Old, crushed copper wire removed, and new wire fitted. Another view of the Supertech oversize stainless steel nitrite treated intake and inconel exhaust valves. Intake ports lightly ground to remove casting parts and bowl blend seats to ports. Intake and exhaust guides were replaced with PRE custom guides. We shortened the guide protrusion from the valve spring side to accomodate high lift Kelford camshafts.
Both intake and exhaust guides were shortened with a ball radius tool for flow optimization. Cylinder head was converted to use VQ35DE solid cam followers. VQ35DE cam followers are one-piece design and you have to replace each one to adjust camshaft to valve clearance. This can be rather expensive so we mock assemble the cylinder head, measure valve clearance, disassemble, grind valve tips to increase clearance, and then final assemble the head.
Both lifters same diameter, but VQ35DE lifters have a pedestal stem underneath. This pedestal has to be machined shorter to fit KA24DE head. We made a small soft-jaw fixture to machine lifters in the mill. VQ35DE solid lifter advantage is shorter length allowing high lift camshafts and dramatic reduction in weight. This directly translates to reduced total mass of the valvetrain and inertial loads.
Lighter lifters allow use of softer springs that can be used over RPM limit without valve float risks. Another cylinder head modification had to be performed. Kelford high lift camshafts have such big lobes they did not clear cylinder head casting and would not rotate.
Cylinder head was mounted in the mill and casting relieved with a ball endmill. This operation performed on both intake and exhaust side. Final step of cylinder head blueprinting is measure valve spring install heights, measure spring pressures, and shimming springs to equalize them. This is essential to consistent valvetrain performance on all 4 cylinders.
These bolts are made of higher tensile strength steel and torque to a higher value than stock bolts. Stock bolts torque to 8ft-lb, while PRE bolts torque to 12ft-lb. This engine has upgraded valvetrain components for durability but the valve sizes are stock. How do the new cam buckets affect in a NA application. Would the cost of this be beneficial in a racing application.
You would still set the last to cam manufacturers specs? I am interested in this is why I want to learn more about it. The KA24 uses a Hitachi sequential electronic fuel injection system.
Nissan configured some KA24 engines for front wheel drive vehicles. It makes sense just to adapt the engine for multiple platforms rather than creating an all-new engine. Just like any other engine, the KA24DE has a couple of known issues that are common. The distributor is known for failing on earlier versions of the KA Another prevalent issue is a rattling timing chain, which occurs when the timing chain gets loose from age and begins to rub against the timing chain cover.
Supposedly the alternator fails more than many other vehicles, but we are not able to verify this problem. The last issue is the valve cover gasket which is known for leaking, which is mostly due to the bolt pattern and design of the valve cover. Thanks to the massive explosion of drifting, the SX has become the most popular tuner car in the world. It is enough to drive in the city.
Using big turbocharger you can gain about horsepower on stock pistons. Mitsubishi 4G63T. Mitsubishi 4G Honda K20A K20C. Honda K24A K24Z. BMW N Toyota 2JZ. Honda F22C. Toyota 3S. BMW S Honda L15A L15B. Toyota 2NZ. Search for:. We balance the rotating assembly and then proceed to put together the bottom end. We do not use plasti-gauge!! Each component is clearanced using micrometers for more accurate measurements.
We will not use Clevite bearings in our build since we have found that they do not have adequate thrust clearances and the rod bearing clearances are usually too loose for our preferences. Each rod is reconditioned and re-fitted with ARP rod bolts.
The rods are balanced individually to the lightest rod and the same process is used for the pistons before finally spin balancing the crank. We utilize a complete Fel-Pro gasket in our assembly process and install new freeze plugs during the assembly process.
Any of the extra gaskets are re-boxed and sent with the engine.
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