300hp to 400hp upgrade
11-17-2017, 01:40 PM
#162
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I've seen the size of the oil orifice in the top of the block at the head gasket where it feeds oil to the Head. It is already quite small. Taking a lot of that oil away from the cams and valves might be a bit of an issue. And if you have a journal bearing turbo that might limit your oil a little as well.
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11-18-2017, 11:15 AM
#165
As clean as the head port is, I don't like it. The head is fed through a fairly small orifice, so the pressure/flow is already restricted, and pulling from that doesn't seem like a good idea (and the data that DKMakinson posted backs that up).
There's also the fact that Mazda went through the hassle of re-drilling and re-tapping those ports in the block when they did the MSM, instead of just pulling the oil from the head. We'll be sticking with a block feed for our kits.
There's also the fact that Mazda went through the hassle of re-drilling and re-tapping those ports in the block when they did the MSM, instead of just pulling the oil from the head. We'll be sticking with a block feed for our kits.
Read Joe's last comment on that thread. It makes sense.
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11-18-2017, 01:20 PM
#166
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I wouldn't do that. Look, the orifice in the block that feeds the head was sized to give the head proper flow. It is true that there's probably some over engineering, safety factor there 
That would be like intentionally running a smaller oil feed restrictor than the correct size to your turbo. Just doesn't seem like the best idea to me.
Maybe oil flows better to the head in Oz
That would be like intentionally running a smaller oil feed restrictor than the correct size to your turbo. Just doesn't seem like the best idea to me.Maybe oil flows better to the head in Oz
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11-18-2017, 09:39 PM
#167
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We've done over 100 easily.
We have had a bunch apart years after doing them and the cam journals and all wear surfaces look normal.
It's a super clean way to do it and seems to work fine... But that's just like... my opinion, man.
Dann
We have had a bunch apart years after doing them and the cam journals and all wear surfaces look normal.
It's a super clean way to do it and seems to work fine... But that's just like... my opinion, man.
Dann
Last edited by nitrodann; 11-19-2017 at 02:00 AM.
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11-19-2017, 02:18 PM
#169
I too have looked at that spot, and was gonna use it till I realized the whole block/restrictor thing and then I didn't. Interesting that others are running it without issue though. Has anyone measured oil pressure out of that spot? I can't imagine it being as high as pulling from the usual location.
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11-21-2017, 06:54 AM
#172
Hey, check out those AN fuel line adapters if you don't already have them!
Edit: im crabby because enough people in my branch conveniently called out "sick" to the point where I'm sitting idle without support to finish projects.
I can't even doodle on SolidWorks because licenses haven't been updated.
Last edited by psyber_0ptix; 11-21-2017 at 08:50 AM.
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11-22-2017, 08:24 AM
#175
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On the turbo oil feed. I have been running that for 10k street miles. Small journal turbo with a 1mm restrictor at the turbo feed. I have not pulled the valve cover since install.
I moved my OEM (1999) oil pressure switch to the head port on the opposite side. It always registers with the engine on, so that would indicate no less than 7psi at the head gallery.
I ran preliminary pressure tests on that port years ago, but Brain questioned my methodology.
Perhaps putting the gauge at the port where I now have my switch would be a good way to put this discussion to bed? Test pressure with and without the turbo feed, and that would tell if the head gallery is being starved.
I moved my OEM (1999) oil pressure switch to the head port on the opposite side. It always registers with the engine on, so that would indicate no less than 7psi at the head gallery.
I ran preliminary pressure tests on that port years ago, but Brain questioned my methodology.
Perhaps putting the gauge at the port where I now have my switch would be a good way to put this discussion to bed? Test pressure with and without the turbo feed, and that would tell if the head gallery is being starved.
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12-04-2017, 11:49 AM
#177
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However Dan suggested that drag cars have gone many miles without issues in that configuration. I will run the block feed on the intake side personally.
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