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external oil feed to head 15 Apr 2018 08:57 #781842

  • larslykkegaard
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where do i get info on making external oil feed line for the cylinder head on a kz1000

pictures and how to adn NOT to do

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external oil feed to head 15 Apr 2018 10:00 #781850

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To dry block your engine.
1. Plug the 2 crankcase oil galleries at the 2 rear outer studs with grub screws..

Then plug the 4 diagonal feeds ( where the zip ties are ) in the head in the same manner.

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external oil feed to head 15 Apr 2018 10:15 #781851

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why blok the original once?
im running ape studs in which are bigger than stock so though that and extra oil line would just be better - what do you do in the head?? do you just pull og drill the the plugs out?
(its a z1000 head and not J )

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external oil feed to head 15 Apr 2018 10:24 #781852

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Next remove the blanking plugs in the head.
I drill up the center of them ,tap m5 and the use a nut and bolt with a spacer to extract them.

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Next I drill a pilot hole for a counter bore.

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So i can face the head to provide a flat sealing surface for the oil feed banjo bolts copper washers.

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Then tap the holes to take 10mm banjo bolts or AN4 fittings .
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external oil feed to head 15 Apr 2018 10:28 #781853

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It's the same for any of the 900 to 1100 heads.
You either need to dry block or just run a 12mm drill down the 2 rear outer stud holes to give clearance for the oil to get past the HD studs.
If you drill the barrels you also need to do the head just deep enough to reach the diagonal oil feeds to the cams.

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external oil feed to head 15 Apr 2018 10:35 #781854

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If you do the external lines you can take feeds off the end of the main oil galley, the oil pressure switch or an in line splitter from oil cooler lines.
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external oil feed to head 15 Apr 2018 10:35 #781855

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was thinking about only doing it on the exhaust side and then keep the oil from the studs...
still flows oil up around hte HD studs, but its in the exhaust you have the heat and that cam is the last to get anything..

Would this be any problem

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external oil feed to head 15 Apr 2018 10:54 #781857

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Won't do any harm just feeding extra to the exhaust side but it is sort of defeating the object of external feeds and I would still open up the barrel at the rear 2 studs.
Because of the way they are cast the holes on these blocks taper inwards from each end and in some cases the HD studs barely squeeze through leaving very little clearance for the oil flow.
I run a 12mm drill through them and it gives the same clearance as you would have with the stock studs.
With the stud holes opened up you won't really need the exhaust feeds,.
My Turbo drag bike just runs the opened up holes and has no issues with exhaust cam oil starvation.

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external oil feed to head 16 Apr 2018 09:28 #781899

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Lars! Something I forgot to mention.
Once the head has been drilled, tapped and spot faced for the banjo there is only around 7mm of thread before it intersects with the original diagonal oil feed.
The banjo bolt needs to be at least double its length into aluminium to avoid stripping out at the correct torque so will blank off the original feed.
The cam won't really get any additional oil by adding the external line except a slightly cooler supply as it won't be running up inside the hotter block.

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external oil feed to head 16 Apr 2018 11:37 #781906

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thanks - ill look into it the next few days (especially the last you write about the 7mm thingie - thats interesting
its going on a 1260/1328cc mr turbo setup in which ill only use for the strip mostly

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external oil feed to head 16 Apr 2018 13:44 #781910

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If you have got a big block or bored out cases you really need to dry block the case.
It will save problems in the long run.
The base gasket is very prone to leakage when the cases are bored due to the reduced area.
Same goes for the head gasket if you are using a copper one.
This is the reason why dry blocking was devised.

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external oil feed to head 01 Jun 2021 16:36 #849441

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Very cool! Could you possibly list the parts needed to do this? Also unclear as to where the lines go into on case. Much thanx!! 
1982 KZ1100

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