Or you could block the bottom of the 'tee' and replace the oil filler cap with
a vent with a small air cleaner on it.
Another potential issue is the PCV valve closes at idle. In a full system, the
crankcase gasses--or anything that
exceeds the PCV's flow capacity--is vented back through the carburettor. I
sometimes wonder what happens in my engine
without the fresh air source, but have had no ill effects that I know of in
30-40K miles or so.
Here's an aftermarket kit for small blocks that doesn't use a fresh air source,
either:
http://www.lategreatchevy.com/assets/pdf/lategreat/563742.pdf
Besides less oil leaking, some think the PCV has other positive (pun intended)
effects such as better ring sealing and
cleaner oil.
Bob
On 2/4/2012 12:02 AM, Andrew Thorp wrote:
> OK I'll chuck my hat in the ring too.
>
> To qualify as crankcase 'ventilation',
> air needs to be drawn into the crankcase. Otherwise it is just a sort of
> assisted fume removal, assuming the crankcase is fully sealed. If a Healey
> engine is fitted with a PCV valve and is not provided with a filtered-air
> entry point then inevitably unfiltered air will be sucked in via the rear
> crankshaft scroll and probably also via the sundry oil leaks whenever the flow
> through the PCV valve exceeds the ring leakage. Works for reducing oil leakage
> but not ideal.
>
> One advantage of a properly ventilated crankcase is the
> reduction in oily smells from the oil leaking out. Without any air entering
> the crankcase the fumes (smell) reach a saturation point in the oil which is
> much higher (and therefore smellier) than if a decent air flow is present. If
> you can smell engine in the garage after a drive, a PCV valve will go a long
> way to fix this.
>
> If I were going to fit a PCV valve to a Healey I'd block the
> Tee on the rocker cover internally so that air is drawn in from the air
> cleaner to the rocker cover and then weld a simple oil vapour catcher inside
> the side plate cover followed by adding a 5/16 tube fitting to the side cover
> pipe which takes fumes to the manifold via the PCV valve. That way the factory
> vent tubing remains undisturbed and it all looks nice and original apart from
> the PCV tube running from the side plate to the manifold. I did this on my
> Ford and it has gone from stinking out the house after a run to no smell at
> all.
>
> Andy.
>
>
>
--
*******************************************************************
Bob Spidell San Jose, CA bspidell@comcast.net
*******************************************************************
_______________________________________________
Support Team.Net http://www.team.net/donate.html
Suggested annual donation $12.75
Archive: http://www.team.net/archive
Forums: http://www.team.net/forums
Healeys@autox.team.net
http://autox.team.net/mailman/listinfo/healeys
|