hi everyone,

i have a set of triple webers on my 260z but they suck air from inside the engine bay. hot air.

anyways i was wondering if people have fitted custom cold air boxes to there zeds and if they have would the please be able to post pics and give me some dimensions of the box.

Cheers,

Tom.

Here's a place in the US that makes a nice box, and gives you a good idea of the dimensions you would need, although the price of this one is pretty high, you could probably make one out of aluminum for a lot less if you have the tools.

http://www.twminduction.com/airbox.htm

I knocked up a heat shield from some thin aluminium sheet a while back (keep the heat out of the carbs to help with the vapour lock problems I was having) which does a reasonable job of getting cool air flow to the carbs. I'm sure there's some hot air from the radiatior getting to them still, but there's no swirling up from around the exhaust at least.

If I shut it down and let it all heat soak for a while, to the point the carbs are quite hot to touch, 10 minutes of driving and they'll be cold to the touch again, so the air getting to them must be reasonably cool.

http://www.classiczcars.com/photopost/showphoto.php?photo=10616&sort=1&cat=3138&page=1

I noticed that your fuel lines aren't insulated datto-zed. Was it always like that or did you remove it after you put the heat shield in?

It was always like that. Insulating fuel lines was another thing on the to do list. When the new motor goes in I'll probably totally ditch the factory fuel line setup anyway. Electric fuel pump and the heat shield fixed the problem anyhow, other than on the most extreme of days.