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ET: Engine (Twin) Fram FV237 Breather


Bill Cannon

Well Known and Active Website User
VOC Member
I've recently fitted one of these to my Egli D series twin, to the front exhaust valve cover with the large end to the engine and the small end to the outlet pipe.

Before fitting I found that blowing through it did not stop the airflow completely in either direction, is this right?

Since fitting it the bike is chucking out loads of oil instead of the relatively small amount before fitment.

The engine is all new TP top end so is not worn out?

Cheers Bill
 

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Dave61

Well Known and Active Website User
VOC Member
I've recently fitted one of these to my Egli D series twin, to the front exhaust valve cover with the large end to the engine and the small end to the outlet pipe.

Before fitting I found that blowing through it did not stop the airflow completely in either direction, is this right?

Since fitting it the bike is chucking out loads of oil instead of the relatively small amount before fitment.

The engine is all new TP top end so is not worn out?

Cheers Bill
Hi Bill,
I've got one of these to fit & thought it was small end to engine with big end to hose outlet.
Would it be possible to give it a try that way round ?
Cheers
Dave
 

Bill Cannon

Well Known and Active Website User
VOC Member
Hi Bill,
I've got one of these to fit & thought it was small end to engine with big end to hose outlet.
Would it be possible to give it a try that way round ?
Cheers
Dave
You may be right Dave it certainly seems to be sucking the oil out?
Does yours shut of completely in one direction or just restrict the flow like mine?

Cheers Bill
 

Dave61

Well Known and Active Website User
VOC Member
You may be right Dave it certainly seems to be sucking the oil out?
Does yours shut of completely in one direction or just restrict the flow like mine?

Cheers Bill
I'll try to remember to check tonight when I get in from work.
As far as I can remember they should allow flow both ways but they aren't equal if you know what I mean.
Cheers
Dave
 

Dave61

Well Known and Active Website User
VOC Member
You may be right Dave it certainly seems to be sucking the oil out?
Does yours shut of completely in one direction or just restrict the flow like mine?

Cheers Bill
Hi Bill,
Sorry didn't remember until I was going to bed last night.
There is more restriction blowing through the large side on mine, not sure if that helps.
Cheers
Dave
 

Bill Cannon

Well Known and Active Website User
VOC Member
Hi Bill,
Sorry didn't remember until I was going to bed last night.
There is more restriction blowing through the large side on mine, not sure if that helps.
Cheers
Dave
Thanks Dave, that sounds the same as mine.
I've replumbed it now and am feeding back into the oil tank. Doing some work on the clutch as well so will be a while before I can try it again.

Cheers Bill
 

Bill Cannon

Well Known and Active Website User
VOC Member
I've just had a belated reply from the Ebay supplier who has told me the large end is the engine side!
Cheers Bill
 

Dave61

Well Known and Active Website User
VOC Member
I've just had a belated reply from the Ebay supplier who has told me the large end is the engine side!
Cheers Bill
So that means you had fitted it the right way round then Bill.
If that's the case it doesn't really help.
Have you blocked the timed breather off ?
I think you need to or the PCV valve won't operate correctly.
Cheers
Dave
 

Bill Cannon

Well Known and Active Website User
VOC Member
So that means you had fitted it the right way round then Bill.
If that's the case it doesn't really help.
Have you blocked the timed breather off ?
I think you need to or the PCV valve won't operate correctly.
Cheers
Dave
I don't have a timed breather Dave as it's a D series engine.

Bill
 

tom wilson

Active Website User
VOC Member
The Fram breather valve is a positive crankcase pressure valve i.e. it needs a few lb of crankcase pressure to open, I would suggest it is the pressure in the crankcase pushing out the oil. I suspect you would be better with a zero pressure crankcase valve.
 

Bill Cannon

Well Known and Active Website User
VOC Member
The Fram breather valve is a positive crankcase pressure valve i.e. it needs a few lb of crankcase pressure to open, I would suggest it is the pressure in the crankcase pushing out the oil. I suspect you would be better with a zero pressure crankcase valve.
Any recommendations?
Cheers Bill
 

BigEd

Well Known and Active Website User
VOC Member
VOC Forum Moderator
The Fram breather valve is a positive crankcase pressure valve i.e. it needs a few lb of crankcase pressure to open, I would suggest it is the pressure in the crankcase pushing out the oil. I suspect you would be better with a zero pressure crankcase valve.
What is a zero pressure crankcase valve? It is not a term I have come across before. Is it a mechanical timed breather valve as standard on pre-"D" Vincent engines, etc.
 

tom wilson

Active Website User
VOC Member
Any recommendations?
Cheers Bill
Hi Bill I have found some smaller ones that will fit a 1/4" internal bore pipe (with a diaphragm used on a Audi A4 PCV crankcase vent), that I have fitted to a 'D' breather cap. and a large bore 1/2" ball valve check valve (it rattles a bit if you listen hard) also if you do not mind fitting a Japanese part, the breather from a Yamaha XS 650 this is a reed valve engine breather and works very well if you can find somewhere to hide it out of view. Hope this helps. cheers
 

tom wilson

Active Website User
VOC Member
What is a zero pressure crankcase valve? It is not a term I have come across before. Is it a mechanical one like the timed breather on the Vincent.
Hi Big Ed the best I could describe is a valve that opens with no or very little pressure, The Yamaha XS 650 read valve fits the bill in my mind, or the small PCV Crankcase Vent fitted to an Audi A4 or Passat as they require very little pressure to open.
 
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