PFF - Pennock's Fiero Forum, PDA Edition

The Turbo 3500 F23 swap (Page 44/80)

ericjon262

AUG 13, 09:40 PM

quote

Originally posted by pmbrunelle:

Does this mean that the thermal cameras only measure the intensity of one particular color of light?

If the camera measured a few colors, and had an idea of the spectrum, then the temperature reading would be independent of intensity.

I don't know, it's not really something I have ever given any real thought to.

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Will

AUG 14, 07:38 AM

quote

I think it's looking at total incident energy within a range of wavelengths. Under ideal conditions that variable would be monotonic with temperature, but would also be dependent on view factor among other variables.

I've worked with a very experienced engineer who uses a thermal camera to observe the first power-on of any new circuit board design. He says he's seen his own reflection on the boards and has to take steps to make sure that reflections don't obscure the data.

[This message has been edited by Will (edited 08-14-2019).]

ericjon262

AUG 21, 01:24 AM

Stainless headers didn't get my order for the flanges somehow... oh well, I'll get the flanges on order and make this happen. as of now, the only parts I need to make the new turbo manifolds are the missing flanges, filler material, and a purge kit or solar flux.

the TB flange I drew up fits great, the plan is to make a new intake similar to my old one, this time though, making sure it doesn't end up warped. I have a few tricks up my sleeve for that, more to come later.

Unfortunately, I won't be able to make any real progress on the car for at least the next month and a half, but probably more like 3 months, gotta earn my Submarine pay...

pmbrunelle

AUG 21, 06:27 PM

I was reading that WW2-era submarines kept a lathe on board for doing maintenance / repairs... that could be good for making some parts for the car project.

Do submariners have free time while underway? Maybe you could draw plans / wiring diagrams...

(I am not a sailor, so I don't know how it is)

ericjon262

OCT 21, 12:59 AM

quote

Originally posted by pmbrunelle:
I was reading that WW2-era submarines kept a lathe on board for doing maintenance / repairs... that could be good for making some parts for the car project.

Do submariners have free time while underway? Maybe you could draw plans / wiring diagrams...

(I am not a sailor, so I don't know how it is)

we have one on board, but it's only there for emergency usage. I don't get much free time, some people do, but mostly the guys in the forward compartments. engineering department doesn't usually get that lucky.

I have most of the plans in my head still, I should probably write them down. as well as get the wiring diagrams figured out. most of it should be straightforward.

I planned on starting the exhaust started, but the flanges I have are a little bit too far off, I'm going to draw something up and have a someone local to me cut new flanges on a CNC table, hopefully they will be closer than what I currently have. I'm still planning on weld el's with a nice long taper to from the port diameter to a 2" discharge.

with my current work schedule I probably won't meet my goal of driving by the end of the year, but hopefully I can at least get the engine back in the car.

ericjon262

OCT 27, 12:56 AM

I got started on a new set of turbo manifolds.

the forward most ports will use 90* bends. and the downstream ports will use 45*, contoured to the pipe. the main log is tapered from the 1.5" 90*, to a 2" discharge at the end. I plan to use a V-band at each discharge, and I might weld in EGT bungs, but probably not. the taper is accomplished by cutting a long V down the length of a straight piece of tube, and then clamping the wide end to reduce the diameter. the whole manifold is schedule 10, 304 stainless.

the flanges pictured won't be used though, they don't quite fitup as well as I hoped they would, and will end up being too much work to make fit, and seeing as I've tried the only two off the shelf parts, it's time to get a little more personal...

I really didn't want to draw my own, as I knew it would be a tedious process, and it was, because the port is in no dimension uniform.

I have a few more tweaks to make before it's done, but there's a guy local to me with a plasma table who has offered to cut them for me.

ericjon262

OCT 27, 04:06 AM

I re-drew the header flange from square one, the only dimension in question at this point, is the distance between the port, unfortunately, I don't have a accurate instrument that large, but they should be very close. the port outline is looks to be damn near perfect at this point, and I should no longer have any interference issues with the schedule 10 pipe either.

pmbrunelle

OCT 27, 08:55 AM

quote

Originally posted by ericjon262:

I re-drew the header flange from square one, the only dimension in question at this point, is the distance between the port, unfortunately, I don't have a accurate instrument that large, but they should be very close.

Why wouldn't you use three separate flanges; then you wouldn't need accurate measurements of the distance between the ports. You could bolt the flanges on a head, and weld everything up. When I followed this procedure, I used counter-sunk head screws, to center the holes in the flanges with the screw thread centerlines.

What is the reasoning to having one large piece with the strip of metal connecting the ports?

ericjon262

OCT 27, 11:50 PM

quote

Originally posted by pmbrunelle:

Why wouldn't you use three separate flanges; then you wouldn't need accurate measurements of the distance between the ports. You could bolt the flanges on a head, and weld everything up. When I followed this procedure, I used counter-sunk head screws, to center the holes in the flanges with the screw thread centerlines.

What is the reasoning to having one large piece with the strip of metal connecting the ports?

I could, it's not uncommon in the V8 world, I would prefer them joined because then I don't have to have them bolted to the head to verify fitup of parts. I acquired a very large vernier caliper today that I am going to use to check the measurements, then I'll either have a flange cut out of sheet metal to verify, or print it out on paper and cut it out.

pmbrunelle

OCT 28, 11:49 AM

Another possible advantage of the metal connecting strip occurred to me.

As the log manifold heats up (I'm really talking about the tapered slit tube), it will grow lengthwise. The cylinder head on the other hand, having a much smaller temperature rise, will maintain a relatively constant length.

The length mismatch that will occur between the parts may be resolved by consequences such as shearing the bolts, or sliding on the gaskets.

If your log manifold has a connecting strip that remains relatively cool, it will force the distance between the ports to remain more constant.
However, there will be more stress within the manifold itself.

[This message has been edited by pmbrunelle (edited 10-28-2019).]