Yes, have a professional do it for you....Well, had a moment to play with it. Backed out all the lifter preload, still can't get the intake valve to seal at the proper time.
I ended up hooking up the leak down tester and running only like 20 psi of air in to the cylinder. Enough to hear it but not enough to do the actual test. I then slowly spun the engine around by hand, several revolutions, both listening to the hissing and, since I don't have the intake manifold on, watching the lifters raise and fall. Also, I decided to try it on the the worst cylinder. The one that had the previous leak down test of 72psi being put in and only reading 20 psi staying in.
As I turned the crank, very slowly, there is one very small moment where the intake valve seals and no air comes out of the runner, but, instantly, the exhaust opens and the air starts coming out of exhaust. Even looking at the 4 stroke animations, it seems there should be a good amount of time that both intake and exhaust valves are sealed as the piston compresses the mixture. I don't have that.
Here are some things I'm thinking-- before I pull the head off.
1. The heads came from marketplace with the TFS stronger springs already installed. I took them off during cleaning, re-measured the height and re-shimmed as required. If I recall, most places required 1 more 0.015 shim then they previously had. Could I have messed something up here that would cause my issue?
2. In the TFS spring instructions, it said the keepers for the springs come in 2 bags-- 1 for exhaust, one for intake. The keepers were already on the valves when I got the heads. Could the previous owner have mixed them up? Would that cause my issue?
3. Can the cam be so much defective that it doesn't open/close the valves at the right time? Does that even happen?
Any other ideas? Thank you!
Ideally, you don't want your injector duty cycle to be at or near 100%, which is why LMR says they're good for 285 horses. I think that is around 85% duty cycle. I wouldn't be surprised if you and I surpass 285HP with a combo like this but its not going to be much more at all, probably around 300HP max.Thank you. I keep seeing that stock is good to like 340 horses. I can't imagine being close to that. LMR.com seems to think the 19lb injectors are good to like 285 horses. Anyway, I pulled the trigger and bought the ebay set. Now we wait.
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