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techtalk:ref:engmech01v [2025/08/07 02:19] – [Solids vs Hydraulics and Pushrod Types] hippysmacktechtalk:ref:engmech01v [2025/08/07 02:52] (current) – [Solids vs Hydraulics and Pushrod Types] hippysmack
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 === When are applications where you can't use a stock lifter? === === When are applications where you can't use a stock lifter? ===
 When you run out of tappet anti-rotation pin clearance. Red Shift 585's have stock base circles and typically require an aftermarket tappet that has longer anti-rotation flats. SE 575's have almost as much lift, but they have a smaller than stock base circle, so they typically don't cause tappet pin clearance issues. ((https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-motor-engine/sportster-motorcycle-motor-top-end/27298-adjustable-vs-solid-pushrod))  When you run out of tappet anti-rotation pin clearance. Red Shift 585's have stock base circles and typically require an aftermarket tappet that has longer anti-rotation flats. SE 575's have almost as much lift, but they have a smaller than stock base circle, so they typically don't cause tappet pin clearance issues. ((https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-motor-engine/sportster-motorcycle-motor-top-end/27298-adjustable-vs-solid-pushrod)) 
 +
 +=== What is the advantage of using non-adjustable pshrods? ===
 +A non-adjustable pushrod is stronger at a given weight and also less likely to cause "rub" issues, which can be a source of noise. Also, you reduce the potential for leaks by using the stock pushrod tubes instead of collapsibles. 
  
 === When do you stop using fixed pushrods and switch to adjustables? === === When do you stop using fixed pushrods and switch to adjustables? ===
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 The Hydrosolid is a nice solution for someone who wants the valvetrain control of a solid (especially at high rpm) with the self-adjusting convenience of a hydraulic. They do require adjustable pushrods and collapsible covers, but they'll take a lot less maintenance and run a lot quieter than a solid. ((https://www.xlforum.net/forum/vendors/nrhs-high-performance/41168-adjustable-pushrods-and-solid-lifters#post844954)) \\ The Hydrosolid is a nice solution for someone who wants the valvetrain control of a solid (especially at high rpm) with the self-adjusting convenience of a hydraulic. They do require adjustable pushrods and collapsible covers, but they'll take a lot less maintenance and run a lot quieter than a solid. ((https://www.xlforum.net/forum/vendors/nrhs-high-performance/41168-adjustable-pushrods-and-solid-lifters#post844954)) \\
 +
 +The quickest and surest way to determine if you have travel limiters is to take them apart. There's a snap ring on the top and they just come apart. The travel limiter is a little steel ring down in the bottom. Personally, I really like Hydrosolids, and use them in all my race motors. Travel limited hydraulic lifters give the benefits of each type. Overkill for most street motors with moderate spring pressures though, and they incur a lot of extra expense by the time you get adjustable pushrods and a collapsible tube kit. ((https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-motor-engine/sportster-motorcycle-engine-conversions/59164-i-think-i-screwed-up-with-new-cam-install/page3#post1251154)) \\ 
 ====== Tappet Flats ====== ====== Tappet Flats ======
 **This is in consideration of induced noise from the use of high lift cams**. \\ **This is in consideration of induced noise from the use of high lift cams**. \\

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