BOV not a good Idea...

[David D]

I was running a HKS Non-recirlulating BOV on my 7mgte and it made my car run rich and back fire a lot. I just took the engine out because it was burning oil so im going to rebuild it. When I took off the head i noticed a substantial amount of carbon build up on the top of all the pistons and on the valves. could the non recirculating BOV cause this? or is it something else?

Does your car get better performance when you run a Recirculating BOV? because none of the sensored air is escaping the system and messing up the computer? How can I prevent this substantial carbon build up? (i know a little bit is normal, but this is defiantly not normal)

thanks again everyone.

 

[kamikazemkiii]

when i took my motor apart i also had carbon build up but thats normal
yes its better to recirculate the BOV
post some pics that would be best

 

[gofastgeorge]

Both an HKS EIDS, and an Apex-i Super-AFC can cure the rich syndrom caused by an open BOV.
The HKS EIDS is just for that purpose, and is it's only function.
The S-AFC has that function available on it's menu. (idle air correction)

Most likely your carbon build up is just from 100,000 miles & 17+ years worth of fosil fuel being burned,
and how many years that cylinder & ring wear, or valve stem seals have been allowing oil into the combustion process.

A BOV is for venting pressure spikes when the throttle is chopped suddenly.
Although the stock BOV was OK for stock boost & CT26,
it is not big enough for higher pressure, and volume of hot rodded 7Ms.
Output of big turbos, and/or higher boost levels is too much for that tinny valve that came on the 7M.
An aftermarket valve will dump the pressure faster, and help prevent the boost spike that can hammer a turbo.
The larger the turbo gets, the more volume of air you need to dump to keep from banging the compressor wheel around.
I have a GReddy type-R for protecting my T88-34D.
Smaller turbos can get by with smaller BOVs.