 I welded sensor bungs on my existing headers and sent out to Martelius-Exhaust to be coated. They stated the old chrome plating, being partially chipped off, was almost impossible to remove entirely by media blasting, and suggested they make a new set now that they have a model. I agreed, and keeping in mind the supercharger, decided to step up the diameter from 1-1/2" to 1-5/8". They were made of 409 stainless, and ceramic coated inside and out. The polished aluminum lookalike coatings look nice but do virtually nothing, so these were coated with "Turbo Blue", which effectively reduces heat radiation. The flanges are laser-cut and 10 mm thick. Notice that each primary pipe has a 1/8" nipple for thermocouples, in case I wish to monitor exhaust temps. Probably not necessary until going under boost. On the # 5 & 6 primaries, there are also bungs for wideband lambda sensors. These will be used on a chassis dyno to find the injector timing that yields the best mixture balance between adjacent cylinders (sharing an intake port). There's also a third wideband sensor bung on the collector, which the ViPec ECU will use to monitor and correct air/fuel ratios realtime in various driving conditions. Martelius-Exhaust now have the tooling and a jig to make similar headers to anyone upon request, with or without sensor nipples and bungs, mild steel or 409 stainless, plain or coated. Only the exhaust pipe flanges shall be positioned right on the 2.5" collectors. Varius types of collector flanges are available, starting from the classic 3-bolt flange. These headers will fit the 320 engine until '48, when the motor mounts were moved on the side of the engine. Some people have inverted the leftside motor mount to gain access for headers or the factory '41-42 dual-exhaust manifolds. Send your request to sales(at)martelius.com |
To be continued... |
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