Recirculating valve delete?

[Paul t4]

Who said anything about deleting egr valves?

[juanmroques]

I live out of the city of course and my car runs perfectly, no fault msgs

[skyship007]

Originally Posted by Paul t4

Who said anything about deleting egr valves?

Sorry, I meant to write Recirc valve and then drifted off topic thinking about EGR valves. Also I'm no expert on petrol engines.

Not familiar with the exact layout and function of a recirc valve in a petrol, BUT if it is part of the main crankcase vent system, IF you delete it or use an outside vent, the same regs apply in MOT terms because it is a non approved exhaust system modification.

IF the ECU adjusts to the changes involved in a delete, it won't change the actual exhaust emissions, BUT can cause problems of a local nature because the crankcase pressure could build up when booted with a worn block and that's going to cause an increase in oil and fuel consumption. In a bad case it can blow a seal or dipstick.

In the case of an outside vent Mod, the ones I remember cause oil vapour fumes when booted, it makes the car smell of burnt oil rather than burnt fuel. BUT it's still a Brown Lung cough maker of a Mod, as oil fumes are not good for the passengers or folks standing around the car wondering why it smells so bad!

If you want a real cool looking air filtration and intake system that works as the Volvo Gods intended and not as a fine sand monster, remove the entire system, take it to a real good specialist welder (MIG plus) and get a copy made in high finish aluminium alloy, or thinish steel (Crome it later). The welding for the alloy is real tricky, but can be done, although in both cases it MUST be leak tested to ensure the OEM air filter element functions.

A polished alloy one will look real cool under the blue engine bay lighting strip and a quick check of a used oil sample will reveal if it is fully functional.
That would be my idea of an awesome Mod!

[Paul t4]

Ahhhh I see. By re circulating valve, we are talking about the dump/blow off valve fitted to the turbo.
Basically all it is there for is to release excess boost pressure from the inlet tract between the turbo and throttle body when the throttle plate is snapped shut.

[skyship007]

Originally Posted by Paul t4

Ahhhh I see. By re circulating valve, we are talking about the dump/blow off valve fitted to the turbo.
Basically all it is there for is to release excess boost pressure from the inlet tract between the turbo and throttle body when the throttle plate is snapped shut.

OK, if it's the turbo dump valve, exactly the same applies, as it's oily air (Depends a bit how worn the turbo is etc) and is plumbed back to the intake, so if you delete it AND adjust the MAP the engine might be OK within the set parameters, BUT it will smell in the same way as a CCV valve delete does. Not sure if the MAP would sort itself out over time or do a permanent delete on the valves and HG by overboosting the block. Might result in a real expensive big bang when booted if you don't watch the boost pressure gauge!

I nearly got killed by a trainee pilot once who was flying a high performance twin with an old style manual waste gate turbo, as they can be over boosted (Continental only make them for race aircraft or classics now), the muppet was in coarse pitch (Too high a gear) and slammed both throttles far too far forward faster than I could get his mits off them. Both boost gauges went off the clock and the older port engine swallowed an exhaust valve in a real bad way. Aircraft engines are much lighter than car ones and it fell apart as we overshot. One piston blew out half the crankcase and we were very lucky not to have had the front two pistons and prop fall off.

The FAA traced the fault to a valve that already had a pre existing crack from a manufacturing fault that had caused a very similar failure to another Piper Seneca from Oxford. It was a bad batch and the other engines with the same exhaust valves were traced for a replacement. One expensive incident, as the engine could not be rebuilt, just binned.
The owner told me not to file a report, BUT half the bits from the old engine and all the oil finished up on the runway after we landed and it took over an hour before the Dallas cops could get the runway cleaned up and open.

[martinrpeachey]

Originally Posted by skyship007

OK, if it's the turbo dump valve, exactly the same applies, as it's oily air (Depends a bit how worn the turbo is etc) and is plumbed back to the intake, so if you delete it AND adjust the MAP the engine might be OK within the set parameters, BUT it will smell in the same way as a CCV valve delete does. Not sure if the MAP would sort itself out over time or do a permanent delete on the valves and HG by overboosting the block. Might result in a real expensive big bang when booted if you don't watch the boost pressure gauge!

You're still confusing the recirc valve with the crankcase ventilation system by the look of it mate.

The recirc simply dumps excess pressure from the charge air system out through the turbo inlet. It has nothing to do with oil vapor or the crankcase in any way.

Blanking the recirc on any ME7 petrol turbocharged engine will not generate an error in any way, it will however, lead to poor MPG due to silly driving

[Paul t4]

I think you are confusing things and yourself a bit.

The recirculating valve recirculates the "pressurised" air from the compressor housing of the turbocharger, back into the inlet piping between the inlet of the turbo and the air flow meter. So it makes no difference to where the air ends up once the throttle is closed or to the boost pressure, unless, the recirc valve has failed and is not sealing when it should be.

Also I think you are confusing the recirc valve with the turbo's wastegate in regards to the "over boosting" of the block.

[domj78]

does blanking the recirc valve throw codes on me7 p2 2.3 t5

[Jebus]

It won't do any massive amounts of harm, might chuck up the odd code, might take a few miles off the turbos life, but it makes cool noises which is part of the fun of a turbo car.

[Hsustyle]

I have bought a blanking plate but what do I do with pipes coming off the old recirc valve?
Any guides?
Ph2 v70 t5