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Wastegate valve guide play
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Dutch924-racer  



Joined: 23 Jul 2007
Posts: 1004
Location: The Netherlands

PostPosted: Fri Jan 27, 2017 6:59 am    Post subject: Wastegate valve guide play Reply with quote

How much play may a wastegate valve guide have ?

I asume it can have more play then a valveguide of the cilinder head because in the wastegate it is not oil cooled/ lubricated.

Can you buy a new valve guide somewhere?
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ideola  



Joined: 01 Oct 2004
Posts: 15499
Location: Woodstock IL

PostPosted: Fri Jan 27, 2017 8:37 am    Post subject: Re: Wastegate valve guide play Reply with quote

Dutch924-racer wrote:
How much play may a wastegate valve guide have ?

Good question

Dutch924-racer wrote:
Can you buy a new valve guide somewhere?

Not that I've found

If you take the wastegate apart, be aware that the big fiber gasket between the upper and lower housings is not available anywhere and you'll need to make your own.
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gegge  



Joined: 27 Jul 2007
Posts: 1020
Location: Sweden

PostPosted: Fri Jan 27, 2017 9:34 pm    Post subject: Reply with quote

I hade one with several millimeters of play. Good from a heat expansion point of view, it certainly didn´t stuck. But longlivety of the membrane suffered.

The WG valve is slow moving compared to the valvetrain , no risk of wear or seat damage due to misalignment from valveguide wear.
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Mike9311  



Joined: 14 Dec 2004
Posts: 659
Location: Chicago-ish

PostPosted: Sat Jan 28, 2017 12:22 am    Post subject: Re: Wastegate valve guide play Reply with quote

Dutch924-racer wrote:
How much play may a wastegate valve guide have ?

I assume it can have more play then a valve guide of the cylinder head because in the wastegate it is not oil cooled/ lubricated.

Can you buy a new valve guide somewhere?


If you can't get one anywhere maybe I can make them. I have made valve guides before (reliably saw 11000+k in a ducati) and I am currently doing it now on a 931 head

I'll see if I can find my disassembled wastegate today (the one where the previous owner used high temp silicon to repair the diaphragm )
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Rasta Monsta  



Joined: 12 Jul 2006
Posts: 11354
Location: PacNW

PostPosted: Sat Jan 28, 2017 2:55 am    Post subject: Reply with quote

I never found a spec, but mine was quite loose as well. Head rebuilder fabbed a guide.
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ideola  



Joined: 01 Oct 2004
Posts: 15499
Location: Woodstock IL

PostPosted: Sat Jan 28, 2017 3:18 am    Post subject: Re: Wastegate valve guide play Reply with quote

Mike9311 wrote:
If you can't get one anywhere maybe I can make them.

I would love to be able to offer these as part of my rebuild kit. What do we need to do to make this happen?
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Rasta Monsta  



Joined: 12 Jul 2006
Posts: 11354
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PostPosted: Sat Jan 28, 2017 4:33 am    Post subject: Reply with quote

Take that back, looked back at an old thread and apparently spec is .003?
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Mike9311  



Joined: 14 Dec 2004
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Location: Chicago-ish

PostPosted: Sat Jan 28, 2017 4:55 am    Post subject: Re: Wastegate valve guide play Reply with quote

ideola wrote:
Mike9311 wrote:
If you can't get one anywhere maybe I can make them.

I would love to be able to offer these as part of my rebuild kit. What do we need to do to make this happen?


I'll measure everything and make one up. It would be nice to measure it before and after install so we know how the install tightens things up. Once we are all satisfied, it should be good to go.

Here is a manganese bronze valve guide I made up for a Ducati


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1980 931 ...off with the cobwebs
1982 931 Entwicklungsfahrzeug
1979 924 NA M471/M481 / ohne M650 Herausnehmbares Dach
0.5 1982 931 smashed parts car
1982 931 parts car?
1980 924 NA (R&D lightweight)
1982 931 WB wana-be GTR race car
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Mike9311  



Joined: 14 Dec 2004
Posts: 659
Location: Chicago-ish

PostPosted: Sat Jan 28, 2017 5:13 am    Post subject: Reply with quote

Found it...although I wish I would keep things together for the sake of organization


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1980 931 ...off with the cobwebs
1982 931 Entwicklungsfahrzeug
1979 924 NA M471/M481 / ohne M650 Herausnehmbares Dach
0.5 1982 931 smashed parts car
1982 931 parts car?
1980 924 NA (R&D lightweight)
1982 931 WB wana-be GTR race car
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ideola  



Joined: 01 Oct 2004
Posts: 15499
Location: Woodstock IL

PostPosted: Sat Jan 28, 2017 5:21 am    Post subject: Reply with quote

Mike, I have countless spare wastegates. Are you coming to Fourth Friday this afternoon? You can take one or two back with you for dissection and experimentation.
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Mike9311  



Joined: 14 Dec 2004
Posts: 659
Location: Chicago-ish

PostPosted: Sat Jan 28, 2017 5:38 am    Post subject: Reply with quote

ideola wrote:
Mike, I have countless spare wastegates. Are you coming to Fourth Friday this afternoon? You can take one or two back with you for dissection and experimentation.


Forth Friday? I am missing something
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1980 931 ...off with the cobwebs
1982 931 Entwicklungsfahrzeug
1979 924 NA M471/M481 / ohne M650 Herausnehmbares Dach
0.5 1982 931 smashed parts car
1982 931 parts car?
1980 924 NA (R&D lightweight)
1982 931 WB wana-be GTR race car
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ideola  



Joined: 01 Oct 2004
Posts: 15499
Location: Woodstock IL

PostPosted: Sat Jan 28, 2017 7:24 am    Post subject: Reply with quote

Mike9311 wrote:
ideola wrote:
Mike, I have countless spare wastegates. Are you coming to Fourth Friday this afternoon? You can take one or two back with you for dissection and experimentation.


Forth Friday? I am missing something


https://www.facebook.com/events/209593959503427/

Sorry, thought you were on the invite list...all day today, whenever you can arrive until 9 or maybe later
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Mike9311  



Joined: 14 Dec 2004
Posts: 659
Location: Chicago-ish

PostPosted: Sat Jan 28, 2017 8:00 am    Post subject: Reply with quote

ideola wrote:
Mike9311 wrote:
ideola wrote:
Mike, I have countless spare wastegates. Are you coming to Fourth Friday this afternoon? You can take one or two back with you for dissection and experimentation.


Forth Friday? I am missing something


https://www.facebook.com/events/209593959503427/

Sorry, thought you were on the invite list...all day today, whenever you can arrive until 9 or maybe later


Oh thats cool

I have a cold that settled in yesterday kicking my butt but this is good to know
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1980 931 ...off with the cobwebs
1982 931 Entwicklungsfahrzeug
1979 924 NA M471/M481 / ohne M650 Herausnehmbares Dach
0.5 1982 931 smashed parts car
1982 931 parts car?
1980 924 NA (R&D lightweight)
1982 931 WB wana-be GTR race car
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Rasta Monsta  



Joined: 12 Jul 2006
Posts: 11354
Location: PacNW

PostPosted: Sat Jan 28, 2017 1:55 pm    Post subject: Reply with quote

ideola wrote:
Sorry, thought you were on the invite list...


Awkward!


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Mike9311  



Joined: 14 Dec 2004
Posts: 659
Location: Chicago-ish

PostPosted: Sun Jan 29, 2017 7:18 am    Post subject: Reply with quote

Rasta Monsta wrote:
ideola wrote:
Sorry, thought you were on the invite list...


Awkward!



Not really I am on facebook only by proxy and I wasn't updated. I check every now and then and simply missed it.

I knew Dan wanted to do this but I figured in the Spring. He started early and I like the idea
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1980 931 ...off with the cobwebs
1982 931 Entwicklungsfahrzeug
1979 924 NA M471/M481 / ohne M650 Herausnehmbares Dach
0.5 1982 931 smashed parts car
1982 931 parts car?
1980 924 NA (R&D lightweight)
1982 931 WB wana-be GTR race car
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