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| | | | Joined: May 2010 Posts: 18 New Guy | | New Guy Joined: May 2010 Posts: 18 | There is no oil getting to the valve side of the rocker arm assembly on my 235. There is plenty of oil getting to the push rod side and coming out of the holes on the rocker arms. I set intakes to .008 and exhaust to .020. Any suggestions or ideas as to why this is happening?
Last edited by NSchonfe; 05/01/2011 9:48 PM.
| | | | | Joined: Aug 2005 Posts: 6,377 Ex Hall Monitor | | Ex Hall Monitor Joined: Aug 2005 Posts: 6,377 | You're pretty loose on your exhaust lash (should be .013) and a tad loose on your intake (sb .006). If you're getting oil out of the top of the rockers you're good to go. You'll get enough splash & oil vapor to keep everything kosher when the engine is up to speed and hot.
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| | | | | Joined: May 2010 Posts: 18 New Guy | | New Guy Joined: May 2010 Posts: 18 | Thanks, Tiny. I guess I was trying to play it safe with the exhaust and overshot it. I'll readjust and not worry about the oil on the valve side. | | | | | Joined: Jan 2001 Posts: 5,337 'Bolter | | 'Bolter Joined: Jan 2001 Posts: 5,337 | Tiny is correct, very little oil gets to the valves.
1929-31 chevs only oiled the push rods, none to the valves.
See the USA in your vintage Chevrolet! My Blog | | | | | Joined: May 2010 Posts: 18 New Guy | | New Guy Joined: May 2010 Posts: 18 | I reset the valves to .013 on the exhaust and .006 on the intake. It made a huge difference, but I can't seem to get the idle set. The manual calls for 550 rpm, but when I get near 650 and below, the engine acts like it wants to cut off (and most of the time does). I was hoping the valve job would take care of it. The idle mixture screw is about 1.5 turns out and the throttle screw is about three turns out. Should I advance the distributor? It's timed to the steel ball on the flywheel. Also, just out of curiosity, is idling at 650 rpm a bad thing (besides fuel economy)? It's a '51 235 fresh rebuild... | | | | | Joined: Oct 2006 Posts: 9,671 'Bolter | | 'Bolter Joined: Oct 2006 Posts: 9,671 | The engine was designed to give it's best performance with the timeing set to the ball, unless you have modified the engine or know more than the engineers the designed the chevy inline six.
Adjust your idle mixture in and out till you hit the "sweet spot", the setting listed in the service and repair manuals is only a starting point.
That engine with a fresh valve job and tume-up should idle down to 450-550 rpm and be as smooth as silk.
DG
Denny G
Sandwich, IL
| | | | | Joined: May 2010 Posts: 18 New Guy | | New Guy Joined: May 2010 Posts: 18 | Thanks, Denny. I'll mess around with it today and see if I can't find that sweet spot. Should I try any adjustments on the throttle screw or play with them both or get the rpms down close with one screw and the take over and do the fine tuning with the other? As far as engine mods go, it has and HEI in it and the cylinders were bored 30 over (I don't know if that counts as a modification though). | | |
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