Controlling blow-by Mann Provent

RDAvena · Post by **RDAvena** » Mar 20, 2006 1:41 PM

So in looking for a better solution to reducing blow-by contamination of the intake and related parts, and not wanting to use the "$29.95 Asia-Pacific special oil catch cans offered on ebay", I found the Mann Hummel Pro Vent kit:
http://www.singhmotorwerks.com/catalog/ ... cts_id=194

It is a low loss, compact design with an integrated synthetic replaceable filter and a drain at the bottom. At $143.00 it is cheaper than the $256.00 they wanted to charge me locally for the same part. It has a small enough footprint so that along with plety of hose it can basically mount anywhere in the engine compartment. Along with the included drain at the bottom you could drain that back to the oil pan or install a valve to drain it when you change your oil. Just some 411 to help with your turbo.

russc · Post by **russc** » Mar 20, 2006 2:24 PM

Do you really need that? I have not seen that on any E28, and have not heard any complaints about oil blow out from the valve cover vent or PCV?

RussC

RDAvena · Post by **RDAvena** » Mar 20, 2006 2:48 PM

really needed? No.

Will it help keep the turbo, intercooler, and intake manifold free of oil ? Yes.

You may want to read some of the older posts on Scottie's board on this topic. My recollection Todd even posted a gasoline washout of the intercooler.as a way to reduce oil ingestion. So there is proof that the crankcase ventilation does, over time, deposit an oil film on the inside of these parts.

It may not be your cup of tea, but the post was intended for those that may have a use of such a device.

Boru · Post by **Boru** » Mar 20, 2006 2:49 PM

I get plenty of blowby in the 6er... but then, I'm pretty sure it doesn't have any rings left in it.
I made (of course) a catch-can with drain that's mounted on the driver's side of the bay... pretty easy actually. It works well.

Tjn182 · Post by **Tjn182** » Mar 20, 2006 3:12 PM

russc wrote:Do you really need that? I have not seen that on any E28, and have not heard any complaints about oil blow out from the valve cover vent or PCV?

RussC

You haven't seen my intake pipes yet have you?

I get plenty of blowby in the 6er... but then, I'm pretty sure it doesn't have any rings left in it.

Hehe that's probably my problem too 8)

russc · Post by **russc** » Mar 20, 2006 4:05 PM

Well, there you go, everyone has a problem now...

Oh, looks like a fine product, go for it.

RussC

Velocewest · Post by **Velocewest** » Mar 20, 2006 5:04 PM

Well sure, it's a slick piece. But is it really better than an old coffee can half-full of cat litter?

russc · Post by **russc** » Mar 20, 2006 5:59 PM

Velocewest wrote:Well sure, it's a slick piece. But is it really better than an old coffee can half-full of cat litter?

Probably not, but when you open the hood at a meet with a coffee can in there, your can hear "thats ghetto"

RussC

papajetta · Post by **papajetta** » Mar 20, 2006 8:27 PM

if u dont have a blow by problem with a m30 your not driving it hard enough...

Monotalonawd · Post by **Monotalonawd** » Mar 20, 2006 10:55 PM

Blow-by is a lot more apparent on turbocharged cars; more pressure inside the cylinders.

On my previous car, I could see exhaust coming out from the valve cover vent hoses if I played a little with the throttle while underhood!

The easy way to avoid dirtying up the intercooler, throttle body and intake manifold with engine oil would be to just leave the vent hoses disconnected but I read somewhere that vacuum in the crankcase helps the piston rings seal better.

In that case, a catchcan "connected" to the turbo inlet would provide a steady supply of vacuum. Definetly not legal, but a cheaper way would be to run the vent hoses to the exhaust pipe, after the turbo, where it's supposed to be under vacuum all the time? Maybe someone could confirm?!

DMNaskale · Post by **DMNaskale** » Mar 20, 2006 11:10 PM

Definetly not legal, but a cheaper way would be to run the vent hoses to the exhaust pipe, after the turbo, where it's supposed to be under vacuum all the time?

It only works on drag cars and only after the mufflers, Moroso and probably others sell kits for it but it is a poor idea for a street driven car. It takes a large amount of exhaust flow and zero restriction in the pipes to be worth a damn. But there is a real benefit when it is set up properly. The exhaust pipe will never be under vacuum, but if the kit is hooked up right, a venturi is created that provides a vacuum in the vent line and pulls the crankcase gases into the exhaust.

Monotalonawd · Post by **Monotalonawd** » Mar 21, 2006 12:32 AM

Thanks for the info!

I saw a kit at Summit Racing but wondered why not many people were running it!

papajetta · Post by **papajetta** » Mar 21, 2006 6:55 AM

before it was mentioned here i was actually toying around with a set up that wouldn't need a can.
i got one of those one way valves that the gm cars use on the secondary air injection system ( inlet and outlets about 5/8 in diameter) and just tapping it onto the top of my valve cover.
this would be located behind the valve cover baffle.
and routing that towards the intake
this way i wouldn't need to be draining any oil out.

Post by **Shawn D.** » Mar 21, 2006 8:27 AM

I'd bet Russ doesn't like the idea because Dinan didn't use one!

RDAvena · Post by **RDAvena** » Mar 21, 2006 12:34 PM

Shawn D. wrote:I'd bet Russ doesn't like the idea because Dinan didn't use one!

I can epoxy the Dinan pin I recieved from the 5erFest goodie bag and resell

russc · Post by **russc** » Mar 21, 2006 2:34 PM

Shawn D. wrote:I'd bet Russ doesn't like the idea because Dinan didn't use one!

Yup, you can mess with perfection 8)

RDAvena wrote:
I can epoxy the Dinan pin I recieved from the 5erFest goodie bag and resell

People have made lots of money doing just that

RussC

Post by **Shawn D.** » Mar 21, 2006 4:08 PM

russc wrote:
Shawn D. wrote:I'd bet Russ doesn't like the idea because Dinan didn't use one!
Yup, you can mess with perfection 8)

Yes, you certainly can mess with "perfection," as you're doing by putting in an M30B35 and re-doing the engine management!

I suspect you meant to say "can't"!

So, can you or can you not mess with perfection, and if you can mess with perfection, why would you when it's perfect?

russc · Post by **russc** » Mar 21, 2006 6:24 PM

Shawn D. wrote:
russc wrote:
Shawn D. wrote:I'd bet Russ doesn't like the idea because Dinan didn't use one!
Yup, you can mess with perfection 8)
Yes, you certainly can mess with "perfection," as you're doing by putting in an M30B35 and re-doing the engine management!

I suspect you meant to say "can't"!

So, can you or can you not mess with perfection, and if you can mess with perfection, why would you when it's perfect?

Ya, "can't". Im typing to fast to be of any use today. And Im too lazy to proof my post today. Just making light converstion. I really don't care that much either way on Dinan. Just getting upidy with the group.

RussC

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Controlling blow-by Mann Provent

Controlling blow-by Mann Provent