Thread: CAD Drawing for the Gen V M90 output Flange...

I do not have experience with the real CAD programs that CNC machines work with but I am pretty good with Sketchup. I did a to scale (as best I could) drawing of the mounting surface of the M90 and I was wondering if anyone knew how to turn that into a file that a cnc machine could read?

Background on what I am trying to accomplish...
I have a 240sx KA24DE engine that I am going to remote mount the M90 onto the exhaust side of the engine. I want to cnc a flange that will bolt up to the bottom of the M90 (minus all the coolant holes) and extend into the supercharger just enough to seal off the silencer holes and only leave the triangle outlet for an opening. I was then going to modify a 3" pipe to weld directly onto the triangle outlet and drill in a tee for the 1 1/2" bypass line to go back into the charger.

I have attached a screenshot of the Sketchup File but if someone knows how to transfer it to CNC code then I can e-mail the file to them.

Thanks for the help,
Zac

Sounds like a great project, I have heard of people making these to go onto Northstar motors. If I had access to a cad program still I would help you out!

Thanks...It is my VERY slowly evolving project Fellow 240 owners are getting 250hp 250tq out of the M62 so I am hoping to get around 325/325 out of this setup.

Zac

Originally Posted by 99PGPGT

and i need to know what size stock you are starting from

Dude you rock. I will get all the dimensions from the Sketchup drawing and post them here for you. As for stock material to start from I do not know this. I do not have the material so that would be determined by the machine shop. Does it matter a huge amount to know the start size from the beginning?

Zac

Okay this is going to be crude but I hope it shows all of the correct dimensions for you. If you need something else just ask. Now that I have been thinking about this more I think I want the main flange thickness to be 3/4" for added strength, and then the block-off plate/outlet raised section is an additional 1/2". I don't know if we should start off with a 1.25" thick block or go thicker and then machine down to the proper thickness? The starting block would be 12" x 16" to keep things simple.

All sharp corners on the flange plate should receive a 1/32" radius to avoid injury!

Originally Posted by TLSheff

Not to thread jack or anything but why go through all of this?

You could do a cheap custom turbo build for less headache and make more power, or LS1 swap and make 300+ hp/tq base.

You can do what you want, just seems like a lot of extra work and time verses the easier options to me.

The extra work doesn't bother me and the costs are going to be less than an LSX swap if I keep bargain hunting. So far it is just...
$150 for the Gen V M90
est $175 for the output flange
est $300 for the rest of the piping
$375 for water:air intercooler
$300 injectors
$700 Megasquirt ECU
$400 headers and exhaust
So around $2400 for this idea. There is no way I can see an LSX swap coming in for under that amount. Everything is just way too expensive when going that route unless you buy subpar parts.

As for turbo I know I could end up with MONSTER hp but I want instant torque instead. The supercharger is much easier to control boost pressure unlike a turbo with chance of boost spike. I was going to go Holset turbo mode, but changed it up for M90 power

Zac

Top question mark is 3/4"
Bottom question mark is 9/16?

That radius is 1/2" even though the stub is only 7/8" wide. The center of the 1/2" radius is based off of the point where the curve meets the 3/4" (top question mark) endpoint.

I hope that clears that up for you.
Zac