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sbc burning oil

31K views 30 replies 9 participants last post by  red65mustang 
#1 ·
Freshly built 383 all new. I have to add 1/2 qt oil every weekend (about 50 mi. cruising). Blue smoke starting and on decelleration but not while idling, cruising, or on hard accel. Had to put in 3 air filter breathers in valve covers and a PCV to carb to keep valve cover gaskets sealed. Any ideas?
 
#27 ·
CNC BLOCKS NE said:
If you thinks its the rings try a leak down test at TDC and if they are over 7% on a new engine some thing is wrong.
I'll give that a shot but only if my current and very obvious pcv issue doesn't completely resolve the problem.
I must definetly be hotrodding because I seem to be customizing everything. I spend more time trying to find the stuff that Will bolt on than it would take to alter something to fit (probably just lack of experience). The windage tray I had required longer main studs than I already bought and would be as much as 3 more months before anyone would have them (I know, lame excuse). And the valve covers are some cheap chrome ones that are starting to spot rust and may be warped ("torque spec, whats that?" jk). Probably good for test subjects on trying out my baffle making skills.
Trying not to jinx myself but I think fixing the pcv deal will solve my current problem. I'll try out some baffles and drive some more this wknd.
Seriously thanks everyone but especially red65mustang (I guess ford guys aren't all that bad, lol jk).
 
#28 · (Edited)
derek,
(for everybody who posted and helped)
thanks for saying thanks,,,,way to many people on this board never do,,,,they just disappear.....

nah, I don't "bleed Blue", there's good and bad in any brand.....
(the 65' fastback is kind of a "heirloom" project, I got my first license in my dad's new 65' fastback and it will be handed down to my grandson,,,,plus my dad got to enjoy this one some before he passed away)

footnote:
(agreeing with CNC)
after about 500 break in miles on a new motor...
it is a smart move to do a leak down and/or compression test and WRITE DOWN the results.....
for future testing reference data!!!!
(even if there are no problems)

post a method and results update later on????
"crummy covers" comes up on this board pretty often.....
may just help someone else
 
#29 ·
derekg383 said:
Freshly built 383 all new. I have to add 1/2 qt oil every weekend (about 50 mi. cruising). Blue smoke starting and on decelleration but not while idling, cruising, or on hard accel. Had to put in 3 air filter breathers in valve covers and a PCV to carb to keep valve cover gaskets sealed. Any ideas?
Classic symptom of oil getting down the intake valve guides.

- Look for missing or defective stem seal.

- Guide to stem clearance excessive.

Bogie
 
#30 ·
I plan on changing plugs when I do the compression & leakdown tests. Can't find the plugs I use locally (Autolite 3923 race plug) have to order.
Kind of off the subject but should I use race plugs on the street? I run a colder plug for nitrous.
Anyway, I'll definetly post the results asap.
 
#31 ·
good grief!!!
you wait till post #30 to tell us you run nitrous!!!!!

pull the plugs and carefully inspect them that all 8 are indeed equally yuch with oil deposits indicating the pcv source....
if some are clean(er), do a compression test now.....

once the pcv oil supply is cut off the chambers and plugs tips electrodes will clean themselves given enough miles....
 
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