1963 fi pcv

[Michael H.]

Re: 1963 fi pcv

There has not been any activity on this thread for several days, so I figure I can safely highjack it now. I chose to reply to this thread rather than starting a new thread as I have a question related to this subject.

I have a restored 63 FI unit (375). It is on a 1962 327 block. Engine is a rebuilt 870 block, hydraulic, low compression. Being a 62 I have the road draft tube (sniff tube as we used to call them back in the days). Do not have the PCV valve setup. I have been told that the vent line from the air meter to the oil fill tube can mess the FI air meter from the oil fumes. My question is this true, and if so, will it be a problem with a car that will only see 1-2k miles per year? I believe I should have more than just the road tube for engine ventilation.
Appreciate any/all advice. -Dan-

Dan,

While the system that you have will work in the opposite direction from the original design at all engine speeds/loads, I don't think it will be an issue.

The correct 63 PCV system is designed to flow crankcase air/fumes in one direction, (in from the air filter to the crankcase, then out through the PCV system to the intake manifold) and it does so most of the time. However, at higher engine RPM/loads, often the buildup of crankcase pressure is greater than what the PCV system is able to handle and the air flow begins to reverse and flow back into the air filter. That flow direction would be just exactly like the system that you currently have.

Unless your engine has an excessive amount of oil blow by, I wouldn't worry about it.

[Dan D.]

Re: 1963 fi pcv

Hi Michael,

Thanks for you response. I guess I had not thought about it being in the reverse direction, but I understand what you are saying. My engine is fresh, so there should not be much blow by. But then again, perhaps I should just get rid of the road tube and install the PCV system. There is an additional benefit in doing this - that being I will then have a sealed crankcase system which is desirable for engines that sit for extended periods of time in high humidity. Here in upstate NY the humidity lives on 98%, and never gets below 50%. -Dan-