C1 PVC

[Greg G.]

Were PVC systems installed on all 61 Corvette's or was it Califonia only?

[Dennis C.]

PCV

I believe all California bound cars had to include the PCV option @ $5 and change. Other cars could have been ordered with this option if the buyer so desired.

[Dennis C.]

And, in addition...

I install this option on all my '62's, whether they need it or not. What is fun to try to figure out, on solid lifter engines with non breather oil cap, (my) common sense tells me this system would require a breather oil cap. However, the AIM is no help to my thinking. Any thoughts out there ???

[Duke W.]

Re: And, in addition...

PCV was required on all cars delivered in CA in '61 and '64, nationwide in '63. Don't know the details of the C1 PCV system, Dennis, but if manifold vacuum is used to draw crankcase vapors into the manifold, even with a valve to regulate flow, the system should have an opening somewhere else to admit fresh air.

PCV is a good idea since it is much more effective at purging blowby from the crankkcase, which will reduce oil dilution and sludging.

Duke

[Dennis C.]

As usual thanks & I agree Duke...

The C1 PCV systems did use manifold vacuum - actually not that much different than the C2 Corvettes, though a little less sophisticated. The one fun give away for the open oil cap, even on solid lifter engines, was the tag placed on PCV C1's interior rear view mirror with instruction to buyer on how to periodically wash/service the vented cap. AIM calls out this tag, but no open cap for the solid lifter engines. In any case, I like this system a lot better than a road draft tube. Dennis

[Mike E.]

Re: And, in addition...

Dennis, do you use the purple cement on the white "PVC" piping when you put it on the car? Do you paint the white PVC black so that it escapes judging scrutiny? Just wondering! Mike Ernst

[Dennis C.]

Cannot believe you are trying to incite a riot... *NM*

[Duke W.]

Re: And, in addition...

Wasn't there a TSB that recommended replacing the breather cap with a closed cap to eliminate oil misting in the enginen compartment?

For sure this would not work well on engines with the mandatory CA PCV option. Did they forget to call out this exception?

Oil misting would probably have been less of a problem on PCV equipped engines being as how under all operating conditions, even WOT, the flow through the vented cap should be "in" only unless the engine has excessive blowby.

Duke

[Dennis C.]

Duke, I believe that issue...

...relates back to the 56/57/58/? (road draft tube) era prior to PCV availability.