[Spridgets] To vent or not to vent

Robert E. Shlafer pilotrob at webtv.net
Sun Mar 22 09:45:16 MST 2009


When it comes to venting the Series A, the more than merrier.

That 1/8" "orifice" tip on emissions valve cover was originally for crankcase inlet air off a carbon canister. Clip off the end and you've a 1/2" crankcase vent line for a little easier crankcase breathing overboard or  to your carb filters.

Your routing to the "emission" carbs from the timing cover flame arrestor is as it should be, however....

most 1275 blocks (except the '67 "thin flange" types) have a plate over the original crankcase mechanical fuel pump port. This is a 1" "vent", because of it's size REALLY relieves crankcase pressures IMMENSELY. Additionally, you'll get far less crankcase vapor through the flame arrestor running through the carbs and into the combustion process once this port is opened as well. Simply fabricate a fitting and attach a 1" tube/hose or whatever.

It can go overboard through a mini filter (the crankcase "breathes" both ways) or
into a proprietary catch can or one  you can make up from a windshield washer bottle, coke can, etc.

Cap'n. Bob      '60 :{)


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