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Author Topic: Plenum Bolts Torque  (Read 5973 times)

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amba

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Plenum Bolts Torque
« on: 27 October 2011, 12:59:44 »
Can somebody just confirm the torque for the 4 plenum bolts :y

Think its 20nm but just want to check :)
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JamesV6CDX

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Re: Plenum Bolts Torque
« Reply #1 on: 27 October 2011, 13:00:34 »
I have 8nm in my head...
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aaronjb

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Re: Plenum Bolts Torque
« Reply #2 on: 27 October 2011, 13:04:44 »
Quote from: JamesV6CDX on 27 October 2011, 13:00:34
I have 8nm in my head...

For the cam covers, yeah.. but for the plenum?

20Nm, per here: http://www.omegaowners.com/forum/index.php?topic=90519.0
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JamesV6CDX

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Re: Plenum Bolts Torque
« Reply #3 on: 27 October 2011, 13:10:56 »
I can't actually see the plenum value on that list.

Where is the list sourced from?

I note it says "Oil filter housing cover to oil filter housing 25nm" - whereas we all know this value is 15nm (it's even stamped on the casing)  :y
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feeutfo

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Re: Plenum Bolts Torque
« Reply #4 on: 27 October 2011, 13:15:07 »
8nm!

I thought it was 20nm at the Aldershot meet. I was wrong, as proved by Haynes. Doh!
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feeutfo

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Re: Plenum Bolts Torque
« Reply #5 on: 27 October 2011, 13:16:36 »
Quote from: JamesV6CDX on 27 October 2011, 13:10:56
I can't actually see the plenum value on that list.

Where is the list sourced from?

I note it says "Oil filter housing cover to oil filter housing 25nm" - whereas we all know this value is 15nm (it's even stamped on the casing)  :y
sure it's 25!


...or is it 20? ;D
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feeutfo

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Re: Plenum Bolts Torque
« Reply #6 on: 27 October 2011, 13:17:49 »
Quote from: chrisgixer on 27 October 2011, 13:15:07
8nm!

I thought it was 20nm at the Aldershot meet. I was wrong, as proved by Haynes. Doh!
...although I never bother torquing, just do em up sensibly.
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Andy B

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Re: Plenum Bolts Torque
« Reply #7 on: 27 October 2011, 13:19:17 »
Quote from: chrisgixer on 27 October 2011, 13:17:49
Quote from: chrisgixer on 27 October 2011, 13:15:07
8nm!

I thought it was 20nm at the Aldershot meet. I was wrong, as proved by Haynes. Doh!
...although I never bother torquing, just do em up sensibly.

That's what I was going to say ................  ::) ::) ::)
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aaronjb

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Re: Plenum Bolts Torque
« Reply #8 on: 27 October 2011, 13:25:53 »
Quote from: JamesV6CDX on 27 October 2011, 13:10:56
I can't actually see the plenum value on that list.

Whoops you're right, I read the first of the two 'Intake ...' lines wrong  :-[

I'll get me coat.
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aaronjb

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Re: Plenum Bolts Torque
« Reply #9 on: 27 October 2011, 13:26:26 »
Quote from: chrisgixer on 27 October 2011, 13:16:36
Quote from: JamesV6CDX on 27 October 2011, 13:10:56
I can't actually see the plenum value on that list.

Where is the list sourced from?

I note it says "Oil filter housing cover to oil filter housing 25nm" - whereas we all know this value is 15nm (it's even stamped on the casing)  :y
sure it's 25!


...or is it 20? ;D

I thought it was 15..

But all I did was do mine 'up', so to speak.
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Darth Loo-knee

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Re: Plenum Bolts Torque
« Reply #10 on: 27 October 2011, 13:34:23 »
I have always tightened the Plenum Bolts to 20nm. These bolts are 8mm bolts that go into the ali inlet manifold.
The Cam Cover Bolts are tightened to 8nm which are 6mm bolts that also go into ali......

How can they be the same torque setting?
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JamesV6CDX

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Re: Plenum Bolts Torque
« Reply #11 on: 27 October 2011, 13:37:17 »
Quote from: Darth Loo-knee on 27 October 2011, 13:34:23
I have always tightened the Plenum Bolts to 20nm. These bolts are 8mm bolts that go into the ali inlet manifold.
The Cam Cover Bolts are tightened to 8nm which are 6mm bolts that also go into ali......

How can they be the same torque setting?

Because the clamping force needed to seal the plenum O-rings is  minimal :y
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Darth Loo-knee

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Re: Plenum Bolts Torque
« Reply #12 on: 27 October 2011, 13:38:53 »
Quote from: JamesV6CDX on 27 October 2011, 13:37:17
Quote from: Darth Loo-knee on 27 October 2011, 13:34:23
I have always tightened the Plenum Bolts to 20nm. These bolts are 8mm bolts that go into the ali inlet manifold.
The Cam Cover Bolts are tightened to 8nm which are 6mm bolts that also go into ali......

How can they be the same torque setting?

Because the clamping force needed to seal the plenum O-rings is  minimal :y

Why use 8mm bolts then and not 6mm?
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JamesV6CDX

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Re: Plenum Bolts Torque
« Reply #13 on: 27 October 2011, 13:43:57 »
Quote from: Darth Loo-knee on 27 October 2011, 13:38:53
Quote from: JamesV6CDX on 27 October 2011, 13:37:17
Quote from: Darth Loo-knee on 27 October 2011, 13:34:23
I have always tightened the Plenum Bolts to 20nm. These bolts are 8mm bolts that go into the ali inlet manifold.
The Cam Cover Bolts are tightened to 8nm which are 6mm bolts that also go into ali......

How can they be the same torque setting?

Because the clamping force needed to seal the plenum O-rings is  minimal :y

Why use 8mm bolts then and not 6mm?

I would guess that a slightly thicker bolt provides a more consistent clamping force across all of the inlet ports, taking into account the weight/dimensions of the plenum?
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Darth Loo-knee

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Re: Plenum Bolts Torque
« Reply #14 on: 27 October 2011, 13:47:30 »
I don't agree I'm afraid....

Bigger bolts will be a higher torque setting than a smaller bolts... else we would have 6mm bolts for Head Bolts.
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