Why a steel bonnet

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Why a steel bonnet

Post by Thread Bear »

Why does a TZD 1.9 have a steel bonnet and most of the rest have plastic? Is it to have more mass to attempt to quieten the engine noise down? Seems rather illogical otherwise.
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Re: Why a steel bonnet

Post by Stinkwheel »

Our new (to us) K plate 16TXi has a steel bonnet also, ive never been quite sure which ones did and didnt have plastic or steel, or why even?
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Re: Why a steel bonnet

Post by mat_fenwick »

Why does a TZD 1.9 have a steel bonnet and most of the rest have plastic?
It's not as clear-cut as that; it seems to be that very early and late cars sometimes had steel bonnets, although at this age who knows what's been swapped around over the years? Plus it's possible that it was cheaper for aftermarket panel suppliers to make pattern steel bonnets rather than tool up to mould them from plastic, so a steel bonnet may signify it's been replaced at some point.

It's been suggested that diesels are more likely to have the steel bonnet to help noise reduction, but not sure whether that's a fact or just a coincidence.
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Re: Why a steel bonnet

Post by Tim Leech »

Mk1 Diesels had Steel Bonnets and the very last ones aswell, the steel bonnet does seem to insulate the diesel clatter better!
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Re: Why a steel bonnet

Post by Defender110 »

We've come to the conclusion in the past that there is not set pattern for this; I've had at least 6 varying diesel BX's with most variants from nearly new to now and none of them have had a metal bonnet, the only metal bonnet I have personally ever seen was on Matthews (Mulley) TXD, I recall being shocked how heavy it was to lift.
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Re: Why a steel bonnet

Post by Stinkwheel »

So can anyone explain the TXi's petrol model steel bonnet?

Doesnt look pattern and the car looks original at the front end. (i.e. no evidence of accident damage)
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Re: Why a steel bonnet

Post by mat_fenwick »

More discussion here...with the only logical conclusion reached by Doc.
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Re: Why a steel bonnet

Post by Stinkwheel »

mat_fenwick wrote:More discussion here...with the only logical conclusion reached by Doc.

Excellent thanks Mat.

I have to agree with Doc's summing up!!!
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Re: Why a steel bonnet

Post by BX Bandit »

Doc eh? Bloody genius. Never seen a metal short nose though
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Re: Why a steel bonnet

Post by Tinkley »

Of my 2 Athenas, one has a short nose GRP and the other steel. Ones Jan 91 the other Mar 91. My own personal guess is to do with an extra EU regulation on RF etc from the HT leads and alternator 'noise'. Usually if you can create a Faraday cage around the offending item it will then be 'quiet' when testing for interference.

The radiator trim flap is different and the grille also to suit either shape bonnet. To me the steel one is definitely heavier to lift from the front but when you take the whole thing off its not so much heavier. In fact the steel one is still loose as I haven't reattached it as the hinges are bent, but having had both off recently I was surprised it wasn't heavier.

You could always try an aluminium variant to see if it would pass the current crash tests!

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Re: Why a steel bonnet

Post by ghaddon1701 »

My K reg GTi has a steel bonnet. With the sound deadening attached to the underside. My old 14 had a plastic bonnet with no sound deadening just a strange metal mesh.

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Re: Why a steel bonnet

Post by citsncycles »

My 14 had the same thing - I guess it's to do with the RF interference, as it had an earth strap on it.
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Re: Why a steel bonnet

Post by Defender110 »

Can't believe I just read that previous thread again for the definitive answer again :oops:
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Re: Why a steel bonnet

Post by Mothman »

Tim Leech wrote:Mk1 Diesels had Steel Bonnets and the very last ones aswell, the steel bonnet does seem to insulate the diesel clatter better!
Gloria, a MK 1 diesel, has a plastic bonnet.

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Re: Why a steel bonnet

Post by Tim Leech »

Mothman wrote:
Tim Leech wrote:Mk1 Diesels had Steel Bonnets and the very last ones aswell, the steel bonnet does seem to insulate the diesel clatter better!
Gloria, a MK 1 diesel, has a plastic bonnet.

Andy
It's an auto so has a short nosed one hence why its plastic.
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