RDX cooled exhaust manifold design
07-17-2014, 03:34 PM
#1
RDX cooled exhaust manifold design
First post here at AZ, but long time 1st gen RDX owner. Itching to make our first few performance mods along with general 100k maintenance item. At any rate, I noticed that the OEM cooling circuit passes through the turbo exhaust manifold; from what I've read on the K23 RDX engine overview, this purpose of this design is to " keep the exhaust components (manifold and turbo) at the optimum temperature." Can someone comment on the benefits of passing coolant through the manifold?
My initial guess is that the exhaust manifold appears to be cast aluminum, and therefore, needs to be cooled in some method to avoid thermal damage. My other thought is to bring engine operating temp up faster with rejected heat from the exhaust.
My initial guess is that the exhaust manifold appears to be cast aluminum, and therefore, needs to be cooled in some method to avoid thermal damage. My other thought is to bring engine operating temp up faster with rejected heat from the exhaust.
07-17-2014, 03:41 PM
#2
First post here at AZ, but long time 1st gen RDX owner. Itching to make our first few performance mods along with general 100k maintenance item. At any rate, I noticed that the OEM cooling circuit passes through the turbo exhaust manifold; from what I've read on the K23 RDX engine overview, this purpose of this design is to " keep the exhaust components (manifold and turbo) at the optimum temperature." Can someone comment on the benefits of passing coolant through the manifold?
My initial guess is that the exhaust manifold appears to be cast aluminum, and therefore, needs to be cooled in some method to avoid thermal damage. My other thought is to bring engine operating temp up faster with rejected heat from the exhaust.
My initial guess is that the exhaust manifold appears to be cast aluminum, and therefore, needs to be cooled in some method to avoid thermal damage. My other thought is to bring engine operating temp up faster with rejected heat from the exhaust.
Main purpose is to maintain the optimal temp for turbo and to keep this temp down.
That's why we dont need a turbo timer )
07-22-2014, 02:40 PM
#3
think with an upgraded turbo and cams it would be beneficial to get the housing ported/extrude honed? or maybe coated in something to help it retain thermal energy? and potentially reduce under hood temps?
Last edited by TheWrench116; 07-22-2014 at 02:41 PM. Reason: content
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josiahmgillespie (03-10-2021)
07-22-2014, 09:54 PM
#6
I'm aware of some cases with cracked exhaust manifolds on RDX. They were stock. So, I'm not sure about porting.
07-23-2014, 03:16 PM
#7
http://swaintech.com/race-coatings/
Note the outcome of the parts I mentioned earlier. I confirmed with the technical support folks at SwainTech that their coatings can be top-coated, so I also used VHT Flameproof high-temp paint and high-temp clear to preserve the finish as the naturally white finish of the ceramic coating stains very easily with fluids, fingerprints, etc.
37550a3e-af60-444b-bf06-1cd9843b9dc2.jpg?t=1406146332
The following users liked this post:
josiahmgillespie (03-10-2021)
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