Stoney Posted November 21, 2016 Report Share Posted November 21, 2016 Neither are motors I enjoy working on at all. As you have said though, the rotary is such a compact small package, perfect to get a good F/R weight distribution and low CoG. Quote Link to comment
drummingpariah Posted November 22, 2016 Author Report Share Posted November 22, 2016 Neither are motors I enjoy working on at all. As you have said though, the rotary is such a compact small package, perfect to get a good F/R weight distribution and low CoG. I'm interested now. Who doesn't enjoy working on a rotary? They're so simple. Other than initial tuning, what's not to like? 1 Quote Link to comment
drummingpariah Posted November 27, 2016 Author Report Share Posted November 27, 2016 UPDATE TIME! Because it's Saturday, I have an update on the build! I think I've solidified most of the fender profile at this point. I'd say it looks pretty good, and is ready for some final touches and blending to the bumper. I don't really have a way to express how much math and thinking went into the cage so far, but here are the key points: 1. It's friction-fit. I didn't even need to tack it into place, it's so tight against the body. 2. It's symmetrical. ... and level within 5mm from any point to any other point 3. There are no visibility problems. The diagonal X is 16" lower than the roofline, so it won't interfere with my rear-view mirror. 4. It reclines 10 degrees. Originally I was planning on 15 degrees, as that would fit the lines of the body and rear quarter windows nicely, but FIA regulations require no more than 10 degrees. I'd like to keep my options open as to what racing I do in this car, so I'm going with the most stringent sanctioning body I know of. 2 Quote Link to comment
drummingpariah Posted December 1, 2016 Author Report Share Posted December 1, 2016 Today registration for the Mt Washington Hillclimb race opened (Climb to the Clouds 2017). This has been my life goal for the past three years, since I purchased this car. For those who aren't already familiar with it, Mt Washington is the closest hillclimb to my home (around two hours away). It's also twice as long as the longest hill we typically run (over 7 miles). It happens roughly once every three years, and is a pretty big deal overall. The last time it ran I crewed for a friend and one of my racing mentors, Jamie Melhuish. It was quite an experience. In addition to learning twice as much course, we only get four practice runs. Each of those runs is only half of the course, so the first time we stitch the whole hill together, it's the first timed run. There are two timed runs. This is where a rally-style codriver reading pace notes becomes a massive benefit, but I'll be doing it solo. That means watching a lot of footage from past events, and spending a few days driving up at street-legal speeds to ensure that I actually know the course. Right now, my registration is in, but that doesn't necessarily mean I've been invited to race. I would need to be selected from the list of applicants to be invited to race. In any event, the only way I can be ready for the event if I'm accepted is to continue as planned and assume I'll make it to the start line. To say I'm excited is a gross understatement, like saying that an atom is "rather small." 3 Quote Link to comment
drummingpariah Posted December 2, 2016 Author Report Share Posted December 2, 2016 To celebrate having registered, I spent the night re-mathing and re-bending the driver's apillar. Tomorrow is the passenger, and the weekend is coping and tacking, then adding rockers, windshield, and dash bar. So far, everything is 1.75" DOM. For my own future reference, this is 20" straight, then a 47 degree bend, followed by 24" straight, 13 degree twist on a 42 degree bend, then 24" straight (which will be trimmed and coped to fit the main hoop). I may add one more slight inward bend to meet up with the main hoop. 2 Quote Link to comment
tr8er Posted December 2, 2016 Report Share Posted December 2, 2016 That is looking nice and tight. 1 Quote Link to comment
drummingpariah Posted December 3, 2016 Author Report Share Posted December 3, 2016 Thanks mate, I'm generally happy with the fitment thus far. Being picky at these early stages will give me a little wiggle room to make mistakes later on in the process, and I think that's worthwhile. I didn't really plan to get anything done today, just clean up the shop a bit in preparation for the weekend. Man, was I wrong. I nailed the passenger side A pillar so nicely, I decided to make another driver's side replacement ... but twisted the wrong way, which resulted in another perfect passenger's side A pillar. Then I made one more driver's side, and went so far as to add a small bend on the back of it to get it to fit up with the main hoop just so. Tomorrow, I get to break out the welder, tack it together, and start in on reinforcements. 2 Quote Link to comment
CGraves Posted December 3, 2016 Report Share Posted December 3, 2016 I have a very limited knowledge about rotaries but don't they respond very poorly to elevation changes? Quote Link to comment
drummingpariah Posted December 4, 2016 Author Report Share Posted December 4, 2016 Quite the contrary, they're commonly used in airplanes. The trick at high elevations (or low elevations, for that matter) is a turbocharger. A big one, it turns out. Normal 'piston math' for turbo sizing doesn't quite work for rotaries, and it's easy to choke the exhaust side with too small of a hot side. I'll get into rotaries a bit more later. There are a lot of downsides to them, handling elevation isn't one. Finally, everything's aligned and tack welded into place. I spent most of the day fine-tuning fitment so it's symmetrical on both sides and so I have as much headroom as possible, but the results are worth it. All told, I bent 6 'not quite right' A pillars throughout this process, so roughly 40' of material that didn't make it onto the car. It'll all get used, as door bars or similar. 1 Quote Link to comment
mttam510 Posted December 5, 2016 Report Share Posted December 5, 2016 Looking good! Nice radiator....the good shit! Quote Link to comment
drummingpariah Posted December 5, 2016 Author Report Share Posted December 5, 2016 Looking good! Nice radiator....the good shit! Used NASCAR. They go for around $150 or so. I don't really have a problem with used gear especially if it affords me to have a spare or two. I'd rather have three 'works well' solutions than one 'brand new' solution. Quote Link to comment
Stoney Posted December 8, 2016 Report Share Posted December 8, 2016 I'm a firm believer of "recycling" quality parts, NASCAR uses the best of the best, and things like their lightweight nylon braided lines can be had for next to nothing for things like oil coolers. Shame the stuff isn't readily accessible in Australia. I also visit wrecking yards to see if I can use something from a more modern car to upgrade a part in the old datsuns. Door seals, bailey chaneel rubbers, dash vents, seats, brakes, fuel systems etc. But thats probably the cheapskate in me. Quote Link to comment
drummingpariah Posted December 11, 2016 Author Report Share Posted December 11, 2016 A full day of work today, and it doesn't look like much progress. My friends Mike and Matty came out to help, and we wrapped up the rear body jig, then centered and leveled the body on the chassis. The A pillars weren't perfectly symmetrical, so they came out, received appropriate trimming, and went back in. We coped the dash bar, and bent up all the door bars. With the car on the rear body jig, we pulled the 2x4's that were supporting the middle of the car. A new horizontal support bar was welded in in front of the A pillars, and the existing horizontal support bar was removed. That free'd up enough room to test fit the seat, and it looks fantastic. I couldn't get any photos of it, but there's plenty of room all around in this thing. Finally, we took some measurements to ensure that everything that's tacked together so far will pass tech without any issues, and pressed on 'till midnight. Lots of tubing was cut today. 1 Quote Link to comment
frank88 Posted December 11, 2016 Report Share Posted December 11, 2016 Really enjoying this thread. Thanks for posting your progress. I especially enjoy a cage build Quote Link to comment
drummingpariah Posted December 17, 2016 Author Report Share Posted December 17, 2016 Update Time It's Saturday, so I don't have a 'big' update to announce. I think I've mentioned it before but in case I hadn't, we're recording a whole web series for this build, similar to what I did for the CRX. I've always enjoyed watching honest, well-produced video over reading build threads, and thought I'd give it a go. As I learned from the CRX build, it really requires a dedicated film crew (of at least 1 person). The level of quality I want really isn't possible if I'm trying to build and film at the same time. With that goal in mind, I spent the morning laying out the video capture gear and taking an inventory of what we use on a regular basis. This is the result. Yeah, I agree. This might be a bit silly. Anyway, with that out of the way Mike and I started off by finishing coping for the dash bar, which looks pretty solid now. After lunch, Mike took care of the sill bar coping and I took care of the bent door bars. They aren't quite ready to weld in, but we're making good progress. Unfortunately, we ran out of material for the remaining sill/rocker bar and the windshield bar (both are required to run Mt Washington). I'll have another 24' arriving Monday morning. Tomorrow, I think I want to set our sights on tackling the front suspension jig, since the 'core' of the cage structure is finally coming together. 1 Quote Link to comment
Eagle_Adam Posted December 18, 2016 Report Share Posted December 18, 2016 Very sharp looking!! Quote Link to comment
drummingpariah Posted December 24, 2016 Author Report Share Posted December 24, 2016 This is definitely behind the information you folks have been getting (video editing takes a lot longer than writing a post), but I'm still really excited to announce the video series of this build. 7 Quote Link to comment
Draker Posted December 24, 2016 Report Share Posted December 24, 2016 Shit... that's a killer video!! Quote Link to comment
CGraves Posted December 24, 2016 Report Share Posted December 24, 2016 I read through the old posts and was wondering about 2 things. Is your goal still to be ready by Climb to the Clouds? Or will you have to miss it? Also did anything ever come of the T shirts? Quote Link to comment
drummingpariah Posted December 25, 2016 Author Report Share Posted December 25, 2016 Shit... that's a killer video!! I can't wait to show you the rest of them, then! I read through the old posts and was wondering about 2 things. Is your goal still to be ready by Climb to the Clouds? Or will you have to miss it? Also did anything ever come of the T shirts? We're on schedule for CTTC2017 ... assuming my application is accepted. Whether I'm accepted or not, the plan is to start with some autox shakedown in April, with the first hillclimb event of the season in Maya. Tshirts started, but when the printer I was working with bailed, I didn't have enough gumption left to find a new one. We'll revisit it before the build series ends, though. Today, I got the new sill bars cut, coped, and ready to tack in. Holidays always interrupt builds, and I don't know how much shop time I'll be able to squeeze in tomorrow, if any. Happy Xmas (or whatever you like to do when everything is closed) everybody! 2 Quote Link to comment
Draker Posted December 25, 2016 Report Share Posted December 25, 2016 i'm not sure i've seen an actual video build thread on here yet. I've been here a while... but its possible i missed it. It's like a ratsun tv show... Quote Link to comment
drummingpariah Posted December 25, 2016 Author Report Share Posted December 25, 2016 The last time I saw a Datsun video build was with mull.tk on hybridz. If I'm the first on Ratsun, I'm perfectly fine with that. 1 Quote Link to comment
drummingpariah Posted January 2, 2017 Author Report Share Posted January 2, 2017 After test fitting the seat, I decided to move the floor up significantly. With my original floor location, a 6'2" person would have to struggle to see over the dashboard. The higher the floor is, the more ground clearance I can add or the lower I can place the center of gravity. I like both of those things, and I'm only 5'6" so if I'm going to go to any extreme, it'll be the "build for short people" rather than "built for tall people" extreme. Unfortunately, that was not a trivial change to make. I had to chop out the sill bars and door bars, then I had to cut out the X brace in the main hoop. Having the X brace terminate below the floor would defeat the purpose of moving the floor up, so it HAD to go. I made new sill bars and X braces, and am just starting to catch back up to where I was a couple weeks ago. We went from this: to this: It looks like such a simple change, but was a pretty massive effort. On the positive side, I'm getting quite good at coping with an angle grinder now! 2 Quote Link to comment
drummingpariah Posted January 2, 2017 Author Report Share Posted January 2, 2017 Thanks mate! For the episode we're recording now (should be ready to go live in Feb, I think) I decided to rent my "dream camera" (Sony a7s). Our Makerspace is lit like the basement under a dungeon, so low light performance was a big concern. With the right person behind the lens, this thing runs on pure witchcraft. This is a pretty good comparison of what the camera sees at ISO400 as compared to what the eye actually sees. I really wish I had the funds to buy one of these this season; It'd make filming so much faster, easier, and less inconvenient (leaving more time to build the car). Someday I will have one (probably the newer a7s ii, since it can record 4k footage natively without needing the Shogun I rented). In case you're wondering where the camera is actually looking in that photo, you can see the tall white bottle of air tool oil on the right-most, second-from-the-top shelf. Your eye sees black fuzzy shadow that might be a shelf, where the camera sees a line sander, spray gun, respirator, etc. 1 Quote Link to comment
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