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Is 8" Enough?


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#1 artbuc OFFLINE  

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Posted October 29, 2013 - 05:11 PM

Lol! Re my Kohler Magnum M18S, specs say compression should be at least 90 psi with both cylinders within 15% of each other. Crankcase vacuum should be 13-20" water at 3200-3600 rpm. Well, my compression is fine at 110/115 psi but my crankcase vacuum is low at only 8" of water. I checked vacuum with and without muffler so I know muffler is not restricted. Also, I inspected the breather and it is fine. She starts fast and runs great. Should I be concerned about the low crankcase vacuum? Thanks.

Edited by artbuc, October 29, 2013 - 05:12 PM.


#2 LilysDad OFFLINE  

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Posted October 29, 2013 - 06:07 PM

You should be embarrassed for yourself. Trying to get attention like that!


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#3 MH81 ONLINE  

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Posted October 29, 2013 - 06:11 PM

If your vac drops low, I think the first thing to suffer will be your fuel pump.. I remember reading that the low restriction air filters can affect vacuum. Also, I think the breather leaking can cause some issues.

#4 glgrumpy OFFLINE  

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Posted October 29, 2013 - 08:18 PM

Crankcase Vacuum??  You are first guy I've heard of who cared or had way to measure. If it runs right and no leaks or smoke, who cares about Vac?    Just my 1/2 cent here! ha!



#5 marlboro180 OFFLINE  

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Posted October 29, 2013 - 08:33 PM

LMAO Rich...


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#6 bgkid2966 OFFLINE  

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Posted October 29, 2013 - 08:38 PM

Crankcase Vacuum??  You are first guy I've heard of who cared or had way to measure. If it runs right and no leaks or smoke, who cares about Vac?    Just my 1/2 cent here! ha!

 

 

I agree.



#7 artbuc OFFLINE  

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Posted October 30, 2013 - 02:35 AM

I agree.


Thanks. I checked it because my front oil seal had come loose out of the block and I had to pull the engine to replace it. Wanted to be sure it was not due to crankcase over pressure. I already had a manometer which I had made to fix my gas furnace.




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