FlDart360
Well-Known Member
No, I just was surprised to see something other than a 5/16 pushrod, and was curious why someone might do such a thing.Are you thinking about a change because of noise? is there a problem?
No, I just was surprised to see something other than a 5/16 pushrod, and was curious why someone might do such a thing.Are you thinking about a change because of noise? is there a problem?
Wow, 53% less deflection from what appears to be a small increase in diameter and wall thickness. That speaks volumes.""Is anyone using the 5/16" (heavy wall, Manton Grade 3 or Manton Grade 5) pushrods on solid roller valve springs (220lbs/540lbs) for reference?""
I just got a reply from Manton on which size of pushrod they would recommend for a spring spec of 230lbs/540lbs, @ apx 7.850" long and 6400rpms. They recommended their 5/16" x .118" in a 5 series [275k psi], or the 11/32" x .120" in the same series would deflect 53% less under the same load.
More room. The cam i ran those with was actually 699/672
Pushrod weight isn't a factor. The bigger diameter pushrod doesn't weight as much of a percentage heavier as you would think. And its way more than negated by the stability it creates.
In short, in any performance application, jam in as big a pushrod as will fit
Is there an issue of harmonics then?
""Is anyone using the 5/16" (heavy wall, Manton Grade 3 or Manton Grade 5) pushrods on solid roller valve springs (220lbs/540lbs) for reference?""
I just got a reply from Manton on which size of pushrod they would recommend for a spring spec of 230lbs/540lbs, @ apx 7.850" long and 6400rpms. They recommended their 5/16" x .118" in a 5 series [275k psi], or the 11/32" x .120" in the same series would deflect 53% less under the same load.
Yes. Pushrods flexing will induce every manner of harmonic you can think of. I’ve seen it make an oil filter unscrew and fall off.