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Thread: EGR delete

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    Mechanic beeRS's Avatar

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    EGR delete

    Hi All,

    Unless I am using the search facility on here wrong, EGR has never been discussed! Its probably just me doing something silly .

    Can I just remove the EGR valve on a Duretec cylinder head, make a blanking plate from 10mm aluminium and fit it where the EGR valve used to be? Is that all there is to removing an EGR valve? Is the change in emissions an MOT concern? Any help on this would be appreciated.

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    Re: EGR delete

    yes no maybe!

    what car is your engine in? if its in an old escort then mot wise it really doesnt matter!

    if you engine is in a modern car then, yes technically removal of emission equipment would be a fail not because removing the valve would change the emissions emitted during test because it wont, but because your not allowed to remove egr valves! it would also cause a fail if removal left an engine management light on, which it should do

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    Mechanic beeRS's Avatar

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    Re: EGR delete

    Quote Originally Posted by Graham View Post
    yes no maybe!

    what car is your engine in? if its in an old escort then mot wise it really doesnt matter!

    if you engine is in a modern car then, yes technically removal of emission equipment would be a fail not because removing the valve would change the emissions emitted during test because it wont, but because your not allowed to remove egr valves! it would also cause a fail if removal left an engine management light on, which it should do
    Thanks Graham. I guess I have nothing to worry about on the MOT front. The engine's in a Cortina.

    I've done a bit more research and I think I need to block off the outlet on the induction side of the engine as well. I think the thread size is M22x1.5, so maybe just a threaded plug here would sort this. Also, there is affectively a gap in one of exhaust ports which lets exhaust gas pass to the EGR valve. Does this need welding shut?


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    Re: EGR delete

    most exhaust manifolds blank of the exhaust part

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    Re: EGR delete

    most exhaust manifolds don't block the port as the picture shows its a drilled depression.
    What you can do is block the port where the arrow is in your picture. Roger Carol sells a alloy bung to block that port.
    Or tap and thread it. Dont use stainless steel or a steal bolt as it will corrode the alloy head. you need a tinned bolt
    As with the rest of the engine do not use SS or steel bolts anywhere on alloy they will weld into the alloy.

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    Racer Decade Plus User wildo105e's Avatar

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    Re: EGR delete

    Do you not block off the inlet side with a plate ? Then that just leaves a big void running through the head going to no where ?

    https://www.ebay.co.uk/itm/FORD-DURA...-/173374595196
    Last edited by wildo105e; 31-05-2019 at 14:29.

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    Re: EGR delete

    Quote Originally Posted by _PauL_ View Post
    Dont use stainless steel or a steal bolt as it will corrode the alloy head. you need a tinned bolt
    As with the rest of the engine do not use SS or steel bolts anywhere on alloy they will weld into the alloy.
    Any different metals in contact with each other + water (wet or moisture) will cause galvanic corrosion to greater or lesser degree.
    Greased fixings / molyslip / coppaslip will help keep the water out and minimising corrosion.

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    Re: EGR delete

    Blanking where the EGR used to sit is enough in fact early Fiesta ST150’s has an ally plate where the EGR used to be and ran a different loom.
    I have just bought a steel exhaust manifold plate off eBay and I am aware that no one does any work on the void in the head under the manifold.
    The exhaust flow speed is such that perhaps a small amount of exhaust gas will sit in the void but it will not effect the gas flow.
    I will research this some more by asking racers I know but I think your over thinking the problem.

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    Mechanic beeRS's Avatar

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    Re: EGR delete

    Quote Originally Posted by _PauL_ View Post
    most exhaust manifolds don't block the port as the picture shows its a drilled depression.
    What you can do is block the port where the arrow is in your picture. Roger Carol sells a alloy bung to block that port.
    Or tap and thread it. Dont use stainless steel or a steal bolt as it will corrode the alloy head. you need a tinned bolt
    As with the rest of the engine do not use SS or steel bolts anywhere on alloy they will weld into the alloy.
    Agreed. The back face of my exhaust manifold is a flat face (as most of them are). It still leaves a void for gas to circulate round the back of the head.

    As snapper1 says, I think the simplest way to sort this is to block the EGR mounting point with an ally plate (I'll make my own, instead of using a steel one), and then putting a threaded bung with M22x1.5 thread in to the inlet side of the head. This will still leave a void inside the head for gas to linger inside, but I suspect it'll make little difference to flow. Can anyone see a problem with this idea?

    _PauL_ you got me worried now about using SS or steel bolts in the alloy now. Surely, the same problem will occur with inlet/outlet manifold studs. If we don't use steel or SS, what other options do we have for studs?

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    Re: EGR delete

    My thoughts entirely, all alloy engines use steel bolts and if you using a bolt as a bing it shouldn’t be a problem however I was planning to use the Ford alloy blanking plate with EGR metal gasket and turn up an alloy bung for the exhaust manifold EGR tract

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    Re: EGR delete

    All the stock bolts are zinc or tin coated steel(from memory I think its tin). None of them are raw steel. And yes steel will weld itself to alloy and the alloy will corrode. Use the stock bolts if you have them for intake and exhaust.
    Same goes with brass/copper radiators vs alloy blocks, its a great way to make a battery.

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    Re: EGR delete

    from the wiki
    These Metals Don't Rust But… While these metals don't rust, that does not mean that they do not corrode. They have their own forms of corrosion, such as pitting that can occur in stainless steel
    from google
    Can you bolt aluminum to Steel?
    in fact, aluminum is more resistant to general corrosion than steel. ... Use an isolating coating or paint on the aluminum and the steel to isolate them electrically. However, all of your effort will go for nothing if you just bolt the joint together. You must isolate the bolt and nut from the aluminum and steel.
    Last edited by _PauL_; 02-06-2019 at 10:23. Reason: typo

  14. #13
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    Re: EGR delete

    Getting in to another topic altogether here.
    BeeRS is only going to plug a hole permanently it won’t matter alloy or steel.
    I’m going with the alloy bung approach and will use the EGR bolts with the Ford/Mazda EGR delete plate

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    Re: EGR delete

    Quote Originally Posted by snapper1 View Post
    Getting in to another topic altogether here.
    BeeRS is only going to plug a hole permanently it won’t matter alloy or steel.
    I’m going with the alloy bung approach and will use the EGR bolts with the Ford/Mazda EGR delete plate
    50cent steel plug vs $2500 300+cfm cylinder head's water jacket.... hmm sometimes you have to sweat the little stuff.

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