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PostPosted: Fri Mar 15, 2013 8:41 pm 
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Joined: Sun Apr 29, 2012 4:23 pm
Posts: 90
Car Model: None
Has anyone done this? We all know the cambelt bonnet vent is blocked off on the cambelt cover from the factory and is largely pointless anyway, but a bit of airflow between the chargecooler and cam cover would be of great benefit in the war against unwanted heat soak. I was thinking about cutting the side of the small rubber duct on the engine, and making up some ducting to feed air under the CC. In addition adding a coarse wire gauze onto the vent exit on the underside of the bonnet would prevent any stray rain drops causing any problems to the plugs/leads, but the way in which the OEM ducting is designed I don't think this would be a problem anyway.

Even with my thick ThermoGuard lagging there is adequate space between the CC and head for this to be of some benefit.

It would be nice to put that little vent to some use :lol:


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PostPosted: Fri Mar 15, 2013 10:44 pm 
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Club Staff
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Joined: Wed Jul 13, 2005 12:14 am
Posts: 3265
Location: Camberley, Surrey
Car Model: ST205
I have thought about it before but never got round to sorting anything out. I'm sure it wouldn't hurt. :)

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PostPosted: Sat Mar 16, 2013 12:57 am 
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Joined: Wed Jul 13, 2005 12:06 am
Posts: 4743
Location: Perth, Western Australia
Car Model: ST205
The bonnet scoop is quite small so I wouldn't expect it to deliver much in the way of cooling air to the space between the cam cover and the WTA intercooler. As Mike says, its probably worth doing but how much difference it will make is anyones guess. I have previously used an aluminised infra red insulator on the bottom and sides of my WTA intercooler but will probably use the new Zircoflex ceramic sheet on my JDM as this is supposed to give good protection against heat soak and radiant heat.

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1994 Toyota Celica GT-Four ST205WRC JDM 269bhp @ 0.9bar
1994 Toyota Celica GT-Four Special GT 590bhp @ 1.8bar
1989 Van Diemen RF88/89 Formula Ford 1600
2008 Nissan Patrol GU 3.0L ZD30DDTi 154bhp


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