Skip Navigation Links
Setup
New Post
Search
Forum Home
Home
Decoder

Original Message
Yes, etm, but...
By John - 04/23/2001 8:29:59 PM; IP 142.177.67.41
Gosh, this is getting more like a chat line than a tech forum, but here goes again. Yes ETM, Smokey Yunick says synthetic is very tolerant of air bubbles in the oil, and I agree. Of course then there is break-in where you should use mineral oil. But the question I have is still not answered. It is most likely that since your stock oil pump driveshaft broke, that it was not an after-market "guarenteed for life" job. Therefore I suspect that your engine is either stock or rebuilt to stock specs. So, your bearing clearances are most likely within the factory spec of 0.0005 to 0.0015" for which a thinner oil might be appropriate. For those wildy high revving "flexible" cranks, Ford specs were increased to 0.0031 max for the 427 and 0.0025 for the Police 428, but no-where can I find out what viscosity oil is appropriate. All the old school of thought says 20W50 with the larger clearances, and the new school of thought is 10W30 with standard clearances. And me...chuckle...I like the sound of 10W30 for drainback purposes and the larger bearing clearances for flexing tolerance. Any other inputs?

ps: fast oil drainback is important in a 428 FE running approx 480Hp in a 2500lb car...you don't want teh "G's" to stack that oil up against the back of the pan when accelerating and let that little air bubble in. A Mustang would be much heavier, therefore less prone to this problem.
This thread, so far...
Skip Navigation Links.
Collapse <a href=../ForumFE/reply.aspx?ID=6002&Reply=6002><img src=../images/reply.png width=30 height=10></a>&nbsp;<a href="#" id="anchor6002" onclick="return false;">OIL Viscosity</a>&nbsp;-- <font color=#0000ff>John, <i>04/18/2001</i></font><script type="text/javascript"> new HelpBalloon({ dataURL: 'replyb.aspx?ID=6002', contentMargin: 60, icon: $('anchor6002') }); </script>  OIL Viscosity -- John, 04/18/2001
Collapse <a href=../ForumFE/reply.aspx?ID=6062&Reply=6002><img src=../images/reply.png width=30 height=10></a>&nbsp;<a href="#" id="anchor6062" onclick="return false;">RE: OIL Viscosity</a>&nbsp;-- <font color=#0000ff>richard, <i>04/22/2001</i></font><script type="text/javascript"> new HelpBalloon({ dataURL: 'replyb.aspx?ID=6062', contentMargin: 60, icon: $('anchor6062') }); </script>  RE: OIL Viscosity -- richard, 04/22/2001
Collapse <a href=../ForumFE/reply.aspx?ID=6066&Reply=6002><img src=../images/reply.png width=30 height=10></a>&nbsp;<a href="#" id="anchor6066" onclick="return false;">RE: OIL Viscosity</a>&nbsp;-- <font color=#0000ff>FE427TP, <i>04/22/2001</i></font><script type="text/javascript"> new HelpBalloon({ dataURL: 'replyb.aspx?ID=6066', contentMargin: 60, icon: $('anchor6066') }); </script>  RE: OIL Viscosity -- FE427TP, 04/22/2001
Collapse <a href=../ForumFE/reply.aspx?ID=6073&Reply=6002><img src=../images/reply.png width=30 height=10></a>&nbsp;<a href="#" id="anchor6073" onclick="return false;">10W40 may be Problem Oil</a>&nbsp;-- <font color=#0000ff>John, <i>04/22/2001</i></font><script type="text/javascript"> new HelpBalloon({ dataURL: 'replyb.aspx?ID=6073', contentMargin: 60, icon: $('anchor6073') }); </script>  10W40 may be Problem Oil -- John, 04/22/2001
Collapse <a href=../ForumFE/reply.aspx?ID=6075&Reply=6002><img src=../images/reply.png width=30 height=10></a>&nbsp;<a href="#" id="anchor6075" onclick="return false;">RE: 10W40 may be Problem Oil</a>&nbsp;-- <font color=#0000ff>RJP, <i>04/22/2001</i></font><script type="text/javascript"> new HelpBalloon({ dataURL: 'replyb.aspx?ID=6075', contentMargin: 60, icon: $('anchor6075') }); </script>  RE: 10W40 may be Problem Oil -- RJP, 04/22/2001
Collapse <a href=../ForumFE/reply.aspx?ID=6085&Reply=6002><img src=../images/reply.png width=30 height=10></a>&nbsp;<a href="#" id="anchor6085" onclick="return false;">RE: 10W40 may be Problem Oil</a>&nbsp;-- <font color=#0000ff>etm63, <i>04/23/2001</i></font><script type="text/javascript"> new HelpBalloon({ dataURL: 'replyb.aspx?ID=6085', contentMargin: 60, icon: $('anchor6085') }); </script>  RE: 10W40 may be Problem Oil -- etm63, 04/23/2001
Collapse <b>Yes, etm, but...</b>&nbsp;-- <font color=#0000ff>John, <i>04/23/2001</i></font>Yes, etm, but... -- John, 04/23/2001
Collapse <a href=../ForumFE/reply.aspx?ID=6088&Reply=6002><img src=../images/reply.png width=30 height=10></a>&nbsp;<a href="#" id="anchor6088" onclick="return false;">Try running 5W-50 Mobil1 or 15W-50 Mobil1</a>&nbsp;-- <font color=#0000ff>Dave Shoe, <i>04/23/2001</i></font><script type="text/javascript"> new HelpBalloon({ dataURL: 'replyb.aspx?ID=6088', contentMargin: 60, icon: $('anchor6088') }); </script>  Try running 5W-50 Mobil1 or 15W-50 Mobil1 -- Dave Shoe, 04/23/2001
Collapse <a href=../ForumFE/reply.aspx?ID=6090&Reply=6002><img src=../images/reply.png width=30 height=10></a>&nbsp;<a href="#" id="anchor6090" onclick="return false;">RE: Try running 5W-50 Mobil1 or 15W-50 Mobil1</a>&nbsp;-- <font color=#0000ff>John, <i>04/23/2001</i></font><script type="text/javascript"> new HelpBalloon({ dataURL: 'replyb.aspx?ID=6090', contentMargin: 60, icon: $('anchor6090') }); </script>  RE: Try running 5W-50 Mobil1 or 15W-50 Mobil1 -- John, 04/23/2001
 Drainback during break-in shouldn't be an issue. -- Dave Shoe, 04/24/2001
Collapse <a href=../ForumFE/reply.aspx?ID=6086&Reply=6002><img src=../images/reply.png width=30 height=10></a>&nbsp;<a href="#" id="anchor6086" onclick="return false;">I Agree RJP</a>&nbsp;-- <font color=#0000ff>John, <i>04/23/2001</i></font><script type="text/javascript"> new HelpBalloon({ dataURL: 'replyb.aspx?ID=6086', contentMargin: 60, icon: $('anchor6086') }); </script>  I Agree RJP -- John, 04/23/2001
 RE: I Agree RJP -- richard, 04/24/2001
 RE: OIL Viscosity -- Joe Chew, 04/24/2001
Post A Response
Name:
Email Address:
Subject:
Post:
Upload Image:
Human Check:   Enter the code 202510476 in the box