ajh Posted June 1, 2014 Share Posted June 1, 2014 One of the things I found when I drove for a while in hot weather with my bonnet off was that the airflow through the flaps decreased dramatically; and in +40C that's a bit of a problem, what I'm wondering is if fitting the Puma bonnet has any similar effect to the airflow or not since the old style one seems designed to maximize air pressure right at the key point. Quote Link to comment Share on other sites More sharing options...
western Posted June 1, 2014 Share Posted June 1, 2014 the newest defenders don't have the bulkhead vents as the dash is totally different, the bonnet bulge ends before the bulkhead, doubt you'll notice any difference in airflow through the vents. Quote Link to comment Share on other sites More sharing options...
ajh Posted June 1, 2014 Author Share Posted June 1, 2014 Yes, those things are obvious. However airflow is a complex fluid dynamics problem and not something where guessing and common sense are effective in predicting; hence 3d modeling, wind tunnels, etc. I'd like to hear at least anecdotal evidence before making a decision on what to do about my damaged bonnet. Quote Link to comment Share on other sites More sharing options...
CwazyWabbit Posted June 1, 2014 Share Posted June 1, 2014 There are a few people who have fitted Puma bonnets to older landies, I think Landy-Novice on here has ( not sure if his 110 has been put on the road yet though) so hopefully one of them will comment on this thread for you. Oh and I believe Ash Witty has done it as well and his is definitely on the road. Quote Link to comment Share on other sites More sharing options...
Ash.Witty Posted June 1, 2014 Share Posted June 1, 2014 I have changed my bonnet for the later puma bonnet type as I carried out an engine conversion and the turbocharger was about four inches too high for the original. I have noticed no difference at all in regards to the airflow flowing through the flaps when out driving. 1 Quote Link to comment Share on other sites More sharing options...
ajh Posted June 1, 2014 Author Share Posted June 1, 2014 Excellent; so one of the fibreglass ones is an option then. Thanks! Quote Link to comment Share on other sites More sharing options...
Landy-Novice Posted June 1, 2014 Share Posted June 1, 2014 There are a few people who have fitted Puma bonnets to older landies, I think Landy-Novice on here has ( not sure if his 110 has been put on the road yet though) don't look at me! my 110 isn't going to see the road for a few years, atleast!! Quote Link to comment Share on other sites More sharing options...
CwazyWabbit Posted June 1, 2014 Share Posted June 1, 2014 don't look at me! my 110 isn't going to see the road for a few years, atleast!! Lol What's the hitch? Quote Link to comment Share on other sites More sharing options...
landroversforever Posted June 1, 2014 Share Posted June 1, 2014 Lol What's the hitch? I would imagine its either a NATO or a conventional ball... or both 2 Quote Link to comment Share on other sites More sharing options...
CwazyWabbit Posted June 1, 2014 Share Posted June 1, 2014 I was betting on a ball and pin Watch it or I'll ask how your build is going! 1 Quote Link to comment Share on other sites More sharing options...
landroversforever Posted June 1, 2014 Share Posted June 1, 2014 I'm just writing an update now 1 Quote Link to comment Share on other sites More sharing options...
Landy-Novice Posted June 1, 2014 Share Posted June 1, 2014 I would imagine its either a NATO or a conventional ball... or both haha!! Lol What's the hitch? Money. or lack of it! Quote Link to comment Share on other sites More sharing options...
Snagger Posted June 2, 2014 Share Posted June 2, 2014 I can't say I've noticed a major change in vent effectiveness whether I have my bonnet mounted spare wheel fitted or not, and that must disrupt airflow more than the humped late bonnet. It does have an effect on the windscreen washer jets, though. Quote Link to comment Share on other sites More sharing options...
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