PCV Info

[wilf]

Found a useful web address to learn how PCV's work and should be used:

http://www.hastingsfilter.com/engine...tsb_94-2r.html

enjoy

Happy Wilf

[interestedparty]

Good find, Wilf. If anyone needs to know how to set up a pcv system on a Rover V8 with 4 barrel, I will be happy to supply the details and part no. The valve cost £1.79

John

[maxGD059]

Well done Wilf.
Dont like the adjectives used- (heavy sludge, expensive repairs etc etc) so best get my system sorted when I have a moment. At least the mystery has now been cleared up. By the way do you fancy going to 'Super car Sunday' at Gaydon on 14.07.02? Apparently its free & a good event for petrolheads. Will post details shortly

Cheers

Richard
(It'll only be a 5 minute job)

[Happy Jim]

John,

Yes please !

[wilf]

Richard - Gaydon sounds good. Perhaps we can travel together. Will have to check with the boss, since she is calling in all the favours I promised to be allowed to the 'states!

Happy Wilf

[interestedparty]

Here goes, this is some stuff I wrote a while back, so some repeats of the info on the website mentioned, I've included some advice about cooling with 4barrel manifolds. BTW, I have an edelbrock manifold so it has a port for the brake servo on the manifold itself, seperate to the carb which has a central PCV port(Weber 500) other equipment may need mods, -

A couple of things to watch out for on V8's with 4 barrel conversions-
PCV system. The Rover V8 requires to be POSITIVELY Crankcase Ventilated. Most of the oil related problems in a RV8 in otherwise good condition can be traced to the PCV system or lack of it.This means that the engine internals should be subjected to a mild vacuum by the sucking the air OUT of the flame trap and IN through the small vent on the opposite rocker cover. The vacuum in the air filter is NOT sufficient for this, despite a number of installations I have seen with this feature. The pipe from the flame trap should be connected, via a PCV valve, to full manifold vacuum. The brake servo should be connected to a fitting on the manifold, and the PCV hose should be connected to the big inlet in the centre of the carb base. A PCV valve MUST be used or the vacuum will be too great and the whole engine will whistle. Suitable PCV valves can be obtained from Real Steel 01895 440505, part no BYFV184, cost about £2, it fits in the neck of the flame trap. Don't ask them for the Rover V8 PCV valve, they don't know about this trick.

Second 4 barrel problem- engine overheating due to inadequate coolant level. The original SU setup has a small pipe from top of manifold to header tank. This allows the system to fill correctly. 4 barrel manifolds don't have this and there will usually be an airlock. Best way to deal with this is to put as much coolant in as will fit, then grasp the upper hose (from thermostat to top of radiator) in both hand and squeeze firmly. If you can here air moving your system isn't full. Squeeze several time and some of the air will be vented in the header tank. Top up and repeat until all the air is out.

John

[Dan]

Good tip about the coolant John,

Regarding the PCV for the rover - In my setup I have the 2 crankcases joined via a T connector which then plugs in to the PCV port on the carb. I have 2 inline flametraps between the T connector and each crankcase...

Where would you situate the Valve? Would I need 2?

Could I put the valve in the single tube between the T connector and the Carb or would you recommend I install 2 valves between the T connector and flametraps.

Dan 'Were all these nuts used before' Man
www.cobra.kitcar.btinternet.co.uk

[Paul B]

Sorry to appear stupid, but what does this PCV valve look like ?

I am running a standard 3.5 with twin SU's. I have the flame trap on one rocker cover with a short length of hose to a splitter then two hoses onto the carbs.

On the other rocker cover I have a smaller outlet and hose connected to a one way filter, I think, allowing gases out not in.

Is this correct and where is this bloomin' PCV gadget !

Thanks

[wilf]

Richard - just checked - can't make Gaydon that weekend, going to Goodwood FOS!

Wilf

[interestedparty]

Dan

I don't think you need to vent both rocker covers, the usual idea is to draw such air as is needed IN though the rocker cover on the oil filler side, through the crankcase and OUT through the other. If you revert to this more conventional system then you only need one PCV valve. I will try later to upload a picture (last attempts failed!)

John