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10-20-2015, 10:56 AM | #21 |
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Join Date: Nov 2012
Location: Wichita KS
Posts: 16,132
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Re: blower motor cam recommendation
A little low on the RPMs for me, but shouldn't have been that bad. Time spent setting the timing could be the culprit, the first few minuites are the most critical. I get the timing close enough to get them started, keep the RPMs up, varying it around for 15-20 min, then check the timing.
Last edited by JSeery; 10-20-2015 at 11:35 AM. |
10-20-2015, 08:56 PM | #22 |
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Join Date: Oct 2011
Location: Gloucester VA
Posts: 1,042
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Re: blower motor cam recommendation
Look through this thread. Good oil pressure indicated but previously modified oil passage causing starvation.
https://www.fordbarn.com/forum/showthread.php?t=38439 Lonnie |
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10-21-2015, 06:09 AM | #23 |
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Join Date: May 2010
Location: Deep DEEP South
Posts: 223
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Re: blower motor cam recommendation
I agree the rpm during break in is a little - you need splash lubrication that a higher rpm will provide. Always worry about "idea" timing later in the piece; the goal is to get the rpm up pronto and get oiling to the parts that are breaking in asap.
I have broken in both milder, "mid" range and "big" cams in FHs in both /NA and blower engines, always at 2K rpm and varying from 1800 - 2200 to mix it up/vary the break in on the cam/lifters. Never had an issue - perhaps the diff in rpm made all the difference? BFD |
10-21-2015, 08:16 AM | #24 | |
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Join Date: Jan 2011
Location: Central Ohio
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Re: blower motor cam recommendation
Quote:
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10-21-2015, 02:33 PM | #25 |
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Join Date: Jul 2010
Posts: 136
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Re: blower motor cam recommendation
My '34 coupe has a 296" 3/4 Potvin cam with SS Chev valves. I am running a B&M 144 blower at 5psi. MSD ignition with boost retard. This engine was built by Mark at Motor City Flathead in 1998. It now has 25,000 miles with no problems. This engine pulls like a freight train and I run it regular to 6000 rpm. Mark Kirby did a lot of research and came up with the Potvin, I believe Flathead Jack carries these cams..
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