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BugsandJeeps
Samba Member
Joined: June 14, 2006
Posts: 121
Location: Paradise, Newfoundland
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 Posted: Mon Apr 15, 2024 10:49 am Post subject: Oil Leak under load/at speed |
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Hi All,
1914 built last fall and run in on test stand. Had leak from oil cooler during break in so fixed that and tested it again. No leaks on test stand and runs really well. Installed in car and take it for a run. See smoke behind me and stop the car. Oil is leaking from the pulley and onto the exhaust. Clean it up and look for a leak while running on jackstands. Nothing. Go for another run and leaking. Is it possible that this is excess crankcase pressure causing the oil to leak? I had a 1776 previously that I had to vent the valve covers to an oil breather box. Should I try the same here? |
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Nitramrebrab72
Samba Member
Joined: November 10, 2018
Posts: 495
Location: France
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| Posted: Mon Apr 15, 2024 11:10 am Post subject: Re: Oil Leak under load/at speed |
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| Piston rings might not be dug in properly yet if it's a new build what type of oil did you use to run it in?. Larger pistons and higher rpm's than stock might create quite a bit more back pressure and volume . Have you tried running it with the filler cap off keep an eye that it doesn't sputter oil out. |
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BugsandJeeps
Samba Member
Joined: June 14, 2006
Posts: 121
Location: Paradise, Newfoundland
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| Posted: Mon Apr 15, 2024 11:23 am Post subject: Re: Oil Leak under load/at speed |
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| 10 w 30 and no i have not run it without the filler cap. Will clean it up and try that. |
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VeloMikey
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Joined: March 19, 2012
Posts: 656
Location: So Cal
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jeffrey8164 
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Joined: January 06, 2018
Posts: 3824
Location: Georgia
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| Posted: Mon Apr 15, 2024 4:12 pm Post subject: Re: Oil Leak under load/at speed |
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Definitely crank case pressure.
In theory there shouldn’t be any but there always is.
I had the same issue on my 1915 and put a breather on it from the valve covers and the oil filler. Still had a little.
Went to a 2276 and added a fourth vent from the mechanical fuel pump location and added a sand seal pulley and I have none at this point. Fingers crossed.
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Turning owners into mechanics since 1938.
“Let he that is without oil throw the first rod”
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oprn
Samba Member
Joined: November 13, 2016
Posts: 12767
Location: Western Canada
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| Posted: Tue Apr 16, 2024 5:23 am Post subject: Re: Oil Leak under load/at speed |
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Show us a picture of your present crankcase vent system.
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richparker
Samba Member
Joined: November 24, 2011
Posts: 6989
Location: Durango, CO
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| Posted: Tue Apr 16, 2024 5:44 am Post subject: Re: Oil Leak under load/at speed |
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I had oil coming from the pully on my current 2275 after it was built. At the time I use a OG stock pulley with a new CB White Rhino case. I changed the pulley, to CB Equalizer and the leak stopped. I’m guessing old vs new was not meshing well.
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volky1970
Samba Member
Joined: November 11, 2006
Posts: 322
Location: A very hot Island with BUGS that KILL!!!
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| Posted: Thu Apr 18, 2024 10:01 am Post subject: Re: Oil Leak under load/at speed |
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I had that issue since day one on a freshly built 1776cc in 2007 with a BMD pulley. The cause: the BMD pulley. Since it's crank triggered with the wheel being in that pulley I had to put a sand seal on it.
Problem solved.
Now I have the same block with a 2109cc turbo engine with the BMD pulley and no issues.
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