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jlwelding

Heat Shield for the BHAF

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Does it really do much good? I am just curious since I have run a BHAF for over 100,000 miles without one and have not had any indication of a problem.

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Tell you the truth after getting the measurement from ISX there is only about +2*F difference over outside temps while rolling. As for JL_Welding you did that right by backing up the the plate with nuts so the top nuts are nearly flush...

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Well, it actually changes depending on a bunch of factors. Below freezing, it is basically the same temp as ambient. As it gets warmer, you start to see a change. I think around 70F ambient I was seeing a 5-10F difference for temps on the air filter. At 90F I am thinking 10-15F difference. Now towing actually makes it spike a little, getting up to 25F difference. Not so much in the winter but at 70F ambient was where I was seeing 20-25F difference. Running a constant high EGT makes the exhaust manifold hotter and it radiates to the air filter. My temp probe was zip tied near the front/top of the BHAF.

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Thanks for the pictures. I'm playing with my BHAF install now... I don't seem to have quite as much room as you do. I think SOMETHING is needed to stabilize the filter. My problems are entirely that my experimental set up is too floppy.

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Hm. I have not had any issues with the EGTs getting very high even towing. About the most I have seen was about 1250* for brief periods and about 900* under normal towing. Maybe the turbo I have (HX35) moves enough air?

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I love your "high-tech" shield there Mike!!!!:thumb1::thumb1: Heck, if I didn't have any "handy" bungees, I would've used "duct tape"!!!!:lmao2::lmao2:On a serious note, on my Fram Boost 2 intake (rebadged AEM Brute Force) I think the only thing the heat shield does is keep the "spray" off the filter element when driving in rain or wet roads or wet snow etc.!!

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I love your "high-tech" shield there Mike!!!!:thumb1::thumb1: Heck, if I didn't have any "handy" bungees, I would've used "duct tape"!!!!:lmao2::lmao2:

It might be a Redneck setup but it works... The bungee I added to keep the filter from banging around under the hood. Washboard roads really do make it hop... :doh:

Hm. I have not had any issues with the EGTs getting very high even towing. About the most I have seen was about 1250* for brief periods and about 900* under normal towing. Maybe the turbo I have (HX35) moves enough air?

Funny you should mention that. Just for testing and fun I had a short 3-4 mile grade at 6% to climb over with the TT cruise set at 60 MPH and it would hold 1,100*F EGT's at about 32 PSI boost with the Edge Comp wide open (5x5)

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On 3/25/2011 at 10:34 AM, Mopar1973Man said:

Here is my version... post-2-138698176677_thumb.jpg post-2-138698176668_thumb.jpg post-2-138698176663_thumb.jpg

I there a pattern for this somewhere?  I can't seem to fit my BHAF into the K&N shield.  I would like to make one of these but a pattern would sure be nice.  I saw a link to one somewhere on this site but the link was not working.

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Just now, Mopar1973Man said:

Mine was made from an old Idaho road sign.

That's fun.  I'm sure it made your truck go faster.

 

I don't have good tools for aluminum.  I may do an experiment and use your template to cut up a fire-resistant trash can and put some fire proof mat on the side where the turbo is.

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1 minute ago, leety said:

I don't have good tools for aluminum.

 

Jigsaw... That's all I used.Then went to a friends house to use his brake to fold the 90* angle. Sheet metal trash can should be interesting...

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2 minutes ago, Mopar1973Man said:

 

Jigsaw... That's all I used.Then went to a friends house to use his brake to fold the 90* angle. Sheet metal trash can should be interesting...

Actually it's a plastic trash can.

https://www.amazon.com/gp/product/B007G61OJM/ref=oh_aui_detailpage_o00_s00?ie=UTF8&psc=1

 

with some heat mat applied on the turbo side.

https://www.ebay.com/itm/Heat-Shield-Mat-Belly-Fairing-Motorcycle-Insulation-for-hood-Fiberglass-Cotton/192390551180?ssPageName=STRK%3AMEBIDX%3AIT&_trksid=p2057872.m2749.l2649

 

 

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3 minutes ago, Mopar1973Man said:

You've got my attention. I'd like to see this go through and be tested with summer heat. You'll be the first with a plastic heat shield. 

Sounds like a fun thing to try for sure.

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Just on the side of cautious nature, I would keep a fire extinguisher in the truck. Keep an eye on it as the weather warms up. If it starts to deform you'll most likely call it a fail. I'm still curious if it can be done with that kind of heat on that turrbine.

 

 

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Just now, Mopar1973Man said:

Just on the side of cautious nature, I would keep a fire extinguisher in the truck. Keep an eye on it as the weather warms up. If it starts to deform you'll most likely call it a fail. I'm still curious if it can be done with that kind of heat on that turrbine.

 

 

For sure.  A fire extinguisher is a must.  How hot does the turbine housing get?  The factory air box was aplastic right?

 

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In stock form without any injectors, tuners or fuel mods I was able to measure 1,400*F EGT's towing up a 7% grade. It was just a Chey 3/4 ton pickup on the trailer. Cruise set for 60 MPH.  When I noticed the temp I backed out and dropped a gear and kicked the RPM's up and it settled at 1,200*F the rest of the way. 

 

Yeah the factory air box is plastic...

Edited by Mopar1973Man

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Just now, Mopar1973Man said:

In stock form without any injectors, tuners or fuel mods I was able to measure 1,400*F EGT's towing up a 7% grade. It was just a Chey 3/4 ton pickup on the trailer. Cruise set for 60 MPH.  When I noticed the temp I backed out and dropped a gear and kicked the RPM's up and it settled at 1,200*F the rest of the way. 

So is that measuring the temp in inside the housing or outside?  I guess what would be good to know is if the temp of the actual housing there or the air inside of it.  I have a pyrometer for tires perhaps I can measure the turbo housing when it's all nice and hot.  Not sure how high it goes I'll have to see about that.

 

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Pyrometer typically is measuring the flame temperature inside. You could use a normal outdoor thermometer and measure the temperature around the BHAF. I know ISX did this long time again and typically without a heat shield, the temp was much more than +10*F over outside temp while rolling. Bein this is old information it might be worth testing again and seeing what you get for measurements as well.

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39 minutes ago, Mopar1973Man said:

Pyrometer typically is measuring the flame temperature inside. You could use a normal outdoor thermometer and measure the temperature around the BHAF. I know ISX did this long time again and typically without a heat shield, the temp was much more than +10*F over outside temp while rolling. Bein this is old information it might be worth testing again and seeing what you get for measurements as well.

This is the one I have.  I think it goes up to 199 degrees but it doesn't say weather or not that's F or C so I sent them a inquiry to find out.

 

https://www.joesracing.com/i-21092094-joes-deluxe-racing-pyrometer.html

 

I'll look into measuring it somehow.  I like to measure stuff LOL

 

Edited by leety

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