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TUTORIAL, LAPPING IN EXTERNAL WASTEGATE. people, lap your valves In !!!!


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Just gone hybrid ct9 and external wastegate.

Decided to lap/seat my wastegate valve In as its just gotta help and I know for a fact on my "cheap" wastegate the valve and seat wont be MATCHED.

has helped alot and I would highly advise doing it.made a big difference

Edited by mikey4410
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I dont have any pics but the Internal valve is essentially the same as an engine valve and it has a seat that has to be air tight.

the valve seat in my wastegate is removable/repalceable. Was really easy to lapp it in and cost me £7 for paste.

well worth the 30 mins it takes to ensure that them gases aint escaping and losing you boost

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U cant do it anything other than dead centre as the valve remains In its body.

U never ever lapp a valve in by rotating it one way.it goes both ways one after the other.i think you need to watch a video on youtube on how to lapp a valve in.

thats goin to help you not ruin yours.

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U cant do it anything other than dead centre as the valve remains In its body.

U never ever lapp a valve in by rotating it one way.it goes both ways one after the other.i think you need to watch a video on youtube on how to lapp a valve in.

thats goin to help you not ruin yours.

[/quote

ha ha mike i do know how to lap valves in normal heads !! i rebuild plenty engines :)

i was curoiuse becouse the ring is on the outside not inside like on a car

the waistgate has to be bolted to a plate with the ring around the valve to keep it in place and no spring inside the cup with the cap off and put drill to the valve to seat her is that how you did it kinda ???

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  • 5 months later...

do not do the above ↑↑↑↑↑

to lap in a valve u need nothing but hand power and elbow grease. the ring need never be put in a vice as it will miss-shape it to a degree.

as I said it can all be done in situ......

Edited by mikey4410
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