harrisonl84

I fitted a forge dump valve to my 97 wrx ver 3, I made a make do bung but when i checked it when i got home I could see it was about to give way. I was wondering what bung size i need as interior measurment on the little bit of blue tubing I have is 25mm across. I have been told i would need 35mm bung but surely if it measures 25mm on the inside then I would need a 25 mm bung. Some 1 please help as cars off the road till i get 1!

jonny_693

iTrader: (5)

What are you trying to Bung? When I blocked my dump valve off I turned some 34mm Bungs and they were spot on?????

harrisonl84

where the original re circ would have gone i made a bung but it was about to pop off by the time i got home just not sure what size bung to get surely if the diameeter in the tubing i have is 25mm then something bigger like 34-35 would be better wouldnt it? this is what im not sure of

joz8968

iTrader: (13)

Whatever the recirc port hole's I.D. measures, then you need to make sure the bung's collar that fit's inside the hole is about 0.5mm/1mm bigger for a nice, snug interference fit. I'd also supplement it by clamping a jubilee clip around the ensemble.

The bung's sealing flange/cap needs to be the same diameter (or a bit bigger) as the port's O.D. i.e. the hole's + wall thickness's overall diameter.

stinger_sweaty

sorry to butt in on ur post dude, but what is the size of the hose which fits onto the dump valve itself? Reason i ask is because i pick up my version 3 sti tomoz and am fitting a bov to it.

many thanx Den.

joz8968

iTrader: (13)

Post #7 of the below thread would seem to indicate that both ports of the v.3/4 DV have an O.D. of 32mm:-

https://www.scoobynet.com/private-sa...ump-valve.html