Pushrods
HDF Community Team
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From: san antonio
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Road Master
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From: pontotoc ms
What I meant do they have the same base circle as Harley stock cams.
Ultimate HDF Member
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From: OH
I was under the impression that Andrews uses a slightly smaller base diameter than the stock cams. I think that what DJ and others will tell you is that by the time you figure in all the tolerances and thermal expansion you are better off using adjustables so that you can get them set correctly.
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From the Andrews instructions...
"Andrews Products 2006 Dyna and 2007 and later twin cam engines use use stock size lobe base circles for lower lift, bolt in type cams.For these cams the stock pushrods can be reused. ....Mark the pushrods so they can be replaced in their original locations since not all stock pushrods are the same length."
That said I have heard the smaller base circle comment also.
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"Andrews Products 2006 Dyna and 2007 and later twin cam engines use use stock size lobe base circles for lower lift, bolt in type cams.For these cams the stock pushrods can be reused. ....Mark the pushrods so they can be replaced in their original locations since not all stock pushrods are the same length."
That said I have heard the smaller base circle comment also.
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HDF Community Team
Joined: Jun 2006
Posts: 12,782
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From: san antonio
From the Andrews instructions...
"Andrews Products 2006 Dyna and 2007 and later twin cam engines use use stock size lobe base circles for lower lift, bolt in type cams.For these cams the stock pushrods can be reused. ....Mark the pushrods so they can be replaced in their original locations since not all stock pushrods are the same length."
That said I have heard the smaller base circle comment also.[I][B]
"Andrews Products 2006 Dyna and 2007 and later twin cam engines use use stock size lobe base circles for lower lift, bolt in type cams.For these cams the stock pushrods can be reused. ....Mark the pushrods so they can be replaced in their original locations since not all stock pushrods are the same length."
That said I have heard the smaller base circle comment also.[I][B]
I think it is important to consider all clearances when deciding whether or not OEM pushrods or adjustables should be used as well as the individual bias for one over the other. JMHO...............
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From: SF Bay area
The operative words in the above quote are "bolt in type cams"; which cams are those? The "bolt in" term used to apply to cams with lifts that did not exceed .510"; however, with the introduction of beehive springs in 2005, cams with lifts up to .570" became bolt in cams. So, considering the Andrews 57 would be a bolt in cam, it does have a base circle .020" smaller than stock so the quote from the Andrews website could be considered misleading. A .020" base circle increases the stock valve train stack up height by .010"; some run OEM pushrods with no issues and some have noise. Factory tolerances come into play here. Now consider heads are decked .030" and a .030" head gasket is used which reduces the valve train stack up height by .045" less the .010" increase via the base circle and now OEM pushrods will preload the lifter to about .135", still OK by me.
I think it is important to consider all clearances when deciding whether or not OEM pushrods or adjustables should be used as well as the individual bias for one over the other. JMHO...............
I think it is important to consider all clearances when deciding whether or not OEM pushrods or adjustables should be used as well as the individual bias for one over the other. JMHO...............
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HDF Community Team
Joined: Jun 2006
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From: san antonio
No issues for me with OEM pushrods providing the valve train stackup height will preload the lifter to .125"-.135" with OEM pushrods; that makes sense.
Last edited by djl; Jun 21, 2016 at 01:26 PM.
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