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Nelson
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22 hours ago, Dwight FitzSimons said:

Oh, so it must be open versus closed breather caps.

--Dwight

 Correct. The small holes around the bottom of the breathers were silver soldered shut. Sort of odd when it could still vent around the clearance between the breather tube and the breather.

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4 hours ago, Nelson said:

 Correct. The small holes around the bottom of the breathers were silver soldered shut. Sort of odd when it could still vent around the clearance between the breather tube and the breather.

In theory I assume a PCV system would draw some (metered) air into the rocker covers through the breather caps in order to help the engine pull crankcase fumes into the intake to be burned.  But, in reality, with the loose clearances in an R3/R4 fumes might be pushed out through the breathers.

--Dwight

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