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Resonant/Air Restriction/Venture Effect?

If you are thinking of buying a cold air intake, then think twice before you go out and spend your money on a aftermarket cone air filter to be fitted in the engine bay. You should also be aware of that it probably will not benefit anything, in terms of getting more cold air to the engine over the air intake you have but unfortunately often quite the opposite effect so that the engine will draw hotter air in from the engine bay, sins it is hard to eliminate the hot air in the engine bay from outside air.

I had some issues with the  heat in in the engine and actually got up to 62° - 70°c /144° - 158°f air temp. measured inside the manifold, at standstill and idling, with outside temperature at 20°c/68°f. This heat buildup is manly due to all the  tuning and modifications  I have made to the engine.

To tackle this heat buildup I had two simple choices, ether more cold air from the outside or an external oil cooler. I opted for both solutions and the results where that the core heat (mostly the heat of the oil) of the engine dropped  from 103°c to 93°c/217°f - 199°f and air temp inside the intake manifold from 62°c. to 43°c./144°f - 109°f

I bought a used air filter housing with the additional air intake spout (you can see the spout I'm talking about in the picture of the oil cooler setup "final setup") that takes air in from the wing. The hole is there on the inner side of the wing (looks like BMW anticipated a need for some more fresh air for the bigger engines) so no modifications needed.  Further more, I removed the resonant baffle that potentially could restrict fresh cold air intake and finally, I shortened and opened up the main air intake that sits in the front of the radiator. The peace I removed from the air filter housing is a silencer, that looks like it should provide some venture effect. The dilemma was, does the engine need more air at lesser velocity, or less air at faster velocity?  I opted for more air at a lower velocity although both would be the best of both worlds. Works fine for me and the MAF. After the air improvement I noticed that I had to rewrite and fine tune some of my bin. files, sins the engine is running cooler and colder more dens air is coming into the engine, hens more fuel can be added to the A/F ratio. That where  my primary thoughts behind this mod, to gain more HP without melting the engine.

The numbers speak for them self's and the problem with the rising core heat is solved.:rolleyes:



From the album:

My 523i Conversions and Maintenance

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