77RHINO
Full Member
- Joined
- Feb 22, 2011
- Messages
- 308
Engine Gurus, I'm running low on options. I have a 351w that has maybe 2500 miles on it that burns an incredible amount of oil - I just burned a quart in 40 miles on the interstate this morning on the way to work and back. I have been chasing this issue down for 2 years now, pulled the motor almost completely apart multiple times, swapping intake gaskets, rear main seals, head gaskets, new valve stems (on 2 year-old heads) lapped the valves, checked for warped head/intake surface with a square, swapped valve covers, PCVs, and I just put it back in this past Sunday with new 1262-S3 intake gaskets and I still haven't fixed the issue. I have fixed or looked at just about everything I know to do. I'm not sure if the rings haven't sealed yet, or are bad, or if there's enough vacuum sucking on both sides of the PCV to not allow oil to drain back down into the pan? Please take a look below at the build specs, and let me know your thoughts.
Links to past threads on same topic trying out additional tests:
http://www.classicbroncos.com/forums/showthread.php?t=271861
http://www.classicbroncos.com/forums/showthread.php?t=278529
1996 351w block bored .030 over
Ford Racing GT40X 64cc heads (bought brand new including beehive springs)
Comp 35-514-8 camshaft (.544/.555) (Also called XE266HR-12)
roller rockers
new hyd roller lifters
original pushrods
KB +6.50 Pistons w/ mahle rings (plasma-moly/ductile iron top ring, iron 2nd and 3rd)
factory connecting rods
Edelbrock carb (650) and intake (2181)
195* T stat
PCV routed from top of passenger valve cover into base of carb, oil cap w/line to base of air filter - Now running larger dia. PCV line to increase flow
factory '96 valve covers w/good baffles
WH longtube headers
Compression is probably in the upper 9s
factory ignition
factory coil
Holds about 15-18" of vacuum at idle running roughly 650 rpm
Compression test performed 11/2016 on cold motor after first discovering the massive oil consumption:
1 185 w/oil 215
2 185 w/oil 205
3 185 w/oil 205
4 180 w oil 213
5 177 w/oil 200
6 180 w/oil 205
7 177 w/oil 203
8 185 w/oil 195
*I wasnt able to get a completely equal amount of oil into each cylinder which may be why some readings were lower.
This engine rips, hard, but it just smokes alot. At idle I can barely see it, but if I stomp on it or am decelerating while in gear, its blowing smoke.
Thank you,
Ryan
Links to past threads on same topic trying out additional tests:
http://www.classicbroncos.com/forums/showthread.php?t=271861
http://www.classicbroncos.com/forums/showthread.php?t=278529
1996 351w block bored .030 over
Ford Racing GT40X 64cc heads (bought brand new including beehive springs)
Comp 35-514-8 camshaft (.544/.555) (Also called XE266HR-12)
roller rockers
new hyd roller lifters
original pushrods
KB +6.50 Pistons w/ mahle rings (plasma-moly/ductile iron top ring, iron 2nd and 3rd)
factory connecting rods
Edelbrock carb (650) and intake (2181)
195* T stat
PCV routed from top of passenger valve cover into base of carb, oil cap w/line to base of air filter - Now running larger dia. PCV line to increase flow
factory '96 valve covers w/good baffles
WH longtube headers
Compression is probably in the upper 9s
factory ignition
factory coil
Holds about 15-18" of vacuum at idle running roughly 650 rpm
Compression test performed 11/2016 on cold motor after first discovering the massive oil consumption:
1 185 w/oil 215
2 185 w/oil 205
3 185 w/oil 205
4 180 w oil 213
5 177 w/oil 200
6 180 w/oil 205
7 177 w/oil 203
8 185 w/oil 195
*I wasnt able to get a completely equal amount of oil into each cylinder which may be why some readings were lower.
This engine rips, hard, but it just smokes alot. At idle I can barely see it, but if I stomp on it or am decelerating while in gear, its blowing smoke.
Thank you,
Ryan