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100# springs wanted
Posted by: Max Roeder ()
Date: April 20, 2017 03:00AM

Looking for a set of dual springs with corvair install height right at 100#'s. I'm going to move away from the 115# Isky for reasons you see in the attached pic. If you know the source for a set please let me know where I can find them.

needpart



Edited 1 time(s). Last edit at 04/20/2017 08:17AM by MattNall.

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Re: 100# springs wanted
Posted by: Max Roeder ()
Date: April 20, 2017 03:27AM

Max Roeder Wrote:
-------------------------------------------------------
> Looking for a set of dual springs with corvair
> install height right at 100#'s. I'm going to move
> away from the 115# Isky for reasons you see in the
> attached pic. If you know the source for a set
> please let me know where I can find them.

Forgot to tell you the pics are of cam face, not sure why this failure has occured but it looks like surface contact fatigue. Problem is the first pic shows an area of the exhaust cam lobe for #5 in the center of the lobe where nothing rides?

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Re: 100# springs wanted
Posted by: dryenko ()
Date: April 20, 2017 04:37AM

Looks like compression fatigue to me.
What cam were you running.
A Schneider grind or regrind perhaps??
There are several single spring kits available on Amazon that might work for you:
[www.amazon.com]

You might have to get some +.050" keepers and +.050 or +.0100" retainers to set the pressures where you want them to be.

Also, see your PM ...

Bob C aka Dryenko
Dobson, NC 27017

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Re: 100# springs wanted
Posted by: BobV66Vair ()
Date: April 20, 2017 09:40AM

Maybe an insulting question, not meant to be, but what oil are you running? I assume you have read the long but informative treatise on oil viscosity and zinc? This is the exact wear the writer addresses. Might be worth a read to save another failure.

Oil Testing

Bob Vinnacombe
Sandy, Oregon
1965 Corsa 140 stock
1966 Monza Soon to be race car
1968 Monza Parts for now

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Re: 100# springs wanted
Posted by: davemotohead ()
Date: April 20, 2017 10:26AM

Max, you might inspect and Re-Check your oiling system, this is the 3rd failure you have reported that IMO is oil related, Just a observation.





Email me at: Dave Motohead

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Re: 100# springs wanted
Posted by: Max Roeder ()
Date: April 20, 2017 11:22AM

Shella Rotella T, 10W-30. No heat, no pressure problems, double filtered, not sure what is going on. The spalling is in an area the lifter doesn't touch but I see similar, what looks like compressive fatigue failures in other areas. cam not out yet but will do further diagnosis on it then. One of my customers is Contour Hardening Inc. and their metallurgist may be able to pinpoint the issue. Snowball takes another one on the chin!

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Re: 100# springs wanted
Posted by: 66vairman ()
Date: April 20, 2017 01:15PM

What version and viscosity of Rotella T are you using? Unlike the old days, only one version is approved for gasoline engines now.

What cam was in the engine?

On both my engines I run a mild Isky 260 cam, standard valve springs, off the shelf low ZDDP 10W30 motor oil - and all is fine.

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Re: 100# springs wanted
Posted by: Max Roeder ()
Date: April 20, 2017 03:49PM

66vairman Wrote:
-------------------------------------------------------
> What version and viscosity of Rotella T are you
> using? Unlike the old days, only one version is
> approved for gasoline engines now.
>
> What cam was in the engine?
>
> On both my engines I run a mild Isky 260 cam,
> standard valve springs, off the shelf low ZDDP
> 10W30 motor oil - and all is fine.

Rotella T is now Rotella T4, I called them and the ZDDP is in the oil (they say) and claim better protection than the original T.

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Re: 100# springs wanted
Posted by: 66vairman ()
Date: April 20, 2017 05:28PM

Years ago (the last time I could find a spec. sheet) Rottella was revised to reduce ZDDP because of the clean diesel requirements. At that time Shell said they had changed the additive package for improved wear protection in spite of the reduced ZDDP. Also at that time the reference "Diesel and gasoline engines" was changed to "Diesel engines" - not sure why.

Now only the Rottella T6 labels says ""Diesel and gasoline engines" and the only viscosity I could find was 5W40 for modern gasoline engines. I'm not sure I'd want to use it in a Corvair engine.

Maybe Richard can comment.

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Re: 100# springs wanted
Posted by: davemotohead ()
Date: April 20, 2017 05:54PM

Max, Use the Brad Penn break in oil, it has the right stuff.





Email me at: Dave Motohead

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[motoheadmall.com]
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