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Endeavor

Sectioned and Channeled Pocher Alfa Spyder

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Pouln -  Thanks for the kind words.

 

I began work on the engine and the steering box so that I can finalize the dimensions, shapes, and positions of the firewall, dashboard, cockpit floor, body, radiator shell, and fenders.

 

I'm still deciding how much detail to include on the engine and steering box.  I want to get back to the body and fenders, as that is my primary focus.

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I fixed one more inexplicable Pocher error.  

 

Like the camshafts, the 8C 2300's blower is driven from the center of the engine. The housing for the blower drive protrudes from the right side of the engine.  Although Pocher got the position and shape of the blower drive right, the drive does not protrude far enough and so does not mate properly with the blower.

 

In the photograph below, you can see that the plate that connects the blower to the drive protrudes a bit more than 2mm outward of the drive.

 

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I made a vertical cut through the blower drive so that a styrene piece, about 2.25mm wide, could be inserted to extend the drive outward.

 

The photograph below shows tape applied to the drive to mark the location of the cut.

 

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As always, the cut was made with a flush cutting saw.

 

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Below you see the styrene piece "welded"  into position.  A bit more work with files and sandpaper will be required to finish the job.

 

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The blower now mates up properly with the blower drive.

 

Notice that although Pocher got the horizontal dimension wrong, now in its proper position, the shape of the blower drive matches the blower assembly perfectly.

 

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Staggering amount of detective work to uncover all the things that divert from reality. It speaks to the many hours of just studying the parts and comparing to references. Then you must figure out a fix.

Enough cannot be said of your skills, tenacity and obvious passion for this project.

To say nothing of your sharing and providing a road map for interested, advanced Pocher Alfa builders.

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Posted (edited)

I had a go at the same modification for my Alfa but I don't think it's anywhere as neat as yours.

 

46954213785_588a00d745_b.jpg

 

The other mod I tried was widening the front nose behind the front engine mounting plate. Looking at the reference photos I thought this was deeper than on the Pocher block so I packed out the engine plate. This also helped me with moving the engine back, although I didn't go for the full 10 mm, more like 7 mm

 

Not sure it applies to your build but I also made up the vent for the gearbox I saw in reference photos of the Alfa

 

47870406471_c8ffd50601_b.jpg

 

 

33993187908_4eec7102ef_b.jpg

 

 

Following your work with admiration.

Edited by Frogeye

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16 minutes ago, Frogeye said:

I had a go at the same modification for my Alfa but I don't think it's anywhere as neat as yours.

 

Also wonderful work. We can never have too many obsessed Pocher builders...and yes, David's work is surgical.

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25 minutes ago, Frogeye said:

I had a go at the same modification for my Alfa but I don't think it's anywhere as neat as yours.

Looks good to me.

25 minutes ago, Frogeye said:

The other mod I tried was widening the front nose behind the front engine mounting plate. Looking at the reference photos I thought this was deeper than on the Pocher block so I packed out the engine plate. This also helped me with moving the engine back, although I didn't go for the full 10 mm, more like 7 mm

Thats an interesting idea.  I opted to move the front cross member back.  It was not difficult.

 

Actually, I think 7mm is about right for the Spyder.

25 minutes ago, Frogeye said:

 

Not sure it applies to your build but I also made up the vent for the gearbox I saw in reference photos of the Alfa

 

Thanks for posting this.

 

 I'm happy that someone might actually find the thread to be useful.

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11 hours ago, Endeavor said:

 I'm happy that someone might actually find the thread to be useful.

Don't worry! Although I'm not building Pocher kits I still find reading about the way you solve all those problems very educational. 

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