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  Author    exhaust---> bulkhead, how much space needed?  (currently 1,752 views)
Olivier Bos
Posted on: July 24th, 2007, 11:10:34
Attachment: marcos_7170_062kl.jpg - 100.31 KB (1504 views)
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I've almost finished the speed-build of my Marcos, but don't know how much space is needed between the exhaustmanifold and the bulkhead?

It's a MK3, I've got a Sportex exhaustmanifold.

There is a space of 1,5-2 millimeter between them..

Is this a problem and is it gonna catch fire or something??

I hope to sort this, as I'm gonna leave for IMM Denmark in 2 days!

cheers, Oliver

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Allan Brown
Posted on: July 24th, 2007, 19:00:36 Quote Report to Moderator
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Unless your engine is solid mounted the manifold will probably hit the bulkhead when you rev the engine. Which will either be very annoying or brake the manifold. It might be worth extending the top engine steady bar or fit an ultimate engine steady that you can adjust to the right length.
You could insulate the bulkhead with a plumbers soldering mat which plumbers use to protect the wall when soldering pipes together.

Good luck with the build it is looking good so far.

Allan
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Tertius van Zyl
Posted on: July 24th, 2007, 20:25:19 Quote Report to Moderator
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Mine got so hot that it singed the carpet underfelt on the INSIDE of the car! - and the manifold was further away than 2mm's. I fitted a thin metal heatshield with that non asbestos type silver foil that the racing guys use, glued onto it on the engine bulkhead side. It seems to work well. I am aware that some of you guys don't appreciate this...but I also wrapped the upper branches of the manifold with heat tape. Sorry!!!
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Graham Bichard
Posted on: January 28th, 2010, 11:45:02 Quote Report to Moderator
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2 1/2 years - is that a thread resurrection record?
Oliver - do you have a rear view of this car?  It looks to have a neat rear spoiler fitted.
Oh, and it looks good on Sportspack alloys too!
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admin
Posted on: January 28th, 2010, 15:09:35 Quote Report to Moderator
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See

http://www.minimarcos.org.uk/memcars/7170/
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Matthew Payne
Posted on: April 23rd, 2010, 22:04:32 Quote Report to Moderator
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Sorry to drag this up again, but I fitted my exhaust manifold tonight, and just wanted people opinions on the clearance I have:



Cheers

Matthew
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Neil KilBane
Posted on: April 24th, 2010, 07:33:21 Quote Report to Moderator
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just a little fine tuning left to do.


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Matthew, I would go with what Tertius has done in his post, exhaust wrap and heat shield the bulkhead.

 
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Graham Bichard
Posted on: April 24th, 2010, 07:35:28 Quote Report to Moderator
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Matthew - what make of manifold is that?  It looks to be stainless.  If so I can't see of any problem in putting exhaust wrap on it, as Tertius mentions.  Is the subframe solidly mounted (poly/alloy bushes)?
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Matthew Payne
Posted on: April 24th, 2010, 09:21:02 Quote Report to Moderator
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Quoted from Neil KilBane, posted April 24th, 2010, 07:33:21 at here
Matthew, I would go with what Tertius has done in his post, exhaust wrap and heat shield the bulkhead.



Now that Ive fitted it, I didnt really wanna take the exhaust off again to wrap it! I'll certainly look into the heat shield though.
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Matthew Payne
Posted on: April 24th, 2010, 09:23:38 Quote Report to Moderator
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Quoted from Graham Bichard, posted April 24th, 2010, 07:35:28 at here
Matthew - what make of manifold is that?  It looks to be stainless.  If so I can't see of any problem in putting exhaust wrap on it, as Tertius mentions.  Is the subframe solidly mounted (poly/alloy bushes)?



The exhaust is Specialist Components Stainless one.

The subframe is solidly mounted-its an early one. The engine then uses a (slightly modified) DSN Retro Sport semi-rosejointed upper steady, and left and right Minispares lower steadies... It shouldn't move a lot!  

Last modified April 24th, 2010, 09:25:19 by Matthew Payne
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Graham Bichard
Posted on: April 24th, 2010, 19:11:34 Quote Report to Moderator
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Hmm, I've looked at these SC manifolds - is it good quality/fit?  And is this the one with two lambda sensor bosses?
I'd have to say for the effort of removing the lcb to wrap it would have to be worth it though!  And perhaps look at turbominis.co.uk for details on heat shielding, which could be stuck to the bulkhead when the manifold is out?

ETA Do you have a link to the DSN steady?

Last modified April 24th, 2010, 19:12:39 by Graham Bichard
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Wil Ker
Posted on: April 24th, 2010, 19:45:14 Quote Report to Moderator
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That manifold is cleary on a Twink head, not just an SC LCB!.
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Matthew Payne
Posted on: April 24th, 2010, 20:17:44 Quote Report to Moderator
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Wil... Top Marks!

Graham... Effort?! It would be a real task! To get it in, I had to remove the front right driveshaft inner pot - Which to get to, I had to take the right front suspension apart! If the heat shield will do, I'd rather just do that!

All SC stuff Ive had is top quality... personally I would have no hesitation trying their LCB. And phone John or Simon up regards the lambda boss...

Oh, and the engine steady is listed on here somewhere!
http://www.dsnclassics.co.uk/acatalog/DSN_Classics_Billet_Alloy_Parts_33.html
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chris clarke
Posted on: April 25th, 2010, 19:50:37 Quote Report to Moderator
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I've just fitted a sc stainless manifold on my mk 3 and wrapped it and can still get my fingers between manifold and bulk head, I have dsn retro sport adjustable engine steady (I had to have one really,my son works for dsn and makes all the retro sport parts).
Manifold is good quality is was a shame to cover it but i needed to reduce under bonnet temp.
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Matthew Payne
Posted on: April 25th, 2010, 23:09:50 Quote Report to Moderator
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Quoted from chris clarke, posted April 25th, 2010, 19:50:37 at here
I've just fitted a sc stainless manifold on my mk 3 and wrapped it and can still get my fingers between manifold and bulk head, I have dsn retro sport adjustable engine steady (I had to have one really,my son works for dsn and makes all the retro sport parts).
Manifold is good quality is was a shame to cover it but i needed to reduce under bonnet temp.



I remember seeing the steady at last years Fakenham Mini Show. I made a point in my mind that having seen it there for the last 2 years, I would have mine ready in time for this years show... Oh well, thats out the window now!  
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