Skip Navigation Links
Setup
New Post
Search
Forum Home
Home
Decoder

Original Message
428 Shelby Engine "pings"
By Steve Boulay - 06/14/2001 2:30:17 PM; IP 161.114.88.72
My 428...'67 Shelby runs well but "pings" under heavy load. I've set the timing conservatively(I think.....12 deg. initial) and added enough lead additive (LS 130) to bring the octane level to somewhere between 98-100.
The timing (according to a vacuum gauge) is "late" and the engine runs better at idle if I push it farther ahead, but of course, the "ping" gets worse under acceleration. I'd like to run more initial timing to improve power brake booster signal, but not until I get this sorted out. I'm wondering if the centrifugal advance curve in the distributor is accessive, or if something else is amiss. I'm not sure, but I think the engine is nearly original (comp. ratio,...cam etc....)
I've also adjusted the vacuum advance to limit that part of the curve, I could pull that back more if it would help. Any insights from the experts will be appreciated..........Also,
is there a "reasonably" easy way to accurately verify whether or not the timing ring on the damper has slipped?
What effect would a stretched timing chain have on this symptom?
Thanx,
SGB
This thread, so far...
Skip Navigation Links.
Collapse <b>428 Shelby Engine "pings"</b>&nbsp;-- <font color=#0000ff>Steve Boulay, <i>06/14/2001</i></font>428 Shelby Engine "pings" -- Steve Boulay, 06/14/2001
Collapse <a href=../ForumFE/reply.aspx?ID=6849&Reply=6848><img src=../images/reply.png width=30 height=10></a>&nbsp;<a href="#" id="anchor6849" onclick="return false;">Vacuum advance? What distributor's on there? [n/m]</a>&nbsp;-- <font color=#0000ff>Mr F, <i>06/14/2001</i></font><script type="text/javascript"> new HelpBalloon({ dataURL: 'replyb.aspx?ID=6849', contentMargin: 60, icon: $('anchor6849') }); </script>  Vacuum advance? What distributor's on there? [n/m] -- Mr F, 06/14/2001
Collapse <a href=../ForumFE/reply.aspx?ID=6850&Reply=6848><img src=../images/reply.png width=30 height=10></a>&nbsp;<a href="#" id="anchor6850" onclick="return false;">RE: Vacuum advance? What distributor's on there? [n/m]</a>&nbsp;-- <font color=#0000ff>Steve Boulay, <i>06/14/2001</i></font><script type="text/javascript"> new HelpBalloon({ dataURL: 'replyb.aspx?ID=6850', contentMargin: 60, icon: $('anchor6850') }); </script>  RE: Vacuum advance? What distributor's on there? [n/m] -- Steve Boulay, 06/14/2001
 Yep. OEM unit was dual point, mechanical.[n/m] -- Mr F, 06/14/2001
 RE: Vacuum advance? What distributor's on there? [n/m] -- richard, 06/15/2001
Collapse <a href=../ForumFE/reply.aspx?ID=6873&Reply=6848><img src=../images/reply.png width=30 height=10></a>&nbsp;<a href="#" id="anchor6873" onclick="return false;">RE: 428 Shelby Engine "pings"</a>&nbsp;-- <font color=#0000ff>BOB HOPKINS, <i>06/15/2001</i></font><script type="text/javascript"> new HelpBalloon({ dataURL: 'replyb.aspx?ID=6873', contentMargin: 60, icon: $('anchor6873') }); </script>  RE: 428 Shelby Engine "pings" -- BOB HOPKINS, 06/15/2001
Collapse <a href=../ForumFE/reply.aspx?ID=6876&Reply=6848><img src=../images/reply.png width=30 height=10></a>&nbsp;<a href="#" id="anchor6876" onclick="return false;">Not surprisingly, GT500 was unique in having 428 w/ dual point. [n/m]</a>&nbsp;-- <font color=#0000ff>Mr F, <i>06/15/2001</i></font><script type="text/javascript"> new HelpBalloon({ dataURL: 'replyb.aspx?ID=6876', contentMargin: 60, icon: $('anchor6876') }); </script>  Not surprisingly, GT500 was unique in having 428 w/ dual point. [n/m] -- Mr F, 06/15/2001
Collapse <a href=../ForumFE/reply.aspx?ID=6879&Reply=6848><img src=../images/reply.png width=30 height=10></a>&nbsp;<a href="#" id="anchor6879" onclick="return false;">RE: Not surprisingly, GT500 was unique - a 428PI w/ dual point. [n/m]</a>&nbsp;-- <font color=#0000ff>BOB HOPKINS, <i>06/15/2001</i></font><script type="text/javascript"> new HelpBalloon({ dataURL: 'replyb.aspx?ID=6879', contentMargin: 60, icon: $('anchor6879') }); </script>  RE: Not surprisingly, GT500 was unique - a 428PI w/ dual point. [n/m] -- BOB HOPKINS, 06/15/2001
 RE: Not surprisingly, GT500 was unique.... [n/m] -- Kevin Marti, 06/18/2001
Collapse <a href=../ForumFE/reply.aspx?ID=6880&Reply=6848><img src=../images/reply.png width=30 height=10></a>&nbsp;<a href="#" id="anchor6880" onclick="return false;">RE: 428 Shelby Engine "pings"</a>&nbsp;-- <font color=#0000ff>Steve Boulay, <i>06/15/2001</i></font><script type="text/javascript"> new HelpBalloon({ dataURL: 'replyb.aspx?ID=6880', contentMargin: 60, icon: $('anchor6880') }); </script>  RE: 428 Shelby Engine "pings" -- Steve Boulay, 06/15/2001
 RE: 428 Shelby Engine "pings" -- BOB HOPKINS, 06/15/2001
 Look for cast & stamped info, like this.... -- Mr F, 06/15/2001
Collapse <a href=../ForumFE/reply.aspx?ID=6888&Reply=6848><img src=../images/reply.png width=30 height=10></a>&nbsp;<a href="#" id="anchor6888" onclick="return false;">RE: 428 Shelby Engine "pings"</a>&nbsp;-- <font color=#0000ff>Will, <i>06/15/2001</i></font><script type="text/javascript"> new HelpBalloon({ dataURL: 'replyb.aspx?ID=6888', contentMargin: 60, icon: $('anchor6888') }); </script>  RE: 428 Shelby Engine "pings" -- Will, 06/15/2001
Collapse <a href=../ForumFE/reply.aspx?ID=6922&Reply=6848><img src=../images/reply.png width=30 height=10></a>&nbsp;<a href="#" id="anchor6922" onclick="return false;">RE: 428 Shelby Engine "pings"</a>&nbsp;-- <font color=#0000ff>Steve Boulay, <i>06/19/2001</i></font><script type="text/javascript"> new HelpBalloon({ dataURL: 'replyb.aspx?ID=6922', contentMargin: 60, icon: $('anchor6922') }); </script>  RE: 428 Shelby Engine "pings" -- Steve Boulay, 06/19/2001
 RE: 428 Shelby Engine "pings" -- Will, 06/19/2001
 RE: 428 Shelby Engine "pings" -- 32 valve, 06/16/2001
 RE: 428 Shelby Engine "pings" -- Rick Croom, 06/26/2001
Post A Response
Name:
Email Address:
Subject:
Post:
Upload Image:
Human Check:   Enter the code 202511451 in the box