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Scale 4x2 and Buggy R/C vehicles This is the place to put your Sand Scorchers, Bajas and other various 2wd offroad R/C's


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  #46  
Old 06-06-2016, 06:55 PM
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lilsami87 lilsami87 is offline
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Wow, thats exactly what it was missing! This thing keeps gettin better. Definitely goin to need to build one now!!!keep it up man!
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  #47  
Old 06-08-2016, 11:27 AM
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Junkyard Stance Junkyard Stance is offline
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Originally Posted by lilsami87 View Post
Wow, thats exactly what it was missing! This thing keeps gettin better. Definitely goin to need to build one now!!!keep it up man!
Hey lilsami87 ! - Glad you're enjoying the build - plenty more to come !
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  #48  
Old 06-08-2016, 11:42 AM
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Default Junkyard Stance Sand Scorcher, Flat six engine block

The heart of any engine has to be the block, in this case a flat six, air-cooled unit that takes inspiration from the boxer block used in the Porsche 911 for decades

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Here's the first 3D printing of the Engine Block - the minimum wall thickness on this material is .7mm, I tried to match that minimum on the cooling fins.

On the upper facing sides you can see fixing holes for the Fan Cowling, and locating holes for the Induction System:

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On the underside I included the exhaust manifold with the Engine Block, but I have planned a custom Sump Guard, probably in a cast metal:

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Here's the Engine Block in primer:

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Here are the two fixing holes for the next part - the Fan Cowling - accessible through the sump hole:

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They need enlarging to suit the chosen hardware -

for an M1.6 screw, I enlarge with a 1.2mm bit
for an M2 screw, I enlarge with a 1.6mm bit

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Here's the fixing screw from the outside, this screws in to the next component, the Fan Cowling

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Last edited by Junkyard Stance : 06-08-2016 at 01:01 PM. Reason: spelling
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  #49  
Old 06-08-2016, 11:58 AM
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Default Junkyard Stance Sand Scorcher, Fan Cowling

To keep that Engine Block cooled, most air-cooled engines rely on a crank driven fan that draws air across the fins on the Engine Block.

Here's my custom design for my flat six Fan Cowling that both supports the fan itself, and directs air flow over the Engine Block

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And the printed prototype,

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and from the front

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Here's the same part in primer, the center hole is for mounting the Fan and Timing Belt parts

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On the other side, you can see the fixing hole for the next part, the Induction System

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Down each side of the Fan Cowling, the are three locating holes - six, one for each cylinder - that fits the bottom of the Induction System

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From above:

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Here's the Engine Block and the Fan Cowling, on the underside you can see its fixing holes

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These needed the customary enlarging for my chosen M2, 8mm hardware

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From inside the Engine Block, here are the tighten button head screws securing the Fan Cowling

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Last edited by Junkyard Stance : 06-08-2016 at 01:03 PM. Reason: spelling
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  #50  
Old 06-08-2016, 12:00 PM
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Default Junkyard Stance Sand Scorcher, Fan Cowling

Here's a few of the first two engine parts, fitted together:

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Last edited by Junkyard Stance : 06-08-2016 at 01:04 PM.
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  #51  
Old 06-08-2016, 03:35 PM
walter walter is offline
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this is very cool
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  #52  
Old 06-09-2016, 03:52 AM
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this is very cool
Thanks walter ! - check back again sometime, there's some cool updates coming
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  #53  
Old 06-10-2016, 12:14 AM
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Default Junkyard Stance Sand Scorcher, the Induction System

Sitting on top of the Engine Cowling, the Induction System receives the hot, pressurized air from the Turbo Exhaust, directs it through the Inter-cooler Mesh and then feeds it into to the cylinders via the carburetors or injection system.

Fuel and Nitrous is added, and the mix ignited !

My forced air Induction System is made from three separate parts ( mainly for ease of painting - though more would have been easier ! )

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The Induction System

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The Inter-cooler Mesh

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And the Inter-cooler Lid

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As usual, I enlarged the pilot holes in the printed pieces - with a 1.2mm bit for the Induction System

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And with a 1.6mm bit in the Inter-cooler Lid ( the screws shouldn't bite into this part)

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Here are the three parts, ready to fit together, using four 6mm M1.6 shinny cap heads

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And a close up of the Inter-cooler Mesh, sandwiched between the Induction System and the Inter-cooler Lid

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On the underside, in amongst the fuel and nitrous pipes, you can see the fixing hole for the Induction System

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This was enlarged with a 1.2mm bit, to receive an M1.6 16mm screw

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  #54  
Old 06-10-2016, 12:29 AM
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Default Junkyard Stance Sand Scorcher, the Induction System

In the Fan Cowling, there is a buried fixing hole that needs enlarging - as I was using an M1.6 screw, and didn't want it to bite into this part - I enlarge with the same size drill bit, 1.6mm

the fixing hole is access through where the Cooling Fan will eventually sit

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Here it is, with the screw in place

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and from the outside - when the Induction System is in place, this will hold it tight to the Fan Cowling and Engine Block

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Here's the flat six engine in progress

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From round the back ( or front, depending on your perspective on rear engined cars ! ) - I've tried to sculpt the rear of the assemble to fit tight to the stock motor/gear casing

I was keen to build and entire engine model, not just a "facing" that surrounds the stock parts, even if that means it sticks out a bit too far

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A few more of my work-in-progress Junkyard Stance twin turbo Porsche flat six engine

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  #55  
Old 06-10-2016, 05:55 PM
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nice job looks very good
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  #56  
Old 06-12-2016, 08:50 AM
rustneversleeps rustneversleeps is offline
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very nice.... do i just go to shapeway to get these parts...
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  #57  
Old 06-12-2016, 09:32 AM
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nice job looks very good
Cheers walter, nice to have feedback !
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  #58  
Old 06-12-2016, 09:35 AM
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Junkyard Stance Junkyard Stance is offline
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very nice.... do i just go to shapeway to get these parts...
Hi rustneversleeps, Thanks !

When I've opened my Shapeways shop, you will be able to order the custom parts, they get printed, and are sent direct to you.

When the shop is open, I will post here first !
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  #59  
Old 06-12-2016, 09:47 AM
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Default Junkyard Stance Sand Scorcher, Porsche Cam Covers

Next up, some Cam Covers - as my flat six engine design is loosely based on the 911 unit, I descided to go for some Porsche embossed Cam Covers - my designs:

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Here's the white nylon printed part

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Eventually, I may go for one of the higher res materials, but for this first fitting, all the engine parts I'm testing, I've had printed in the most economical material, the "Strong and Flexible" white nylon

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In primer

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The usual enlarging of the printed pilot holes

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to accept the M2 button caps I'm using

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The Cam Covers, fitting the the Engine Block

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I'm pleased with the fit

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The growing boxer engine

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  #60  
Old 06-12-2016, 10:03 AM
Trini2DBone Trini2DBone is offline
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Wow...! Serious drool happening here...

Awesome!
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