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Blow Off Valves

honkie

By honkie,
in New South Wales

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**RB2530** Proficient

**RB2530**

Posted
Posted
Fair enough.

I just thought that you may have tested with a compressor and pressure on both sides of the bov and seen the leak yourself instead of just taking the word of a very experienced nissan mechanic who I doubt had any part in the creation/manufacture of the Mitsubishi bov.

In the end, your bov works, is plumb back and doesn't cost much.

perhaps you could do up a DIY How To thread on what you did to use your stock bov flange to mount the BOSCH unit. and what the BOSCH unit part number is (as you said there are 2 versions), how much you paid for it and where others can purchase it from.

Mate I also used my common sense to determine that the BOV leaked. I am a mechanical engineer and know a fair bit about material science, use of alloys and methods of production, manufacturing tolerancesetc etc etc and know that the Mitsubishi manufactured BOV wont seal 100%. Two mating surfaces of equal hardness that are not lapped with relatively buggerall force pushing them together them will not seal all that well. There is not even a tapered seat (such as valves in cyl head) to help out. In fact the degree of seal will be quite variable within any given batch. Some ok, some bad.

And of course the mechanic didn't have any part in the creation of the Mitsu BOV NOR did he have any part in the creation of the RB25DET or any other engine for that matter...but he still knows a bit about them....

As far as DIY my stock induction pipework is long gone (all custom fab) but I will post some pics of how I am using the Bosch BOV currently. I will also get the Bosch part number for everyone although I am sure I am not the only member using one...

HOT_R33 Proficient

HOT_R33

Posted
Posted

I know the topic has run its course, but......

Save yourself some money and some headaches. Just go and find a GC standard GTR BOV and retain the original plumback setup.

Great flowing BOV's, fit straight on, it looks like a standard one and the cops will leave you alone for it.

Sheng Grand Master

Sheng

Posted
Posted
I know the topic has run its course, but......

Save yourself some money and some headaches. Just go and find a GC standard GTR BOV and retain the original plumback setup.

Great flowing BOV's, fit straight on, it looks like a standard one and the cops will leave you alone for it.

;)

TTT Grand Master

TTT

Posted
Posted
Run out of arguments about BOV's?

not really.

we both agree that plumback is the way.

he feels that the stock one is no good and leaks.

I disagree.

I'm not a mechanical engineer with degree in material science so don't see the need to argue this point.

I made my point from past experience and from others results.

if that's not good enough then so be it.

I do however, have a problem with Dunlop Volleys.

No ankle support.

could cause you to stall during running.

you should go barefoot immediately.

**RB2530** Proficient

**RB2530**

Posted
Posted
As far as proof that the stock BOV do work..of course they do!! I believe you. What I also believe is that with the example you give (314rwkW with stock BOV) a BOV that doesn't leak may indeed turn this into 320rwkW...

Mmmm back to it eh...Well the above quote is the point to my argument...No one would accept a 1-2mm dia hole in their induction pipework would they?

Well if you use a stock GTSt BOV this is exactly what you have...its the breather hole in the misubishi BOV...

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