pushrods
11-16-2016, 05:39 PM
#2
From memory, the pushrods are metric and have a gauge length of approximately 7.385". I did have the weights but can't seem to find them as it was about 10 years ago when I did the first swap. Diameter is approximately 5/16".
Not sure why you are seeking this data, but weight on the lifter side isn't as critical as the valve side. However stiffness is very important to prevent valve bounce, so larger OD is the most important attribute as opposed to thickness. Hardened pushrods don't buy any stiffness.
Not sure why you are seeking this data, but weight on the lifter side isn't as critical as the valve side. However stiffness is very important to prevent valve bounce, so larger OD is the most important attribute as opposed to thickness. Hardened pushrods don't buy any stiffness.
11-17-2016, 12:39 AM
#3
TECH Apprentice
Thread Starter
well, im upgrading the valvetrain and would like to make a judgement on whats out there. several wall thicknesses available and i would like to compare without having to cut them .
surprisingly a manufacturer more or less advised against tapered pushrods. these things are heavy, so even if on the short side of the rocker i guess the weight matters in the end.
surprisingly a manufacturer more or less advised against tapered pushrods. these things are heavy, so even if on the short side of the rocker i guess the weight matters in the end.
11-17-2016, 04:53 AM
#4
I am running tapered pushrods without an issue. Increasing thickness of the pushrod wall will only get you a few percent increase in stiffness. The OD is where additional stiffness can be achieved. Of course once you start increasing weight on either side, the stock valve springs will need to be upgraded. I looked at this a little closer several years ago, here is a link to what I came up with----->Pushrod Stiffness
11-18-2016, 01:14 AM
#5
TECH Apprentice
Thread Starter
thanks. i have seen that and i wondered if the 5/16x0.080 was close to stock. so actually the benefits of going with a thicker wall on a 3/8 tapered one are limited, although the results are a little over my head.
Last edited by Dian; 11-21-2016 at 11:58 PM.
11-18-2016, 05:57 AM
#6
Here are the results from a 5/16" 0.080 baseline:
11/32”, 0.120” wall: 59% greater
3/8”, 0.080” wall: 92% greater
3/8”, 0.135” wall: 122% greater
3/8”-5/16”, 0.080” wall, double tapered: 72% greater
3/8”-5/16”, 0.135” wall, double tapered: 97% greater
The thicker wall on the 3/8 double taper provides some gain over the thinner wall. One reason I went with the thicker wall vs. the thinner is that the thicker wall Trend pushrods are machined from one piece of billet steel. If you are unsure if they will fit (I was but rolled the dice), the most have found the Manton 11/32 fit even stock heads. You should find quite a bit of information with a search as I think there are a number of guys running that setup.
11/32”, 0.120” wall: 59% greater
3/8”, 0.080” wall: 92% greater
3/8”, 0.135” wall: 122% greater
3/8”-5/16”, 0.080” wall, double tapered: 72% greater
3/8”-5/16”, 0.135” wall, double tapered: 97% greater
The thicker wall on the 3/8 double taper provides some gain over the thinner wall. One reason I went with the thicker wall vs. the thinner is that the thicker wall Trend pushrods are machined from one piece of billet steel. If you are unsure if they will fit (I was but rolled the dice), the most have found the Manton 11/32 fit even stock heads. You should find quite a bit of information with a search as I think there are a number of guys running that setup.