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Turbo Drain Design Input (gauge)

 
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Mike9311  



Joined: 14 Dec 2004
Posts: 874
Location: Chicago-ish

PostPosted: Sun Mar 22, 2020 12:58 am    Post subject: Turbo Drain Design Input (gauge) Reply with quote

Hi All

Just wanted to get input on a 'not so important' side project besides tooling up for Morghen's 2470 wheel which I hope to do very soon before this project. Especially now that the hard deadline for the '82 has been delayed for obvious reasons. No joy rides here due to lock-down (back and forth to work however is still on table so far).

Been thinking of adding a temp gauge port to the turbo drain. Obviously the thread could be metric or inch.

Thoughts?

The last pic has me doing virtual test machining and you can see the boss for the sensor there. I likely would need to finish old school by hand since machining is somewhat difficult for the internals.










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1980 931 since 1989
1981 Ideola 931 Club Sport
1982 931 Entwicklungsfahrzeug
1979 924 NA M650 Herausnehmbares Dach
1982 931 Red Resurrection - 951 IC
1982 931 parts car / resurrection?
1980 924 NA (R&D lightweight)
1982 931 wana-be GTR race car
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924RACR  



Joined: 29 Jul 2001
Posts: 8334
Location: Royal Oak, MI, USA

PostPosted: Sun Mar 22, 2020 1:55 am    Post subject: Reply with quote

Interesting idea.

I'd want to make sure the boss is long enough that the probe doesn't stick too far into the flow and restrict it. I've seen some gauge adapters that aren't long enough and I've had to create extra spacers, particularly with the VDO temp senders, to get the probe out of the flow. Some would even go in so far as to touch the other wall of the tube, almost completely blocking the flow!

May also be worth verifying that the body (OD) of the sender will clear the turbo itself, housings, fasteners etc on installation. As that sits, it looks pretty close.
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Mike9311  



Joined: 14 Dec 2004
Posts: 874
Location: Chicago-ish

PostPosted: Sun Mar 22, 2020 3:00 am    Post subject: Reply with quote

924RACR wrote:
Interesting idea.

I'd want to make sure the boss is long enough that the probe doesn't stick too far into the flow and restrict it. I've seen some gauge adapters that aren't long enough and I've had to create extra spacers, particularly with the VDO temp senders, to get the probe out of the flow. Some would even go in so far as to touch the other wall of the tube, almost completely blocking the flow!

May also be worth verifying that the body (OD) of the sender will clear the turbo itself, housings, fasteners etc on installation. As that sits, it looks pretty close.


Agreed on the sticking out of the sensor especially the one I have now. Its something like 1.7" after the thread. (IGNORE The note that says wastegate. Mental typo there.)

From what we see so far is the car body could be the issue. I would like if it would be in a pocket to the side enveloped in oil but not in the general flow area. However this could be great for the sender I show but maybe not for others.


_________________
1980 931 since 1989
1981 Ideola 931 Club Sport
1982 931 Entwicklungsfahrzeug
1979 924 NA M650 Herausnehmbares Dach
1982 931 Red Resurrection - 951 IC
1982 931 parts car / resurrection?
1980 924 NA (R&D lightweight)
1982 931 wana-be GTR race car
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