Si bonnet bulge ... am I pleased to see you or do I have an XU5M3/Z in my pocket?
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Thread: Si bonnet bulge ... am I pleased to see you or do I have an XU5M3/Z in my pocket?

  1. #1
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    Default Si bonnet bulge ... am I pleased to see you or do I have an XU5M3/Z in my pocket?

    Hi, I was wondering about the bonnet bulge associated with the Si model.

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    Do I presume this is because the Magnetti-Marelli SPI injection unit is taller than a 'regular' engine carbs/MPI so it needed the extra head room?

    I note the Euro Automatics also have the 'bulge', but these also tend to have the same SPI engine.

    'Interestingly', early Spanish 205s also had the same bonnet bulge due to them using the Poissy engines which I presume were also taller than the Douvrin and later TU/XU donks.

    griffo

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    Fellow Frogger! lozenge's Avatar
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    you're right, the Si injection setup needs that extra bit of space.
    of course it looks good too...

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    Fellow Frogger! EvilElmo's Avatar
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    Gotta have the bonnet bulge!

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    Auto has a carby but still needs the bulge.
    Looks good from the side but not so good from the front, gives a high and narrow look.

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    Quote Originally Posted by GRAHAM WALLIS View Post
    but not so good from the front, gives a high and narrow look.
    *Gasp!* (Clutches fake pearls).

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    1000+ Posts 504-504-504's Avatar
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    Quote Originally Posted by GRAHAM WALLIS View Post
    Auto has a carby but still needs the bulge.
    Looks good from the side but not so good from the front, gives a high and narrow look.
    Three 205 Si Autos in the back yard here all with fuel injection.

    Red, silver/grey and white. Keeping a dark grey manual company and all supervised by a grey/blue 205 GTi/Mi16.

    Paul
    lozenge likes this.

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    Tadpole s_ikari2015's Avatar
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    I think it's funny it has the bonnet bulge, and then you open the bonnet and the bulge is almost entirely filled with insulation.
    1992 Peugeot 205 Auto (SI)
    1983 Subaru Sherpa
    2002 Holden CV8 Monaro

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    Talking of the Euro spec auto.
    No bonnet insulation on Sis, just the GTis have this.

    Quote Originally Posted by 504-504-504 View Post
    Three 205 Si Autos in the back yard here all with fuel injection.

    Red, silver/grey and white. Keeping a dark grey manual company and all supervised by a grey/blue 205 GTi/Mi16.

    Paul

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    Quote Originally Posted by GRAHAM WALLIS View Post
    Auto has a carby but still needs the bulge.
    Looks good from the side but not so good from the front, gives a high and narrow look.
    Yes, it seems the Weber 36TLC that was used in the XU51C engined Autos also had a high profile which required the bonnet bulge.

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    Fellow Frogger! EvilElmo's Avatar
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    The bracing they cut out was kind of necessary as well, the centre of my bonnet is sooo flimsy...

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    Quote Originally Posted by ng850 View Post
    Yes, it seems the Weber 36TLC that was used in the XU51C engined Autos also had a high profile which required the bonnet bulge.
    For reference this what the engine bay of a Euro Automatic with the carburettor XU51C looks like.

    Si bonnet bulge ... am I pleased to see you or do I have an XU5M3/Z in my pocket?-auto-carb.jpg

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    Tadpole s_ikari2015's Avatar
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    Quote Originally Posted by GRAHAM WALLIS View Post
    Talking of the Euro spec auto.
    No bonnet insulation on Sis, just the GTis have this.
    So someone put a GTI bonnet on my SI? Then put the original SI tuning sticker on it. Or perhaps they just stuck the insulation on the bonnet.

    Si bonnet bulge ... am I pleased to see you or do I have an XU5M3/Z in my pocket?-img_20160216_180717.jpgSi bonnet bulge ... am I pleased to see you or do I have an XU5M3/Z in my pocket?-img_20160216_180753.jpg
    1992 Peugeot 205 Auto (SI)
    1983 Subaru Sherpa
    2002 Holden CV8 Monaro

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    Fellow Frogger! EvilElmo's Avatar
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    Slightly odd?

    ...Shouldn't you be using the green coolant?

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    Tadpole s_ikari2015's Avatar
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    1992 Peugeot 205 Auto (SI)
    1983 Subaru Sherpa
    2002 Holden CV8 Monaro

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    Quote Originally Posted by s_ikari2015 View Post

    I only looked into this when I got my 205. My understanding was - brown/red = antifreeze/antiboil.
    green = antifreeze/antiboil + corosion inhibitors. That's what I thought anyway,

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    Quote Originally Posted by EvilElmo View Post
    I only looked into this when I got my 205. My understanding was - brown/red = antifreeze/antiboil.
    green = antifreeze/antiboil + corosion inhibitors. That's what I thought anyway,
    FWIW, when I replaced my stuffed original radiator in my GTi with a Hella aluminium/plastic unit I changed to Nulon Red OAT product as this is recommended for use with aluminium rads.

    One thing I found is it's a bit more 'slippy' than the generic green coolant, so any minor leaks in your system will become more obvious.

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    Fellow Frogger! le frogg 205's Avatar
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    can confirm my bulge is quite flaccid. and no insulation either. great for the revs

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