Been to Sebring, FL four times now. At the end of the day last time I had a few puffs of smoke come through the cockpit. I thought it was from locking up the brakes on a turn. Turns out somehow a little bit of oil got on the headers and that was the cause. Air in the engine bay is turbulent so I was not able to pinpoint where the oil came from exactly. There was oil on the front of the pan and it turns out the washer seal was bad and a little bit of oil was running down the frame rail bottom. I assumed enough collected, went airborn, hit the header, and there was the cause of the puff of smoke.
Went again this past Sunday....long story short, the longer I was out there the more puffs of smoke I got, only on hard right turns! Popped the hood and turns out the oil was making it's way up the Dipstick tube and dripping onto the header. Just a small amount, but that is the source. Not leaking at the block, it's leaking at the top of the tube. Should there be some type of o ring seal at the top of the tube or do I have to swap something out that mecanically seals which is better for HPDE events.
If you are blowing oil out the dipstick you need to vent the engine better. You are making a lot of crankcase pressure and it will try to escape the easiest way it finds. That is usually the dip stick. Clamp the dip stick closed and you will start seeing oil coming out the seals.
__________________ email@example.com Pro Builder and Go Fast Specialist
99/2000 NASA PSO Champion in a FFR
2005 FFR Challenge West coast Champions 2nd 2005 Nationals Sponsor for Tony B. ST-2 National Champion 2007
2009 TTC runner up-2010 TTB Runner up
Over 155 Turnkey FFR's in 16 years and still counting
I have also seen it where the dipstick tube is not supported well enough and the vibration just works the dipstick up a little ways.. Put a piece of safety wire or zip tie on the loop at the top of the dipstick to hold it in place. If it was caused by blow by (crankcase pressure) - you may see some seepage past seals or gaskets as Gordon points out.
Regards - Randy Racecar Fab/Support GT40 331 - Weber IDAs, G50 5spd 69 Camaro SS 4spd 2007 Toyota Camry Hybrid - 44.2 MPG daily driver 2002 Avalanche 2500 - Avian Target
My GT-40 Build Site: http://www.GT-FORTY.com
Be careful if you're running a PCV to the carb. Oil at the back of the valve covers will pile up and go thru the carb with hard cornering. For track day use run large breathers (no PCV) with hoses running forward and up slightly to puke cans. These engines need a lot of breather capacity.
Your donor dipstick should have a rubber (or perhaps neoprene?) seal of sorts inside the little cap, that snugs it down against the tube top. It's not just metal to metal. Perhaps yours is missing, or worn out?
Make sure your crankcase breather is not pluged. I had the same problem with my old Auto-x Corvette, it used to pull oil back throught the PCV and looked like a crop duster when this occured. I disconnected the PCV and added valve covers with two breathers on each side and it solved my problem.
My engine has a decent crankcase venting system (10AN lines and a stefs tank/breather). The dip stick does come out a little and oil will spray on the header. I usually zip tie it down to the engine and I dont have a problem.
FFR3842, Levy Forged 349ci/500hp, AFR185's, Wilwood 6/4 piston Superlites, Koni DAs, Magnesium bellhousing and Tilton Triple disk clutch, GF5R dog ringed 5 speed, 3link, VPM sway bars, Hoosier A6s, CCW forged wheels, wings, undertray, diffuser
We have had the dip stick vibrate up the tube and cause oil to leak out dip stick tube on many Challenge series cars.
We started using two rubber hoses.
1) First hose (Larger) fits over wide end of dip stick.
2) Second hose (smaller) fits dip stick tube.
3) Larger hose just fits over second smaller hose.
4) Clamp Larger hose to dip stick with hose clamp.
5) Clamp large hose over smaller hose on dip stick tube.
6) Use the small 1/4" hose clamps. Loosen the bottom clamp a little to lift dip stick and measure oil.
Welcome to FFCars! The
representations expressed are the representations and opinions of
the FFCars.com forum members and do not necessarily reflect the
opinions and viewpoints of the site owners, moderators, Factory Five
Racing, Inc. or Ford Motor Company. This website
has been planned and developed by FFCars.com and its forum members
and should not be construed as being endorsed by Factory Five
Racing, Inc. or Ford Motor Company for any
purpose. "FFR", "Factory Five", "Factory Five Racing", and the
Factory Five Racing logo are registered trademarks of Factory Five
Racing, Inc. FFCars.com forum members agree not to
post any copyrighted material unless the copyrighted material is
owned by you. Although we do not and cannot review the messages
posted and are not responsible for the content of any of these
messages, we reserve the right to delete any message for any reason
whatsoever. You remain solely responsible for the content of your
messages, and you agree to indemnify and hold us harmless with
respect to any claim based upon transmission of your message(s).
Thank you for visiting the FFCars.com Forum dedicated to Factory