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Old 01-03-2009, 08:07 PM   #25 (permalink)
EcoModding Lurker
Join Date: Jul 2008
Location: Auckland, New Zealand
Posts: 34

Novaz_M35 - '02 Nissan Stagea 250 RX
90 day: 21.7 mpg (US)
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For those wondering about lifting the rear of the bonnet/hood with spacers - I tried this on a 3rd Gen RX7. The heat generated in the engine bay is massive, so any extra cooling is helpful.
I was fortunate enough to see where the heat was spilling out in the mornings when the bonnet was iced up.

The raised edges cleared first along the whole length of the bonnet, the de-iced strip being perhaps 2" wide from the edge. The next area to de-ice was directly above the turbos, followed by a criss-cross pattern that marked the underbonnet reinforcing. The *last* area to thaw was the very rear edge of the bonnet. It seemed that very little hot air was expelled from here.

I thought about raising the bonnet in a similar fashion on the Laurel to smooth the transition to the windscreen, however it looks like the turbulence generated by the raised edges might counteract this effort.

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