26 July, 2009

More Scoops/Ducts

Since it has been hot as hell the past couple weeks, I haven't bothered going out to the garage after work to finish up the scoops. Until this Wednesday and Thursday when I did a bunch of little fitment and trimming to the inner ducts. Then Mr. A came over Saturday morning and helped me slop some epoxy into the joints of the interior baffles that separate the air flowing to the cylinders, and to the oil cooler. After a bit more trimming and final fitting, I hit them with some flat black paint. These don't need to be "pretty" since they sit inside the engine cover mostly out of view.

I'll have some time later in the week to work on the exterior scoops since Susan will be off to Jesus fest at Laguna Seca for a few days.


08 July, 2009

Making cooling ducts for the FV

One of my planned mods for the FV is to replace the cooling fan and shroud with some duct work and scoops. At higher rpm, the fan belt tends to slip enough to where the fan essentially stalls out at say 4,00rpm, even when the engine is turning 6,000rpm. With the greater horsepower of the bigger engine, my oil temperatures were climbing up to about 250 degrees F at the last race, and it was only in the mid 80s temperature wise. Without better cooling, I would never be able to run in hotter temps, or for longer sessions.

I am attempting to kill two hot birds with one cold stone. First, I want to use some air scoops mounted on the outside of the rear bodywork to suck in air and push it through duct work down onto the cylinder heads. Second, I want to also direct some air to the oil cooler.

Previously, the oil cooler was located just in front of the fan shroud intake. Not the most ideal position, since the fan is pulling air through the oil cooler and then sending that warm/hot air onto the cylinder heads. But, with the 1200cc engine, I never saw high oil temps, so there was no real reason to "fix" it.

I'm hoping that the combo of ramming air onto the cylinder heads, and providing cool air directly to the oil cooler will solve my issues.

The first part of this job is to create the internal duct work. And by internal, I mean what fits inside the rear bodywork, which is mostly exposed. The duct work will fit between the opening in the body down to the cylinder head tin. After carving out the rough shape of the ducts, I quickly realized I could simply add on a bit of extra duct work to send air to the oil cooler. Instead of having to make individual ducts, or mess about with hoses etc.

The shaping and sanding of the foam was actually a lot of fun. It took a bunch of test fitting to get it right, and each side was slightly different in final shape and size. Here is a shot of them fitted inside the engine area, but before the final shaping took place:

The oil cooler will be moved to the right and up, so that those two curved parts of the ducts are centered on the cooler.

And here is a closeup of the "passenger" side after shaping and sanding:

The upper right part of the duct in the above photo is where the air enters. The air will be ducted down and out the bottom for the cylinder heads, and across and through the upper curved pieces for the oil cooler. I'll make a small dividing wall to separate the two flow paths.

These foam pieces are essentially the male plugs, and will get wrapped in fiberglass. I can either melt out the foam with chemicals, or simply hog it out with some screwdrivers and wire brushes. Basically, a perfect example of a "lost foam" process, like how I've made motorcycle seats and gas tank extenders before.

The next part of the project is to make the outer air scoops, which will attach to the stock engine cover. I'm trying to keep things both simple, and original looking. I'm hoping the air scoops won't be that noticeable, yet provide enough area for adequate cooling.


05 July, 2009

Spring Cleaning

After the extended FV engine build I finally got around to cleaning up the garage a bit. I still need to organize a bunch of stuff hanging out on the FV side of the garage, but at least the motorcycle side looks more respectable.

Thats the 1200cc FV engine sitting in the middle, awaiting its teardown.

And a quick shot of the bikes hanging out in the front yard, after receiving a washing.