Quote:
Originally Posted by aaberg
I have rebuilt my L99 engine. Removed AFM but kept VVT and installed Comp cam kit stage 1 for this setup (the kit included hydraulic rollers, springs and pushrods etc). Link: https://www.summitracing.com/parts/cca-mk189-301-13
I also installed a Melling high volume pump for better oil pressure. I Kept original valve tray with reducer valve. After reading that some said to plug and other said not to plug.
After rebuilt everything I started the engine for first time this evening and got two questions:
1. After running the engine for about 20 minutes, there is a ticking sound that seems to come from the cylinder head covers (lifters?). Sounds like the same as from mechanic lifters. Since there are no adjustments on this kit it, I guess the lifters not have got enough oil pressure yet? So how long will it take to get full pressure in the lifters? Or any other ideas what makes the sound and what to do?
2. I was hoping that Mellings HV oil pump and removing the AFM had bring more oil pressure but on idle 500 rpm I only have about 15 psi with hot engine (5-30 oil). At 2000 rpm I have 50 psi. I have read in other post that some also have low pressure and lowest pressure regarding GM spec are 6 psi! Any ideas why so low oil pressure on idle on a new rebuild engine with Melling HV? Can it be the valve train pressure relief valve that I didn't plug? |
After 20 minutes your lifters are as primed as they are ever gonna be. The Ls engines in general are know for a “type writer” type of tick which is pretty normal. Maybe you can post a video of the sound?
__________________
ABM #2399 2SS/RS:SOLD
ABM #93 2SS/RS Black Rally stripes, Titanium Interior 4,000 miles: GM GFX side skirts and diffuser waiting on paint, GM dovetail, GM heritage, RPI ZL1 style splitter.
‘87 IROC-Z Iroc blue. all original unmolested with 50K miles.
|