The Roaring Season

MMmmmm John thats a good idea ....lol

In regard bonnets I guess you have spotted the photos from the UK in the "Just a mix.." thread?

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The old story of Holden bonnet hinges flogging out where the rivets go through and the spring pushes it up, cheap fix is to slot mounting holes a wee bit on the inner guard mount points so it can sit down more, or of course drill out rivets and build up with weld re-drill and re-rivet, bit of a job but probably worth the effort. Great Job John, so love seeing these old girls being Re Born!

Nathan Wood wrote:The old story of Holden bonnet hinges flogging out where the rivets go through and the spring pushes it up, cheap fix is to slot mounting holes a wee bit on the inner guard mount points so it can sit down more, or of course drill out rivets and build up with weld re-drill and re-rivet, bit of a job but probably worth the effort. Great Job John, so love seeing these old girls being Re Born!

In the context of this discussion, it relates to the practice of having the back edge lifted on purpose to help getting the engine bay heat relieved some.

Oldfart wrote:In the context of this discussion, it relates to the practice of having the back edge lifted on purpose to help getting the engine bay heat relieved some.

That old myth again? do people still think it works?

Myth is correct, wind tunnel tests over the years have well and truly put that one to bed, but there are a lot of non believers out there who will swear on their grandmothers grave that it works and that they have to do that to get the engine temp down, and I have found over the years, that most of those don't understand why the damm thing gets hot in the first place!
Roger

Racer Rog wrote:Myth is correct, wind tunnel tests over the years have well and truly put that one to bed, but there are a lot of non believers out there who will swear on their grandmothers grave that it works and that they have to do that to get the engine temp down, and I have found over the years, that most of those don't understand why the damm thing gets hot in the first place!
Roger

I don't want to buy into myth or not. Nathans comment which I quoted was a discussion starter about hinges. If anyone wants to quote windtunnels etc, that is fine, however unless the actual vehicle being brought into the topic has been tested the theory is invalid. And yes I have actually spent time with windtunnels. Incredibly small differences can negate previous ideas. Angle of rake of the car itself, windscreens, nose shapes all (and not exclusively) can throw all prior ideas out the window. Generalisations do not apply.

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Happy to be wrong John. Wasn't Grant referring to having to close the gap in years gone by? Some rule that MANZ came up with about fluids escaping on to screens?

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928 wrote:That old myth again? do people still think it works?

Don't think, know it works, did it years back. Sorry Rog.

Did it with Anglia (2Ltr) years ago and added a little lip on front of rear gap to assist. it certainly helped with flow of air through engine bay.

PS me and Mr Sprague discussed this on another thread last year with photos.

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New Corvette wheel, Holden used them on HK Monaro , brand new off evilbay for $165, New wheel hub from rare spares.. Dash colour is the original

off to start prep for paint work John.....the underside ??, Cheers Bruce

Yeeha John

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Just a question John, are you allowed to race with that beautiful wood rim wheel ?. From memory they were the same as what I had in my 68 Vette.
My Alfa 105 came with a Personel wood rim wheel and I had to replace it.....sold it to a guy restoring his 105 and regret it ever since.

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Its the lip that most likely,did the trick as just raising it by it self often causes a vacuum, and also m,as the old fella said rake, screen angle would make a difference, but rule of thumb it doesn't work, unless youy doing other work in conjunction with it.

Rod Grimwood wrote:Don't think, know it works, did it years back. Sorry Rog.

Did it with Anglia (2Ltr) years ago and added a little lip on front of rear gap to assist. it certainly helped with flow of air through engine bay.

PS me and Mr Sprague discussed this on another thread last year with photos.

You right about the lip Rog. We did a little bit of playing around back then to try and sort out air etc. and when we put the little alloy lip across front of vent at same angle as windscreen and slightly enlargened the gap it made a difference, cheers