Roman's 4GR V6 Carina discussion thread

[xsspeed]

also, turbo noob at printing, and particularly metal, but assuming your intake gets built from bottom up - how does this detail in blue get made? does it build a 'dummy structure' to be removed later (forget what thats called) or is this what goat was asking

[Roman]

It lays down layers of metal powder, then a laser comes and zaps all of the parts it wants to hold together. 
Then puts down another super thin layer of powder and same again.
So it doesnt need any support material, or less so, because everything is held up by the powder. 

Have a look here it's quite interesting.
 

 

[tortron]

Rad, wonder if I can make a finned side valve head out of that. The cast ones need full finishing anyway

What a time to be alive

[mjrstar]

Holy shit the future is here. Weird elevator music in that video though..

 

Just need ai to dream up the parts and drones to deliver them.

[GARDRB]

 

This guy is doing some pretty sweet stuff with 3D printed metal

[yoeddynz]

On 02/07/2024 at 07:28, mjrstar said:

Just need ai to dream up the parts and drones to deliver them.

 

[Rhyscar]

Man parts look so good. Pic of your intake looks like a SW render! Excited to do some and keep seeing how this progresses. 

[VitesseEFI]

15 hours ago, Rhyscar said:

Pic of your intake looks like a SW render

‘Cause it is…. Just rendered in aluminium. Actually awesome!

[tortron]

You could use press in threaded inserts for those rod and nut bits

Press in from the bottom, pick one with a lip

Probably fine

[Hyperblade]

Your heading down the right path, anything being removed often from aluminum should use a stud. Alternative is a helicore type system.

Rather then trying to beef up the design to suit, solve it how oem do (e.g. K20 has studs for manifolds)

The benefit of a stud is you can also have a shank (smooth larger portion more accurate in size then threads) on it for correct alignment of the throttles to the manifold (again like oem).

Looking awesome, love following your process/progress.

[shrike]

Any plans to go back to DBW later on?

Great progress, how far from firing it up again? just the fuel rail machining?

[GARDRB]

10 hours ago, Roman said:

 Exhaust VVT pulleys are 1.2kg each which is stupidly heavy.
So unless they're giving some exceptionally good power or economy gains, they'll likely go in the bin for some lighter fixed pulleys at some point.
Definitely do everything possible to keep the intake side VVTI though, which has been well proven to earn it's keep.

Pussy, do some 3d printed titanium VVT pulleys

[Roman]

On 23/07/2024 at 11:32, shrike said:

Any plans to go back to DBW later on?

Great progress, how far from firing it up again? just the fuel rail machining?

Yes definitely keen to have DBW. 
I've found an ethrottle setup that is used on bulldozers etc where it is an ethrottle motor that pulls a pair of cables. So I could probably get this linked up to each bank but only one H bridge which would be good. 

Yeah I need fuel rails machined, then the vvti pulley caps sorted. 

Then should be able to fire up once back together.

Still need to finish the exhaust properly but most of my driveway is currently ripped up waiting on some new concrete. So cant push the car back out at the moment.

[GARDRB]

2 minutes ago, Roman said:

I've found an ethrottle setup that is used on bulldozers etc where it is an ethrottle motor that pulls a pair of cables. So I could probably get this linked up to each bank but only one H bridge which would be good. 
 

Then you could run a Caterpillar windscreen banner

[nick_m]

awesome man. Who are you using for printing?

with those fuel rails did you ream the o ring seat ? 

[Roman]

3 hours ago, nick_m said:

awesome man. Who are you using for printing?

with those fuel rails did you ream the o ring seat ? 

Printed by craftcloud3d website. 

I havent had the rails machined yet, as Dad's CNC is out of action. 
However we have a tool path already loaded into it as we did my other fuel rails on same machine the same way.
I undersized the injector holes by 2mm so I can them machined to the correct diameter.
Then same for the fuel feed at the back of the rails.

[Hemi]

On 01/07/2024 at 08:36, Roman said:

@Willdat? Craftcloud3d.com 

You can upload a model, and then it spits back out a list of options/materials/prices from a whole bunch of different vendors. 
No need to talk to any sales people and have to politely explain you cant afford to spend 3 million dollars on printed titanium engine block... haha.

Quoted a m18 battery thing to use m18 as just a noirmal battery.
$900 in titanium. fuck yes.

 

[Yowzer]

Soooo when you gonna get some high comp pistons and titanium camshafts printed?

[Roman]

Ahh so I looked into the idea of printing pistons. 

Porsche 3d printed some pistons on one of their cars so there are some papers about it. 

The tensile strength is somewhere in between cast material and forged. 

But it takes so much post processing to cut the piston ring grooves, hole for the pin and all that. 
That it's probably just as much effort to start with a billet slug and mill it down.

titanium camshafts would be cool though. Ha! Although I think stainless is still the best material.

[Yowzer]

That's quite interesting on the tensile strength. In theory you could print cylinder heads, right? How lols would it be to whip up some 4AGE heads for it!