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PreCup question
by
Kudagra
on 31 Mar, 2010 11:14
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On my recently resurfaced head...my precups dont fit snug..actually they fall out if I turn the head over.
Is there a way to fix this or do I have a pretty aluminum paperweight?
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#1
by
Rabbit on Roids
on 31 Mar, 2010 13:12
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ive seen people peen the cups in there. dont know if i would personally do it for the fact that it adds a small amount of surface area to the head. or maybe im just over thinking that whole surface area thing. anyway, seen them peen'd in before.
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#2
by
Kudagra
on 31 Mar, 2010 13:33
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ive seen people peen the cups in there. dont know if i would personally do it for the fact that it adds a small amount of surface area to the head. or maybe im just over thinking that whole surface area thing. anyway, seen them peen'd in before.
I might be coming through with a 1.9 head so this might all be moot. Im going to try shuffling precups between a few heads I have and see if I can get them to fit any better.
Can the precups actually Fall out into the cylinder?? I thought the edge of the cylinder would hold them in. Doesnt the fire-ring of the head gasket lay right across the center of the cup?
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#3
by
clarkrep
on 31 Mar, 2010 14:09
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Yes, the headgasket supports part of it. I've never had one fall out but have heard about it. I just can't see how they could fall out since they're so tall.
I'm sure there are carnage pics here somewhere.
I might have some extras you can try. I live like 10 miles from Baldwin City. IM me.
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#4
by
Kudagra
on 31 Mar, 2010 15:22
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Yes, the headgasket supports part of it. I've never had one fall out but have heard about it. I just can't see how they could fall out since they're so tall.
I'm sure there are carnage pics here somewhere.
I might have some extras you can try. I live like 10 miles from Baldwin City. IM me.
Did I chase you down on I70 between Lawrence and Topeka? Stopped at the service center? I was in my service van.
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#5
by
clarkrep
on 31 Mar, 2010 15:37
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Maybe, I could have been driving a silver 79 four door na diesel or black 83 GTI with a TD.
How long ago?
Aaron
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#6
by
Kudagra
on 01 Apr, 2010 09:46
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Maybe, I could have been driving a silver 79 four door na diesel or black 83 GTI with a TD.
How long ago?
Aaron
Few weeks maybe. It was black rabbit.
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#7
by
burn_your_money
on 01 Apr, 2010 09:55
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If they are that loose I personally wouldn't trust just peening.
I'm not sure if knurl is the right word for what I'm thinking of but if it is then that's what I would do.
Clear as mud?
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#8
by
Rabbit on Roids
on 01 Apr, 2010 11:11
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like what they do to ratchet handles for traction?
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#9
by
wolf_walker
on 01 Apr, 2010 16:21
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like what they do to ratchet handles for traction?
As in knurling valve guides.
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#10
by
truckinwagen
on 01 Apr, 2010 16:23
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while knurling is a good way to increase outside diameter, I would like to see the knurling machine that would happily do it to the inconel of our precups...
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#11
by
NintendoKD
on 02 Apr, 2010 03:16
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superalloy=knurling NO, Cracking/shattering YES
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#12
by
wolf_walker
on 02 Apr, 2010 17:28
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Softer pre-cups would make some things a lot easier if they'd hold up. I know some exist on cheapy "new" heads,
do they last?
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#13
by
NintendoKD
on 02 Apr, 2010 19:46
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for the average joe maybe, but for the boost limit seeking enthusiast, like me, that is a resounding no.