Motor burns oil

Old 08-07-2010, 07:19 AM
  #1  
davelee
Junior Member
SHOW GUEST
Thread Starter
 
Join Date: Nov 2004
Posts: 7
Default Motor burns oil

Hi,
I just built a new big BBC 622, and it is in a street car. The block was cross hatched honed with 400 grit. The motor is a 4 3/4 stroke with 6.700 inch rod. I am running total seal gapless top ring. The rings are 1/16, 1/16, 3/16. After I broke the engine in I put in valvoline racing oil 20/50 . I have a couple 100 miles on the motor and it seems like it burns maybe 1/2 qt per 30 to 40 gallons of gas. This is my first big inch motor. Is this normal for a motor this size? or did I over look something?
Thanks
davelee is offline  
Old 08-07-2010, 07:45 AM
  #2  
kwkracing
Senior Member
RACING JUNKIE
 
Join Date: Dec 2004
Location: austin texas
Posts: 729
Default

probably not. If it was built as a race engine it has a few extra thousands on some things and probably has no exhaust valve seals. Which is not a bad thing.
kwkracing is offline  
Old 08-07-2010, 11:53 AM
  #3  
davelee
Junior Member
SHOW GUEST
Thread Starter
 
Join Date: Nov 2004
Posts: 7
Default

It has New teflon valve seals on the intake and exhaust valves
thanks
davelee is offline  
Old 08-07-2010, 06:41 PM
  #4  
chevy582r10
Junior Member
SHOW GUEST
 
Join Date: May 2010
Posts: 7
Default Re: Motor burns oil

Originally Posted by davelee
Hi,
I just built a new big BBC 622, and it is in a street car. The block was cross hatched honed with 400 grit. The motor is a 4 3/4 stroke with 6.700 inch rod. I am running total seal gapless top ring. The rings are 1/16, 1/16, 3/16. After I broke the engine in I put in valvoline racing oil 20/50 . I have a couple 100 miles on the motor and it seems like it burns maybe 1/2 qt per 30 to 40 gallons of gas. This is my first big inch motor. Is this normal for a motor this size? or did I over look something?
Thanks
I built a 400 with 6 inch rods once. The wrist pin was way up in the oil ring. That thing burned oil big time with 20w50 in it. Maybe a quart every 150 miles or so. Changed the oil to 10w30 racing oil and could get about 2K miles to a quart. I figure the rings just couldn't control the heavier oil as easily. I never got to find out exactly why. I've built a bunch of other engines similar to this with no problem since then.
chevy582r10 is offline  
Old 08-10-2010, 12:05 PM
  #5  
oldandtired
Senior Member
RACING JUNKIE
 
oldandtired's Avatar
 
Join Date: Dec 2008
Location: Sugar Hill, GA
Posts: 1,370
Default

Do you have the low tension oil ring package?
oldandtired is offline  
Old 08-10-2010, 01:50 PM
  #6  
TheRabbit
Senior Member
RACING JUNKIE
 
TheRabbit's Avatar
 
Join Date: Jan 2007
Location: Augusta, Ga.
Posts: 2,295
Default

Originally Posted by oldandtired
Do you have the low tension oil ring package?
X2.
And I wouldn't run 20/50. The thicker oil with low tension rings will make it burn oil worse. I used 10/30.
TheRabbit is offline  
Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off


Contact Us Archive Advertising Cookie Policy Privacy Statement Terms of Service