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Reflections on the newest PCV modification 210-2417 ed3 Posted by SWEDECAR [Email]  (#112)  [Profile/Gallery]
(more from SWEDECAR) on Thu, 16 Jun 2005 11:59:01
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I just received the newest PCV modification kit from Saab.
With a simple answer, it pretty much retract the PCV system back to one of the early modifications mentioned in SI 210-2553.
The kit contains two parts, a breather box and a PCV nipple that fits into the hose to valve cover.
For all you oldtimers that have followed and done all this different fixes through the last three years, here is some dry data.
The original breather (PCV) box had two hoses/holes side by side and one of the holes had a restriction inside.
It was approx 4mm (5/32) in diameter from factory. The first PCV mod (SI 210-2353) told us to open up that hole to 5mm (13/64) and in the new PCV box the hole is 5.5mm (7/32).
You might also remember that the SI 210-2417 asked us to enlarge that hole to 10mm (13/32) and install a two way restriction valve in that same hose a little bit further up. The intricate two way restriction valve had a hole of 3.5mm (9/64) one way and full flow (10mm) the other way.
The nipple that is inserted into the valve cover(where the vacuum hose and white check valve attached to) had a hole of about 1.8-2mm (5/64) from factory and the SI 210-2353 PCV mod said to drill it up to 2.5mm (7/64). The new nipple have the hole at approx 2.5mm.
So in all honesty. If the SI 210-2553 in 2002 didn't fix all the problems we have been seeing, I highly doubt that this latest fix will cure the "real" problem of the crank case ventilation system.
It might cure the excessive oil consumption that some people experianced after doing the SI 210-2417 fix but I can't guarantee it.
I've heard some rumors from Sweden that it might be related to this low friction engine hysteria where they have soften the piston rings (create less drag, better fuel economy) to the point where they barely seal against the cylinder walls.
With that, the engine might not create enough vacuum on the backstroke and subsequently not having a proper crank case ventilation.
It still gives good compression on the compression stroke but the rings fail going down.
By using softer piston rings it is crucial to always have a good oil film surrounding the rings to seal properly.
Don't know if this is valid or not but I have read more and more about modern cars with low friction engines loosing compression because of different reasons.
Flooding of gasolin is one reason that washes away the oil film.
Those engines comes with with almost zero compression and what you do is to take the spark plugs out, squirt oil into each cylinder and hand crank the engine over a couple of turns, install new plugs and try to start the engine.
The oil you squirted in creates enough seal/compression again to get the engine started and then the oil film is restored and the engine lives on like nothing happened as long as you found the reason why it flooded in the first place.
Anders
, Thu, 16 Jun 2005 11:59:01 <-- Viewing This Message, Thu, 16 Jun 2005 19:06:12
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