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Bought a Miata


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So, I think we dodged a bullet (knocking loudly on all the wood within reach...).

 

This morning, I put the car up on jack stands and get underneath to look around. No coolant... apparently I was wrong about that, lighting in the parking lot, whatever... that's a good thing. Next, check the obvious suspects... oil drain plug is tight, oil filter is not... Oil filter had come loose and partially unscrewed, spraying oil all over the place.

 

So, that's not good... warranty isn't going to cover it. I'm pissed... 36 years working on cars, and I've never had this happen. I've done uncountable oil changes over the years. I went back to my records, and this was the 12th on this car I've done. More on that later...

 

Off to get a new filter and oil. My wife said it had made ugly noises at idle, but quieted down as she drove. That didn't make sense last night, but if it was the filter rattling on the threads...? Drained the 6 or so ounces of oil that was in the pan, put on a new filter and filled it with cheap dino oil (why fill with Mobil 1 if it's busted, right?). Start it up, and...

 

Everything sounds normal.

 

No knocking, no ticking... sounds fine. I back it into the driveway, put it up again and hose the undercarriage with degreaser and hose it off. Then I took it out and tried to break it. Buncha trips to the rev limiter, ran it through the gears, decel from redline...

 

Nothing... sounds normal. I'm starting to relax a little now. We drove it to lunch, and it was fine. Wife is going to drive it to work tomorrow, and I'll change the oil back to M1 on Saturday, and take a close look at the oil that comes out for metal. Maybe send a sample off for testing...

 

Whew... :D

 

Now, the rest of the story:

 

The last time I bought the oil change supplies, I was buying for the NC and NA (NB engine). Despite the fact that we'd had both cars for several years, this was the first time I ever bought filters for both at the same time. I had asked for the two filters and the NAPA counter guy had told me they were the same for both cars... I said, huh, I'd never realized that. I took both filters home, and changed the oil in both cars... this was the end of September.

 

Guess what... they're close, but they're not the same.

 

So, the NC filter is vertical. When you remove it, it usually dumps oil all over the crossmember. My routine is to use a wad of paper towels to remove it directly into a freezer bag to minimize the mess. Since I'm already under the car, the new filter is sitting by the jackstand with the gasket oiled, and full of oil, ready to go. Remember, this is my 12th oil change on this car... got a routine. I never even thought to compare the filters. So the wrong filter is the same thread, just a slightly smaller diameter. It snugged up just fine, and after a warm up run, passed the leak check. It made it ~1200 miles before the gasket blew out and it loosened up...

 

I discovered the filter issue when getting the new filter this morning, because I also picked one up for the NB's new engine, and when I saw the two side by side, I realized immediately what had happened.

 

What a clusterf*ck!

 

Well, it runs, but who knows what hidden damage is waiting to rear it's head... :(

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I hear the only thing that kills a Miata engine is overheating. I think someone over at Miata.net ran an engine without oil on purpose to kill it and it just kept on going for a while.
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So, back to our regularly scheduled programming...

 

Yanked the dead motor out of the NB...

 

38091674376_53efba1b54_c.jpgDSC_1343 by Rodan AZ, on Flickr

 

And installed the RB header in the NA.

 

38091692206_c648412a46_c.jpgRB header installed by Rodan AZ, on Flickr

 

Need to drive the NA around a bit to get a heat cycle in. I've found that re-torquing header bolts after a heat cycle really helps them stay put. Didn't want to get stuck in the middle of the intake swap, so that will wait a bit.

 

I got the VICS manifold and harness pulled from the 99 engine. They're going to need some cleanup before going on the replacement engine. I think I'm also going to order some injector o-rings and a couple other small parts. I was going to do it cheap and dirty, but I hate having to re-do stuff down the road. Going to try to do some more tear down on the engine tonight... see if I can get all the way to pulling the head.

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Also I'm surprised you are running a stock radiator.

 

I stuck with it to get the car running, but it's never become an issue, so I just kept it. Highest temps I logged at Laguna was 195*.

 

It will get upgraded eventually... :p

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Did a little teardown on the '99 motor...

 

It was missing all but three bellhousing bolts on the trans, but the clutch looks like it should be serviceable. I also got a clutch with one of the VVT motors, so I'll pick whichever is best.

 

The oil cooler sandwich plate was loose, which looks like it was the source of the oil leak.

 

Head looks OK, cams turn fine.

 

Block isn't looking all that great...

 

38094770806_b9fd92cf61_c.jpgDSC_1351 by Rodan AZ, on Flickr

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Finished the intake install yesterday...

 

38155324772_9d73340cd1_c.jpgFT-RB-SK2 installed by Rodan AZ, on Flickr

 

The Skunk 2 inlet was larger than the stock TB, and I was able to get the coupler over it, but I need a larger clamp as the old one wouldn't fit. Need to calibrate it to the MS3 and fire it up this morning. I'm wondering if it will still idle... :lol:

 

I was a little disappointed with the hardware supplied with the throttle body. Both screws for mounting the IAC/adapter were too long, bottoming out before tightening. I was able to shorten them, but it was a PITA that shouldn't have been necessary.

 

I also cleaned up the fuel line runs, which had been bugging me since I got the car running. The stock fuel hard lines in the 1.6 point to the rear. I used a brake line bender to bend them the other way, allowing for a much shorter run of rubber line. Should have done this a long time ago, but I was in a hurry to get the car running, and have been busy since... :p

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Those were announced right about the time I bought my flattop... I figured they'd be vaporware for at least another year, but of course they're available... :lol:

 

And now Emilio at 949 has posted a dyno comparison between the S2 manifold and Flattop on an n/a VVT engine, and the S2 was only marginally better. Not enough to bother.

 

Still waiting for turbo results, though.

 

If I didn't already have the flattop, I'd consider the S2, but reading the other threads, it looks like there's some install hassles as well. The stock manifold is bad enough! :p

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So, finally some results....

 

I went out and did some road tuning today. AFR's were still surprisingly close with the new intake/header, but I did make some adjustments. Car feels great! :D

 

I had done a few "pulls" for Virtual Dyno at the end of October in anticipation of the swap. I wanted as direct as possible comparison before/after. I got really lucky with the weather... 68* F for the before runs, and 70* F for the after runs. Base barometer was 81.6 kPa before, 82.2 kPa after. Conditions were about as close as you can get two weeks apart at this time of year.

 

I had done the before runs with just a warm up cycle, but the after runs had ~45 minutes of driving and tuning prior, so were made with intake temps a full 10*F above the before runs. Obviously, the runs were done on the same road in the same direction.

 

As I've noted before with Virtual Dyno, I'm much less interested in absolute numbers as I am comparison. Anyway, here's the graph, with two 'before' runs compared to the 'after' run (only had time for one in each direction today). Red and blue are 'before', green is 'after'. These numbers are uncorrected for altitude...

 

38291897591_f4310146f5_c.jpgFTRB beforeafter by Rodan AZ, on Flickr

 

Anyway, I'm pleased with the result, and it turned out just about as expected. Of course, these are very well documented mods, so expectations were clear. :cool:

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The nice thing about swapping an NB2 engine into an NB1 chassis, is the wiring is a LOT easier than putting one in an NA... You just use the NB1 harness on the NB2 engine, with a couple of mods. I had already installed the NB1 fuel rail and injectors.

 

Last night I worked on the coils. They wire up just like the NB1 coils, except a different connector is used, which I was able to buy with wires already attached from Ballenger Motorsports.

 

In this pic, you can see the plugs on the coills. The gray connectors at the back of the valve cover are the stock '99 connectors.

 

38285412906_d3754fe1e2_c.jpgDSC_1360 by Rodan AZ, on Flickr

 

Wired up

 

38309785332_c049a9371c_c.jpgDSC_1361 by Rodan AZ, on Flickr

 

And tidied up

 

38285411716_2bea728ac6_c.jpgDSC_1363 by Rodan AZ, on Flickr

 

The tricky part is figuring out which wires go where, and fortunately, someone else already did the work: http://www.mostlymiata.net/1999-2001-vvt-engine-swap/vvt-engine-swap-ignition

 

Today, I did some cleanup. When I cleaned the transmission on the NA, it took me something like 3 hours, and a half case of Brake Cleaner. I didn't want to repeat that, so being a lazy bastard, I bought a pressure washer at Sam's Club this morning. On sale, so good timing!

 

38309784372_2becc57da5_c.jpgDSC_1364 by Rodan AZ, on Flickr

 

I figured with all the chassis cleanup the NB is going to need, it would be a good investment. Combined with some Super Clean, it did the job in about 45 minutes...

 

Before

 

38309786242_baf12ef36f_c.jpgDSC_1345a by Rodan AZ, on Flickr

 

After

 

38309783902_bed6871dbe_c.jpgDSC_1365 by Rodan AZ, on Flickr

 

 

And I've already got a vulture circling on M.net who wants the '99 cylinder head... :lol:

 

If I get a good price for that, it'll nearly pay for one of the VVT engines! :p

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I hope you're over there buying that... right now! :p

 

Seriously, that looks a really good buy, especially if it could be picked up for $4500-4700...

 

Not a fan of that color, but car looks super clean, stock, and matching hardtop! Unless the small pics are hiding bad stuff, looks like a winner.

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Yeah it’s a really good deal for a 6spd car with factory matching hardtop. I really don’t need a 4th car right before we move into the new house next month:spin:

 

It’s annoying though because 2-4 months ago this is exactly what I was looking for.

2003 Baja 5MT

2016 Outback 2.5i Premium w/Eyesight

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