why temp difference left and right , exhaust ?


Asked by Apr 24, 2012 at 12:28 PM about the Volkswagen Beetle

Question type: Maintenance & Repair

great  running  69'  .   starts right up ,  and  runs  like  it   should , or ,  so  it  seems  ..    there   is  quite a  difference   
in  exhaust temp  ..  left  and   right  ...   with   the  right side ,  much  hotter   ....  i  put a  72'   dual port in it , out  of a  
junker  ..    could   this   be   valve  adjustment  issues  ?    my  first   bug  ,   $  300  ,  in  the  weeds  ,   and  $400  
later  it   is  about   to  hit  the  road  again   ..   

3 Answers


Sounds like a carb adjustment is needed...One side running leaner than the other...

2 people found this helpful.

The engine appears to be a dual port. I have had that problem on a couple of engines and it turned out to be sucking air around the head to intake runner. Spray carb cleaner around the gasket with the engine running and see if it makes a difference. If it smooths out change the intake gasket. Hope this helps

2 people found this helpful.

The pre- 1971 type 1 engines had the oil cooler in the cooling air path of the left cylinders. Because of this, the ignition timing on the number three cylinder is retarded 3 degrees. This makes the cylinder head run slightly cooler than the right side head. If you have an EGT probe on each side of the engine, the temperatures will be different unless the probes are mounted exactly in the same place on the number [1 and 4] or [2 and 3] cylinders. That is nearly impossible to do with a stock exhaust system unless the probes are within just a couple of inches of the head. Dual port engines had the oil cooler relocated forward of the cooling fan shroud in their own "doghouse." Dual port heads on a pre- 1971 case will need some different sheet metal, too, so your engine might be a mixture of both types...

1 people found this helpful.

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