a4gom
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| posted on 24/2/10 at 11:58 AM |
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JIC fittings
I'm running a return to the sump from an oil / air seperator on the crankcase breather on my R1, there is a well known issue on these engines
(2005 onwards) where they can actually pump quite a bit of oil out when held at high revs (1/2 a litre on a run at curborough!)
I'm trying to figure out what size pipe fittings to use, the crankcase breather is about 11mm ID but thats obviously coming out under pressure,
the return will not be under pressure just gravity so i'm thinking I maybe need to go bigger.
Anyone got a Jic fitting to hand to confirm my findings that the ID of the fitting is 1/16" x the dash size, I've looked at various
catalogues and I'm not convinced the ID they show isn't reffering to the ID of the hose the fitting uses rather than the ID of the fitting
itself which is obviously smaller.
Hope this makes sense, any assistance / advice gratefully received
Andy
Perfect planning prevents pi$$ poor performance!
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ko_racer
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| posted on 24/2/10 at 01:25 PM |
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I have just added this to my engine, used JIC -8 back to the sump.
This is the same an engine tuner I know does.
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flak monkey
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| posted on 24/2/10 at 01:27 PM |
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Jic fittings sizes refer to the OD of the thread in 1/16ths of an inch.
So JIC8 (or -8 or AN8 all the same!) is 8/16" or 1/2" diameter on the threads.
David
Sera
http://www.motosera.com
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a4gom
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| posted on 24/2/10 at 01:57 PM |
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ko_racer, is yours an R1?
If -8's OD is 1/2" whats the ID of the fitting, 3/8" or less? Can anyone measure tell me how to work it out.
My friend got some bits from Demon thieves last week, we can't find the invoice and the fittings are at the garage not with me so I don't
know what size the fittings are but the ID is about 10mm or 3/8"
Andy
Perfect planning prevents pi$$ poor performance!
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ko_racer
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| posted on 24/2/10 at 02:20 PM |
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I've got the 5VY 04-06 R1
I/D of -8 Hose should be 7/16"
Linky
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a4gom
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| posted on 24/2/10 at 02:22 PM |
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thats great thanks
Andy
Perfect planning prevents pi$$ poor performance!
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NS Dev
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| posted on 24/2/10 at 03:10 PM |
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The AN "dash" sizes DO refer to the size of the hose bore (in 1/16ths inch) that the fittings are designed for, nowt to do with the
thread.
JIC threads are generally accepted to be common for each "dash" size, and -6 would be 9/16 x 18 tpi -8 would be 3/4 x 16 tpi, -10 would
be 7/8 x 14 tpi and -12 1 1/16 x 12 tpi
these are all the diameter over the male threaded part of the fitting
Retro RWD is the way forward...........automotive fabrication, car restoration, sheetmetal work, engine conversion
retro car restoration and tuning
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v8kid
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| posted on 24/2/10 at 05:24 PM |
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The bore of the fitting is much less that the hose pipe. You can usefully bore out the fittings to increase the flow on a return pipe which is subject
to less pressure. As the area is proportional to the diameter squared the gain is significant - I gained 20% on my dry sump pipes.
I also bored out the pressure pipes but not to the same extent more of a streamlining to take out the ridges.
No problems so far.
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a4gom
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| posted on 24/2/10 at 05:31 PM |
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v8kid, that was my recollection and the reason for the post but the question got lost somewhere, possibly due to the way I worded it.
It seems obvious to me but surely when designing a pipe run it should be based on the smallest ID i.e. teh ID of the actual fitting as thats where the
restriction will be?
Andy
Perfect planning prevents pi$$ poor performance!
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Brommers
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| posted on 24/2/10 at 06:52 PM |
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On mine I have the home-made air/oil separator which has 12mm pipe at the bottom which fits
onto the top of the external sight-glass which is then connected back to the sump using some
JIC -6 hose. Seems to work fine so far.
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a4gom
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| posted on 24/2/10 at 07:57 PM |
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Brommers, you have U2U
Andy
Perfect planning prevents pi$$ poor performance!
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