Jump to content

Datsun B310 turbo coupe, A15 project


Atomic

Recommended Posts

  • Replies 1.3k
  • Created
  • Last Reply

Top Posters In This Topic

Top Posters In This Topic

Posted Images

God damn, it took a long time to finish the piece 😄 I did some rookie mistakes and could have been more efficient, but all in all happy with the result, here are some pictures of the 4 days journey:

img_20200630_141150_by_atomicsickness_de

img_20200630_141830_by_atomicsickness_de

img_20200630_164323_by_atomicsickness_de

img_20200630_164337_by_atomicsickness_de

img_20200630_195249_by_atomicsickness_de

img_20200701_094208_by_atomicsickness_de

img_20200701_104240_by_atomicsickness_de

img_20200701_131846_by_atomicsickness_deimg_20200701_151241_by_atomicsickness_deimg_20200701_161453_by_atomicsickness_de

img_20200701_182124_by_atomicsickness_de

img_20200703_093452_by_atomicsickness_de

 

I should have shaped the outer edges of the workpiece first and also face milled the top and bottom too. Oh well, you live, machine and learn. 

 

I still have a stock for another girdle which I'm about to sell in the future

  • Like 3
Link to comment

Steel is 3X stiffer than aluminum. If the point of a crankshaft girdle is support for the main caps why aluminum? It's also weakest where the throws pass by it and seriously thin around the oil pick up tube.

Link to comment
6 minutes ago, datzenmike said:

Steel is 3X stiffer than aluminum. If the point of a crankshaft girdle is support for the main caps why aluminum? It's also weakest where the throws pass by it and seriously thin around the oil pick up tube.

Who said it's aluminum? 😄 lol

 

It's 1.4307 Stainless steel

 

Plus are we really going to pretend it's going to snap there? Maybe my engine needs some other attention if that breaks.

Edited by Atomic
  • Thanks 1
  • Haha 1
Link to comment

And can you spot where other girdles are the thinnest? Look at the bolt hole sections:

18914_Girdle-kit-pentru-motoare-VR6VW-Au

Plus some other ''thin'' walled sections:

engine_dsm_girdle.jpg

dms-mss-1020_xl.jpg

 

I'm very confident that mine will do its job

Edited by Atomic
Link to comment

I will order some aluminum stock so I can start making the new intake manifold system. This time I will machine these intake trumpets so I can use them as adapters for the round 90 degree aluminum pipes for easy weld on. So first these will be welded on to the 90 degree intake pipes, and then to the flange for easy manufacturability:

de0nwes-12fbf1c9-bc79-47cb-8351-633edec6de0nwf6-98439fd5-b277-4a74-bfc9-67b48948

de0nwfh-e5616dc1-612d-4686-937b-ef48c296

de0nwfv-43d4349e-63ac-4c64-9f9e-7104f06d

  • Like 1
Link to comment

Ordered a lot of stock aluminum with 12 mm and 25 mm thicknesses. I'm going to machine new DIY kits for intake manifold sets and put them on sale. 

 

Then I assembled all piston rings and connecting rods. Also started printing prototype parts for strut tower brace. Probably going to make my own adjustable top camber plates too. I also inquired a pricing for a stock aluminum piece to machine valve cover out of it. I'm also going to pick up a lathe with vertical mill attached to it with ton of tools on Saturday. 

 

Hurray for tools! More custom parts incoming! 

  • Like 2
Link to comment
13 hours ago, Atomic said:

I'm also going to pick up a lathe with vertical mill attached to it with ton of tools on Saturday. 

 

Hurray for tools! More custom parts incoming! 

 

This might be getting way out of control... but what the hey! Down the rabbit hole we go!!! 🐇🤪

  • Like 2
  • Haha 1
Link to comment

Pistons ringed as told previously:

img_20200707_175542_by_atomicsickness_de

 

3D printed electronic box for the expansion board and AD converters for the temperature sensors:

img_20200708_161701_by_atomicsickness_de

img_20200708_162908_by_atomicsickness_de

 

Also assembled the camshaft:

img_20200708_174016_by_atomicsickness_de

 

I made an oopsie with the main cap bearings and one of the thrust bearings got damaged... New set will arrive next week

 

Link to comment

Got the lathe and made weld on steel adapter for the oil pickup tube:

img_20200712_202600_by_atomicsickness_de

Then I received aluminum shipment for future builds:

img_20200713_154925_by_atomicsickness_de

Then I took off some material from the oil adapter as it didn't fit with the socket:

img_20200713_170114_by_atomicsickness_deimg_20200713_170129_by_atomicsickness_de

More cleaning to do in the garage so I can fit all the machines:

img_20200713_173612_by_atomicsickness_de

img_20200713_173647_by_atomicsickness_de

Then I prototyped a blockoff plate for the distributor opening, I will machine the real one out of aluminum and put couple of them for sale:

img_20200713_182851_by_atomicsickness_de

 

 

  • Like 2
Link to comment
21 hours ago, Atomic said:

Got the lathe and made weld on steel adapter for the oil pickup tube:

img_20200712_202600_by_atomicsickness_de

Then I received aluminum shipment for future builds:

img_20200713_154925_by_atomicsickness_de

Then I took off some material from the oil adapter as it didn't fit with the socket:

img_20200713_170114_by_atomicsickness_deimg_20200713_170129_by_atomicsickness_de

More cleaning to do in the garage so I can fit all the machines:

img_20200713_173612_by_atomicsickness_de

img_20200713_173647_by_atomicsickness_de

Then I prototyped a blockoff plate for the distributor opening, I will machine the real one out of aluminum and put couple of them for sale:

img_20200713_182851_by_atomicsickness_de

 

 

 

Did we discuss that there's a way to run a much larger output volume L series oil pump on the A series??? It keeps the A series top but uses the longer L series trochoid rotor and a modified shaft.

 

6233.jpg

 

10266.jpg

 

Needs a lengthening of the body spacer. Pressure is the same or regulator can be shimmed but the extra volume raises the pressure at idle and very low speeds.The oil feed for the turbo will lower the idle pressure slightly, this will bring it back and then some.

 

There is a high volume pump for the L series and my hot idle pressure jumped from 17 to 29 PSI while keeping the original 55-60 PSI when revved up..

 

This is certainly in your wheelhouse.

Link to comment
14 hours ago, datzenmike said:

 

Did we discuss that there's a way to run a much larger output volume L series oil pump on the A series??? It keeps the A series top but uses the longer L series trochoid rotor and a modified shaft.

 

 

Needs a lengthening of the body spacer. Pressure is the same or regulator can be shimmed but the extra volume raises the pressure at idle and very low speeds.The oil feed for the turbo will lower the idle pressure slightly, this will bring it back and then some.

 

There is a high volume pump for the L series and my hot idle pressure jumped from 17 to 29 PSI while keeping the original 55-60 PSI when revved up..

 

This is certainly in your wheelhouse.

 

Yes we did and its almost completed. I need to find new pins and drill couple of holes to L series shaft 

  • Like 2
Link to comment

Got the drill press attached to the lathe too:

img_20200715_160336_by_atomicsickness_de

Started assembling the engine:

img_20200715_170828_by_atomicsickness_de

Had to drill a bit with 11 mm drill bit to make the socket fit with the ARP bolts with some excess threads. Lathe made this really easy:

img_20200715_173428_by_atomicsickness_de

Bottom end torqued to ARP specs:

img_20200715_174513_by_atomicsickness_de

Had to file the girdle a tiny bit because the new rods had different kind of ARP studs, which had a tiny bit longer head length:

img_20200716_151844_by_atomicsickness_de

All pistons assembled and engine spins nicely:

img_20200716_160052_by_atomicsickness_de

 

I'll be tinkering with new HALL sensor mounting spot and I will be making a camshaft trigger too for sequential fuel injection. As I don't want to flood the whole intake manifold with batch firing with excess fuel now that I have 750 cc injectors

 

 

 

 

 

  • Like 4
Link to comment

Made an aluminum camshaft sensor weld on bungle:

img_20200717_134425_by_atomicsickness_de

img_20200717_141054_by_atomicsickness_de

img_20200717_141058_by_atomicsickness_de

I also made a single tooth cam trigger by using the camshaft spacer:

img_20200717_161646_by_atomicsickness_de

img_20200717_161917_by_atomicsickness_de

img_20200717_162340_by_atomicsickness_de

I'm still waiting for a M12x1 tap so I can make the threads for the bungle. Also I'm waiting for 10K potentiometers so I can fix my TIG current scale

  • Like 2
Link to comment

Batch fire squirts 1/2 the fuel every turn of the engine but all injectors fire together. I don't think they run richer it's maybe just simpler, not necessarily better. It's old technology EFI. 

 

Most definitely post up some pictures of the oil pump build.

Link to comment
24 minutes ago, datzenmike said:

Batch fire squirts 1/2 the fuel every turn of the engine but all injectors fire together. I don't think they run richer it's maybe just simpler, not necessarily better. It's old technology EFI. 

 

Most definitely post up some pictures of the oil pump build.

With larger injectors I don't want the intake runners to be completely wetted with batch injection as they fire even when the intake valve is not open. Plus I believe this helps out with larger injectors and injector dead times?

 

Sure I will, I had a friend of mine to dismantle the A15 shaft and drill new holes as I didn't have the equipment I have today available. The set has been hanging in his workshop for a while as I was in no hurry. I should probably go get it and finish it by my own. The only problem is the hardened steel shaft and the 3 mm holes I have to drill. Meaning I have to buy a 3 mm carbide drill most likely.

Edited by Atomic
  • Like 1
Link to comment

Now that you're all setup to create; here's a few B310 items you can try: a solid aluminum steering bushing and an aluminum idler bracket that's been modified with two bearings instead of bushings. After that, look into making a splined sway bar setup for the front and rear.

idler arm.jpg

steering.jpg

  • Like 1
Link to comment

Sprayed the copper gasket with some copper gasket spray to get a good adhesion for the oil and water ports:

img_20200719_102150_by_atomicsickness_de

Cylinder head torqued down:

img_20200719_105315_by_atomicsickness_de

Also started to prototype one of those rocker shaft floating spacers (also found from ebay:)

s-l1600.jpg

 

I will make couple of these of my own as they are quite "expensive" on ebay. And it's a good practice to hone my skills on the lathe anyways. I'm probably going to anodize them black when they're ready.

Link to comment

Had to order new rocker shaft as it was completely busted with deep scratches, same with the other motor rocker shaft?? Is it due to oil starvation or something?

img_20200719_144414_by_atomicsickness_deimg_20200719_193102_by_atomicsickness_deimg_20200719_193618_by_atomicsickness_de

Coupled couple of rocker arms to be replaced from the other kit too and stacked them on top of the busted ones:

img_20200719_194404_by_atomicsickness_de

 

 

Link to comment
On 7/18/2020 at 12:23 AM, Atomic said:

With larger injectors I don't want the intake runners to be completely wetted with batch injection as they fire even when the intake valve is not open. Plus I believe this helps out with larger injectors and injector dead times?

 

Sure I will, I had a friend of mine to dismantle the A15 shaft and drill new holes as I didn't have the equipment I have today available. The set has been hanging in his workshop for a while as I was in no hurry. I should probably go get it and finish it by my own. The only problem is the hardened steel shaft and the 3 mm holes I have to drill. Meaning I have to buy a 3 mm carbide drill most likely.

 

Functionally, your intake runners will be wetted anyway because at high speed the runners will have a constant stream of fuel pulses spraying on them anyway.

 

The sequential is good for individual cylinder tuning.

Link to comment

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

Loading...
×
×
  • Create New...

Important Information

By using this site, you agree to our Terms of Use.