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Steel Pushrods

Hi chris,

Rollerlifters/ tappets are allready being used in the 2valve millepercento engine of giuseppe ghezzi and ing. Giuseppe mariani.
Personally i think that 7075 t-treated (T7? As tintin recommended) pushrods should be fully sufficient as the spring values of guzzis are not that high in comparison to lets say V8 race engines that use hardened chromo rods also for the guide plates they use.
Definitely an idea worth following would be your comment on increasing the diameter as the added diameter adds significantly to buckling resistence.
Anybody out there that would like to do some buckling load calculations for comparison??? ;) :mrgreen:

Btw. Thanks for the 126 tappet tip as i will look into that.

Kind regards

Christian
 
Rollerlifters/ tappets are allready being used in the 2valve millepercento engine of giuseppe ghezzi and ing. Giuseppe mariani.
Click to expand...

I don't know about the millepercento engine but I think Dr. John also went there. I might be wrong of course but I seem to remember seeing an article in Cycle that suggested that. The cam profile was a Harley one by Crane? which if true is not surprising given the same hemi arrangement and the huge number of profiles available. Or I may be imagining all this.

George looked at the 126 tappets - they are the correct diameter and length but have a larger radius for the pushrod and are $15 bucks a pop. If you are going to make pushrods or have them made not a big deal. Given that they are purely in compression I don't know if the radius matters or maybe a simple bush would sort it out.

I made my own pushrods for my lemans as the originals seemed to show cracking at the ends. From memory I used solid 7075 bar and went up in diameter. Don't know if they make more horsepower but they seem quieter.

I don't think there is any gain to be had in roller tipped tappets or using roller bearings on the rocker shaft. It makes sense for any american V8 SBC as the original arrangement is , as ingenious as it is, not made for high RPM/loads.
 
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