Cheap Knock Off Type S Rebuild

[amiturbo]

I DID NOT WRITE THIS I TOOK IT FROM HONDA-TECH.COM





So after a few months on my ebay Greddy type-s replica if failed. The bov didn't open on low boost. So I tried a smaller spring then half spring, but no luck. So I was messing around with it and found out that the diaphragm was shot. Air was leaking causing the bov not to open when you shift gear. So I then took it apart.

Here's the diaphragm

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Cracks it had

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I went and bought some rubber repair but it didn't work... So I was thinking and thinking. The replacement one ranges from $60-$80 online. So I decided why not make my own diaphragm. I went and bought a bike inner tube and cut it to match. MAKE SURE YOU CUT IT SLIGHTLY BIGGER SO IT CAN HAVE ROOM FOR PLAY CAUSE BY THE MOVEMENT OF THE PISTON.

My replacement

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All cut up and installed

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I used a needle nose plier to hold the piston stem from moving as I took off the 8mm nut holding the assembly in place. I used a soldering iron to burn my some holes for the screws. Then reassemble and install.

Installed

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I tested it out and the diaphragm has no leaks... I'm putting the old stock single spring back in. So far it opens up and no compression surge Save me from buying a new bov. I not sure how long this will work but as long as it holds until I upgrade to a tial in the summer I'm happy.

 

[gpz750]

Interesting, but alot of work, Seems like you'd just be better off in the long run to buy a good one.

 

[amiturbo]

Ehh i've already got an egay one, i got it for $24 I figure i'll just get a couple slivers of inner tube ready for when it tears, maybe cut some out buy a few more bov's and rebuild them with that and sell them with "improved diaphragm" $40shipped

 

[kingjust]

I DID NOT WRITE THIS I TOOK IT FROM HONDA-TECH.COM





So after a few months on my ebay Greddy type-s replica if failed. The bov didn’t open on low boost. So I tried a smaller spring then half spring, but no luck. So I was messing around with it and found out that the diaphragm was shot. Air was leaking causing the bov not to open when you shift gear. So I then took it apart.

Here's the diaphragm

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Cracks it had

You must be logged in to view this image or video.

I went and bought some rubber repair but it didn’t work... So I was thinking and thinking. The replacement one ranges from $60-$80 online. So I decided why not make my own diaphragm. I went and bought a bike inner tube and cut it to match. MAKE SURE YOU CUT IT SLIGHTLY BIGGER SO IT CAN HAVE ROOM FOR PLAY CAUSE BY THE MOVEMENT OF THE PISTON.

My replacement

You must be logged in to view this image or video.

All cut up and installed

You must be logged in to view this image or video.

I used a needle nose plier to hold the piston stem from moving as I took off the 8mm nut holding the assembly in place. I used a soldering iron to burn my some holes for the screws. Then reassemble and install.

Installed

You must be logged in to view this image or video.

I tested it out and the diaphragm has no leaks... I’m putting the old stock single spring back in. So far it opens up and no compression surge Save me from buying a new bov. I not sure how long this will work but as long as it holds until I upgrade to a tial in the summer I’m happy.

Brotha, you know how funny that is... Not laughing at you but laughing because that is exactly what happened to me and exactly what I did to fix it, a bicycle inner tube. The curved shape of it was perfect for replacing the shape of the old diaphram... now it's been working for the past 1.2 years holding boost nicely with either the dual port or single port setup. But it will soon be replace with the 50mm Tial Q... yeah baby... the ebay jumpoff did it's job!

 

[amiturbo]

That's awesome. bike tubes have got to work great anyways u have to figure most people put like atleast 40psi in there bike tires!

 

[meliketoball]

Interesting, but alot of work, Seems like you'd just be better off in the long run to buy a good one.

It's like making a sandwich..

 

[amiturbo]

yea you better eat it before it eats you!

 

[JusMX141]

Instead of jacking with $2 bicycle inner tubes, go to a motorcycle shop and pick up a Heavy Duty rear tube for a motocross bike (19" rear wheel). They're about the same thickness as the stock diaphragm in the BOV, and are very durable for the $15 price tag. There's enough material in one tube to make about (20) BOV diaphragms, too.

I ran nothing but Heavy Duty tubes in my race bikes from 1998-on and NEVER had another flat during a race!

 

[knochgoon24]

^^ But why pay $15 when a $2 tube will do just fine. The reason some of us have knock offs is because we were too cheap to get a good one in the first place!

 

[amiturbo]

If I was gonna pay $15 for a tube to rebuild the bov w. i'd buy a whole new type s bov for $10 more

 

[amiturbo]

Looks like I need to buy another type s bov, and rebuild it so I can update the pics