|Topic Review (Newest First)|
|06-20-2019 12:56 AM|
Originally Posted by jubrele View Post
Next challenge is to deal with the metal hub. I started another thread for that rather than continue to hijack this thread. Thanks all for the ideas and suggestions; there were several thrown out that really helped me get on track.
|06-18-2019 03:39 PM|
|Del||Keep me posted. Will be around.|
|06-18-2019 03:32 PM|
Taking a train up to Seattle this weekend, to my sister and B-I-L's 60th birthday party. I've always wanted to try the Amtrak Coast Starlight route. Bummer is that I get on at midnight!
The trip back should be fun and (provided that the transaction goes off as planned), bringing back another Alfa...but it should NOT be a fixer. Planning on hugging the Sierra Nevada foothills for about 850 miles, another route I've not tried before. I truly detest Hwy 5, so this should be a welcome change. Adds about two hours to the trip, but I'm planning on taking two days.
|06-13-2019 10:36 AM|
|Del||Lol, I cannot live in that kind of weather, having tried it for two years in DC. As you said, 90+F, 1000% humidity. Plus, the allergies I suffer from on the East Coast whenever we visit. One day, and boom, itchy eyes, packed up sinus, sore throat, the works. Something grows there we don't have here, as I have no allergy problems at home. Bought a brand new 78 GTV when we were there because it did not have a/c, which meant that there was no way they were going to sell it to anyone living there. got a nice deal to take it off their hands.|
|06-13-2019 10:12 AM|
|Mark_toro||18% humidity - only in my dreams. the 90 / 90 days (90 degrees 90% humidity) are fast approaching in Nebraska. Thank God the wind always blows!|
|06-11-2019 06:12 PM|
I had a plan for finishing the brakes this evening. It ran into the wall of 108* with 18% humidity in the workshop.
Um, maybe tomorrow. Or, I'll wait until late tonight. Probably not.
|06-07-2019 01:00 PM|
Those sorts of analyses has been done for many decades (as I'm sure you know, of course), and there are many old and new books which discuss intake and exhaust manifolding, and the matching porting in engine heads, with regards the relative airflow in them. Nowadays, computer programs for fluid flow analysis are so sophisticated, much of the design work is done on the computer, only sometimes checked for accuracy afterwards.
Granted much of what you see, esp in older engines, in the way of intake and exhaust piping shapes, and head porting design, have compromises for different subjects, such as manufacturing ease, item cost, and noise reduction. In many cases, these designs can be improved, for a cost, of course. And, it seems that there will likely be at least one drawback somewhere along the way in some aspect in doing so. Complicated subject. Keep in mind, the airflow in and also out of cam controlled reciprocating engines have inherent pulses in them, more or less at different flow velocities, to add to the design mix.
An example of a manufacturer improving an exhaust manifold for higher efficiency appears to be the difference between the 91/92/93 164 cast exhaust manifolds and the 94/95 (and on) 164 tubular steel manifolds. Lighter and one can assume more efficient, albeit somewhat noisier, due to less noise dampening than the cast iron version (I like the work pinino did with his adapting a later 164 tubular exhaust manifold to the earlier 164s).
I've always suspected that the Alfa heads and manifolds have been not all that bad, based on my discussions with Carlo, although assuredly, cleanup/change improvements are possible to a degree. I also suspect some of them are simply feel good exercises, amateur guesses at best.
I am quite sure that you would find that the new engines are far more efficient in their designs than our older Alfas, much better than the 164s we have in the US. The manufacturers have no choice in the matter, given the present day (and upcoming) regulations.
|06-07-2019 11:43 AM|
On reflection, it might just be a pipe dream. Flow in an engine is chaotic, and the velocities vary greatly.
And yet, if you were to calculate the shape based on your max velocity, it should still work at the lower velocities.
Arrrgghhhh. The things that keep my mind spinning.
Perhaps, cut a port in half, port it to shape, provide a spacer that accounts for the material removed, bolt it all back together and then use some flowvis to spray into the port while flowing it on the bench. Lather, rinse, repeat.
|06-07-2019 11:25 AM|
Crazy thought for the day:
How can I apply the Coanda effect to intake port shape...and specifically the short side radius?
|06-07-2019 10:14 AM|
|horsewidower||Fantastic, seals have shipped. We can get back on track next week.|
|06-03-2019 02:40 PM|
|horsewidower||And.....wouldn't you know it, they are on back order. Drat!!|
|06-02-2019 06:36 PM|
I knew I put the caliper-half seals in a "special place". As we all know, when you do that, you don't ever find the part you need until after you've given up and purchased a replacement. So it goes here.
Now after 4 hours of looking, in three different places, I will be making a call tomorrow to order new ones.
Yet again, I think it's time to put a box on a conspicuous wall, with a big sign pointing at said box stating "special place". Maybe with neon flashing lights. Audio should play that repeats "look in here, dummy". Triggered the first time you enter the area, and every hour (minimum) that you stay in the area.
I did find a lot of other items...but I'll forget by tomorrow morning.
|06-01-2019 09:55 PM|
Dave, they are always extremely helpful. I thought that they'd run me out of the place, given the small order I intended to place, as well as the itty bitty o-ring I was looking for. Nope, very congenial gentleman, took all the time necessary to get it done.
Mike, I think you'll like it...it's already running and driving. My son is taking the Acura to Texas, so I need something that works.
Well, today has been a mixed bag. Let's just say that the hubris of easy deconstruction can be balanced by the humility of reconstruction. But after going through the headbanging learning curve, the second caliper should go together much easier, tomorrow. Observation, and attention to detail is so necessary with these cars. Anytime I'm in a hurry, I invariably lose.
I cleaned up a set of rotors, and painted the non-important surfaces to control rust, leaving outside the shop to dry. Only to have an unexpected cloudburst rain on my parade. As a result, more rust removal tomorrow.
|06-01-2019 03:55 PM|
Bob: Without a doubt, it's time for an intervention. You need to go to an Alfaholics Anonymous meeting ASAP!
|06-01-2019 03:35 PM|
Hey Bob, glad you have a Parker store nearby-- Parker Hannifin Corporation's my old alma mater. Hydraulics and pneumatics heaven.
Hope they had EPDM compound rings in stock for you.
Terrific photos too, like always! That insulation wrap on that pipe kickup there is the easiest and best favor a GTV 6 owner can do for that LH caliper.
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