build diary

February 1, 2005:
The engine is almost fully assembled.
entry 777

February 3, 2005:
It's amazing how easy it is to install the engine in this car.
I brought the hoist and engine home last night. It was late so I decided to install it some other night. Then, around 10:30, I figured it would be good to get something accomplished. I popped the engine in, bolted it to the transmission and installed the starter, alternator and most of the cooling system. All that's left is the intake manifold, the exhaust and then the usual pre-start checklist. When I wandered back into the house, it was only 11:30! If only it was always this straightforward. Painting the block silver wasn't a great idea, though. I thought it would look good with all the aluminum in the car, but it looks like paint when compared to the bare aluminum head and oil pan and the polished panels. Black would have been better. Oh well, next time it's apart I'll do that. Next time?

Once the engine is broken in, it's off to the dyno. I'll see if I can regain all the power I lost with oil consumption (oil is low octane, a particular problem for my 11:1 compression!) and maybe push it a bit further. Then I'll strap on a set of individual throttle bodies to see if I can make those work. I know they'll look great. Some good news arrived today as well - on top of the autocross scheduled for March 13th, there's also a track day in Pueblo that weekend. This time I'll be there to work on actual car setup instead of simply playing around. Before I go, I need to install the new front suspension uprights and make some new tie rods. Well, maybe. I'll see what happens to the angle of the ball joints with the higher steering arms. I'm also seriously considering making a lower windshield for the car. It's the one thing that bugs me about how the car looks. Not significantly lower, just an inch or so with a flatter top. I think it will look more purposeful. With what I learned last time, it should only take an afternoon to construct.
entry 778

February 5, 2005:
It's alive!
Again. After a bit of puttering and some spilt coolant (whoops, forgot about that little cap that's supposed to go on the back of the engine) I fired up the engine. It's a happy little unit, idling smoothly and quietly with solid oil pressure. Phew! I've driven the car around a bit and seated the rings. Boy, does it feel good to drive this car again. There are still a number of things that need to be done to get it into shape for Pueblo but right now I'm just happy to have it running around. The weather even cooperated with a warm sunny day.

If you look at the photos you'll notice I've painted the exhaust black. The silver never really worked well visually because it matched the bodywork too well. It also picked up all the dirt thrown by the front wheel and the slight leaks on the slip-on collector left black smears all over. So now it matches the wheels and the black hides the carbon. I'm quite happy with how it looks. With all that done, it's time to go skiing for a few days.
entry 779

Just for fun, I decided to paint the exhaust black instead of silver.
It looks much better - particularly where the slip-on collector leaks.
entry 780
A small touch, but one I've really come to appreciate.
A bit of vacuum hose around the edge of the cutout for the shift lever cleans things up beautifully.
entry 781

February 9, 2005:
You'll be glad to know that the skiing was good last weekend.
But even more fun was this afternoon. Jeremy (a coworker) and I headed out to the local twisties to take some action shots. To make the car look good, I spent a bit of time polishing the body last night with Nevr Dull. It was a fairly quick job but it sure livened up the little beastie! None of the photos I've put on the site really show it off. To do a proper polish will require a lot more effort but this is good enough for the winter sun. The engine was happy and felt strong, while the new tires were extremely grippy. That's all good, then.

Why were we taking action shots when we should have been at work? Well, we needed something for the cover of the book. Yes, I'm working on a book about the Seven. The title isn't fixed yet, but it will be a combination of a build diary and a technical how-to on how to build a homebuilt or kit car. A combination of this website and the tech help I've been giving out by email. Call it an entertaining reference book. It should be on the shelves at the beginning of November - I'll be a little busy for the next two months!

I was goofing around on Google last night and came across this car. It's actually a little spooky. I would not be surprised to hear that's the same paint I used. Even the steering wheel is the same. There's some nice work on the car. I particularly like the dashboard.
entry 782

One of my favourite photos of the Seven.
I'm grinning like an idiot.
entry 783
It sure is hard work driving for photographers.
Jeremy Ferber was behind the lens.
entry 784
Something about this shot makes it look like vintage racing to me.
Not the background, the pose of the car!
entry 785

February 13, 2005:
Yesterday was spent in the shop, working on the front end.
I've been concerned about my tie rods for some time. Specifically about the angle reached by the rod ends at full droop. Close examination proved my worries were well founded. The rod ends were acting as a limiter on the suspension travel. This isn't good - eventually the rod end tires of this game and breaks. Much excitement ensues.

A few weeks ago, I tracked down some 1999 Miata steering knuckles. They had a slightly higher steering arm to help this problem. I also decided at the same time to change over to ball joints instead of rod ends. They're not as adjustable as the rod ends, but they are more durable and were designed for this specific use. This meant new tie rods. No problem, I had a few of those.

Imagine my surprise when I discovered that Mazda apparently used two different sized threads on their tie rod inner joints. I figure the most recent set I'd picked up were from a 1999 or later car. I discovered this after I'd cut one in half, of course. One of my "new" tie rods had the larger thread I needed but I was forced to cut up one of my rod end versions for the other. I wasn't planning on using it again but it would have been nice to have the option!

It took a bit of time, but I'm much happier about the steering setup. It seems to be just as sharp as before and there is absolutely no slack or clunk if I wiggle the wheel at a standstill. On the road I feel as if I'm getting more kickback but that must be my imagination.
entry 786

The steering at full droop.
The rod end is acting as a limiter - not good!
entry 787
Despite some grinding I'd done, it's obvious the rod end is chewing on the steering arm.
There were marks on the rod end as well.
entry 788
Surprise! Mazda has used two different inner tie rod threads over the years.
entry 789
Measuring the length of the tie rods.
The steering rack was centered and a ball joint was installed on the steering arm. The wheels were set to 0 toe and the distance from the rack to the inside of the ball joint was measured. The tie rod was built about 7mm longer to allow for adjustment.
entry 790
The new ball joints installed, along with new uprights painted a nice satin black.
entry 791
I'm very happy with the black exhaust.
It hides a number of sins and looks great.
entry 792

February 20, 2005:
Every moment of my time has been spent working on the book.
I'm trying to make it entertaining to read as well as technically useful. All this writing has meant that I'm not working on the Seven. Well, sort of. I spent today with the car strapped to the dyno, trying to get back my "missing" power. The second dyno run was 134 hp at the rear wheels, right where this engine should be. However, I had problems with a lot of variation between runs. Odd. The fuel filter was changed and a feed line rerouted as the car was starting to show signs of low fuel pressure again and that helped, but I still never hit that 134 again. It was a bit frustrating - but I gave up and started work on installing the individual throttle bodies that we have sitting on the shelf at Flyin' Miata. It took a bit of creativity to get them to work with the stock throttle cable but I have that sorted now. Eventually I managed to get them installed and the injectors proceeded to leak quite enthusiastically. It turns out that the special fuel rail also includes special little clips to hold the injectors in place. Very cool. Now, before I fire it up, I'll have to install new injector connectors (easy) and plug up a coolant line (easy). Then the hard part starts - can I get it to idle?

I've also been doing some shopping. The snowmobile trailer I used to tow the Seven to the track last time worked fine but it was quite an adventure getting the car on it. I've decided to buy a real trailer for the car. I'd build my own but I'm frankly just too short on time. I found a used one that has a 6x12' deck on it for not much more than it would cost me to build. It needs a bit of love but nothing major. I'm building my own little race team! Now, where can I park it?
entry 793

February 21, 2005:
Did I mention I have better things to do? Today I picked up my "new" trailer.
It needs a bit of love (don't we all?) but it should do the job beautifully. I also managed to get the Seven running on the new throttle bodies. It idles fairly well considering the rough state of tune and makes an intoxicating noise when I blip the throttle. Hee hee hee. Now all I need to do is determine if they're making more power than the stock part, and work out an air filter for them.
entry 794

Dyno time.
With the freshly built engine, I pulled 134 hp at the rear wheels. Woohoo! See it on video.
entry 795
I have better things to do.
But I've wanted to put these on the Seven for soooo long...
entry 796
My new trailer for the Seven.
Nothing fancy but it's perfect for what I need. Dig those wheels!
entry 797
<< | show individual entries | >>