New BOV question.......
Discussion
Ok...so I have one more question. I have everything hooked up correct. The BOV is at its lowest setting. When I hit the turbo hard and let up on the gas, I hear nothing. While the car is running and the hose is off the BOV nipple, there is a strong suction, and the canister valve works great....so why would the BOV not be turning on? Thanks for your help Calvin!
I guess you have a same BOV as mine, bot from PUK esprit racing. I had same problem. Here is the solution. 1st disassemble your BOV, you will see a valve with a rubber O ring. This O ring funcional nothing. Take this O ring out. If valve still not open, use sand paper rub around valve seat face angle. This will work. My english not so good, hope you understand. You can get full advice and BOV dissassemble picture from Marcus at PUK. His email is pukesprit@hotmail.com
I had the same problem with my BOV that I puchased from P.U.K. Be careful if you take it apart, there is a small ball bearing+spring in there that works as the detent on the adjuster and if your not careful you will lose it.
I took mine apart, inspected/cleaned it, reassembled and it now works fine.
Good luck with yours.
I took mine apart, inspected/cleaned it, reassembled and it now works fine.
Good luck with yours.
I am glad that many of us have similar deductive reasoning and have arrived at pretty much the same conlusions with the BOV. It is my understanding that the if the BOV sits around for a while the pressure from the spring will cause the piston to stick. Mine was like all the rest and did not work right away and was intermitant.
I too stuck a rachet handle in the opening and pressed. The only difference was that I used an ordinary weight scale to simulate 12-14 lbs of pressure and applied vac to the hose or nipple end. The piston did not move till the vac was applied and then it moved quite freely. This made it quite clear how this device works. The BOV is capable of holding a lot of pressure till vac is applied to the nipple then it can overide the spring pressure and vent.
The purpose of the O ring which many call non functional or wonder what it is for is to prevent the BOV from making a rattling noise from engine vibrations against the fuel rail. Some people in early installions years ago have installed the BOV angled near the rail and does cause an irritating noise as the T hose in between the intercooler and intake plenum is flexable.
The BOV will need to be cleaned occassionally if it should ever stick like mine had done after a few years use. All it takes is to remove the adjustment circlip, grip the top and bottom portion (I used a non slip rubber grip pad of the type used to unscrew jar tops) and counter rotated the pieces. The connection joint of the BOV pieces are concealed in the ribs and is very hard to detect where it parts. Once the cap is off the piston is just pulled out and a cleaning is a snap.
As was mention in an earlier post there is a metal ball that sits on a spring that provides the detent or click stop on full every rotation of the adjustment nipple. Be careful that the spring and ball is not lost when removing the top portion of the BOV.
Also if the nipple is pressed in while with the circlip off like in attaching the hose while the clip is off during adjustment the ball may/will slip off and you will loose the detent and hear a rattling noise when the BOV is shaken. I did this myself because I was lazy and did not put the clip back on after adjusting during runs around the neighborhood. I felt pretty stupid at that point.
It is pretty easy to correct this. With the top off and looking inside the BOV body from the top you will see a small hole off center. This is where the small spring (smaller spring than one found in a pen) goes, the metal ball just sits on top of the spring. On the top portion of the BOV on the inside you will see a small disc connected to the nipple with a notch it is this notch that provides the detent. With the spring and ball in place carefully reassemble the 2 parts without letting the ball fall off the spring, it's not too had to do just apply positive pressure while screwing the top back on.
I normally do not mention things like BOV disassembly as I did not want a bunch of people taking apart perfectly good well functioning BOV's.
We Lotus owners tend to very curious people and like to know how things work.
It's not a bad thing but I do get e-mails from time to time requesting help on how re-assemble an item. Seems a few people in the past have taken functioning items apart after a reading a disscussion I have had with another party on a repair proceedure and needed help in putting it back right. I guess inquisitive minds need to know how things works or check on what it looks like.
Looks like we have many BOV experts here and thats a good thing for all of us.
Regards,
Calvin
I too stuck a rachet handle in the opening and pressed. The only difference was that I used an ordinary weight scale to simulate 12-14 lbs of pressure and applied vac to the hose or nipple end. The piston did not move till the vac was applied and then it moved quite freely. This made it quite clear how this device works. The BOV is capable of holding a lot of pressure till vac is applied to the nipple then it can overide the spring pressure and vent.
The purpose of the O ring which many call non functional or wonder what it is for is to prevent the BOV from making a rattling noise from engine vibrations against the fuel rail. Some people in early installions years ago have installed the BOV angled near the rail and does cause an irritating noise as the T hose in between the intercooler and intake plenum is flexable.
The BOV will need to be cleaned occassionally if it should ever stick like mine had done after a few years use. All it takes is to remove the adjustment circlip, grip the top and bottom portion (I used a non slip rubber grip pad of the type used to unscrew jar tops) and counter rotated the pieces. The connection joint of the BOV pieces are concealed in the ribs and is very hard to detect where it parts. Once the cap is off the piston is just pulled out and a cleaning is a snap.
As was mention in an earlier post there is a metal ball that sits on a spring that provides the detent or click stop on full every rotation of the adjustment nipple. Be careful that the spring and ball is not lost when removing the top portion of the BOV.
Also if the nipple is pressed in while with the circlip off like in attaching the hose while the clip is off during adjustment the ball may/will slip off and you will loose the detent and hear a rattling noise when the BOV is shaken. I did this myself because I was lazy and did not put the clip back on after adjusting during runs around the neighborhood. I felt pretty stupid at that point.
It is pretty easy to correct this. With the top off and looking inside the BOV body from the top you will see a small hole off center. This is where the small spring (smaller spring than one found in a pen) goes, the metal ball just sits on top of the spring. On the top portion of the BOV on the inside you will see a small disc connected to the nipple with a notch it is this notch that provides the detent. With the spring and ball in place carefully reassemble the 2 parts without letting the ball fall off the spring, it's not too had to do just apply positive pressure while screwing the top back on.
I normally do not mention things like BOV disassembly as I did not want a bunch of people taking apart perfectly good well functioning BOV's.
We Lotus owners tend to very curious people and like to know how things work.
It's not a bad thing but I do get e-mails from time to time requesting help on how re-assemble an item. Seems a few people in the past have taken functioning items apart after a reading a disscussion I have had with another party on a repair proceedure and needed help in putting it back right. I guess inquisitive minds need to know how things works or check on what it looks like.
Looks like we have many BOV experts here and thats a good thing for all of us.
Regards,
Calvin
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