[DeTomaso] detonation problems

[redvobra at aol.com]

 I think you're on the money. I pulled the plugs today and the #1 plug was covered in oil. I just replaced the intake, so I must have a bad seal there. :(
 
 Time to order another set of gaskets and do it again.
 
 Thanks for the tip.
 
 -Chris
    
 -----Original Message-----
 From: wkooiman at earthlink.net
 To: detomaso at realbig.com
 Sent: Sun, 1 Oct 2006 5:51 PM
 Subject: RE: [DeTomaso] detonation problems
 
  There's a good chance you're sucking oil into one of the ports.

I once removed a bolt to attach a throttle return spring.  I didn't get the
bolt on tight enough.  It pinged some, but only when it was under load.  I
figured it was timing or bad gas.  When I later removed the intake, I could
see the trail of oil going into the port - right next to the replaced bolt.

It doesn't take much to allow oil to get sucked into a port.  It also
doesn't take much oil to cause detonation.

I'm not sure how you can resolve this without removing the intake.  If
you're good, you can probably see bits of aluminum on a plug.  I'm not that
good.  I'd think you'd have one plug that looks different from the rest, but
that's just a guess.  If it were me, I'd remove the intake and look for
trails of black going into a port.

I doubt that it's the carb.  Holley sets up their carbs a little rich to
prevent problems like this.

Will.

-----Original Message-----
From: detomaso-bounces at realbig.com
[mailto:detomaso-bounces at realbig.com]On Behalf Of redvobra at aol.com
Sent: Saturday, September 30, 2006 7:36 PM
To: jtaphorn at kingwoodcable.com; detomaso at realbig.com
Subject: Re: [DeTomaso] detonation problems


 Yeah, it's quite sluggish to get the rpm's up, even for a launch. Feels
like a really heavy flywheel or something. If I advance the timing a bit,
will it cause more detonation?

 Not sure about the total advance or the curve. Whatever is factory from the
Mallory Unilite distributor is what I have...

 Biggest change recently is that I swapped from a torker intake to a
performer intake so that I could put a stock engine cover on. Perhaps the
stock engine cover is not venting heat as well. Engine is warmer, plus it's
bringing in warmer air?

 -Chris
 -----Original Message-----
 From: jtaphorn at kingwoodcable.com
 To: redvobra at aol.com; detomaso at realbig.com
 Sent: Sat, 30 Sep 2006 3:49 PM
 Subject: Re: [DeTomaso] detonation problems

  Chris

Your initial timing is very low.  Does the car fell sluggish off throttle?

Perhaps more important than initial timing is the dimension of the curve and
total advance.

At what RPM are you getting total advance and what is it?

Also, the stock damper outer rings separate from the inner damper over time
and may shift causing the timing marks to be off.  It can be difficult to
detect this shift.  It is best to look at the status of the rubber insulator
between the two pieces.  Another approach is to find top dead center on #1
cylinder and see if the timing mark is at "0".  You need to determine if the
damper marks are accurate.

With this knowledge you can begin to set strategy.

JT
----- Original Message -----
From: <redvobra at aol.com>
To: <detomaso at realbig.com>
Sent: Saturday, September 30, 2006 3:33 PM
Subject: [DeTomaso] detonation problems


> My Pantera has always been a little on the verge of pre-ignition. If I put
> anything but premium Chevron into the car, it'll start pinging. But
> lately, it's been happening so often that it's becoming annoying. It's
> most noticeable when the car is fully warmed up, on throttle tip in.
> Initial timing is set at 8 degrees and it has a fresh Holly 650 on it.
> Dunno why it would be getting worse unless California gas is now sucking
> even more.
>
> Any thoughts/suggestions? Should I change the timing? Go to a colder plug?
>
> Thanks,
> -Chris
>
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