Oil in the Air Box

  • daveo
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Oil in the Air Box

05 Jul 2024 19:39 - 05 Jul 2024 20:03
#901804
Was finding oil puddling in the bottom of my air box...

It was coming out the rubber hose that connects the breather cover to the air box, and making a bloody mess...

Is that a common issue with the big fours?




1982 KZ1100-A2

Last edit: 05 Jul 2024 20:03 by daveo.

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  • SWest
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Re: Oil in the Air Box

05 Jul 2024 22:19 - 05 Jul 2024 22:25
#901806
Probably, but not more than usual...well, maybe a little.



But I don't feel guilty...she likes it you know.

 
1982 KZ1100-A2

Last edit: 05 Jul 2024 22:25 by daveo.
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Re: Oil in the Air Box

06 Jul 2024 01:38 - 06 Jul 2024 01:41
#901809
Time for a compression test. Oil in the air box is caused by excessive positive crankcase pressure due to compression blowby then venting through the crankcase breather. 

Z1000J2 somewhat modified!

Last edit: 06 Jul 2024 01:41 by Warren3200gt.
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Re: Oil in the Air Box

06 Jul 2024 02:04
#901811
Excess crankcase pressure can also be caused by a blockage/restriction in the breather system
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Re: Oil in the Air Box

06 Jul 2024 02:16
#901812
.............................................or overfilling the crank with oil.
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Re: Oil in the Air Box

06 Jul 2024 06:03
#901816
How much oil?  Some light residue is normal.  A puddle, is not.  Also, what type of oil are you using?  It may be time for 20W-50, if you ride when it's warm.

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Re: Oil in the Air Box

06 Jul 2024 13:21 - 06 Jul 2024 13:27
#901829
Been using Rotella 15W40 T4...
Wasn't finding much oil, but residue buildup over the span of several 5-8k rpm rides.

This stopped that completely:



...and there are no oil leaks anywhere on the motor!




Dry as a bone!




1982 KZ1100-A2

Last edit: 06 Jul 2024 13:27 by daveo.
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Re: Oil in the Air Box

06 Jul 2024 16:28
#901840
Yeah, That's why I put oil vapor catch cans on my cars.
Gotta love sending oil vapors into your cylinder.
Drops the octane value on your gasoline.
Which makes you more susceptible to detonation.
Not emissions friendly but I reroute the hose to vent below the bike. Plug the airbox fitting.
You could put a pressure gauge on the hose to see how much blowby you are getting.

Mike Nixon's opinion on this
motorcycleproject.com/text/crankcase_recirc.html
 
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Re: Oil in the Air Box

06 Jul 2024 18:09 - 06 Jul 2024 19:16
#901842
7/06/24 compression check results:
 cyl      psi
1 & 4  160
2 & 3  145-150




Half a quart of oil evaporated on today's 100 +/- mile ride...

She loved every breathtaking moment through which we flew!!!




 
1982 KZ1100-A2

Last edit: 06 Jul 2024 19:16 by daveo.
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Re: Oil in the Air Box

07 Jul 2024 04:37
#901846
Been using Rotella 15W40 T4...
Wasn't finding much oil, but residue buildup over the span of several 5-8k rpm rides.

This stopped that completely:



...and there are no oil leaks anywhere on the motor!



 
Love that solution Dave, is that "ram air" filter foam or something similar that won't cause a pressure build up??

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Re: Oil in the Air Box

07 Jul 2024 06:14 - 07 Jul 2024 06:18
#901851
Yes, and it performs much better than expected.

It's a strip cut from a sheet of RamAir filter media I acquired nearly ten years ago.

It may be similar to the material used in their product offerings today.
 







 
1982 KZ1100-A2

Last edit: 07 Jul 2024 06:18 by daveo.
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