<html><body><div style="color:#000; background-color:#fff; font-family:HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif;font-size:12pt"><div><span><br></span></div><div> A big thanks to Richard who mentioned the spark plug heat range idea.<br><br>When the shop swapped plugs during the initial post barn find tuneup , they chose the wrong heat range.<br><br>I went with the suggestion of Autolite #24s ($12 at Walmart) and set the gap to .035 as recommended by Kenne Bell. After a quick dinner time swap in my office parking garage, the result was very good.<br><br>No detonation under the conditions I described...just smooth power and 6psi of boost.<br><br>Power and response has also been improved noticeably.<br><br>All appears to be well again.<br><br>Thanks for all the suggestions.<br><br>LS<br><br><br></div><div><span class="" style="background-color:rgb(255, 255,
255);font-style:italic;font-family:symbol;"><br><br><br></span><span class="" style="font-family:Arial;color:#000000;font-size:10pt;"><div><font size="6"><span style="font-size:14pt;"><i><span style="color:#000000;"><b>central </b></span></i></span></font></div><div><i><b>wines-spirits est 1934<br></b></i></div><div><i><b><br></b></i></div><div><i><b>625 e street nw<br></b></i></div><div><i><b>washington, dc 20004</b></i></div><div><i><b><br></b></i></div><div><i><b><a rel="nofollow" target="_blank" href="http://centralwines.com/">centralwines.com</a><br></b></i></div><div><i><b><br></b></i></div><div><i><b><a rel="nofollow" target="_blank" href="http://facebook.com/CentralLiquors">facebook.com/CentralLiquors</a> <br></b></i></div><div><i><b><br></b></i></div><div><i><b>202-737-2800</b></i></div></span></div><div class="" style="color:rgb(0, 0, 0);font-size:24px;font-family:verdana, helvetica,
sans-serif;background-color:transparent;font-style:italic;"><br><span class="" style="background-color:rgb(255, 255, 255);font-style:italic;font-family:symbol;"></span></div><div class="" style="color:rgb(0, 0, 0);font-size:24px;font-family:symbol;background-color:rgb(255, 255, 255);font-style:italic;"><span class="" style="background-color:rgb(255, 255, 255);font-style:italic;font-family:symbol;"><font class="" style="font-family:verdana, helvetica, sans-serif;" size="5"><br></font></span></div><div><br></div> <div class="" style="font-family: HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif; font-size: 12pt;"> <div class="" style="font-family: HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif; font-size: 12pt;"> <div dir="ltr"> <hr size="1"> <font face="Arial" size="2"> <b><span style="font-weight:bold;">From:</span></b> richard boschert <theemonkey@yahoo.com><br> <b><span style="font-weight:
bold;">To:</span></b> detomaso mail list <detomaso@poca.com> <br> <b><span style="font-weight: bold;">Sent:</span></b> Friday, January 10, 2014 4:23 PM<br> <b><span style="font-weight: bold;">Subject:</span></b> Re: [DeTomaso] [Detomaso]Ping Ping<br> </font> </div> <div class=""><br>I have a question,has the pinging always been present when driving in the conditions you mentioned,or is it a more recent development?<br><br>If it is more recent,what has changed?Pulley swap,Quality of the fuel,aka octane,water in the fuel,distributor swapped/repaired,tune up with the wrong heat range of plugs, etc.<br><br>You can change the timing curve so that there is less advance at low rpm,but still has the total curve you want at higher rpm.This will reduce detonation,but will not be as fun to drive in the lower rpms.You can reduce compression with a thicker head gasket.<br><br>Be aware when you purchase aluminum heads of what the chamber size and volume are, as
this affects compression ratio and how the flame travels.<br><br>I have a B&M 144ci roots blower on a bone stock roller 5.0 with original iron heads,cam etc with no pinging issues under any conditions with 91 octane.It is in a mustang so the load is lighter,but i have run as much as 10 lbs of boost with no detonation.With its current 5 pounds of boost my timing is all in at 2000 rpm with a total of 32 degrees.With 10 pounds i had it all in at 2800 rpm with a total of 26 degrees.<br><br>You will make more power with boost than timing,but risk of other parts breaking is higher.If you go aluminum heads i highly recommend AFR heads.The earlier 5.0's pistons are different than the later so check the year of your engine.If it is early(i believe 1986,but check with the head manufacture,you will need to notch the pistons for valve clearance)<br><br>Good luck,Richard<br><br>_______________________________________________<br><br>Detomaso Forum Managed by
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