[DeTomaso] Thus quoth the raven...(IE what's that tapping?)

Christopher Kimball chrisvkimball at msn.com
Sat Dec 18 12:27:10 EST 2010


Good points, I'll check it out.

Thanks,

Chris

> From: mbefthomas at comcast.net
> To: chrisvkimball at msn.com; detomaso at realbig.com
> Subject: RE: [DeTomaso] Thus quoth the raven...(IE what's that tapping?)
> Date: Sat, 18 Dec 2010 09:23:22 -0800
> 
> Chris, I'd check to be sure your exhaust headers are tight.  Remember you
> have aluminum heads so I'm not sure how much torque you can put on them to
> check, but as said in another email, a ticking like that under acceleration
> can mean a slight "blow-by" of the exhaust header gasket if it's not
> entirely tight.
> 
> One way to check for exhaust leak if you can't hear it at idle is to check
> with a flashlight all around both header flanges for any blackened areas of
> the blue Ford paint.  That's your first sign of the leak.
> 
> By the by, what type of exhaust header gasket are you using?  Seems to me I
> remember picking you up a set of the same crappy paper ones I originally got
> from Stan's Headers in Auburn.  I've since blown both of mine out, and have
> replaced with a very cool multi-layered aluminum gasket that Doug Braun
> picked up at Summit a couple of years ago when we were in Reno, and I popped
> the first gasket the day before we were due to head home.
> 
> Good luck, Mike 
> 
> -----Original Message-----
> From: detomaso-bounces at realbig.com [mailto:detomaso-bounces at realbig.com] On
> Behalf Of Christopher Kimball
> Sent: Thursday, December 16, 2010 8:22 PM
> To: Pantera List Serve
> Subject: [DeTomaso] Thus quoth the raven...(IE what's that tapping?)
> 
> 
> I started up Pandora today (it was finally dryish outside) and took her out
> for a spin.  I gave her some hard acceleration in higher gears to listen for
> knocking, and all I heard was a slight tapping, as if a small screwdriver
> was being tapped against the block.  I was told that if I heard a knock I
> should turn the distributor a little bit clockwise until I could accelerate
> hard with no knock.  I turned it a little, but it didn't make much, if any,
> difference.  I continued doing this a tiny bit at a time until the car just
> didn't run well.  The little tapping was still there under all those
> circumstances.
> 
> I then rotated the distributor back to where it was (maybe even a bit
> further counter clockwise) and then when I punched it I heard the kind of
> ping/clack that I remember our old Chevy station wagon used to make when I
> would floor it (my dad called it "pinging").
> 
> I'm wondering if the slight tapping noise I'm hearing isn't really "knock"
> at all, but just the normal sound of the engine, but the louder sound I
> heard is the real knocking, and if I turn the distributor enough to
> eliminate the loud noise and live with the slight tapping noise I'll be OK.
> I know hearing the actual knocking in an engine is bad news, and I don't
> want to mess something up.
> 
> Any comments?
> 
> Thanks (again),
> 
> Chris
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