titanium exhaust wrap and the DEI titanium turbo sheild.

 

As most guys can't seem to keep those rotary exhaust cool, you may want to research these products further.

 

You can find it here.

 

http://www.designengineering.com/index.asp

 

Here are the comments from a guys that race with the aforementioned.

 

Last but not least. DEI just released a new turbo blanket. I've seen a lot of these through the years and they were all junk to be honest. Hard to install, looked like crap, couldn't really re-use them after removing them once etc. This new product from DEI is just flat out SWEET! It is perfectly formed and sewn to fit the T3 housings. The material is actually made of Lava rock and there is an inner padding/insulation that is made of silica and has a temperature rating of 2,000 degrees F. The turbo blanket has three heavy duty metal bosses embedded in the material so you can safety wire the blanket to the turbo. The install, seriously took me 3 minutes, including twisting the SS wire with the safety wire pliers. I did the dyno pull, Trent stood in front of the car with the laser heat gun. Immediately following the pull he took a temperature reading of the turbine housing, 693 degrees F. The turbine housing, obviously at that temperature was so hot it instantly burns you. I worked on the car that hot. Right after it was installed I ran the car again, identical dyno run. Trent took another temperature reading and at the end of the pull the outside of the blanket was only 260 degrees. That's a drop of 433 degrees. After a few minutes of Trent and I talking about the results he happened to hit it again, the temp had already dropped to 130 degrees. I told him, "If that's right I should be able to touch it and not get burnt." I took the plunge, it was correct. I could lay my hand on the blanket no problem.

 

This is huge for heat control under the hood. That is a lot of heat gone from the engine bay. DEI is releasing a complete kit that will include the turbine housing blanket, a 2"x15' long roll of titanium wrap (made of the same lava material), ss wire ties for the wrap and safety wire for the blanket. This kit and the turbo blanket by itself will be available next month. Anyone interested we are going to offer both the blanket and the kit at 20% off for pre-orders. The blanket alone is $230 retail, it will be $184 for this introduction. The entire kit is $251 retail and will be $200.

 

It may be what the doctor ordered for some of you......

[Cozy Girrrl]

Unfortunately for T3 turbos. The right turbo family for our use is a T04-E

Wrapping exhaust is a no-no

...Chrissi

[Lynn Erickson]

Unfortunately for T3 turbos. The right turbo family for our use is a T04-E

Wrapping exhaust is a no-no

...Chrissi

exhaust wrap is used to keep heat off other components in an engine compartment, it also helps keep the heat in the pipe to make the headers work more efficiently. the warp does have some effect on the life of the pipe material due to the fact that the pipes get hotter because they are not in free air. most aircraft exhaust are made of type 321 stainless steel and this steel can take the heat of a warped pipe with no problem. using the warp on pipes made of type 304 stainless steel or carbon steel will shorten the life of the pipe. with air-cooled aircraft engines the cowling has a large amount of air flowing over the exhaust and in most cases does not need to be warped. but the are many where the engine is tightly cowled and the use of exhaust wrap or heat deflector must be used to avoid the heat from destroying other components.

[SAF_Zoom]

exhaust wrap is used to keep heat off other components in an engine compartment, it also helps keep the heat in the pipe to make the headers work more efficiently. the warp does have some effect on the life of the pipe material due to the fact that the pipes get hotter because they are not in free air. most aircraft exhaust are made of type 321 stainless steel and this steel can take the heat of a warped pipe with no problem. using the warp on pipes made of type 304 stainless steel or carbon steel will shorten the life of the pipe. with air-cooled aircraft engines the cowling has a large amount of air flowing over the exhaust and in most cases does not need to be warped. but the are many where the engine is tightly cowled and the use of exhaust wrap or heat deflector must be used to avoid the heat from destroying other components.

Thats was me idea... but I have no clue on the effect it could have on the turbo itself (i.e. its bearings) as pointed out by CG. Could be a win loose proposition.

 

Although I don't see why wrapping the EXHAUST only would be a problem... This would as pointed out Lynn protect the surrounding components from the radiating heat.

 

Just my 2c

[argoldman]

I've heard but have no personal knowledge that Tracy Crook uses a process where the exhaust system is coated, outside and inside which keeps the heat in the exhaust, not in the cowl. Additionally since it is also in the inside of the pipes the high heat problem might not exist.

 

The turbo is another problem.

 

One solution is to have a separate air floage cooling system for the exhaust system (isolated from most of the engine by baffeling) I used that concept on my d-fly and it worked well.

[Cozy Girrrl]

Putting the blanket on a Turbonetics ceramic ball bearing water cooled turbo should not be a problem, have the turbo and pipes hi-temp ceramic coated.

Do not put wrap on any pipes, like Lynn said it shortens the life of the pipes but more importantly it also prevents inspection.

Pipes are going to crack and break somewhere, sometime, especially with a turbo, especially with a rotary, inspect often and see it coming, wrap it up and what? wait for the surprise?

Tracy's ceramic coated pipes worked like magic, the heat goes out the pipes not into them.

...Chrissi

[SAF_Zoom]

Putting the blanket on a Turbonetics ceramic ball bearing water cooled turbo should not be a problem, have the turbo and pipes hi-temp ceramic coated.

Do not put wrap on any pipes, like Lynn said it shortens the life of the pipes but more importantly it also prevents inspection.

Pipes are going to crack and break somewhere, sometime, especially with a turbo, especially with a rotary, inspect often and see it coming, wrap it up and what? wait for the surprise?

Tracy's ceramic coated pipes worked like magic, the heat goes out the pipes not into them.

...Chrissi

Lynn mentioned that aircraft grade pipes can handle the added heat caused by them being wrapped, but the inspection thing is a good point... If Tracy's coumpound is as effecient then it could very well be the way to go. If not, then this could be an alternative for thise that continue to have heat issues (even with Tracy's coating).