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RE: 428's bored to .040?
By Greg Westphall - 09/07/2005 3:24:07 PM; IP 12.158.13.35
My 428CJ is at .040 over. Am running the TRW forgings rated at 10.5:1 although I am not running anywhere close to that, I think it calculated out to 9.95:1 due to the deck height being well above the piston at TDC. To get to your question, I have overheating problems in traffic and on the highway. Am running 3.50 gears in a 1969 Cyclone CJ with C6 A/T and A/C. I have the factory fan clutch and fan blade but am only running a 3-core radiator. I will be switching to a 4-core over the winter. If I keep the highway speeds below 60 I am usually ok except on a very hot day. However, once I get above 65 the temperature slowly climbs. I have to back off the speed, then it will drop down. In traffic I am fine if I keep the car moving, however, I cannot idle long without overheating. I had a great deal of experience with this while driving 850 miles each way to Talladega and back from Chicago last fall for the Aero Warriors reunion. I am running 11-12 degrees initial advance and 40 degrees total advance with a full mechanical advance distributor, aluminum Performer RPM intake and cylinder heads and FPA tri-y ceramic coated headers. I suspect the aluminum heads are transferring more heat to the water jacket and the .040" overbore is allowing the same. The headers just add to the problem. I also suspect that the 4-core might not completely solve the problem. Overdrive, with a 4-core should solve the highway issues and an electric fan to boost airflow at stoplights will probably end up being the solution. I have not tried water wetter or anything like that an do not intend to.
Hope this helps,
Greg
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Collapse <a href=../ForumFE/reply.aspx?ID=15717&Reply=15717><img src=../images/reply.png width=30 height=10></a>&nbsp;<a href="#" id="anchor15717" onclick="return false;">428's bored to .040?</a>&nbsp;-- <font color=#0000ff>James, <i>12/15/2002</i></font><script type="text/javascript"> new HelpBalloon({ dataURL: 'replyb.aspx?ID=15717', contentMargin: 60, icon: $('anchor15717') }); </script>  428's bored to .040? -- James, 12/15/2002
Collapse <a href=../ForumFE/reply.aspx?ID=15721&Reply=15717><img src=../images/reply.png width=30 height=10></a>&nbsp;<a href="#" id="anchor15721" onclick="return false;">RE: 428's bored to .040?</a>&nbsp;-- <font color=#0000ff>Pete's Ponies, <i>12/15/2002</i></font><script type="text/javascript"> new HelpBalloon({ dataURL: 'replyb.aspx?ID=15721', contentMargin: 60, icon: $('anchor15721') }); </script>  RE: 428's bored to .040? -- Pete's Ponies, 12/15/2002
 RE: 428's bored to .040? -- Gary, 12/16/2002
Collapse <a href=../ForumFE/reply.aspx?ID=15734&Reply=15717><img src=../images/reply.png width=30 height=10></a>&nbsp;<a href="#" id="anchor15734" onclick="return false;">RE: 428's bored to .040?</a>&nbsp;-- <font color=#0000ff>BILL, <i>12/16/2002</i></font><script type="text/javascript"> new HelpBalloon({ dataURL: 'replyb.aspx?ID=15734', contentMargin: 60, icon: $('anchor15734') }); </script>  RE: 428's bored to .040? -- BILL, 12/16/2002
Collapse <a href=../ForumFE/reply.aspx?ID=15740&Reply=15717><img src=../images/reply.png width=30 height=10></a>&nbsp;<a href="#" id="anchor15740" onclick="return false;">RE: 428's bored to .040?</a>&nbsp;-- <font color=#0000ff>BILL, <i>12/16/2002</i></font><script type="text/javascript"> new HelpBalloon({ dataURL: 'replyb.aspx?ID=15740', contentMargin: 60, icon: $('anchor15740') }); </script>  RE: 428's bored to .040? -- BILL, 12/16/2002
Collapse <a href=../ForumFE/reply.aspx?ID=15749&Reply=15717><img src=../images/reply.png width=30 height=10></a>&nbsp;<a href="#" id="anchor15749" onclick="return false;">Bill dont start boring yet</a>&nbsp;-- <font color=#0000ff>Ross, <i>12/17/2002</i></font><script type="text/javascript"> new HelpBalloon({ dataURL: 'replyb.aspx?ID=15749', contentMargin: 60, icon: $('anchor15749') }); </script>  Bill dont start boring yet -- Ross, 12/17/2002
 RE: Bill dont start boring yet -- BILL, 12/17/2002
Collapse <a href=../ForumFE/reply.aspx?ID=15753&Reply=15717><img src=../images/reply.png width=30 height=10></a>&nbsp;<a href="#" id="anchor15753" onclick="return false;">RE: 428's bored to .040?</a>&nbsp;-- <font color=#0000ff>Mike Upton, <i>12/17/2002</i></font><script type="text/javascript"> new HelpBalloon({ dataURL: 'replyb.aspx?ID=15753', contentMargin: 60, icon: $('anchor15753') }); </script>  RE: 428's bored to .040? -- Mike Upton, 12/17/2002
 RE: 428's bored to .040? -- rusty, 08/20/2005
RE: 428's bored to .040? -- Greg Westphall, 09/07/2005
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