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Author Topic: MeXXspeed NBAC Billet crank  (Read 8611 times)
MeXX
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Posts: 526


World record holder 8.733 @ 255.658
« on: May 16, 2014, 21:21:16 pm »
Hi

After I broke my crank last year I had to realize that I'm in the need of a stronger solution.
Now 8 month later I'm more then proud to release my new designed NBAC billet crank.

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just for comparison NBAC vs of the shelf Scat billet crank.

Keep on cranking

MeXX
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johandryselius
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« Reply #1 on: May 16, 2014, 21:31:55 pm »
Mexx!
VERY nice as also your billet heads! Any new times set yet!?
Smiley
Johan
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1600cc Challenge Porsche 356:
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1600cc Challenge Buggy:
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MeXX
Hero Member
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Posts: 526


World record holder 8.733 @ 255.658
« Reply #2 on: May 16, 2014, 21:48:48 pm »
Stepping up to larger 65mm main bearing the overlap between main and rod journal was increased from 7.9mm to 10.4.Which is basically even more than a 84mm stroke crank  Roll Eyes Roll Eyes
The main journal radius was increased to 3.2mm. The webs between main journal #3 and rod journal #1 & #4 were increased in thickness from 8.83mm to 9.87mm and in width from 78.15mm to 104.83mm resulting in a square area increase of 50%.

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« Last Edit: February 21, 2021, 18:40:01 pm by MeXX » Logged
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MeXX
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Posts: 526


World record holder 8.733 @ 255.658
« Reply #3 on: May 16, 2014, 21:58:27 pm »
Even the thick webs were increase slightly to gain rigidness.
The oil bores for the rods were reduced to reinforce the webs and to gain bearing surface.

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MeXX
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MeXX
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Posts: 526


World record holder 8.733 @ 255.658
« Reply #4 on: May 16, 2014, 22:03:28 pm »
I'm very proud to have two of this beauties for my new engines and that the first crank for a customer is in production right now and will be delivered soon.

So long

MeXX
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bedjo78
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« Reply #5 on: May 17, 2014, 00:42:31 am »
That is amazing
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dangerous
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« Reply #6 on: May 17, 2014, 03:58:43 am »
Nice design work Mexx!
Love the curves and extra material right where it needs to be!

I went for 4mm radii and 2.75"(about 70mm) mains on mine.
2.2" (about 56mm)rod journals and only 82.5" stroke.

I did mine old school, on non-cnc and it took 90hours!  Roll Eyes
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wph
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Posts: 94
« Reply #7 on: May 17, 2014, 07:50:11 am »
Slightly off topic but:

Mexx and dangerous, how did you model counterweights and balancing ? My cousin has a back burner project for his
inline Ford engine for which he'd like to machine a stroker billlet crank.

Pekka
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jaqo
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Bugster Team
« Reply #8 on: May 17, 2014, 11:32:37 am »
Great work Mexx, as allways

Quote from: dangerous on May 17, 2014, 03:58:43 am
and only 82.5" stroke.
Wow:D:D
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richie
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Posts: 5624
« Reply #9 on: May 17, 2014, 13:07:01 pm »
Quote from: MeXX on May 16, 2014, 21:21:16 pm
Hi

After I broke my crank last year I had to realize that I'm in the need of a stronger solution.
Now 8 month later I'm more then proud to release my new designed NBAC billet crank.

[ Attachment: You are not allowed to view attachments ]

[ Attachment: You are not allowed to view attachments ]

[ Attachment: You are not allowed to view attachments ]

[ Attachment: You are not allowed to view attachments ]
just for comparison NBAC vs of the shelf Scat billet crank.

Keep on cranking

MeXX



Hi Mexx

very nice Cool, are you making them yourself or having them made to your specs?  with a 60mm main bearing will they fit into a type 1 case or does it need to be something like Pauter? what bearings will it use? what do you use for the thrust?

cheers Richie
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Cars are supposed to be driven, not just talked about!!!   


Good parts might be expensive but good advice is priceless Wink
MeXX
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Posts: 526


World record holder 8.733 @ 255.658
« Reply #10 on: May 18, 2014, 07:00:12 am »
Quote from: richie on May 17, 2014, 13:07:01 pm
Hi Mexx

very nice Cool, are you making them yourself or having them made to your specs?  with a 60mm main bearing will they fit into a type 1 case or does it need to be something like Pauter? what bearings will it use? what do you use for the thrust?

cheers Richie

Dear Richie

They are made to my spec.
65mm bearings are of the shelf.
The fit T1 with a new line bore slightly smaller than T4.
The of the shelf bearings come with a thrust bearing similar to T1.

will ad a pic soon....

sorry but just got up and it was such a long (great) day yesterdays.

WRH

MeXX
« Last Edit: February 21, 2021, 18:41:15 pm by MeXX » Logged
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richie
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Posts: 5624
« Reply #11 on: May 18, 2014, 08:41:00 am »
Quote from: MeXX on May 18, 2014, 07:00:12 am
Quote from: richie on May 17, 2014, 13:07:01 pm
Hi Mexx

very nice Cool, are you making them yourself or having them made to your specs?  with a 60mm main bearing will they fit into a type 1 case or does it need to be something like Pauter? what bearings will it use? what do you use for the thrust?

cheers Richie

Dear Richie

They are made to my spec.
60mm bearings are of the shelf.
The fit T1 with a new line bore slightly smaller than T4.
The of the shelf bearings come with a thrust bearing similar to T1.

will ad a pic soon....

sorry but just got up and it was such a long (great) day yesterdays.

WRO

MeXX

Hi Mexx

thankyou, now take a break for 1 hour, enjoy what you achieved yesterday Cool  then go work on the car to make it better Grin Cool

cheers Richie
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Cars are supposed to be driven, not just talked about!!!   


Good parts might be expensive but good advice is priceless Wink
Ragtop
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« Reply #12 on: May 18, 2014, 21:33:41 pm »
You are a very talented man!
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MeXX
Hero Member
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Posts: 526


World record holder 8.733 @ 255.658
« Reply #13 on: May 22, 2014, 18:36:51 pm »
Hi

Here are some pix from my bearings.
They are available of the shelf in different materials for different levels of performance

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MeXX
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mr horsepower
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« Reply #14 on: May 22, 2014, 19:22:48 pm »
They look like ford small block to me Mex
Maybe  i am wrong but for me they look like it
Btw congrats with youre achievement on the run
You are writing history

Gr henri
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Shag55
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Shag Leone, SL-1racing
« Reply #15 on: June 19, 2014, 21:36:39 pm »
Another very nice product Mexx!
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Type3s
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Posts: 11
« Reply #16 on: June 20, 2014, 10:25:06 am »
Hi MeXX,

now the good piece lying on my table, awesome!!!!
Thanks for everything, looking forward to the future ....

some pics

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Daniel
« Last Edit: June 20, 2014, 10:29:07 am by Type3s » Logged
UltraOrange67-2443
Hero Member
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Posts: 1034
« Reply #17 on: August 15, 2014, 16:16:06 pm »
Quote from: MeXX on May 22, 2014, 18:36:51 pm
Hi

Here are some pix from my bearings.
They are available of the shelf in different materials for different levels of performance

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MeXX

Hi Mexx,
Can you supply a rear thrust bearing in a T4 outer / inner dia?
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