cast your own EA81 inlet manifold ?
- steptoe
- Master Member
- Posts: 11582
- Joined: Thu Oct 06, 2005 10:00 am
- Location: 14 miles outside Gotham City
cast your own EA81 inlet manifold ?
What is wrong with all the genius with the Subaru world with not having come up with casting our own aluminium alloy inlet manifold ?
Its been done before in race circles
Cannot be that difficult surely ?? Gotta be more rudimentary than carbon fibre, 3D printing and stuff
Arn't the insides made hollow by making sandy clay shapes set up within another sandy clay mould and just pour in your molten alloy, let it set cold, machine up necessary mating ends.Drill and tap holes for booster and other vac connections and temp switches ...
Surely peoples would pay what ? $200 or more for a custom made run of manifolds to take a weber carb without adaptors, two webers if you feel the need.
Start saving beer cans boys !!
autospeed has a three part story ...must have been done here
http://www.matildafoundry.com.au/
Part 1 of the story http://www.autospeed.com/cms/article.html?&A=112614
Part 2 http://www.autospeed.com/cms/article.html?&A=112615
part 3 http://www.autospeed.com.au/cms/article.html?&A=112616
Its been done before in race circles
Cannot be that difficult surely ?? Gotta be more rudimentary than carbon fibre, 3D printing and stuff
Arn't the insides made hollow by making sandy clay shapes set up within another sandy clay mould and just pour in your molten alloy, let it set cold, machine up necessary mating ends.Drill and tap holes for booster and other vac connections and temp switches ...
Surely peoples would pay what ? $200 or more for a custom made run of manifolds to take a weber carb without adaptors, two webers if you feel the need.
Start saving beer cans boys !!
autospeed has a three part story ...must have been done here
http://www.matildafoundry.com.au/
Part 1 of the story http://www.autospeed.com/cms/article.html?&A=112614
Part 2 http://www.autospeed.com/cms/article.html?&A=112615
part 3 http://www.autospeed.com.au/cms/article.html?&A=112616
- Willy Fisterbottom
- Junior Member
- Posts: 330
- Joined: Wed Feb 26, 2014 9:37 am
- Location: NSW
Wow that was a good read. Wouldnt hurt to give Matilda a call to see how much it would cost? The hardest part would be getting the part seems to be getting a good pattern box made.
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http://www.willyweather.com.au
http://www.willyweather.com.au
- steptoe
- Master Member
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- Joined: Thu Oct 06, 2005 10:00 am
- Location: 14 miles outside Gotham City
Enquiry would sound best coming from an engineering related business than just a forum member. A few options come to mind for manifolds and that would be create one half that doubles as both left and right with air and water transfer outlets - similar to the cylinder heads being ambidextrous for twins .And a weber receptive would sell better, in a package deal with the 'Bottom unequal length Y pipe ?
- Silverbullet
- Senior Member
- Posts: 2878
- Joined: Mon Aug 23, 2010 6:20 pm
- Location: Adelaide
The hard and skilled part is making a pattern to begin with. Whatever part you want you need to make a perfect replica in wood first, to press the casting sand around which makes the mold. Then for the internal cavities like you said Jonno you need to make a plug in the shape you want the internals to be, made out of a different sand and placed neatly inside the mold.
For the EA81 manifolds you would need 2 internal plugs since you need a coolant passage separate from the air passage. That Matilda foundry looks promising for a possible place to make them since they say they can do one off's.
Would probably cost alot more than $200 per manifold though...well depending on how many you make in a run.
For the EA81 manifolds you would need 2 internal plugs since you need a coolant passage separate from the air passage. That Matilda foundry looks promising for a possible place to make them since they say they can do one off's.
Would probably cost alot more than $200 per manifold though...well depending on how many you make in a run.
Will it ever end!?
-EA81 TWIN CARB!!!!
-L series 5 speed
-Custom paint job
-2" lift
-Full custom re-wire
-L series front end
-EA81 TWIN CARB!!!!
-L series 5 speed
-Custom paint job
-2" lift
-Full custom re-wire
-L series front end
When I was a kid, my dad built a small forge out of a gas bottle and a manky old vacuum cleaner, and we used it to meld down beer cans. About 50 or 60 cans was enough to cast a cylinder of aluminium about 80x80cm. We then machined it to what we needed.
Made things like this,
Making things like carby adaptors would be easy, but something like the ea81 manifold? For low volume you probably better off fabbing it out of tube and plate steel.
Regards
Doug
Made things like this,
Making things like carby adaptors would be easy, but something like the ea81 manifold? For low volume you probably better off fabbing it out of tube and plate steel.
Regards
Doug
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- Silverbullet
- Senior Member
- Posts: 2878
- Joined: Mon Aug 23, 2010 6:20 pm
- Location: Adelaide
- Silverbullet
- Senior Member
- Posts: 2878
- Joined: Mon Aug 23, 2010 6:20 pm
- Location: Adelaide
So you must have had the indexing head geared to the feed handle at the other end? To get the helix?Subydoug wrote:All manual with a index wheel. Only got into cnc these last few years.
Doug
Sorry if I'm hi-jacking here, I just love seeing this kind of stuff
Will it ever end!?
-EA81 TWIN CARB!!!!
-L series 5 speed
-Custom paint job
-2" lift
-Full custom re-wire
-L series front end
-EA81 TWIN CARB!!!!
-L series 5 speed
-Custom paint job
-2" lift
-Full custom re-wire
-L series front end
Very observant of you Jonno, yes the fins are thinner at the bottom. Ideally a V shaped cutter would be the way to go. Me and my dad were trying to build a small axial turbine. The ali shroud was also beer cans melted down.
SilverBullet, picture tell a thousand words?
I cant find my favorite thing we built out of beer cans. It was a valve head for a pulse jet. Looked a lot like a reed valve for a 2 stroke. lots of math .
Regards
Doug
SilverBullet, picture tell a thousand words?
I cant find my favorite thing we built out of beer cans. It was a valve head for a pulse jet. Looked a lot like a reed valve for a 2 stroke. lots of math .
Regards
Doug
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- Silverbullet
- Senior Member
- Posts: 2878
- Joined: Mon Aug 23, 2010 6:20 pm
- Location: Adelaide
- El_Freddo
- Master Member
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- Joined: Tue Oct 04, 2005 10:00 am
- Location: Bridgewater Vic
- Contact:
Hey, hey, steady on with that term! If you're going to use it in this context "respectful" should be used.steptoe wrote:hi-jack away - ladder climber
Ladder climber out my way isn't a good thing...
I too am happy for silverbullet Sam to hijack away - it's all interesting and I love seeing what others can do. The use of a lathe fascinates me!
Cheers
Bennie
- Dean.nabbe
- Junior Member
- Posts: 94
- Joined: Sun Feb 24, 2013 9:55 pm
- Location: Benalla, Victoria
i have to say, i'm impressed.. i wish i could do half the stuff you guys talk about...
the Brumby upgrade is my first ever semi complicated DIY task... building the hardtop tonneau is my first ever go at design and build of anything..
the Brumby upgrade is my first ever semi complicated DIY task... building the hardtop tonneau is my first ever go at design and build of anything..
[SIGPIC][/SIGPIC]
1987 Brumby.
still to come:
2"exhaust
winch bar
1987 Brumby.
still to come:
2"exhaust
winch bar