RPM's for stock Pushrods?, How high before you need to upgrade |
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RPM's for stock Pushrods?, How high before you need to upgrade |
justme |
Jan 31 2009, 10:02 AM
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#1
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Member Group: Members Posts: 187 Joined: 1-January 07 From: southampton ma atlantic northeast Member No.: 7,413 Region Association: North East States |
So.....
How high can you go for regular use with stock pushrods? The 1911 I'm putting together should see 5500-6000 rpmon a somewhat regular basis. Is this ok or do I need chromoly rods? What are the advantages of going with steel? Thanks, Phil |
Al Meredith |
Jan 31 2009, 06:33 PM
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#2
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Senior Member Group: Members Posts: 960 Joined: 4-November 04 From: Atlanta, ga Member No.: 3,061 |
My experience is that stock springs will only hold up until about 5000RPM I think Heavy Duty single springs will go to about 6000. Someone who knows more about this will add something I'm sure
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Jake Raby |
Jan 31 2009, 08:32 PM
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#3
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Engine Surgeon Group: Members Posts: 9,394 Joined: 31-August 03 From: Lost Member No.: 1,095 Region Association: South East States |
What dictates the omission of stock pushrods is the fact that they can't be utilized to alter valve train geometry when one of the 11+ variables that dictate the geometry are altered..
I have used stock pushrods in engines that turned 7,000 RPM back when I was too dumb to realize the risks.. Yes I had failures, but there isn't much I haven't broken over the years. You should view my camshaft and valve train presentation, then you'lkl understand component compatability better and why the stock pushrods create compromise. The general rule with valve train is "Overkill Engineering" is the best policy, when valve train parts fail its really nasty and with no apparent symptoms prior to a boom that could make your engine look like Hiroshima inside. |
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