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  #301  
Old 10th January 2020
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I don't think that'll work without modding.
The oil pumps feed differently.

86-90 pump feeds out of the pump to the filter and back into the pump to feed a vertical drilled hole in the lower case to the upper feed galley.
91-up pump feeds from the pump to the filter and from the filter thru a horizontal drilled hole IN the upper feed galley.
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  #302  
Old 10th January 2020
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Many thanks for the information. So a '91 upwards cam cover is the one I need. The one I have has been modded (cut back too much on the rear) and I'm wanting to make it flow nice with the kicker conversion I have.

Cheers for the information 👍
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  #303  
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Default Valve stem seals

So I'm definaltey doing the Cam chest vent (Thanks to Deimus for coming up with the solution and all you guys for the testing and further discussing in the threads). I ran into the leaky valve stem seals issue, always had oil mist in the manifold and intake ports even though my head breathers are venting to the atmosphere...that means obviously they are submerged in oil which is pooling up n not circulating fast enough due to the stock venting system. I run my sporty hard but at just 11k miles the valve stem seals failing is strange. Also the "T" between the oil bag and stock cam vent is a no-no for me, especially without a krankvent or a PCV valve.

Cam Chest vent :
1. Drill n Tap the Cam cover at the 3 o'clock position (refer org pics)
2. Make a baffle for the inside to reduce oil splash.
3. 90° NPT brass elbow fitting with silicone/plumbers tape and hose line of choice with clamps.
4. Krankvent to exit pressure and block atmosphere going in (PCV valve if KV unavailable at ur region), plus add a catch can.
5. Block off Head breather's with solid bolts for pressure to help circulate oil better (removal of umbrella valve assembly and fill cavity with high temp silicone optional)

Ok, now while researching i came across an interesting article about the valve stem seals (link below)..these guys did some testing n mods, did comparisons of the -02 vs -02A seals. The mod they did is drilling holes at the 90° spring seat of the seal to reduce the oil pool up due to the pumping effect from the rubber seal itself. They exchange test notes with another company which was looking into the matter also n found the rubber seal seat was also allowing oil in..solution was to bond the rubber seal to the metal seat itself.

http://www.bigboyzheadporting.com/showthread.php?t=90

So they came up with a newer seal based on the findings which is on sale on their website. Experts plz do chime in and has anyone tried to experiment with drilling holes at the 90° spring seat area like in the pics with positive results or will i be one of the first to do it. Thanks again for the valuable input.

P.s
Why can't i post pics directly n have to use a link of the image sharing site?
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  #304  
Old 4 Weeks Ago
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I have not looked at this thread in years. will add a bit I have learned. Make sure you fit the exhaust you are going to use before you decide where to drill the cam cover, I did mine with a Supertrapp only to find when I put on a Patriot Defender it would no longer work.
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  #305  
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My old seals were hard as a rock. Between the upgraded seals and what I strongly suspect is better oil return from the heads with the cam chest/krankvent, I don't think drilling the holes is necessary.
One thing I noticed is little to no air bubbles in the tank. A sign there's more oil present in the sump TO be scavenged and it's not scavenging air.
You won't be disappointed.
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  #306  
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Quote:
Originally Posted by Bored now View Post
I have not looked at this thread in years. will add a bit I have learned. Make sure you fit the exhaust you are going to use before you decide where to drill the cam cover, I did mine with a Supertrapp only to find when I put on a Patriot Defender it would no longer work.
that's great advice for anyone looking to do this (and they should imo)..I'm running stock headers and moded stock slip ons with Rush 1.75 baffels. Thank you

Quote:
Originally Posted by 60Gunner View Post
My old seals were hard as a rock. Between the upgraded seals and what I strongly suspect is better oil return from the heads with the cam chest/krankvent, I don't think drilling the holes is necessary.
One thing I noticed is little to no air bubbles in the tank. A sign there's more oil present in the sump TO be scavenged and it's not scavenging air.
You won't be disappointed.
since its hard for me to get these new valve seals here or ship them..I'll look into the car industry to try n match these hat type seals...or jus replace the rubber seal, use a sealant between the rubber and seat in addition to drilling the holes.

Yes It would be a little tedious to pull the top end jus for the seals again (dont wanna do that untill the 1250/75 kit) but hey my options are limited where i live. Thanks Gunner
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  #307  
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You might enjoy reading this thread also.
http://xlforum.net/forums/showthread...+guide&page=16

cjburr found that the brand of valve seals was the problem.
NRHS was involved with that and they or Hammerperf should have the better seals and info on that.
They ship worldwide I think.

cjburr also tested his head drains to see if the oil would pool around the seals.
I've added that in the Sportsterpedia here:
http://sportsterpedia.com/doku.php/t...he_head_drains

I haven't read where anybody has drilled the seal on the XLF.
Sometimes mods like that are snakeoil for street engines.
I don't have any knowledge of that though.
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  #308  
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What is the benefit of such a modification?
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  #309  
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Quote:
Originally Posted by Hippysmack View Post
You might enjoy reading this thread also.
http://xlforum.net/forums/showthread...+guide&page=16

cjburr found that the brand of valve seals was the problem.
NRHS was involved with that and they or Hammerperf should have the better seals and info on that.
They ship worldwide I think.

cjburr also tested his head drains to see if the oil would pool around the seals.
I've added that in the Sportsterpedia here:
http://sportsterpedia.com/doku.php/t...he_head_drains

I haven't read where anybody has drilled the seal on the XLF.
Sometimes mods like that are snakeoil for street engines.
I don't have any knowledge of that though.
I always read through sportsterpedia for data on various changes between years etc..was helpful for my suspension mods. I love to read into technicalities n testing so I can plan my mods better and hopefully contribute some..Sportsterpedia is awesome.

Thank you so much for sharing the links Hippysmack, really appreciate it
I'll surely look into the getting the new seals..in the mean time maybe Dan or Aaron can give us a bit more insight into the Valve stem seal situation.


Quote:
Originally Posted by SLW210 View Post
What is the benefit of such a modification?
1. Less to no rocker box gasket leaks
2. Better oil lubrication/circulation
3. Less of a need to half fill the oil tank
4. No head breather dripping (once blocked)
5. Better pressure equalization inside motor?
6. Slightly lower temps overall
7. Less prone to wet sumping

**NO hp or torque gains.
*If no catch can is added, will drip some oil on the floor like a real Harley, so bragging rights I guess.
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  #310  
Old 3 Weeks Ago
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Quote:
Originally Posted by HotRod917 View Post
I always read through sportsterpedia for data on various changes between years etc..was helpful for my suspension mods. I love to read into technicalities n testing so I can plan my mods better and hopefully contribute some..Sportsterpedia is awesome.

Thank you so much for sharing the links Hippysmack, really appreciate it
I'll surely look into the getting the new seals..in the mean time maybe Dan or Aaron can give us a bit more insight into the Valve stem seal situation.



1. Less to no rocker box gasket leaks
2. Better oil lubrication/circulation
3. Less of a need to half fill the oil tank
4. No head breather dripping (once blocked)
5. Better pressure equalization inside motor?
6. Slightly lower temps overall
7. Less prone to wet sumping

**NO hp or torque gains.
*If no catch can is added, will drip some oil on the floor like a real Harley, so bragging rights I guess.

I think he was referring to drilling the seals but your benefits to the cam chest/krankvent mod is pretty much spot on from my experience.
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