<VV> Pinging turbo

[Michael Kovacs]

You did not mention where the timing was set. I know several people who have a problem with the Pet II, with pinging. I have them in 3 cars and no problem including a mod (heads) 140 with 9.25 CR that runs happily at 12 degrees on 87 octane. Youmight try an experiment and put the old points in and recreate the parameters.
 
MIKE KOVACS 



----- Original Message ----
From: Dave Thompson <dave.thompson at verizon.net>
To: virtualvairs at corvair.org
Sent: Monday, April 7, 2008 9:32:31 PM
Subject: <VV> Pinging turbo

Hi Guys,



Well, I just passed 500 miles on my new engine and after changing the oil &
filter, I started to get a little more aggressive in my driving. When
getting onto the freeway, I GENTLY ran it up to 3500 to 4000 RPM. As soon as
the boost gauge hit zero and above the engine started to ping. I immediately
let off the peddle. I tried several more times and always got pinging above
zero. I'm running 91 octane from a busy gas station so I know the fuel is
fresh. I have never gotten any pinging below zero boost. In my water-cooed
days, pinging was caused by poor timing (in most cases).



In my research I have learned that the turbo distributor has a pressure
retard. I looked up the part number and that's what I have, not vacuum
advance. The hose to the intake is new and tight (should there be clamps on
the hose?). I have the Pertronix Ignighter II and a new 0.6 ohm Flamethrower
II coil (no resister per instructions), new cap, rotor, plugs and wires.
Before the rebuild I could hardly get 3000 RPM so I have nothing to compare
it to.



With this info, I have a few questions:



Am I right about the timing being the culprit? If not, what else should I
check?



What is an easy way to test the pressure advance without purchasing
expensive tools? I don't want to purchase a new one only to find that the
one I have works.



Could I be having other distributor problems?



I had one guy say that turbos shouldn't use the Pertronix electronic
ignition. I should only use points. What are your opinions?



My buddy asked if the sound is not pinging but is the turbo spooling up. It
is a rhythmic or ticking sound. (I thought turbos had a whine)



Any input on this will be greatly appreciated.



Thanks,



Dave Thompson

63 convertible Spyder (clone with a 64 drive train)

Westminster, Ca





_______________________________________________
This message was sent by the VirtualVairs mailing list, all copyrights are the property
of the writer, please attribute properly. For help, mailto:vv-help at corvair.org
This list sponsored by the Corvair Society of America, http://www.corvair.org/
Post messages to: VirtualVairs at corvair.org
Change your options: http://www.vv.corvair.org/mailman/options/virtualvairs 
_______________________________________________