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I made a little progress on the p port today and have the runners in place though not finished welded. These are 21" long from the rotor face. They are steel but the bell mouths are aluminum made by Ed Klepeis. Eventually the bellmouths will be epoxied to the runners but for todays photo session we went with hose and clamps. They were not easy to make but if I had to make more, now that I have learned how, it would not be a difficult process.
Originally, the throttle bodies had a 2 inch o.d. where they were to butt up against the runners. The i.d. is 1.625. The sweep radius had to be 2.5 inches so that the runners would lay low across the top of the engine. A 3 inch R was way to high. The search for a sweep to fit the above proved fruitless. Ed K. did find a 1.9 o.d. aluminum sweep with a 1.61 i.d. which was close enough. However, this material was in a very soft condition and I could not clamp it securely enough to saw or part off, without distorting it beyond use. I am sure a real machinist could have figured out a way, but it whipped me.
Finally I switched to a steel 1.75 o.d. x 1.625 i.d. x 2.5R which made an excellent runner except that it did not match the throttle body or the bell mouth. Collars had to be made to match the 1.75 to 2 inches at the throttle body and 1.75 to 1.9 at the bell mouth. These were welded to the runner and I was nearly in business. At least on the throttle body end I could use 2 inch i.d. hose and clamp it together. I hoped it would work on the bell mouth but the 1.9 o.d. was too small for the hose and I could not clamp securely. As I said, they will be epoxied eventually.
The runners travel slightly downhill from the bell mouths. I did this to created clearance for the Bells over the engine. Here are a couple of photos. Next pics, hopefully, will be of the powder coated finished product which will include the plenum, fuel rail and dual air intakes (filtered or ram). Jerry
p port runner #2.jpg
p port runners #3.jpg
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