Your valve guides are probably a little worn. Going downhill with the
throttle closed creates high manifold vacuum, which is enough to suck
oil down the valve and into the cylinder to be burned.
You can fit valve stem seals to help. I'm not sure if they were a
factory item, but I seem to remember that certain Ford ones will fit.
Hopefully someone will chime in with more specific info.
-=Chris
<-----Original Message----->
From de Brebisson, Cyrille;de Brebisson, Cyrille
Sent: 9/30/2004 9:12:41 AM
>To: bushwacker4@zoomtown.com;spridgets@Autox.Team.Net
>Subject: Re: Burning oil when using compression breaks
>
>Hello,
>
>Yesterday we went with the local British Car Club for dinner. The drive
>took us over a 7miles up and down hill.
>The guy behind me told me that while doing OK uphill, I was blowing out
>blue smoke (read oil) on the way down when using the friction break (I
>think that this is how you call it in the US, you know when you just
>remove your foot from the accelerator, stay in gear and let the engine
>rev slow down the car). I was doing around 60 at 3500rpm in 4th gear on
>the 1500cc Midget low compression.
>
>Any idea why this is happening and if there is anything that I can do
>(short of rebuilding the engine of course).
>The compression number on the car look normal at around 150 each
>cylinder, but I have never done a leak down test.
>
>Thanks, cyrille
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