I have been thinking about this for some time.

 

How hard can it really be :laff:

 

Serisouly?

 

Aluminum tube stock

Brass cut butterflyes

Steel square linkage

Bit of welding here and there

 

Opinions?

Hmm I have thought about this myself actually.

 

But then I decided I could spend the time it would take to fab some up at work earning money, and then just buy some! Easier and less troublesome

 

OR depending on your aplication you could possibly use dead sidedrafts? And mod these to suit. Plenty of manifolds out there for webers/dellortos

 

Its kinda like the times where I think, yeah, I could give twin cam head casting a go! But why reinvent the wheel?

OR depending on your aplication you could possibly use dead sidedrafts? And mod these to suit. Plenty of manifolds out there for webers/dellortos

Its what i've been thinking of myself instead of trying to fab something up, lot easier maybe not as pretty but it'd be a lot easier

Yes I have thought of the dead webber idear, but it dosnt float my boat, I couldnt stand having all that extra casting there... OCD

 

Nothing like learning a new skill :laff:

 

Going to slowly work through this, cad models first.

 

Now where is my big book of bearings?

Edited April 22, 201016 yr by Jason

A mate of mine just got his datsun 1000 running with an a14 engine

and he used thottle bodies of a 900cc(i think) motorbike.

he used the injectors and fuel rail complete and bought one of those

megasquirt computers u put together yourself VERY COOL.

It also uses a plastic type trumpet aswell

Worth a look maybe!

Anyway good luck with it

Cheers Justin

I wouldn't bother making a throttle body from scratch given how many there are out there for a range of applications, it would be easier to modify/adapt an OEM to suit

 

But it would be cool.

 

I got bored. Enjoy! Any criticsm welcome

Edited April 23, 201016 yr by KENut

Problem with that, are you going to get some aluminum custom extruded? or cast?

 

Loading CAD at the moment.

 

I'm going to be working on something that requires minumum of profesional maching work, with maximum work being diy

Edited April 23, 201016 yr by Jason

...

Edited October 16, 201016 yr by wde_bdy

Yeah 20V quads can be had for about that over here too.

 

Jason: I just did it like that because I could. Can do whatever shape is easiest. That took like 20 mins tops

What program are you using?

Looks good! The biggest drama is getting the tolerances right. The thermal expansion is different with metals. You need to know the approximate temperature the intake will get to, and make sure that when the metal expands that the tolerances don't make the throttle shaft or butterfly bind.

Heres what I'm thinking

 

Extuded aluminum housing (in cad pics its only 5mm)

Square or circulare bearing housing, easily sanded down to match the outside and welded inplace

Bored out to fit bearing, looking for one that will also include a seal but easiler have the bearing then a seal

Then end cap to make sure they all done fall out - option, not sure if I would want to press fit in the bearing

 

So the only parts that will need to be milled will be the brass linkage bar

And laser cut butterflys

 

Thoughts?

 

Solid Edge :D

 

will be looking into expansion properties once Ive got a desing toatly finalised.

 

If I use high grade brass it should keep the butterfly under wraps, only issue will be the aluminum housing, but can always be tested in the oven :laff:

 

I just need to figure out a way to stop lateral motion hmmm

 

 

 

Also yes i COULD buy a set but wheres the fun in that? Its about braging rights!

Edited April 23, 201016 yr by Jason

Is it neccessary to have bearings? And why not use plain bearings? I think a thicker wall section would be easier to work with, and then just press fit plain bearings in. Especially if your welding it, then warpage will be a pain with thin wall. Also it'll be subject to alot of vibration, roller bearings are not always suitable as the race will become brinelled

If its bragging rights you want, and you're going fully custom anyhow, don't stuff around with a butterfly, they were used on early engines because they were scavenged from steam engines of the same era when the combustion engine were designed and were a quick solution to a variable flow valve. I really believe that the alternatives haven't been explored on a production cars, so they're all shrouded with fable and myth :laff:

 

Slide throttles FTW, where what truly means what. I've got 3 different designs of them I've thought up over the years, I'm pretty keen to see what they're capable of. All the people I've talked to who've actually run them say there's no comparison. Ivan Tighe's brother has an injected 500hp 350 chev setup on them, and he said at open throttle the way the motor performs is incredible compared to other motors with similar power but different induction.

 

Haha - sorry for the spanner in works!

perfect example how side throttle work/look like

 

http://www.e30m3project.com/e30m3performan...lides/index.htm