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the difinitive prechamber size thread
by
NintendoKD
on 27 Feb, 2010 10:15
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Ok, so I stared this thread in the hopes that it could be added to the faq, in the way that others may use the information therein. It occurs to me that precups are becoming more and more dificult to come by, and there must be a solution, however, until that solution is discovered, we are stuck to using precups from another head, USED. Willl this fit that, that sort of thing, will 1.6 N/A fit AAZ? will 1.5 fit 1.6 Turbo? what are the dimensions and gains/losses of said swaps. There is a lot to be learned gents so please pipe up.
thanks,
Kevin
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#1
by
MRTANGOMAN
on 27 Feb, 2010 18:02
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#2
by
MRTANGOMAN
on 27 Feb, 2010 18:37
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ok some sizes in mm
width @ head face width inside head height of the flange
1500 diesel (oem p/n 068103391) 30 25.35 3,75
1600 n/a td (oem p/n 069103391) 32 27.3 4
1900 n/a 30 25.35 4
1900td (oem p/n 028103391m) 32 27.8 4
ALL MEASUREMENT TAKEN FOR THE WEB SITE LISTED IN MY POST ABOVE!!
THESE ARE FOR REFERANCE ONLY , ANY MISTAKES, NOT DOWN TO ME
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#3
by
NintendoKD
on 27 Feb, 2010 19:28
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thanks tango, this should be very useful to many here on the forum. any way you could get pictures for comparison? or pictures period, there may be other differences that are pertinent.
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#4
by
maxfax
on 27 Feb, 2010 20:21
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IIRC, someone once mentioned that there is a difference in the cups between the hydro and mech heads. I don't recall what this difference was supposed to be, but I recall this coming up at one point...
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#5
by
rabbitman
on 27 Feb, 2010 21:47
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#6
by
NintendoKD
on 27 Feb, 2010 23:02
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hence the nice, short, thread with up-to date information.
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#7
by
NintendoKD
on 25 May, 2010 01:16
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I agree, does someone have access to the 1.5 1.6N/A 1.6 TD and 1.9 cyl heads as well as the L5 audi/VW head then we can get some real answers.
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#8
by
Rabbit on Roids
on 25 May, 2010 11:29
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i have 1.5 cups, 1.6 n/a cups 1.6 TD cups, and audi 2.0 5 cyl cups.. what measurements do we need?
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#9
by
NintendoKD
on 25 May, 2010 11:40
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actual cc containment, diameter both at the bottom and at the lip, in other words, to find out if the prechambers can be exchanged from one head to the next.
thanks ROR,
Kevin
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#10
by
Rabbit on Roids
on 25 May, 2010 12:22
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i have no way to CC these things, unless its with water and a graduated syringe.. and thats just going to be a close measurement. i have a set of standard calipers. nothing beyond that really.
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#11
by
745 turbogreasel
on 25 May, 2010 17:08
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I know on the GM diesels, the port varies in shape and size by application as well.
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#12
by
NintendoKD
on 25 May, 2010 20:35
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maybe there is a tech page somewhere that lists the cc containment no's but the depth and diameters, as well as other dimentionL details will be very helpful in this thread maybe one of our senior members can assist with this. Maybe a Machinist? Jedi Master Giles?
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#13
by
Rabbit on Roids
on 25 May, 2010 22:23
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I know on the GM diesels, the port varies in shape and size by application as well.
on GM's the n/a J-code heads have the biggest ports and flow the best in factory form.
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#14
by
NintendoKD
on 28 May, 2010 03:08
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Thats interesting. I've computed the following from engine data tables:
1.5 Swirl chamber volume 11.457 cc
1.6 Swirl chamber volume 12.794 cc
1.9 Swirl chamber volume 16.376 cc
found this in another thread, thanks krautster