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Slight valve train noise normal with hydraulic lifters?

SwedCharger67

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I have the Lunati xxxxx703LK flat tappet cam and lifter kit, Hughes roller rockers kit with 1.6 ratio, chrome moly 3/8 pushrods, 440Source Stealth heads with Compcam 927-16 springs (112 lbs @1.900, 355 lbs @ 1.200", spring rate 347 lbs/in).

Engine has been running I guesstimate 40 hours since build.

- I have a slight valve train noise with hot engine, and some more noise above 2500 rpms. I wonder if this is fairly normal or if I should check and possibly increase the pre-load a little?

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you may not have enough pre-load on the tappets. aggressive hydraulic camshaft profiles will make some noise due to the fast closing ramps. it may be the nature of the lobe profile.
 
I've got a comp xe295hl cam and it makes some noise from the high ramp profile on the cam. Alot of people say its a noisy valve train and I believe them after hearing this. I have checked valve lash twice just incase and it seems like the noise is what it is.
 
I had similar experience with a new similar set up. Resetting lash helped, but the main issue for me was that I needed some spacers (shims) between the rockers on those cylinders where the noise was coming from. Just don't get the alignment of the valve to rocker roller off. If there is no slop among the rockers on the shaft, then it should be lash related. I made an extra effort to be sure the hydraulic lifters were totally recovered before setting the lash. Hope this helps.
 
did you shim your rocker shafts with the half lift method b 4 ordering pushrods?
 
On another note...
What else is going on with the engine? I see fuel injection, I see NO distributor cap but individual coils....cool stuff!
 
Well, I built in my basement a new engine all computer controlled. Based on a 400-block a 512 with 12.4 static compression running only on E85. Stealth heads, M1 intake converted to port injection. Billet steel main caps, and girdle...(originally planned a double turbo engine...but time and costs made me change my plan...).
Old distributor is converted to a home-made cam sensor, 36-1 trigger wheel welded on the crankshaft pulley. All is home-made computer controlled by MegaSquirt MS3X...port injection, 8 coils (GM LS2 !), electric cooling fan (Volvo V70) and cooling pump (Australian pump, Jeep drive electronics), both computer controlled variable speeds depending on cooling requirements. Beefed up 727.
The engine is very powerful, spins effortlessly rear tires from low rpms. Currently running sure grip 2.93 rear, but will shift to 2.76 and 15 inch wheels since I frequently do long trips. I don't expect the shift to have any significant influence on the tire spinning...

For the future it would be nice to have MS3X control both the throttle and the 727...
 
That is some really cool stuff! Thanks for explaining.
I know that some cams are noisier than others. Sorry that I can not be of any help. Good luck.
 
Same issue with my Lunati on my Duster. Starts around 2200 rpm. Still trying to figure it out.
 
Even my stock cam 440 has a bit of valve train rumble at a hot idle.
 
I get a light ticking at hot idle even with 40 psi. I get what sounds like a pretty good weak lifter tick at around 2-2200 rpm then quiets down
 
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