Vacuum Line Check Valve
 

Hi - I am changing my downpipe, so naturally I found a broken check valve...

I am sourcing replacements, and am now confused. Atkins Rotary website lists several check valves; https://www.atkinsrotary.com/store/?...=all&brandId=0

The one on my car that was broken looks to be green and black, or as Atkins calls it, "87-92 Delay Check Valve". My car is a 1994. This is the check valve between the Y-Pipe and the vacuum chamber. Is the broken geen/black check valve installed on my car the correct valve? I have found evidence that several of the hoses at my y-pipe / turbo area have been tinkered with, since the clamps are not on the original seats, and some are newer/cleaner than others. Should I replace it with a standard check valve? I wonder how they get these things to "delay"; perhaps there is a spring that only opens at a certain differential pressure? I checked the manual and this thing is identified as just a "check valve"

Thanks
Jarod
https://cimg5.ibsrv.net/gimg/www.rx7...a1e336b49b.jpg

Dale Clark sells (or used to as late as last year when I bought mine from him) Viton check valves that are good replacements and cheaper if you want to go that route.

I PM'd you on it.

The stock check valves are just one way check valves. The original check valves were green/black and green/white, I think the green/black had a filter in there. I believe Mazda was trying to keep the check valve from jamming up since they used a crappy design. They don't sell the green/black ones any more and only have the white/green which has superceded the old style.

They are crazy expensive and quite crappy, poor design and aren't made to take the heat and oil. Mazda used the EXACT same check valves since the 1st gen RX-7.

The ones I have use a floating Viton diaphragm and a high temp plastic casing. I've sold probably 2-3 THOUSAND of them over 15 years and have seen about 2 or 3 of them fail or have a problem. They will even work when filled with oil.

Dale

Thank you both, I will be in touch Dale.

Hey, I hate to bring this thread back to life, I just can't seem to pm you because of permissions issues. I need a couple of those check valves you were talking about. Could you help me source some that aren't price expensive af. Thanks

Sent you a PM, Thanks.

Dale

Hi. I am also interested in the check valves. I tried getting dale on Facebook but luck yet. Hopefully be able to get em here. Thanks

PM'd you, Thanks

Dale

Buy the ones from Dale.

Hi Dale, I am a new member with a 93 R! and would like to get a bag of check valves. Do you have other products?
Thanks, Dave

hey, I'd like to buy some as well for my 91 FC3S but can't seem to be able to PM you as well.

PM'd you.

Dale

Hey Dale, would like to buy some of those check valves as well. Would PM but don't seem to be able to.

PM'd you, Thanks

Dale

Hey dale, i was looking to get some check valves as well but cant pm you. also, do your check valves replace both the green/black and green/white? TIA

I sent you a PM, Thanks!

Dale

DaleClark Do you still sale the check valves? Couldn’t PM you.

Banzai racing sells them.

Nowayman, PM'd you

Dale