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   Emissions and Crankcase Ventilation 
         A Study and a fix....   for a Triumph GT6

6 /2003 a work in process... lots of quick info thrown out here...
hopefully we'll add updates shortly ..and fill in a
few of the info gaps .

   Emissions and Cranckcase Ventilation Issues

Home   Research and decision making    Standards and calculations    Exhaust scavenging     D-I-Y   
     Many of our LBC's suffer from terminal oil leaks. And I'll bet many of you have replaced oil pan and rocker cover gaskets multiple times, only to have them continue leaking.  Well don't blame the gaskets. Blame the engine design, and years of wear and tear of normal operation.

   This study, started as a result of Big Red (my '73 GT6 MKIII), unlike any of my other LBC's, simply refusing to be potty trained. (stop leaking oil in the driveway.)

   So where to start... well certainly not where I did during this study!   I'll try and save you all a bunch of work and brain scramble here by not getting into too much detail as to the how's and whys. I'll just present my 'thoughts' and the resulting 'attempts' at each stage of resolving this issue.

The following info compiles into three (or more) test sequences and system models. After many tests, the last defines the combination of things I settled on as of the writing of this article.

 

PROBLEM:I have oil blowing out the dipstick, and/or...  I can't seem to stop the oil from leaking around the valve cover.  Or the rear of the moto drips oil on the exhasut pipe....etc etc...
RESOLUTION: Drive the car without the oil filler cap installed, and see if it still blows oil.

     If the oil stops coming out all the seems,  it's probably crankcase pressure being built up by compression ring blowby and valve guide leakage.  Opening the cap simply let's the crankcase pressure escape. 

     How do I know how much 'blow-by' is a problem?  A better question might be to ask... How do you measure blow-by?

OK...  now how much is bad... how much is OK?

 

   Emissions and Cranckcase Ventilation Issues

Home   Research and decision making    Standards and calculations    Exhaust scavenging     D-I-Y   

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last edited 
3/15/08

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