Pics of a Duetto racer buildup - Page 35 - Alfa Romeo Bulletin Board & Forums
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post #511 of 764 (permalink) Old 11-09-2014, 07:24 PM
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Love your work!
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post #512 of 764 (permalink) Old 11-09-2014, 11:42 PM
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Quote:
Originally Posted by Craig_m67 View Post
Love your work!
+1. Good machinist.
Pete

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156 Series 1 v6 ... and remember it's all just opinions
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Last edited by PSk; 11-09-2014 at 11:47 PM.
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post #513 of 764 (permalink) Old 11-14-2014, 08:31 PM Thread Starter
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Thanks, fellas! I'm just a hobbyist taking matters into his own hands, for better or worse.

Not much to report, even though I've spent hours over the last few days taking advantage of unusually dry (but cold!) weather here in the Pacific Northwest to work on the car in the driveway. I brought it home this offseason instead of leaving it in its trailer at the offsite storage facility (to my dog Baldor's dismay).

Spent a fair bit of time under the car taking measurements of where things need to go for the sliding block. Lots of staring, poking, and pondering. I've concluded that the exhaust system needs to be rerouted, and the fuel pump relocated before I mess with things further. I'll probably do a GTA-style side dump exhaust since the sliding block and it's reinforcing struts will block the usual exhaust route.

I also took a few more bites out of the oil system upgrade project. It's made up of a new homemade remote adapter, Setrab cooler, fresh lines, and Aeroquip fittings. Like I said, this was a pain. Glad it's done. Haven't tested it yet; for all I know, I might have introduced worse oil seepage than before. But for now, I'm going to imagine lower oil temps and a drier engine bay.
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post #514 of 764 (permalink) Old 11-15-2014, 07:59 AM
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I used to race with a GTA side-dump that was lovely but really really loud. Most tracks today have noise limits that would make that impractical. Be sure to check the rules where you drive.

Robert
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post #515 of 764 (permalink) Old 12-09-2014, 12:15 PM Thread Starter
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Robert is absolutely correct about the excessive noise of a side dump GTA exhaust. Which is why I am retaining my magna flow muffler. That means cutting the collector pipe shorter and moving the muffler forward.

But first, I wanted to weld up those holes in the manifold pipes near the head. My engine builder drilled and tapped those to insert temperature probes for when he tuned the engine on a test stand and dyno. I'm not sure what benefit individual cylinder exhaust temperatures would give, since I don't plan to tune each cylinder individually with its own carburetor jets.

Anyway, he plugged those holes with brass screws and then secondarily fastened them with hose clamps. That's been annoying me for the last five years, so I'm glad to be able to finally address it, since I was planning on sending out the reconfigured exhaust for a fresh ceramic coating. A few quick spot welds and some light grinding with sanding, and the problem is done.
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post #516 of 764 (permalink) Old 12-09-2014, 12:32 PM Thread Starter
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The old collector pipe was seized with rust onto the end of the header. I destroyed the collector while removing it. Having to remake it, I used the opportunity to use thinner (lighter!) gauge pipe, and reinforce it where needed.

This being my first detailed look at the exhaust system, I was surprised and a little disappointed to see how heavy a gauge of pipe was used for the original setup. I felt like it was unnecessary on a car this small, especially one that's going racing. At the time it was built, I wasn't very involved in the build process of the car beyond writing checks to the pros (a lot has changed since then). If I knew then what I know now, I would've specified things a bit differently. At any rate, I'm glad to now have the opportunity and ability to do it my way.

The rust colored stuff there is weld-through primer. That Magnaflow muffler is a straight through design, effective and quiet enough, but kind of heavy. I may need to address that someday in the future. Maybe fab up my own muffler and get a chance to use all of those titanium shavings I've been saving.
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post #517 of 764 (permalink) Old 12-09-2014, 12:47 PM Thread Starter
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With the old exhaust system, my car was relatively quiet. Maybe too quiet. shortening up the system by half might make it a little louder, but to guarantee that I get the volume I need, I decided to fabricate and install a megaphone.

The old exhaust system had several bends to get it up and around the rear axle. Don't need those anymore, so I was able to repurpose a section of bend to point the exhaust out the side. Retaining the muffler will keep the volume from being painful, but I still need to share with the world the beautiful music of an Alfa Nord race engine at full song.
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post #518 of 764 (permalink) Old 12-09-2014, 12:54 PM Thread Starter
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Exhausted!

And here it is, ready to be sent out for ceramic coating. What I haven't shown you are the many hours of fittings and re-fittings, fabricating brackets/hangers, and other little odds and ends.
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post #519 of 764 (permalink) Old 12-17-2014, 08:53 PM Thread Starter
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Got the pieces back from ceramic coating. It was just the header, collector, and megaphone that were treated. They get sandblasted, then coated inside and out. I sprayed the muffler with Rustoleum High Heat spray paint. Perfect match!

This is how it lays out. Tomorrow I'll see if I can get a YouTube video of the noise , I mean, music it makes. I don't know yet myself, it was getting kind of late when I finished buttoning it up. So I haven't run it. It will need a few heat cycles to help the ceramic coating cure.
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69 Spider, 2L, street; pursuit of happiness
69 Spider, 1.8L, race; happiness of pursuit

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post #520 of 764 (permalink) Old 12-18-2014, 10:47 AM
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Lovely stuff! Looks like art to me.

Larry

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post #521 of 764 (permalink) Old 12-18-2014, 07:33 PM Thread Starter
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Thanks, Larry. I agree, I think the bundle of snakes look is great. Here are the headers in situ. The finish is satin black. It will probably dull after a few heat cycles. I'm glad to lose those hose clamps. Someday, I'll turn my attention to the top of that ratty looking steering box.
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post #522 of 764 (permalink) Old 12-18-2014, 07:50 PM Thread Starter
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I promised a YouTube clip of the exhaust note, and here it is. Unfortunately, the days up here are incredibly short and it got dark by about 3:45 PM. So the quality of the video isn't great. Also, it was raining, so I kept the front open half of the car in the garage which makes the engine noise reverberate. With the hood up, it sounds like a diesel.

Exhaust note now is mellower, and a bit louder as expected. Maybe even angrier than before.


69 Spider, 2L, street; pursuit of happiness
69 Spider, 1.8L, race; happiness of pursuit
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post #523 of 764 (permalink) Old 12-19-2014, 03:30 PM
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Exhaust note

Sounds very nice
look forward to seeing and hearing it next season

Neil



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post #524 of 764 (permalink) Old 12-19-2014, 06:54 PM
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Sounds great when revved!
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post #525 of 764 (permalink) Old 12-20-2014, 07:38 AM
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The carbs need to be syncronised.....

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