Great lesson thanks! Had a HQ holden forteen years. Great engine! Question on the lifters if they are the same as in a Rover V8 theres a spring inside them. Is the oil designed to keep pressure lightly on the push rod or the spring is doing that? And i never had to adjust the clearances on the 202. My Rover has a high lift cam opening valves 500thou. Cam wear is relatively fast. Every 12000miles should adjust llifters is advised. Im sceptical...If they are adjusted correctly wont the hydraulic lifters keep ticking noise iff the valve train away? I haven't any previous experience with RV 8 my one is running really well done 48000 km and dyno shows ver high ft/lb at the wheels. With me its done 5000k trouble free. Knowing the cam and lifters are a week point thanks for teaching me about this.
The spring in the lifter maintains light pressure against pushrod. 12,000 miles sounds crazy. Once adjusted correctly, the lifters should last the life of the engine, unless the cam or lifter fails.
Do the lifters bleed down! If the engine was not running or newly built they need removing? To fill them? Is checking back lash on empty lifters is a potential problem for instance?
of course they bleed down. I have been adjusting empty lifters all my career just like in the vid. Even if you can't see the lifter & adjust by feel to remove the play, you can still be within 1/8 turn out usually in the tight direction, so no harm done there. Back in the day I always built up oil pressure first before firing the engine so all the lifters had oil in them. By the way the engine will still start when most of the lifters have bled down. They will pump up once they have oil pressure.
I gather you mean valve opening distance variations. 20 yrs ago I did the geometry exercise using a degree wheel & dial gauge, using different rockers at different geometry angles. There was only a few thou difference when the bolt difference was a qtr to half turn. In a 202 the geometry is set by the valve stem height. In this engine the relationship of correct geometry is affected by the cam base circle, lobe lift, valve stem height & pedestal height. The pushrod length only determines how far the rod will end up down the lifter bore after torquing the bolt down, it does not affect geometry at all.
Where did you get the 40 thou less rods from? I’m using std 202 9.016 and I think they’re too long for mine since the head has been shaved and I’ve got a high lift cam. Cheers
Well some of my information will be about 20yrs old. Many moons ago I got them from Lunati in USA but the ones we actually fitted which were .040" shorter came from some speed shop down south. Just do a search for pushrods & see what results you get.
I bought a cam kit recently and noticed they were including 186 length rods so I asked them to put std 202 rods in. Thought that was a bit odd really. What I don’t get here is that the manual says to torque those rocker bolts down so how can that be if there needs to be a preload? With these bridged rockers I thought the lash was correct due to the std rods being in there.
preload is not what it seems in this case. It is only setting the plunger depth into the lifter bore, there is no actual real preload, just a small tension against the internal spring. Did you not see that I went .040" shorter on the rods because the head & block were shaved. This will drive the pushrod deeper into the lifter the more that is shaved from the head & block so therefore to maintain an acceptable lifter adjustment you must fit shorter rods and all this depends on the valve stem height as well. If the builder pockets the valves then they stick up higher which will drop the rod deeper into the lifter. A bit to consider rather than just slapping everything in & torque the rocker bolt down & hope for the best.
@@mbsoldschool Yes I saw all that, I'm talking about a std head and rods. If I tension them to spec that pretty much pushes the rocker bridge to the studs they sit on, so I'm not seeing how that would allow zero lash if you get what I mean? It's either tightened solid or the threads would be exposed by loosening them.
Great video
Thanks mate.
Just put in my 202 back into my VH with yella terra bits and bobs, goes hard!
Great lesson thanks! Had a HQ holden forteen years. Great engine! Question on the lifters if they are the same as in a Rover V8 theres a spring inside them. Is the oil designed to keep pressure lightly on the push rod or the spring is doing that? And i never had to adjust the clearances on the 202. My Rover has a high lift cam opening valves 500thou. Cam wear is relatively fast. Every 12000miles should adjust llifters is advised. Im sceptical...If they are adjusted correctly wont the hydraulic lifters keep ticking noise iff the valve train away? I haven't any previous experience with RV 8 my one is running really well done 48000 km and dyno shows ver high ft/lb at the wheels. With me its done 5000k trouble free. Knowing the cam and lifters are a week point thanks for teaching me about this.
The spring in the lifter maintains light pressure against pushrod. 12,000 miles sounds crazy. Once adjusted correctly, the lifters should last the life of the engine, unless the cam or lifter fails.
Do the lifters bleed down! If the engine was not running or newly built they need removing? To fill them? Is checking back lash on empty lifters is a potential problem for instance?
of course they bleed down. I have been adjusting empty lifters all my career just like in the vid. Even if you can't see the lifter & adjust by feel to remove the play, you can still be within 1/8 turn out usually in the tight direction, so no harm done there. Back in the day I always built up oil pressure first before firing the engine so all the lifters had oil in them. By the way the engine will still start when most of the lifters have bled down. They will pump up once they have oil pressure.
Would you know by chance what the valve drop difference is with unequal rocker geometry? In this case?
I gather you mean valve opening distance variations. 20 yrs ago I did the geometry exercise using a degree wheel & dial gauge, using different rockers at different geometry angles. There was only a few thou difference when the bolt difference was a qtr to half turn. In a 202 the geometry is set by the valve stem height. In this engine the relationship of correct geometry is affected by the cam base circle, lobe lift, valve stem height & pedestal height. The pushrod length only determines how far the rod will end up down the lifter bore after torquing the bolt down, it does not affect geometry at all.
Where did you get the 40 thou less rods from? I’m using std 202 9.016 and I think they’re too long for mine since the head has been shaved and I’ve got a high lift cam. Cheers
Well some of my information will be about 20yrs old. Many moons ago I got them from Lunati in USA but the ones we actually fitted which were .040" shorter came from some speed shop down south. Just do a search for pushrods & see what results you get.
@@mbsoldschool Roger dodger.
I bought a cam kit recently and noticed they were including 186 length rods so I asked them to put std 202 rods in. Thought that was a bit odd really. What I don’t get here is that the manual says to torque those rocker bolts down so how can that be if there needs to be a preload? With these bridged rockers I thought the lash was correct due to the std rods being in there.
preload is not what it seems in this case. It is only setting the plunger depth into the lifter bore, there is no actual real preload, just a small tension against the internal spring. Did you not see that I went .040" shorter on the rods because the head & block were shaved. This will drive the pushrod deeper into the lifter the more that is shaved from the head & block so therefore to maintain an acceptable lifter adjustment you must fit shorter rods and all this depends on the valve stem height as well. If the builder pockets the valves then they stick up higher which will drop the rod deeper into the lifter. A bit to consider rather than just slapping everything in & torque the rocker bolt down & hope for the best.
@@mbsoldschool Yes I saw all that, I'm talking about a std head and rods. If I tension them to spec that pretty much pushes the rocker bridge to the studs they sit on, so I'm not seeing how that would allow zero lash if you get what I mean? It's either tightened solid or the threads would be exposed by loosening them.