Oif frame oil vent ??? - Triumph Forum: Triumph Rat Motorcycle Forums
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post #1 of 4 (permalink) Old 11-17-2012, 01:40 PM Thread Starter
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Oif frame oil vent ???

Recently at the Vintage Bike Show at SLO, there was a display of vintage flat trackers, very nice I might add!
One had vented the oil vent at the top of the frame into the front tappet cover on the same side.
My question is will this do any harm? This would shorten up and clean up some of the hose connections going out below.
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post #2 of 4 (permalink) Old 11-17-2012, 02:50 PM
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It seems to work well enough.Triumph did it on later OIF frames,connecting the oil tank breather to a fitting at the top of the exhaust rockerbox.

The crankcase fumes from the oil tank then need to escape down the exhaust pushrod tube,through the tappet-block holes and into the crankcase,to finally escape out the crankcase breather.Eventually it goes into the same breather hose as the earlier system,running to the rear mudguard.

It looks tidier,but I don't think it works quite as well.
*Crankcase fumes returned to the oil tank are again returned to the crankcase,before they exit the breather.
*Those fumes from the oil tank (about 1/2-pint/minute at 4000 rpm),have to blow through the tappet block holes to reach the crankcase.Oil is trying to drain through those holes,and that oil lubricates the cam lobes and tappets (they will get some other oil splashed off the crank).There isn't actually a lot of oil draining from the rockerbox,about 2 teaspoons per minute or less.

None of this may matter,and it may work equally well.I don't know of any complaints or problems.
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post #3 of 4 (permalink) Old 11-17-2012, 04:37 PM
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I often wondered how much fumes the oil tank puts off. Im glad I took the time to replumb my 72 back to stock configuration at the "T" connection etc.
1/2 pint per minute is substantial.
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post #4 of 4 (permalink) Old 11-17-2012, 06:07 PM
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I use RetroRod's PCV valve breather set-up. My oil tank vent consists of a short piece of tube with a fuel filter tucked under the tank. Running for 2 summers and right through last winter. Nice and neat. No problemo.
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post #1 of 4 (permalink) Old 11-17-2012, 01:40 PM Thread Starter
Member
Grand Prix 250
Main Motorcycle: the one I'm riding
 
enuf's Avatar
 
Join Date: Dec 2011
Location: Payson, Az
Posts: 50
Other Motorcycle: 2000 Honda VFR
Extra Motorcycle: 1989 Honda Hawk GT
Oif frame oil vent ???

Recently at the Vintage Bike Show at SLO, there was a display of vintage flat trackers, very nice I might add!
One had vented the oil vent at the top of the frame into the front tappet cover on the same side.
My question is will this do any harm? This would shorten up and clean up some of the hose connections going out below.
Attached Thumbnails
Click image for larger version

Name:	PISMO OCT 12 024.jpg
Views:	171
Size:	68.3 KB
ID:	57149  
enuf is offline  
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post #2 of 4 (permalink) Old 11-17-2012, 02:50 PM
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Main Motorcycle: Rickman T120
 
Join Date: May 2010
Location: Victoria Australia
Posts: 4,721
Other Motorcycle: T160,TR6
It seems to work well enough.Triumph did it on later OIF frames,connecting the oil tank breather to a fitting at the top of the exhaust rockerbox.

The crankcase fumes from the oil tank then need to escape down the exhaust pushrod tube,through the tappet-block holes and into the crankcase,to finally escape out the crankcase breather.Eventually it goes into the same breather hose as the earlier system,running to the rear mudguard.

It looks tidier,but I don't think it works quite as well.
*Crankcase fumes returned to the oil tank are again returned to the crankcase,before they exit the breather.
*Those fumes from the oil tank (about 1/2-pint/minute at 4000 rpm),have to blow through the tappet block holes to reach the crankcase.Oil is trying to drain through those holes,and that oil lubricates the cam lobes and tappets (they will get some other oil splashed off the crank).There isn't actually a lot of oil draining from the rockerbox,about 2 teaspoons per minute or less.

None of this may matter,and it may work equally well.I don't know of any complaints or problems.
Mr.Pete is offline  
post #3 of 4 (permalink) Old 11-17-2012, 04:37 PM
Senior Member
Powerbike
Main Motorcycle: 72 tiger
 
Join Date: May 2008
Location: north idaho
Posts: 386
Other Motorcycle: 06 KLR 650
Extra Motorcycle: Guzzi 850 T
I often wondered how much fumes the oil tank puts off. Im glad I took the time to replumb my 72 back to stock configuration at the "T" connection etc.
1/2 pint per minute is substantial.
dl.allen is offline  
post #4 of 4 (permalink) Old 11-17-2012, 06:07 PM
Senior Member
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Main Motorcycle: 72 Bonneville T120RV
 
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Join Date: Aug 2010
Location: Canada
Posts: 10,195
I use RetroRod's PCV valve breather set-up. My oil tank vent consists of a short piece of tube with a fuel filter tucked under the tank. Running for 2 summers and right through last winter. Nice and neat. No problemo.
triumpt120rv is offline  
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Similar Threads
Thread Thread Starter Forum Replies Last Post
Custom David Bird Triumph Oil In Frame OIF Weld-On Motorcycle Hardtail Frame lowbrowcustoms Lowbrow Customs 1 04-09-2010 01:43 AM
2001 Legend frame V. 2002 T-Bird Frame?? jonathanrsr Hinckley Classic Triples 1 11-27-2008 09:26 AM
Rear brake vent. Vent as in mad. nunyadambusiness Speed Triple Forum 11 05-21-2008 11:12 AM
Gas cap vent retrobiker Classic, Vintage & Veteran 4 09-02-2007 08:28 PM
frame blanks for frame / swing arm on 1050 ST PeirreOBollox Sprint Forum 0 03-11-2007 08:41 AM

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