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My Corvair Porsche 914 Project
Posted by: DaveO90s4 ()
Date: September 22, 2017 03:02AM

Hi all,

I can now see the light at the end of the tunnel on my Corvair powered Porsche 914 project. I've not posted much about this for fear of embarrassing myself if it all comes to nothing.

Suffice to say, the reverse rotation engine mates to 914 gearbox via the Kennedy adapter perfectly, I've had a new truss made that attaches across the firewall and to the chassis behind the 914 jack points and a new cradle that attaches to the front (from my perspective, not yours!!) of the engine. These mate via rubber engine mounts.

I've had the engine plus gearbox in and out numerable times getting things just 'so', such as the remote mounted oil filter (short hoses, no nasty bends, within the fan belt so won't inhibit belt changes), getting the remote filter located so as not to foul the 914 shift rod in any gear, etc etc etc.

All fits beautifully - as if it were made for this application (even some of the OEM 914 tinware fits - including tin : block bolt hole locations). But I'll need to make my own tinware to prevent re re re re re circulation of hot air from beneath the engine to the fan. That will be one of the last things I tackle.

I'm now turning my mind to the exhaust system. Clearly with my engine the 'wrong' way around (mid engine, gearbox behind engine) a standard Corvair exhaust system is not going to work. I'll need to design it myself and have it fabricated.

My current uninformed thoughts are three 1.5 inch pipes per side, each pipe running rearward almost parallel to a 3 into one connector. Size of connector??. Then a right angle bend for RH exhaust to connect with a skinny east -west mounted muffle to exit on LH side and vice versa for LH exhaust, collector, east - west Muffler to exit on RH side.

Does this sound sensible? Do I need to have a connector pipe to join LH and RH together? Does 1.5 pipe ex each exhaust sound sensible (that is what I have already in each head with a flange, so easiest to stay with that if possible).

Other relevant things? Has an Otto 30 (or maybe 20) cam, a pair of triple Zenith 40 TIN carbs, and I'm hoping to not constrict whatever power the old donk may be able to produce.

I look forward to hearing what you folk think I should include in the design of this one-off exhaust system.

Yes - I know I need to post photos. I will. Busy, busy busy drinking smiley

With thanks in advance
Dave O
Australia



Edited 1 time(s). Last edit at 09/22/2017 04:23PM by MattNall.

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Re: My Corvair Porche 914 Project
Posted by: DaveO90s4 ()
Date: September 22, 2017 03:03AM

Jeez, you'd think I could spell Porsche properly!!

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Re: My Corvair Porche 914 Project
Posted by: kenzen ()
Date: September 22, 2017 03:12AM

Pictures...smiling bouncing smiley

kenzen
66 Monza Coupe 110/PG
Bel Air, MD

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Re: My Corvair Porche 914 Project
Posted by: DaveO90s4 ()
Date: September 22, 2017 03:38AM

Yes. Pictures. I have 'em. I promise to post em...

I'll have to do it when I'm at work, and not so busy!! spinning smiley sticking its tongue out

Exhaust advice??

Dave

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Re: My Corvair Porche 914 Project
Posted by: JimBrandberg ()
Date: September 22, 2017 03:55AM

I think 1.5" primary tubes are okay.
I would go into a collector and secondary tube after 36". 2.25 or 2.5 is good.
A balance tube between the two secondaries would be a good thing.
My opinion and someone might differ. I am not in the bigger is better camp.
Jim Brandberg
Isanti, MN
CorvairRepair.com

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Re: My Corvair Porche 914 Project
Posted by: DaveO90s4 ()
Date: September 22, 2017 04:03AM

OK. Photos to follow.

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Re: My Corvair Porche 914 Project
Posted by: DaveO90s4 ()
Date: September 22, 2017 04:04AM

Wooden mock up of chassis engine mount (upside down - don't know why)

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Re: My Corvair Porche 914 Project
Posted by: DaveO90s4 ()
Date: September 22, 2017 04:08AM

Various photos of engine in. The single blue bar beneath the engine is just for ease of ins and outs - won't be there once finally installed

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Re: My Corvair Porche 914 Project
Posted by: DaveO90s4 ()
Date: September 22, 2017 04:10AM

More

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Re: My Corvair Porche 914 Project
Posted by: DaveO90s4 ()
Date: September 22, 2017 04:12AM

More. One may not be Corvair related.

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Re: My Corvair Porche 914 Project
Posted by: DaveO90s4 ()
Date: September 22, 2017 04:14AM

And more. One with the new OEM 12 plate cooler from Al Lane (thanks Al).

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Re: My Corvair Porche 914 Project
Posted by: DaveO90s4 ()
Date: September 22, 2017 04:20AM

And three more.

Why does it put the photos sideways. Oh well. you'll all get the idea I'm sure.

More than happy to provide any specific photos if required.

I reckon 140HP in a car that weighs just on 1 tonne should be fun - about the same power to weight ratio as my 84 3.2L Carrera I reckon.

Many of the Porsche guys reckon this is sacrilege - I don't care about that. And I have made absolutely zero body or other changes and the original engine could be put back in within less than 1/2 a days work.

Exhaust advice???????

Dave

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Re: My Corvair Porche 914 Project
Posted by: MattNall ()
Date: September 22, 2017 07:59AM

Good progress!

Pics from Phone are often rotated..who knows!

As far as exhaust....A few member who have had these will chime in I'm sure..





MODERATOR
Sea Mountain, between Charleston Harbor and Coos Bay! SW Oregon Coast
Click HERE for My Website...Click HERE for My TechPages!
..............................110-PG.................................................Webered-Turbo

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Re: My Corvair Porche 914 Project
Posted by: Mel ()
Date: September 22, 2017 08:48AM

Yikeseye popping smiley that's a ton of work , keep it up smiling smiley

Orangeville, Ontario. CANADA

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Re: My Corvair Porche 914 Project
Posted by: moomba32 ()
Date: September 22, 2017 08:51AM

Is there a way you can swap stock exhaust logs to the other side so the outlet now points towards the rear of your car? Another idea is to use the stock logs in stock position and turn the exhaust pipes to cross the engine before turning to the rear to exit the car.

Don Marlowe
66 Monza 2Dr 140/pg
64 Spyder convertible now, 110/pg
Eutawville SC

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Re: My Corvair Porche 914 Project
Posted by: American Mel ()
Date: September 22, 2017 10:28AM

moomba32 Wrote:
-------------------------------------------------------
> Is there a way you can swap stock exhaust logs to
> the other side so the outlet now points towards
> the rear of your car? Another idea is to use the
> stock logs in stock position and turn the exhaust
> pipes to cross the engine before turning to the
> rear to exit the car.


He has slant tubes installed. Does not use "logs" anymore.

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Re: My Corvair Porche 914 Project
Posted by: ROD ()
Date: September 22, 2017 11:24AM

My 914 has found a new home but here are some pictures of the headers I put together. I had angled exhaust ports and ran it open headers.

Rod Tetrault
El Cajon , CA
65 Corsa Yenko Clone / 65 Corsa EO Creampuff Vert
66 Corsa "JIMISH" Mid engine Turbo LS1 currently 2nd fastest Corvair in the USA
Class 5 Corvair powered Baja
61 Vintage Rampy
Corvair powered Buggy x 3
Enough hidden parts to build a space ship

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Re: My Corvair Porche 914 Project
Posted by: JimBrandberg ()
Date: September 22, 2017 11:24AM

Where did you get the slant tubes? I haven't seen any that swoop out to the side like that.
Jim Brandberg
Isanti, MN
CorvairRepair.com

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Re: My Corvair Porche 914 Project
Posted by: ROD ()
Date: September 22, 2017 11:25AM

2

Rod Tetrault
El Cajon , CA
65 Corsa Yenko Clone / 65 Corsa EO Creampuff Vert
66 Corsa "JIMISH" Mid engine Turbo LS1 currently 2nd fastest Corvair in the USA
Class 5 Corvair powered Baja
61 Vintage Rampy
Corvair powered Buggy x 3
Enough hidden parts to build a space ship

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Re: My Corvair Porche 914 Project
Posted by: ROD ()
Date: September 22, 2017 11:27AM

3

Rod Tetrault
El Cajon , CA
65 Corsa Yenko Clone / 65 Corsa EO Creampuff Vert
66 Corsa "JIMISH" Mid engine Turbo LS1 currently 2nd fastest Corvair in the USA
Class 5 Corvair powered Baja
61 Vintage Rampy
Corvair powered Buggy x 3
Enough hidden parts to build a space ship

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