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Ben, the vertical 180-degree run is to mitigate the amount of oil that makes it to the breather. The lines go near the top of the breather and you want enough capacity so that those lines aren't exposed to fluid. This is why you may need to empty the breather from time to time. A check valve...

My Albins specifies 100 – 150mm of vertical run as close to the transaxle as practical. My assumption is that this greatly reduces the amount of oil that makes it to the breather. My plan is to put a 180-degree bend in an aluminum tube for the vertical section so that the oil has to push up...

I'm not sure. People seem to be happy with the results, but I haven't seen anyone measure things. I have a digital 600-pound hanging scale and I'm thinking about setting up a bench test rig with a come-along to pull the brake pedal from the back. I would then connect a pressure gauge to both the...

Joel, I haven't found any documentation on the iBooster, so I'm going to have to try it and see what happens. A couple of thoughts: I don't think that the amount of boost for vacuum-assisted brakes will be completely consistent because the amount of boost is dependent on the pressure...

Power Brakes: Part 1 Several owners that I know with finished SL-Cs lament not having power brakes. I asked Allan, who’s built 28 SL-Cs and 5 GT-Rs, and he indicated that brake pedal effort is the number one complaint by far. I don’t have power brakes in my cobra, but the SL-C is heavier, more...

The rear is starting to look pretty wicked. Everything after the catalytic converts is 3.5” titanium. The muffler assemblies are fully welded and the rest is tacked. The first step was to connect the catalytic converters to the mufflers via titanium pie cuts. A titanium flex bellow was used to...

30+ years ago ERA recommended that I use Central Connecticut Coating to ceramic coat the headers and side pipes for my cobra. I've been very happy with the results and Allan uses them for everything he does. The guys doing the fabrication on my SL-C do a lot of exhausts and high-temp turbo...

Dave, thanks for the book recommendation. I've learned that aero is fickle and often opposite to what I thought. I have retained an xF1 aerodynamist to do the CFD modeling on the radiator outlet. I'll use him for the splitter/canards and diffuser. It's not critical to my use case, but I've...

I'm using stainless studs and copper nuts which are a one-time use item. If I wasn't using copper, I would use stainless steel. The other question is what, if anything, you're going to put on the threads.

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CONTINUED FROM ABOVE I agree that you maximize downforce on the front end, but I disagree that you match the front to the rear. Instead, you match the rear to the front. Like most non-formula and prototype cars, the SL-C’s rear wing will easily overpower the front end. All of the race SL-Cs...

Before I respond to the questions and comments, I’d like to make a couple of points regarding the active wing. Given all the discussion above regarding weight it’s important to understand that the wing, end plates, wing support pods, actuators (located inside of the pods), ECU and wire harness...

I finally got around to mounting the EC for the active wing. It has four feet with mounting holes so that should be simple, right? Nope… There are no instructions regarding mounting and when I went to install it I realized that it had a cooling fan. I called Aeromotions and they confirmed that...

Neil, I take your point, but I haven’t seen a SL-C that approaches the barn door comparison. The better thing is that, to my wife’s dismay, I’m not limited to one home-built car. You’re advocating a lightweight, no-frills build which is a good objective, but I’ve been there and done that 32...

Brian, I used an actuator-on-caliper solution from HiSpec which has a lot of benefits: Lower total weight than the solution offered by RCR Lower un-sprung weight than the solution offered by RCR (this surprised me) ECU with cast metal case and potted electronics High-quality harness and...

My friend Peter's SL-C

IMO it's a general trend because it's so easy to generate gobs of power once you go forced induction. Weight vs. features depends on what you're trying to achieve and what you're willing to spend. My car will be a street car that will see some track time. It's also my home-built "halo" car so...

Neil, It's still under construction so I don't have an idea. Why do you ask?

I upgrade the OEM coil packs with RaceGrade IGN1A coil packs. They contain an inductive ‘smart coil’ capable of producing extremely high spark energy (103mJ+) and are suited to anything from moderately-powered-endurance applications through 3,000+ horsepower blown-alcohol motors. Since no...

I was initially concerned that the aluminum bushing that supports the bellcrank would wear, but I'm not aware of that ever happening. However, I am aware of a couple of cars in which the 2" x 2" tube that supports the bellcrank developed cracks on the joint with the front billet upright. The...