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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#101
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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 |
Jul 11 2008, 10:16 PM
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#102
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Senior Member Group: Members Posts: 1,705 Joined: 8-April 06 From: Hesperia Ca Member No.: 5,842 |
Well, I haven't posted anything in a while because I've been building an engine. This was my first engine and I think it turned out alright. I won't bore you with a lot of pictures of a stocker, mostly because I didn't think to take any! (IMG:style_emoticons/default/biggrin.gif) This was a budget rebuild due to the fact that I wasn't ready to do this yet. I just lost compression in one cylinder late last year and it needed to be done.
It's not totally stock. I machined the combustion chambers down to 45 ccs putting the compression at about 9.4:1. I did this because I got into the motor and found that one side had been machined and the other hadn't! (IMG:style_emoticons/default/headbang.gif) So I wrote a quick CNC program at school to interpolate the pockets and just changed the offsets to get my proper depth. I just took a couple thousandths to clean up the side that had been done already, but I had to take .062" on the other side to match it. I got all the combustion chambers equal within 1cc without having my CC kit there with me, so I was pretty happy with that. I also had to face cut the underside of the heads in order to clear the shoulder on the cylinders. Fuzzy cell phone pics to follow. I also lightened my flywheel to 12 pounds on a manual lathe(pics already up). I wanted to use a CNC mill with a program that I made in Mastercam to cut a lot more off, but I wasn't able to use the mill for that job. So I did it the oldschool way. I used a 440MP camshaft from Fat Performance with heavy duty T1 springs and strait cut cam gears. I also blocked off the stock oil cooler and added a thermostatically controlled external oil cooler with a fan... Oh yeah, it's still a 1.7... I didn't mention that. haha. Anyways, it's no powerhouse, but it pulls pretty good. It actually has power up to the 5700 RPM redline, where as before it pretty much fell flat on it's face at about 5200! It also runs much smoother due to equal compression from bank to bank! lol (IMG:style_emoticons/default/slap.gif) I wanted to dyno it, but they couldn't strap the car (long story). The whole deal including the machine work, new pistons and liners, new bearings/seals, new exhaust valves, the oil cooler, and an AFR gauge setup cost me about $1900. That's not terrible, considering that some of those upgrades can be used on my next T4 engine. Pretty decent for my first ever engine build, too. Mark D. A lot of pieces in that dinky little machine. The crank needed micropolishing for minor wear marks, but was in print, so I didn't have it machined. |
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