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> Rotary 914!, 200whp ; Prepping for Okteenerfest
gabeurgelles
post Aug 30 2016, 08:38 AM
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So it was time to build an intake manifold. I started by finding some 180 degree bends with the correct radius. After a lot of looking I found what I was looking for and ended up paying around $90 for 5 bends. Since I don't have access to a machine shop, all the fabrication had to take place in my garage with everyday tools. I was able to shape the pipes by hand with a hammer and a jigsaw. I made a template/jig for the manifold of a piece of wood and shaped everything to fit that.

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gabeurgelles
post Aug 30 2016, 08:39 AM
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gabeurgelles
post Aug 30 2016, 08:40 AM
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Rotary'14
post Aug 30 2016, 08:55 AM
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QUOTE(gabeurgelles @ Aug 30 2016, 07:21 AM) *

So engine was rebuilt, everything was replaced and new carb installed. The only issue now was that on an rx7 the engine and transmission assembly sits at a 5 degree angle but on the 914 it sits dead level. So not the weber was sitting 5 degrees tilted forward which did not allow for correct tuning. If the fuel level was set correctly for one barrel, the other would either be flooding over or starving for gas. So I had two options, either tilt the engine and transmission on the 914 or make a custom manifold that would provide better flow and perfect placement for the carb.



Building a manifold can be difficult in your garage without all the cool tools. (but I encourage you to expand your skills!) I bet you can get the 5 degrees you want by shimming the engine mount or the trans mount to get the tilt you want for your carb,,, or just slap on a weber throttle body onto your car the way it sits now? I love your project.
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gabeurgelles
post Aug 30 2016, 01:25 PM
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Well, I was able to pull it off with what I had and here is the final product. Still needs to be cleaned up and made to look pretty but that us all in preparation for the drive up to Okteenerfest.

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gabeurgelles
post Aug 30 2016, 01:26 PM
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And here it is with the carb mounted...

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gabeurgelles
post Aug 30 2016, 01:27 PM
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and on the car... some stuff has changed since this picture was taken so I'll try to update that as soon as I can.

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matthepcat
post Aug 30 2016, 01:48 PM
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Interesting set-up. Looks cool.

I have a heavily ported Nikki carb on mine. I have never experienced mid-corner fuel starvation, but I suppose I have not run a track day yet ( just aggressive mountain roads).

These little rotaries are so fun. Like a sport bike engine.
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Rotary'14
post Aug 30 2016, 02:00 PM
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Well your manifold is done,,, Your aluminum welding skills coming along nicely there. (IMG:style_emoticons/default/aktion035.gif) (IMG:style_emoticons/default/aktion035.gif)
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Andyrew
post Aug 30 2016, 02:57 PM
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Great looking intake!!
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mbseto
post Aug 31 2016, 12:35 PM
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Awesome! Love seeing fabbed headers and manis, not sure why.
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Mueller
post Aug 31 2016, 01:55 PM
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QUOTE(matthepcat @ Aug 30 2016, 12:48 PM) *

Interesting set-up. Looks cool.

I have a heavily ported Nikki carb on mine. I have never experienced mid-corner fuel starvation, but I suppose I have not run a track day yet ( just aggressive mountain roads).

These little rotaries are so fun. Like a sport bike engine.



I've never driven a rotary motor, are they pricey to rebuild?
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matthepcat
post Aug 31 2016, 03:37 PM
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Next time I see you at an event you can drive mine.

Master rebuild kits are about $1,000 in parts. If no machining is required, its not too bad.

QUOTE(Mueller @ Aug 31 2016, 12:55 PM) *

QUOTE(matthepcat @ Aug 30 2016, 12:48 PM) *

Interesting set-up. Looks cool.

I have a heavily ported Nikki carb on mine. I have never experienced mid-corner fuel starvation, but I suppose I have not run a track day yet ( just aggressive mountain roads).

These little rotaries are so fun. Like a sport bike engine.



I've never driven a rotary motor, are they pricey to rebuild?
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Mike Bellis
post Aug 31 2016, 06:40 PM
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Looks great! Only one suggestion... Add a phenolic spacer between the carb and manifold to reduce heat soak in the carb. You don't need your fuel boiling off.
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gabeurgelles
post Sep 1 2016, 08:09 AM
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QUOTE(Mike Bellis @ Aug 31 2016, 08:40 PM) *

Looks great! Only one suggestion... Add a phenolic spacer between the carb and manifold to reduce heat soak in the carb. You don't need your fuel boiling off.



yeah I'll definitely be looking into those spacers!
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porschetub
post Sep 2 2016, 03:16 AM
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QUOTE(Mike Bellis @ Jun 12 2015, 02:36 PM) *

QUOTE(Mueller @ Jun 11 2015, 06:47 PM) *

INB4 Mike Bellis (IMG:style_emoticons/default/smile.gif)

(IMG:style_emoticons/default/unsure.gif)


I've blown up enough rotaries. I'm sticking with the Audi... (IMG:style_emoticons/default/shades.gif)

Post some more pics of the radiator setup. Rotaries run hot when flogged.



Why do they blow up so much Mike ....never had a thing to do with them but have heard the noise a (IMG:style_emoticons/default/barf.gif) and heard they drink fuel like a elephant drinks water (IMG:style_emoticons/default/laugh.gif) .
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Mike Bellis
post Sep 2 2016, 02:18 PM
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QUOTE(porschetub @ Sep 2 2016, 02:16 AM) *

QUOTE(Mike Bellis @ Jun 12 2015, 02:36 PM) *

QUOTE(Mueller @ Jun 11 2015, 06:47 PM) *

INB4 Mike Bellis (IMG:style_emoticons/default/smile.gif)

(IMG:style_emoticons/default/unsure.gif)


I've blown up enough rotaries. I'm sticking with the Audi... (IMG:style_emoticons/default/shades.gif)

Post some more pics of the radiator setup. Rotaries run hot when flogged.



Why do they blow up so much Mike ....never had a thing to do with them but have heard the noise a (IMG:style_emoticons/default/barf.gif) and heard they drink fuel like a elephant drinks water (IMG:style_emoticons/default/laugh.gif) .

Heat and pre-ignition and the weak links on a rotary. If you can control those, they run and drive wonderfully.
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ablesnead
post Sep 2 2016, 02:33 PM
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I have driven and raced against 12 a and 13 B. Rotaries for many years....In ITS trim , 180 to 200 hp they were by a factor of 3 the most reliable engine available...I have no experience with turbomotors....if you are looking for that range of HP in a 914....they are worthy of real consideration, should
Be very 901 friendly with their torque characteristics.....
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andys
post Sep 2 2016, 02:43 PM
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QUOTE(gabeurgelles @ Aug 30 2016, 07:38 AM) *

So it was time to build an intake manifold. I started by finding some 180 degree bends with the correct radius. After a lot of looking I found what I was looking for and ended up paying around $90 for 5 bends. Since I don't have access to a machine shop, all the fabrication had to take place in my garage with everyday tools. I was able to shape the pipes by hand with a hammer and a jigsaw. I made a template/jig for the manifold of a piece of wood and shaped everything to fit that.




Where did you find the aluminum 180's? Source?

Thanks,

Andys
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gabeurgelles
post Sep 4 2016, 04:50 PM
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QUOTE(andys @ Sep 2 2016, 04:43 PM) *

QUOTE(gabeurgelles @ Aug 30 2016, 07:38 AM) *

So it was time to build an intake manifold. I started by finding some 180 degree bends with the correct radius. After a lot of looking I found what I was looking for and ended up paying around $90 for 5 bends. Since I don't have access to a machine shop, all the fabrication had to take place in my garage with everyday tools. I was able to shape the pipes by hand with a hammer and a jigsaw. I made a template/jig for the manifold of a piece of wood and shaped everything to fit that.




Where did you find the aluminum 180's? Source?

Thanks,

Andys



Sharpe Products, they supply aluminum for hand rails and they come in many different radius'. The ones I used were 1.5" OD, 4 inch radius and .125" wall thickness.
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