FH Engine Breather
- simon.holyfield
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FH Engine Breather
The plan is to replace this mangled breather pipe with something with a similar swan neck but which is long enough to drop below the frame rails.
Any pearls of wisdom before I anneal and bend the pipe? Is it better routed somewhere else?
Any pearls of wisdom before I anneal and bend the pipe? Is it better routed somewhere else?
cheers
Simes
'51 Square Four,
'58 Huntmaster,
'42 W/NG,
'30 Model A
https://ariel-square-four.blogspot.com
Simes
'51 Square Four,
'58 Huntmaster,
'42 W/NG,
'30 Model A
https://ariel-square-four.blogspot.com
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- Holder of a Silver Anorak
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Re: FH Engine Breather
A word of caution, I once extended the breather pipe with a bit of fuel tubing to exit just above ground level, to avoid previous problems of oil mist making its way onto the back tyre. This was after an engine rebuild, when the internal breather setup had been renewed with new parts.
Unfortunalely, the breather worked too well, and negative pressure when the rotating sleeve holes were closed resulted in sand and road muck being sucked into the engine, so my rebuilt engine didn't last very long!
Lesson learnt, the engine was again rebuilt, but without the extended breather. An engine with some bore wear and crankcase pressurisation would be less likely to have the same problem. I think I redirected the breather onto the rear chain (1955 frame setup).
Unfortunalely, the breather worked too well, and negative pressure when the rotating sleeve holes were closed resulted in sand and road muck being sucked into the engine, so my rebuilt engine didn't last very long!
Lesson learnt, the engine was again rebuilt, but without the extended breather. An engine with some bore wear and crankcase pressurisation would be less likely to have the same problem. I think I redirected the breather onto the rear chain (1955 frame setup).
Re: FH Engine Breather
hi
This is my breather, which I have no reason to believe is not original:
Regards Mick
This is my breather, which I have no reason to believe is not original:
Regards Mick
- simon.holyfield
- Holder of a Platinum Anorak
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- Joined: Mon Oct 17, 2011 11:16 pm
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Re: FH Engine Breather
According to the picture in the parts book, this is more or less what Ariel intended. Given that my gearbox is in the forward-most position, I can't see that this routing is very effective if indeed they intended for the router to contribute chain oiling?
I think I will route it downwards, but not too far.
I think I will route it downwards, but not too far.
cheers
Simes
'51 Square Four,
'58 Huntmaster,
'42 W/NG,
'30 Model A
https://ariel-square-four.blogspot.com
Simes
'51 Square Four,
'58 Huntmaster,
'42 W/NG,
'30 Model A
https://ariel-square-four.blogspot.com
Re: FH Engine Breather
Hi Simon
Is there enough room to direct the breather onto the inner face of the sprocket? There's no other obvious access to the inside of the FERC that I can see.
Regards Mick
Is there enough room to direct the breather onto the inner face of the sprocket? There's no other obvious access to the inside of the FERC that I can see.
Regards Mick
- simon.holyfield
- Holder of a Platinum Anorak
- Posts: 4700
- Joined: Mon Oct 17, 2011 11:16 pm
- Location: Norfolk
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Re: FH Engine Breather
Yes, with the pipe a bit longer and with some fancy bends!
cheers
Simes
'51 Square Four,
'58 Huntmaster,
'42 W/NG,
'30 Model A
https://ariel-square-four.blogspot.com
Simes
'51 Square Four,
'58 Huntmaster,
'42 W/NG,
'30 Model A
https://ariel-square-four.blogspot.com
-
- Holder of a Silver Anorak
- Posts: 648
- Joined: Fri Feb 18, 2011 10:26 am
- Location: Cardiff
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Re: FH Engine Breather
The 1954/5 inner primary cases had a cutaway to enable the breather to blow directly on the gearbox sprocket. With the introduction of the FERC and oil drip feed from the tank, the protrusion on the back of the inner chaincase (and cutaway) to shield muck being thrown off the sprocket disappeared.
- simon.holyfield
- Holder of a Platinum Anorak
- Posts: 4700
- Joined: Mon Oct 17, 2011 11:16 pm
- Location: Norfolk
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Re: FH Engine Breather
That makes sense, thanks.pete.collings wrote: ↑Tue Dec 12, 2023 11:27 pm The 1954/5 inner primary cases had a cutaway to enable the breather to blow directly on the gearbox sprocket. With the introduction of the FERC and oil drip feed from the tank, the protrusion on the back of the inner chaincase (and cutaway) to shield muck being thrown off the sprocket disappeared.
I guess they didn't change the routing of the breather pipe.
cheers
Simes
'51 Square Four,
'58 Huntmaster,
'42 W/NG,
'30 Model A
https://ariel-square-four.blogspot.com
Simes
'51 Square Four,
'58 Huntmaster,
'42 W/NG,
'30 Model A
https://ariel-square-four.blogspot.com
- simon.holyfield
- Holder of a Platinum Anorak
- Posts: 4700
- Joined: Mon Oct 17, 2011 11:16 pm
- Location: Norfolk
- Contact:
Re: FH Engine Breather
Should I expect to see much discharge from the breather?
cheers
Simes
'51 Square Four,
'58 Huntmaster,
'42 W/NG,
'30 Model A
https://ariel-square-four.blogspot.com
Simes
'51 Square Four,
'58 Huntmaster,
'42 W/NG,
'30 Model A
https://ariel-square-four.blogspot.com
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