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QUOTE(JRust @ Aug 10 2011, 11:15 PM)
QUOTE(stewteral @ Aug 10 2011, 10:32 PM)
GOOD ON YOU! Too many conversion cars have no header and thus no room for expansion when cooling water heats up. Also purging air becomes a project.
I shoved a Camaro 31" X 19" Summit radiator in the nose of my car to cool my built 383. It works, with big fans for 100 deg.+ heat at Willow Springs Raceway in the SOCAL desert. However, it did take exhausting out through the hood. With your smaller (and lighter) engine (i.e. less heat energy) you should be in good shape with a modest radiator and fan (Don't forget that it gets into the 90's in summer up there in summer, just about the time the Indycars come to Portland).
BTW: Another thing I learned THE HARD WAY: even though our engines are water-cooled, 30 % of the cooling come from air over the block! I have an under-engine
spoiler to direct air up and OUT the engine cover grill.
If you have a wire-feed welder, you should be able to create a nice firewall with access plate. Even though my SBC fit behind the firewall, I eventually cut an access port to deal with hoses to my remote water pump, throttle cable, oil pressure sender connections , alternator belt tensioning and TIMING the engine. That's why I'm suggesting making a nice access hole. front access regardless of what approach you take can make life easier.
Keep up the great work!
Terry
Still deciding how I am going to make the firewall cap right now. Drivers firewall is fine in the stock spot. It's just the middle popout that & some behind the passenger seat that I need to make a piece for. Wish I had some skill with fiberglass. I'd build up what I need on the firewall in my spare car. The make a mold off of it. Shouldn't be that hard but it is a fairly large area to do with glass.
I bought renegade hybrids radiator. Very happy with their setup.
Hey JRust,
Don't let a little fiberglass work scare you....it's really very easy. Please see the fiberglass side scoops I made for my car. I had to makes molds and the whole bit.
A little time and there you are. It was my first try in doing this.
For your app, it will be even easier: lay on SEVERAL coats of mold release on your other car's firewall (rub on wax like a surfboard) and hang 2 layers of fiber glass on the whole thing. To keep in in place until it sets (15-20 minutes) you can either clamp the fiberglass in place or use magnets.
When the 2-layer piece is curred, it should be thick enough to hold it's shape. Remove the piece and then you can put it on a work table and build up enough layers for the desired finish thickness. Since the firewall will be covered by interior trim, you won't have to worry about a "perfect molded finish."
You might also take advantage of the opportunity to build more of a bulge by using a piece of WAXED foam or Papier-mâché for more room at the front of the engine.
Don't forget NEW should harness mounting points if you plan on racing seat belts.
The only bad news here is fiberglassing has gotten expensive. I would estimate that it will cost around $125 - $150 for the materials. However, if you can do the whole thing yourself, you will save big time over paying someone to weld in a metal firewall.
Best of luck,
Terry