When does the intake valve hit the piston?
Piston to valve clearance is closest on the initial opening of the intake valve when the piston is traveling down. Valve float is not likely to occur at this point. Now the exhaust valve is total different, the tightest piston to valve cleareance occurs when the piston is nearing top dead center as the exhaust valve is closing.
How does the 1.6 rocker affect the valve timing?
The 1.6 rocker will just barely effect the valve seat timing but it changes the velocity at which the valve is lifted and mimics a change of the lobe profile. So it will change the position of the valve travel in relation to the piston. Ya know what I mean?
What kind of lift does an intake valve take?
He just bought a set of Patriot heads that say they will take a .580 lift, the cam he installed was a SUM-1107 intake has a .488 lift and exaust has a .510 lift with 1.5 rockers. Int opens 8* BTDC Closes 46*ABDC. Ex. opens 61* BBDC closes 3* ATDC Duration Int. 234 Ex. 244 @ .050.
What can cause a valve to a break and hit the piston?
It’s usually the piston that hits the valve and breaks it. The timing belt is attached to the camshaft and crankshaft sprockets. It keeps them turning “in time” so that when the pistons are at the top of their strokes, the valves are closed (or nearly so). When a timing belt is loose or worn, it can slip.
What kind of valve clearance does a jeep 2.5L have?
The subject of valve clearance on AMC/Jeep 2.5L fours and 232/258 and 4.0L inline six-cylinder engines is topical at the magazine’s forums —and across the internet! In this vlog, Moses Ludel talks in depth about checking and setting valve clearance on 1964-2006 AMC and Jeep inline sixes.
What is the check valve on a jeep lifter?
When the pushrods fill with oil (do not fill the lifters with oil, let them fill with the engine running), the oil and lifter check valves will hold the lifter plungers at this height in the lifter with the engine running. The check valve keeps the lifter from bleeding down on the loaded upstroke of the lifter.
How tall is the valve stem on a jeep?
For non-adjustable rocker arm engines, Jeep does not provide a preload specification or pushrod length measurement anywhere in its service literature. When valves and seats are ground, the valve stem height is crucial. (Milling or surfacing the head will also alter the valve stem height.