Is there any differance in push rods for a solid lifter than a Hyd lifter? This is the first time I have built a motor with solid lifters.
Kind of a loaded question. There might or might not be depending on what you have now. Remember the valve springs for solid roller are quite a bit stiffer and they'll need a push rod as big as you can get it. Stockers won't cut it for very long. I use comp one piece pushrods, but others are using 3/8" swaged end pushrods in similar engines. Wondering if I shouldn't change, but at the same time I've never once had a problem so who knows? As long as the length is proper and the ends are the correct diameter for the lifter and rocker arm there isn't really much difference...as long as the strength is there
As MavMan said..................it's a loaded question. I had Crower 3/8 push rods with .080 wall thickness in mine and the solid roller was a .704 lift and used pretty stiff springs...........never had a problem. Now, with that said you really need to find out the correct length for your geometry......................that means purchasing an adjustable push rod from any number of vendors and doing the geometry yourself to make sure you get the right length..................just another part of blueprinting a motor.......IMHO
I already have the pushrods from when it had a Hyd cam in it. The geometry is good. I only have a .600 lift cam so it should work.
Lift means very little. Spring pressure does though. Solid rollers are hard on parts compared to hydraulic. As long as everything's up to snuff, they're fine but if it's questionable, you'll find the weak link pretty quickly.
Find another machine shop! 125 is not NEAR enough for a solid roller. That's about half of the seat pressure most solid rollers need. You'd be looking for about 220-250 lbs on the seat more than likely. Whats the cam manufacturer suggest for springs?
It's not a roller. It's a flat tappet. Does that make a differance? The shop said these springs will work fine for my set up.
I would think for a flat tappet cam the 125 seat pressure should be fine for 6500. My old cam was a Crower E-20104, .704 lift and Dave Crower told me that the recommended VascoJet springs should have 200lb seat pressure and 610lb open. When the motor was pulled down the springs were in the 180lb range and yet the tired motor pushed the Maverick to a 9.801/133..........go figure.
Someday I hope to be in the 10s. Wont be for a while. Im going to start getting parts togeather and hope the wife doesnt notice..LOL First big buy will be the dart block.
they'll be ok. Still not much seat pressure, IMO, but they should "work". Dunno where I got the idea you were going solid roller? Brain fart maybe? Although if it were me and I was planning, I'd skip right over a solid flat tapped & just plan on a solid roller. Nothing wrong with solid flat tappets but they just don't perform like a solid roller can. Lobe profile limitations.
True about the rollers. much better. this was a budget build and I decided to try a solid cam for the first time. After the last motor blew up after 24 passes, (it was not built by me) i didnt have much money to work with. Got less than 3K in this one. threw away over 4K on the last one. It sucks but thats racing.
