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Re: Turbo Issues - Brainstorms Appreciated.
Posted by: joelsplace ()
Date: September 07, 2018 10:51AM

Good things to check but neither would cause his symptoms.

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Re: Turbo Issues - Brainstorms Appreciated.
Posted by: 66vairman ()
Date: September 07, 2018 10:54AM

If I recall correctly -- The 1962 turbo Spyder did not use a fuel return line. The local club was working on one with a rebuilt engine and carburetor. We could not get it to run properly.

Per Steve Goodman's suggestion we install the Holley fuel pressure regulator set to 2.5PSI (seal level) and the car ran great after that.

Yes you should use a return line, but with a functioning fuel pressure regulator it is not critical.

NOW -- keep in mind the turbo carburetor was revised often and you find mis-matched parts in them.

Back to basics --- check engine compression, fuel pressure, timing (still not sure what ignition your using), and if all are good I'd send the carburetor to Steve Goodman (Rear Engine Specialists) to sort out.

Why do have a distributor vacumm advance on a turbo engine? Stock was a pressure retard, although some modify system with electronics to control timing. Best of both worlds, advance timing under light load, retard timing under boost.

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Re: Turbo Issues - Brainstorms Appreciated.
Posted by: playerpage ()
Date: September 07, 2018 11:16AM

I was incorrectly referring to the retard as a vac.

On that note, I just got it back with the new retard and Alternator attached. Also tuned up. Seems to be running great--but of course, TBD.

See you in El Segundo!

Eric C. Player
Porterville, CA
- National Member, CORSA
- Member: Central Coast CORSA
- Former Member: Vintage CORSA Orange County & South Coast CORSA Los Angeles California Chapters. Member, ISA (Int. Screenwriter's Assn.), SAG Eligible, and Producer's Guild Aspirant


* Then: 1966 Corsa 180 Turbo, Red/1965 Monza 110 Purple/
1967 Monza 140 Red/1966 500 110 Black/1965 Monza 110 Yellow
* Now: 1966 Corsa 180 Turbo Project. Blue, Blue/Beige interior.



"Chevrolet's Corvair was a maverick machine, a rear-engined renegade born out of spite and genius." -- Sports Car Graphic, August 1969

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Re: Turbo Issues - Brainstorms Appreciated.
Posted by: joelsplace ()
Date: September 07, 2018 11:22AM

The early '63 didn't have the return either.
A common mood is to add a combo vacuum advance/pressure retard. I have one on my '64 that works well so far.

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Re: Turbo Issues - Brainstorms Appreciated.
Posted by: jjohnsonjo ()
Date: September 07, 2018 12:20PM

GM added them for a reason, they didn't do anything $$$ they thought could be done without. Also, that was with 60s gas, had far lower boiling point than todays blend. The current stuff is less buoyant and evaporates faster.

J.O.

65 Corsa Turbo Vert
79 Honda XL 500S
69 Honda CL 160 D
2010 BMW F 650 GS
2003 Bounder 36D
2013 KIA Optima SX turbo-AKA ZIPPY (wife,s car)
69 Newport Holiday Sailboat
Baja 150 dune buggy cart
Coleman HS 500 UTV
2016 KIA Sorento SXL Turbo

Bethlehem,Pa

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Re: Turbo Issues - Brainstorms Appreciated.
Posted by: swingboyla ()
Date: September 10, 2018 04:34PM

I went through a lot of misery with regard to fuel pressure and fuel flow rate on my 1965 Turbo Corsa. YH flooding and also fuel starvation. I swapped out like 5 new mechanical fuel pump replacements and put in the Holly pressure regulator and a fuel pressure gage. The replacement fuel pumps were all over the place as far as psi -- same brand. I measured 5-9, 11, as high as 14 psi on one. All the same part # and manufacturer. I cut and cut and cut the spring on one until I had it destroyed -- it never worked to bring the psi down enough. The Holly pressure regulator worked and helped -- but only marginally. The big problem is that when I had the pressure dialed down enough to prevent the over pressure problem it would not get enough flow at freeway speeds and starve. I could never get it to work satisfactorily.

The ultimate root cause was that the PO had tried to solve a fuel leak problem at the fuel return line by removing the rubber fuel line that with a rubber "T" goes into the filler tube and then just capped off the steel return line down below the tank where it runs along the cross frame. So even though I had a correct turbo fuel filter with the pressure relief return, it was never relieving any pressure. We installed a 2.5-4 psi \ 30 GPH self regulated electric pump and fixed the fuel return line and got rid of the Holly pressure regulator and never had another problem with the YH and fuel flooding or starvation. Other aspects of the YH were another matter and I ultimately replaced the YH with another carb. I used the Clark's fuel pump pass-through adaptor on the mechanical pump (push rod and guts removed) to keep the original fuel lines.

No amount of fussing with an inline pressure regulator and replacement mechanical pumps locally available worked -- just a waste of my time and money. I do not know if Clark's and other suppliers version of the mechanical pump is more reliably in keeping with the Corvair specs -- nothing I bought was even close.

Paul
Los Angeles CA

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Re: Turbo Issues - Brainstorms Appreciated.
Posted by: jastranc ()
Date: September 10, 2018 06:04PM

Here is what I run on 69 Monza / Corsa 180HP turbo.My 69 has factory return fuel line so I run return hose from factory turbo fuel filter to that return line.I only run A True AirTex electric fuel pump and no other.I use a Real Dale Engineering pressure retard / advance on my distributor that has points.Advance is set about 20 degrees advance with line plugged to set then reinstall line.My carb is stock YH with stock jet and rod.It works no ping on 91-93 premium unleaded.

Jim Stranc

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Re: Turbo Issues - Brainstorms Appreciated.
Posted by: jjohnsonjo ()
Date: September 10, 2018 07:01PM

jastranc Wrote:
-------------------------------------------------------
> Here is what I run on 69 Monza / Corsa 180HP
> turbo.My 69 has factory return fuel line so I run
> return hose from factory turbo fuel filter to that
> return line.I only run A True AirTex electric fuel
> pump and no other.I use a Real Dale Engineering
> pressure retard / advance on my distributor that
> has points.Advance is set about 20 degrees advance
> with line plugged to set then reinstall line.My
> carb is stock YH with stock jet and rod.It works
> no ping on 91-93 premium unleaded.
>
> Jim Stranc


Yep that works for me as well, almost exactly , I do have the Holly low pressure reg as well. Don't really need it with the Airtex. I haver NEVER had a fuel flow issue with the Holley. It can flow way more than a YH needs, as in big 4bbl. I have had the flow issues wit the regs with the dial on the top. Maybe there are fake Holley regs as well.

J.O.

65 Corsa Turbo Vert
79 Honda XL 500S
69 Honda CL 160 D
2010 BMW F 650 GS
2003 Bounder 36D
2013 KIA Optima SX turbo-AKA ZIPPY (wife,s car)
69 Newport Holiday Sailboat
Baja 150 dune buggy cart
Coleman HS 500 UTV
2016 KIA Sorento SXL Turbo

Bethlehem,Pa

Image and video hosting by TinyPic

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Re: Turbo Issues - Brainstorms Appreciated.
Posted by: playerpage ()
Date: September 11, 2018 02:50PM

Nice setup.

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