Same problem with Goth valve. Lasts less then 500 miles and stuck: Image Unavailable, Please Login Image Unavailable, Please Login Any DIY solution for it? I'm unable to send it to Goth so need to do it locally.
This is interesting, what gets stuck? Is it the shaft pivot surfaces or is it the flap in the housing or is it the vacuum can itself perhaps? I suspect a bit looser tolerance may resolve it if its mechanical interference is way I ask. Turbo cars have this set up on wastgate pipes that run for with no issues for decades.
I don't have a 355, if I did I would solve it. If I could not make it work due to some design flaw I would replace it as there are many valves like that used on various cars for exhaust bypass and all sorts of things actually. Replace it with one that works and make it fit, or machine a new one etc etc. This does not seem like a hard problem honestly. Example, wrong diameter I know but you get the point. https://www.amazon.com/Loudvalves-Activated-Exhaust-Cutout-stainless/dp/B01D3W39WM Just a thought.
I can tell you that when I got mine back from Goth after the repair it looked like he took a dremmel to the bore to increase the clearance for the butterfly. It has worked great since then. Good luck!
I annoyingly sold my Capristo bypass and fitted the Gothspeed only to have it seize. Sent it back for an update. But lost confidence in it as my friends ‘updated’ version too seized. Took it off and purchased another Capristo unit and no issues since.
Brilliant dude? Not for me. I purchased a Gothspeed valve not long after owning a perfect capristo valve which I sold because I liked the Oem configuration better. Maybe 3 months later it seized. I contacted goth and he kindly told me to send back the valve and he will fix. After being off the road for 2 months when I finally came back, not long after it had seized again!.
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I thought the issue was not bearings rather flap interference with the body. As far as bearing, in high heat like that without any oil/cooling I would use a 12L14 slip fit sleeve and not a bearing I suspect.
Well, After driving my car this weekend, found that the gothspeed valve is seized up again. I will take it out and put my original one back in. May try to see if it is repairable, but it may just end up a $1000 paperweight.
Shocking, but not surprised. A real shame this did not function as intended. I don’t know goth and he has a few supporters on here that come in to bat for him, but it looks like a 100% failure rate and there is no denying that. Waste of money and he is no where to be seen since.
Actually if he was interested then this will be relatively easy job to release upgrade kits for his valves as only sleeves need to be replaced. Problem is to find suitable material for them so that they don't get jammed from heat. But this require some research. We tried to do so with two different sleeve materials and both failed very fast.
Mine failed, was sent back and 'updated' and failed again. Capristo unit has no such issues, im back with that.
That is why i'm telling that they need to do research. Their current sleeve material is not suitable for exhaust valves.
I removed mine last night, and it was freed up. I put my OEM unit back in and disassembled the goth valve. What 2 materials did you use that failed? I also agree that the bushings are the cause of the binding. I have a good friend of mine that is a machinist and I'm sure that he could make up a set easily. I would think that bronze with impregnated graphite would be suitable but that is a question for a metal expert or engineer to consider expansion coefficients.
Stainless steel and bronze. Bronze couple of times. First time inner diameter was too narrow and valve was jammed very soon. Last time no stuck but now valve rattles especially when cold.
