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 Modifying exhaust from under car to side exit 
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Joined: Sat Apr 07, 2007 10:24 pm
Posts: 333
Location: Chester UK
Post Re: stress
stylussprinter wrote:
The tighter you fix the silencer the greater the stress on the manifold . Also bolt size is irrelevant -- it's the bobbins that hold the weight and they normally fail at the metal/rubber join when hung as opposed to compressed :roll:

Yes - of course they do, I thought that after posting :oops:
BUT thinking aboult how little the engine actually moves - it wants to rotate around its crank, but there's 2 beefy and stiff mounts preventing that and the result is that the whole car tries to rotate about the crank instead, so I can't see why the rubbers will perish quickly? Surely I'll get 3 or 4 years out of them????

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SSC Sylus 2.0 Dunnell Black Top Zetec weber alpha / DTA + cams, 236@fly. (aka NORMA)


Sat Feb 09, 2008 12:15 pm
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Post Re: stress
norma wrote:
stylussprinter wrote:
The tighter you fix the silencer the greater the stress on the manifold . Also bolt size is irrelevant -- it's the bobbins that hold the weight and they normally fail at the metal/rubber join when hung as opposed to compressed :roll:

Yes - of course they do, I thought that after posting :oops:
BUT thinking aboult how little the engine actually moves - it wants to rotate around its crank, but there's 2 beefy and stiff mounts preventing that and the result is that the whole car tries to rotate about the crank instead, so I can't see why the rubbers will perish quickly? Surely I'll get 3 or 4 years out of them????


Well , you've done it that way now so just wait and see :roll: It'll be simple enough to make a one fixture compressed bobbin mount ' if and when ' it fails so you might as well leave it :wink:
Only thing to watch out for will be checking the bobbins now and again as they're hung so if they do come apart the complete manifold plus exhaust weight will be on the manifold bolts/threads :roll: Mine will stay on top and be supported even when the rubber goes but will just vibrate on the chassis bracket to grab my attention :wink:

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I just love the Stylus but she keeps swallowing £££ !
[b]Alfa Red 159 2.4 jtdm ti 260bhp 365lbft / BilsteinB12 + Adjustable Powerflex camber/castor bushes. Red STYLUS 2lt zetec 231bhp 185lbft Dunnell . RED 1972 Alfa 2lt GTAm replica 170bhp.


Sat Feb 09, 2008 1:29 pm
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Post 
Yep - good point. I will have to carry around a bit of wire just in case! :shock:

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SSC Sylus 2.0 Dunnell Black Top Zetec weber alpha / DTA + cams, 236@fly. (aka NORMA)


Sat Feb 09, 2008 6:04 pm
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Post 
I have now decked out my inner wing to look like the inside of the Challenger space craft .... :lol:
Image

Image

next job - cut and fab 4-1 collector.......

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SSC Sylus 2.0 Dunnell Black Top Zetec weber alpha / DTA + cams, 236@fly. (aka NORMA)


Sat Feb 09, 2008 8:59 pm
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Location: Bristol
Post Bobbins
The bobbin on my exhaust failed even though it was mounted correctly(compressed), it lasted two days :shock:

Phil
:D

Stylus lead buried in garage with no enthusiasm what so ever to sort it :roll:

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Sun Feb 10, 2008 11:44 am
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Post bobbin
I've had the same one for 4 years :wink: Perhaps it was under tension sideways :?: did you have to push it across towards the chassis to get it in the hole :?:

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I just love the Stylus but she keeps swallowing £££ !
[b]Alfa Red 159 2.4 jtdm ti 260bhp 365lbft / BilsteinB12 + Adjustable Powerflex camber/castor bushes. Red STYLUS 2lt zetec 231bhp 185lbft Dunnell . RED 1972 Alfa 2lt GTAm replica 170bhp.


Sun Feb 10, 2008 11:50 am
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Location: Bristol
Post Re: bobbin
stylussprinter wrote:
I've had the same one for 4 years :wink: Perhaps it was under tension sideways :?: did you have to push it across towards the chassis to get it in the hole :?:


When i picked it up from Nathan there was an annoying rattle from the exhaust so i stuck my head in behind the wheel and couldn't see a problem, it was only when i took the wheel off i noticed the bobbin had sheared at the joint, the exhaust would quite happily sit on top of the bobbin but for some reason it just sheared off again :?

Phil
:D

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Sun Feb 10, 2008 12:55 pm
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Post Re: Modifying exhaust from under car to side exit
After a long delay (which was mostly caused by having to fit a new bathroom) I have a 4-1 collector with 1 7/8" in and 2.5" out.
I also have 6x180 deg mandrel bends in 2" and 6m of tube in 1 7/8".

This has been done as the 1 7/8" is an interferance fit into the 2" bends, therefore I can fabricate the whole primaries section without touching a welder, then when I'm happy, I'll file off the blunt edges of the 2" bends (for flow) and get the whole lot welded up. :mrgreen:

Watch this space..... :shock:

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SSC Sylus 2.0 Dunnell Black Top Zetec weber alpha / DTA + cams, 236@fly. (aka NORMA)


Fri Apr 11, 2008 10:00 pm
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Post Re: Modifying exhaust from under car to side exit
Collector viewed from 2.5" end


Attachments:
zorst april01.JPG
zorst april01.JPG [ 101.42 KiB | Viewed 2879 times ]

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SSC Sylus 2.0 Dunnell Black Top Zetec weber alpha / DTA + cams, 236@fly. (aka NORMA)
Sat Apr 12, 2008 7:18 pm
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Post Re: Modifying exhaust from under car to side exit
Trial assembly - not much room for the pipe bends :(


Attachments:
zorst april02.JPG
zorst april02.JPG [ 118.8 KiB | Viewed 2889 times ]

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SSC Sylus 2.0 Dunnell Black Top Zetec weber alpha / DTA + cams, 236@fly. (aka NORMA)
Sat Apr 12, 2008 7:19 pm
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Post Re: Modifying exhaust from under car to side exit
My collector's at least half that length . It just means you'll need some nice looping curves to lose the length on the closest pipes :wink:

_________________
I just love the Stylus but she keeps swallowing £££ !
[b]Alfa Red 159 2.4 jtdm ti 260bhp 365lbft / BilsteinB12 + Adjustable Powerflex camber/castor bushes. Red STYLUS 2lt zetec 231bhp 185lbft Dunnell . RED 1972 Alfa 2lt GTAm replica 170bhp.


Sat Apr 12, 2008 10:22 pm
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Post Re: Modifying exhaust from under car to side exit
Damn right I will! :lol:

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SSC Sylus 2.0 Dunnell Black Top Zetec weber alpha / DTA + cams, 236@fly. (aka NORMA)


Sun Apr 13, 2008 11:44 am
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Post Re: Modifying exhaust from under car to side exit
After first run, I found exhaust to be too loud and boomy so i ordered some Basalt (Thanks Rob) I've just removed the roll of rammed in glass which was doing exactly fook all, and replace with lurvely basalt - difference is amazing, no more booming and much quieter - car now totally ready for Laon - yipee! :mrgreen:

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SSC Sylus 2.0 Dunnell Black Top Zetec weber alpha / DTA + cams, 236@fly. (aka NORMA)


Sat May 24, 2008 9:47 pm
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Post Re: Modifying exhaust from under car to side exit
UPDATE:
2 years, 5000 miles & 3 track days later, exhaust bobbins are still hanging on nicely - contrary to stylus sprinter's predictions 8)


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IMG00044.jpg
IMG00044.jpg [ 425.92 KiB | Viewed 2895 times ]

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SSC Sylus 2.0 Dunnell Black Top Zetec weber alpha / DTA + cams, 236@fly. (aka NORMA)
Sat May 16, 2009 10:25 pm
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Post Re: Modifying exhaust from under car to side exit
You're a lucky chap :oops: they are designed to be compressed because it's purely the rubber being glued/vulcanised to the metal plates , taking the weight :roll:

_________________
I just love the Stylus but she keeps swallowing £££ !
[b]Alfa Red 159 2.4 jtdm ti 260bhp 365lbft / BilsteinB12 + Adjustable Powerflex camber/castor bushes. Red STYLUS 2lt zetec 231bhp 185lbft Dunnell . RED 1972 Alfa 2lt GTAm replica 170bhp.


Sat May 16, 2009 10:37 pm
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