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I'm wondering if the inlet tract beyond the carburetor slide or butterfly has an effect on the peak RPM of the tuned-ram at wide open throttle.I have a 2-inch standoff between the head and carb on my Matchless single, then another six inches of tube before the air cleaner. Also has a Supertrap megaphone/spark arrestor on the end of a 43 inch pipe. It has bags of mid-range torque.For an additional breather, I used a late 70s VW Rabbit/Golf power-brake check valve in line with a hose off the back of the timing chain case. For the first few strokes you can hear it expelling air till it pumps down the crankcase vacuum. It has almost entirely eliminated oil leakage between the head and barrel and greatly slowed down the oil ending up on the rear chain from the stock breather. When I did this 20 years ago, there were no reed valves available that I knew about. I did that do my Commando too with similar results.The Vincent setup reminds me of the 60s Chrysler cross-ram 413 V8. The 4bbl carburetors hung out over the opposite side valve cover. Word was they were great for trailer towing. They also made a short cross ram for the 426 drag-race car, which had cast, tuned headers.
I'm wondering if the inlet tract beyond the carburetor slide or butterfly has an effect on the peak RPM of the tuned-ram at wide open throttle.
I have a 2-inch standoff between the head and carb on my Matchless single, then another six inches of tube before the air cleaner. Also has a Supertrap megaphone/spark arrestor on the end of a 43 inch pipe. It has bags of mid-range torque.
For an additional breather, I used a late 70s VW Rabbit/Golf power-brake check valve in line with a hose off the back of the timing chain case. For the first few strokes you can hear it expelling air till it pumps down the crankcase vacuum. It has almost entirely eliminated oil leakage between the head and barrel and greatly slowed down the oil ending up on the rear chain from the stock breather. When I did this 20 years ago, there were no reed valves available that I knew about. I did that do my Commando too with similar results.
The Vincent setup reminds me of the 60s Chrysler cross-ram 413 V8. The 4bbl carburetors hung out over the opposite side valve cover. Word was they were great for trailer towing. They also made a short cross ram for the 426 drag-race car, which had cast, tuned headers.
