Here is a set I altered and you can see the little critical air foil I spot welded in place, (again, pop rivets will work fine, but use stainless so they do not oxidize and fall off in the heat. In the case where you have Chrome tins, pop riveting with stainless rivets is perfectly fine. If I cannot find a nice set of original German tins to use, I buy the crap for $ 2.00 at the swap meets that everyone passes, cut the foil out and weld it onto a set of aftermarket tins. But the dual port cylinder tins DO NEED this air foil. Single Port heads did not come with them and do not need this air foil. But, (here is the big difference in cooling), the aftermarket cylinder tins do not have the air foil that directs air around the crucial spark plug quench area. Again, chrome is OK, as is black or for that mater, body color. The pieces you have lacking are the cylinder tins. Jake Raby did and exhaustive research on these using flow measuring devices. Never use the center alternator mount, 930 style or the slanted style fan shrouds, they just do not work. From my experience, in a open buggy, the aftermarket fan shrouds of the dog house nature work OK, be chrome or black. Vincent, changing the air foils inside of the actual shroud may be next to worthless without some sort of flow testing technology. The primary function of the shroud and tin is to direct airflow, not radiate heat. Yeah - I have been arguing this fact for a while. I do plan to follow Joe's advice and 'transfer' these from and old OEM unit (when I get my hands on one) I do have 'regular' OEM fan shrouds but not sure the 36HP internals are interchangeable? I do realise that the main problem of the chrome fan shroud is the fact that some of the veins and air foils are missing inside these reproduction pieces. I can see how having a black fan shroud inside a sealed engine bay of a Bug or Bus would benefit from improved imissivity heat transfer but our cars' engine bay are completly exposed causing a large amount of airflow to cool the fan shroud (at speed of course). more specifically around Radiation and Convection heat loss characterictics.Īccording to the video and the "expert" in that video, color only affects the emissivity heat transfer, it does not play a role in convection (air flow) of heat transfers.īefore you tell me to go post this in the Engine/Performance section, there's a reason I'm posting this here. With this out of the way and after watching this video: Yes I know it's not as efficient as a black stock unit, Joe and I discussed it during the last ECVW trip. View original topic: Chrome fan shroud performance :: View topic - Chrome fan shroud performance Forumsįorum Index -> Performance/Engines/Transmissions -> Chrome fan shroud performance
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