'72 4 door, Tweety Bird

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hang_510
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Location: so. cal

Re: '72 4 door, Tweety Bird

Postby hang_510 » 13 Oct 2010 15:05

speeder wrote:The hoppers were unreal! I've never seen anything like it...

The general goal will be 125rwhp, strong in the mid range, with bulletproof reliability for back country thrashing as well as daily driving.

bugs like that never bothered me in a car... its truly something to avoid on a motorcycle, especially before helmet laws.



consider an LZ22 then.
bulletproof(well, same potential HG failure point), 125RWHP easy, and still looks like stock L series :mrgreen:
byron wrote:I'd be all over that like a fat kid on a smartie.

okayfine wrote:Sense doesn't always have everything to do with it, and I speak from experience.

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James
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Location: Laguna Beach, Ca

Re: '72 4 door, Tweety Bird

Postby James » 13 Oct 2010 15:13

I have to say I really like your car - nicely upgraded, but still true to the heritage. Good stuff.
Finished is better than perfect......

NICKLE&DIME
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Joined: 06 Feb 2008 11:02

Re: '72 4 door, Tweety Bird

Postby NICKLE&DIME » 13 Oct 2010 21:23

Nice pictures, is that Ms. Dottie getting loose in the gravel?? You have a nice car, and I also like the choice of parts.

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speeder
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Location: Durango, CO

Re: '72 4 door, Tweety Bird

Postby speeder » 14 Oct 2010 11:02

Thanks for the feedback guys.

I think I'm lucky, because a friend in the area happens to have an Frankenstein LZ22 (L20b block bored to 87mm, Z22 crank, rods, pistons) bottom end recently built and ready for use. We're probably going to just put a mild cam on my W53 head and go with it for now with the Webers. I can upgrade the head and carbs later if it's a little choked. I'm just dying to run it! It was SO MUCH FUN out in the woods carving it up and it kills me seeing it parked in the garage with the engine bay lookin' all empty after all the work all last winter, spring and summer long. I gotta drive my dime!!

Yes, it is Ms Dottie getting loose in the gravel. She is now a member of my extended Datsun family, brought in by an "anonymous East Coast Datsun collector" who also happens to be my brother. She was awesome on the run and is as clean and nice as everyone says. Props to those who have owned her in the past. She really needed nothing before going out and shredding up the tarmac for three days straight. The real Datsun Comp suspension parts that were put on there work well.
'72 4 door 510, '68 2000 Roadster

Rob

Re: '72 4 door, Tweety Bird

Postby Rob » 06 Nov 2010 18:36

speeder wrote:

Yes, it is Ms Dottie getting loose in the gravel. She is now a member of my extended Datsun family, brought in by an "anonymous East Coast Datsun collector" who also happens to be my brother.


My God.. Miss Dottie needs not to see any more gravel roads !! :evil:
I was gonna buy it when it was for sale, but lost my job that year ! :cry:
Where on the east coast does it reside now ?

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speeder
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Re: '72 4 door, Tweety Bird

Postby speeder » 28 Feb 2011 21:24

Spring is on the way, and Tweety Bird has a fresh motor, just in time for the upcoming Targa California in April. The LZ22 is in with the unported W53 closed chamber head (seats ground and new seals), stock size valves, an Isky stage 1 cam (L475- 475 lift, 270 duration), rejetted Weber DCOE42's on an unported Warneford intake manifold, stock L16 exhaust manifold into a 2" pipe on back. Timing is set at 27 degrees max advance and I limited the total advance on the diz to 15 degrees with JB weld per Jason Gray's distributor page. I can't advance it any more without knocking, and it's currently running on the rich side. It also got a NOS fuel pump and a fresh 3 row radiator. In an effort to rule out the fuel starvation problem, I pulled the gas tank and it was clean as a whistle inside. I also sucked fuel through the line from tank to engine bay with a 60cc syringe and it flowed very easily. It appears that the original fuel starvation problem was probably a bad mechanical fuel pump. While the motor was out, the original paint in the engine bay cleaned up nicely.

The motor pulls hard in the low and mid range; much harder than the L16 did. Power levels off around 5500 rpm, but it'll rev fine to 7K. New air cleaners are going on soon to help facilitate top end flow. There is a significant increase in the top end power when I have the air cleaners off. ITG filters are going on. I am planning to then go to the dyno for final tweaking, hopefully before April.

I also installed an Innovate Motorsports air/fuel meter. This is a really cool guage that takes oxygen sensor readings off a Bosch O2 sensor 6" behind the collector pipe in the exhaust and gives you real time air/fuel meter readings while your driving. In a modern car, this info feeds into the fuel injection and makes mixture adjustments accordingly. For carbs, you change your jets to get it right. Fun stuff.

Carb settings, pre dyno, running well:
Weber DCOE 42's
34 chokes
3.5 aux venturis
155 mains
F2 emulsion tubes
210 airs
60 F2 idle jets
40 pump nozzles
60 bleed backs
10mm pump rod

Cooked L16:
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Frankenstein meets Tweety Bird:
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Stubby stacks- worth 1-2 HP?:
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'72 4 door 510, '68 2000 Roadster

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speeder
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Re: '72 4 door, Tweety Bird

Postby speeder » 28 Feb 2011 21:33

Frankenstein LZ22 in Tweety Bird- Frankenbird?
LZ22 1.jpg
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Alfa guy or other dust eater,"what's in there?"
Me,"Uh, I think it's a 1.6L, huh huh."
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Air/Fuel meter, lower left:
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'72 4 door 510, '68 2000 Roadster

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speeder
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Re: '72 4 door, Tweety Bird

Postby speeder » 28 Feb 2011 21:36

A sunny Cali afternoon:
Tweety Bird R side.jpg
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Tweety Bird R rear.jpg
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'72 4 door 510, '68 2000 Roadster

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jason
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Re: '72 4 door, Tweety Bird

Postby jason » 28 Feb 2011 21:53

You're a cruel, cruel man picking on helpless alfa owners! We of course will want pics of the action!
Jason

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speeder
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Re: '72 4 door, Tweety Bird

Postby speeder » 13 Apr 2011 16:13

I ran the Targa CA last week in Tweety Bird. In stark contrast to the last event in the car where it went home on a flatbed with a blown L16, this time it kicked ass and I can still walk out to the garage, fire it up, and go out and rip any time. What a relief!! There was a pretty good 510 turnout with one wagon and 3 sedans among about 50 Porsche's, some BMW's, some Alfa's, a nasty Pontiac Tempest and a very interesting Corvair with Porsche 993 and 964 4 wheel drive running gear. I spent most of the event with running with a 356 and a 911.

All the work and tuning paid off. Last minute tweaks included NGK B9ES plugs, some carb heat shields, and one more degree of timing advance to 28. There's no knocking with a bottle of Lucas or NOS octane booster in a full tank of 91. Some last minute jetting changes also included 135 mains, 160F8 idles, and some high flowing ITG air filters. The A/F now reads high elevens at wide open throttle. The new 3 row radiator kept it perfectly cool and the fuel starvation issues were gone thanks to a new mechanical fuel pump.

It was an awesome event overall with about 1000 miles of deserted 1.5 and 2 lane roads in the middle of nowhere.
Big Sur summit 510, 356, 911.jpg
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'72 4 door 510, '68 2000 Roadster

Ash510
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Re: '72 4 door, Tweety Bird

Postby Ash510 » 13 Apr 2011 16:39

that looks like a lot of fun. I like mixxing it up with all different makes of cars. the car looks good sitting in front of the porches :D

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speeder
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Re: '72 4 door, Tweety Bird

Postby speeder » 04 Nov 2011 16:50

It's been a fun spring, running the Targa CA in the spring, then the CA Melee this September. Hardcore backroad meyham with all likes of vintage machinery.
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'72 4 door 510, '68 2000 Roadster

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speeder
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Re: '72 4 door, Tweety Bird

Postby speeder » 04 Nov 2011 16:56

Ground clearance continues to be an issue on Tweety. One particularly nasty dry streambed crossing yielded a hard hit to the undercarriage and we were very lucky to be running a good old steel L16 oilpan...
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'72 4 door 510, '68 2000 Roadster

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speeder
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Re: '72 4 door, Tweety Bird

Postby speeder » 04 Nov 2011 17:00

A loud resonating sound between 3 and 4K rpm's led me to change the motor mounts and trans mount. It certainly cut down on the vibration but didnt' get rid of the resonating sound. After tapping on the muffler a bit, it seems one of the baffles is flopping around loose, so I'm gonna get a new muffler.
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'72 4 door 510, '68 2000 Roadster

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speeder
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Re: '72 4 door, Tweety Bird

Postby speeder » 04 Nov 2011 17:10

I came out two weeks ago to go for a spin and the clutch was soft. A few pumps on the pedal and it was gone all together and there was a pool of fluid under the slave. I put in a new slave and master, then realized that the engagement point on the lever arm on the trans was way off. The original slave was fine. It had just pushed it's rod right out and then blown itself up while I was happily pumping up the pedal. Out came the trans. Turns out my motor builder put a 225mm flywheel on my LZ22 with a truck clutch. I mated that to the stock 510 throwout bearing and carrier and got about 3000 miles of very hard use out of it before it failed. Miraculously, it failed sitting right in my garage, not 300 miles out in the middle of no where on a 3 day driving event. Some research on The Realm (thanks again all!) educated me about the 200 vs 225 flywheels, clutches, and mating them to the correct throwout bearing and carrier. So I ordered up a new carrier and it's fixed. The long one is the correct truck carrier and bearing. The short one is stock 510 parts. Next project will be revising the exhaust to run 1-2" higher, a billet airbox for my sidedrafts (being done by a friend), and possibly a suspension overhaul to raise my car an inch or two.

throwout bearing carrier 1.jpg
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throwout bearing carrier 3.jpg
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'72 4 door 510, '68 2000 Roadster


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