All the cool kids are doing it..., Low budget progress thread (Slow Race prep.) |
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All the cool kids are doing it..., Low budget progress thread (Slow Race prep.) |
BMXerror |
Sep 17 2007, 09:42 PM
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#1
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Senior Member Group: Members Posts: 1,705 Joined: 8-April 06 From: Hesperia Ca Member No.: 5,842 |
Well, with all the work that I'm doing to my car lately, I might as well start my own progress thread.
Backstory I bought 4702912742 from my pops about a year and a half ago for $600 dollars, but it wasn't a steal. It had been sitting for about five years and needed a lot of work. He A couple years later he had been looking for a teener for a little while and picked this one up cheap at a dealership in Pomona Ca. He drove it for a while, but it had tons of problems, and soon he decided to sell it. However, the person who test drove it blew first gear, and out to the back yard it was sent. Fast forward five years to when I was financially ready to get a car to start racing. Long story short, after deciding that I wanted the 914 instead of an older Miata, I told him I was interested. He said that if I bought him a set of mufflers for his bike, we'd call it even. After that I spent about another 4K just getting it drivable. I replace all four rotors, rebuilt all four calipers, replace the brake lines with braided steel, replaced the hard lines that I broke, replaced the master cylinder, resealed the motor (after my socket and extension locked the motor up), bought two trannies for it (the first one was no good), put a new clutch and pilot bearing in it, put new rubber on the ground (Khumos), fixed and lubed all kinds of latches and hinges to be able to get into all the various compartments, replaced most of the vacuum lines and fuel lines.... the list goes on. These were all just stock replacements to get it running well. I further had to fight with the injection system for a few months until I figured out that I had it hooked up wrong. (IMG:style_emoticons/default/headbang.gif) Of course, this is the very abbreviated version of the story. As anyone with one of these things knows, the words it takes to describe what parts you changed don't even come close to showing the blood, sweat, and yes, sometimes tears that you put into your work. But anyways, it is running decent now (the motor is still a little tired) so it's time to do some improvements. After all, racing is what I bought the thing for. So I'll try to bring anyone who cares up to date on some of the things I've been working on. Mark D. |
BMXerror |
Oct 26 2008, 05:09 PM
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#2
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Senior Member Group: Members Posts: 1,705 Joined: 8-April 06 From: Hesperia Ca Member No.: 5,842 |
Well, this is the first work I've done since Allen died. This was another typical example of how my car has come together the past couple years. I had an idea of something that could be better, I came up with a solution, ran to tell him to show him how smart I am, and then he came up with a way better way to do it! (IMG:style_emoticons/default/biggrin.gif) Well, not completely, but we did bounce ideas off of each other a lot.
Here's the problem. There was a lot of slop between the rear lever thing on the transmission (highly technical terminology, I know) and the input shaft for the gear selector. This was resulting in about 1/4" of play just at the end of that lever. Multiply that up the long shift lever, and it turns into a lot of forward/back slop. So what we came up with was to drill the rivet out of that rear lever and use cone screws instead. Well, when I finally got to it a couple weeks ago, I drilled out the rivet and found out that the hole in the input shaft was much larger than the rivet, which caused the slop. I don't know if there's more that's supposed to be in there or not, but I didn't like it one way or another. This also meant that cone screws alone wouldn't work. I had to machine an aluminum sleeve to press in that hole in the input shaft and reduce the diameter so the cone screws would actually have something to press up to. I swore I took a picture of the sleeve, but I can't find it! (IMG:style_emoticons/default/mad.gif) First step was to drill out the rivet and remove the lever. After that I had to drill and tap the lever for the cone screws. M8 X 1.25 With the cone screws installed. They both compress into a common aluminum sleeve and is press fit into the input shaft. The press fit came out perfect. Not too hard to tap in, but certainly not coming out! The result is a very tight fit on the input shaft and reduced slop in the shift linkage. The results were pretty satisfactory. There wasn't as much reduction in the forward/back play as I had hoped, but there is a much more positive feel when selecting a gear. You KNOW when it's in and when it's out, as well as when it's starting to mesh. A while back ago I also made a similar aluminum sleeve to go between the transmission case and the rear bushing. I drilled the case out to 7/8" and machined the sleeve to be pressed in (If I had to do it again I wouldn't drill the case). This makes the rear bushing fit super tight. You actually have to take the sleeve out, press the bushing into it with a vise, and then tap the whole assembly into the case with a hammer..... it's not coming out, though. This reduced the side to side play considerably. The combination of these modifications, in addition to the Weltmeister short shift kit that was on there when I got the car makes for a fairly nice shifting 914.... It still shifts like a 914 though. (IMG:style_emoticons/default/biggrin.gif) Anyways, no money as of late, so this is the kind of stuff I've been doing... Well, that, and planning out the roll cage that I hope to build next year. It'll be tough without the other half of my brain, though. (IMG:style_emoticons/default/sad.gif) Miss you bro. Mark D. |
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