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knobby
Joined: 23 May 2011 Posts: 43 Location: Cincinnati,Ohio
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Posted: Fri Oct 26, 2018 8:34 am Post subject: Turbo bypass valve |
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I just got my turbo back from Majestic and have to replace the bypass valve gaskets myself because they thought that they were NLA!
Anyway I need help with the piston orientation.
I think the piston crown faces the opposite side to the vacuum elbo.
There are two slots on the crown and I need to know if they need to be oriented in a specific way or doesn’t matter.
Also a slot cast that is visible from the underside of the piston.
Any help appreciated as I’d really like to get this right before installing it this weekend. _________________ 81 RED 931 S2(daily driver),81 WHITE 931 S2(not currently drivable).
Cincinnati,Ohio |
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924RACR
Joined: 29 Jul 2001 Posts: 8803 Location: Royal Oak, MI, USA
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Posted: Fri Oct 26, 2018 9:46 pm Post subject: |
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Per the parts manual, the piston looks to be installed with the flat face opposite the inlet elbow (boost sensing line from intake), or facing the RHS of the car... and the spring on the LHS of the car/on the vacuum elbow side... make sense? Sounds like what you were expecting for orientation.
Can't offer any ideas regarding rotational orientation, sorry.
Definitely want to get that sorted now; I made the mistake of getting it backwards, and had to fix in-car, which sucked (but was just barely doable)... _________________ Vaughan Scott
Webmeister
'79 924 #77 SCCA H Prod racecar
'82 931 Plat. Silver
#25 Hidari Firefly P2 sports prototype |
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Carrera RSR
Joined: 08 Jan 2010 Posts: 2309 Location: Somerset, UK
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Posted: Sun Oct 28, 2018 12:15 am Post subject: |
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Not aware of orientation of the slots. I don’t believe it matters. Had mine in and out twice and did not consider this. There is nothing to stop the piston spinning except spring friction anyhow. _________________ 1980 931 - forged pistons, Piper cam, K27/26 3257 6.10 hybrid turbo, 951 FMIC, custom intake, Mittelmotor dizzy & cam pulley, H&S exhaust, GAZ Gold, Fuch'ed, Quaife
Now www.924board.org/viewtopic.php?t=34690
Then www.924board.org/viewtopic.php?t=31252 |
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knobby
Joined: 23 May 2011 Posts: 43 Location: Cincinnati,Ohio
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Posted: Mon Oct 29, 2018 1:02 pm Post subject: |
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I eventually spoke to the tech at Majestic who confirmed that the rotational orientation of the piston slots was vertical when he disassembled the turbo but John stated that it did not matter.
Any way I installed it this weekend and am very happy with it!
Thanks for your replies,much appreciated! _________________ 81 RED 931 S2(daily driver),81 WHITE 931 S2(not currently drivable).
Cincinnati,Ohio |
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