LC Engineering 522R-RE

 

How to identify your Cylinder Head:

You can also view a PDF version HERE

 

Cylinder Head Identification


1975 1980 20R Cylinder Head
Round Intake Port / Round Exhaust Port
80 / 81cc Chamber
In. Valve Dia. 43mm / Ex. Valve Dia. 35mm

1981 / 84 22R / RE Cylinder Head
Square Intake Port / Round Exhaust Port
82 /83 cc Chamber
In. Valve Dia. 44.5mm / Ex. Valve Dia. 36.5mm

1985 / 95 22R / RE Cylinder Head
Square Intake Port / Pear Shaped Exhaust Port
58 cc Chamber or 22RET (Turbo)
In. Valve Dia. 44.5mm / Ex Valve Dia. 36.5mm
 

Cylinder Head Intake Air Flow  (Approx.)

 
Stock      130 CFM
Stage 2   160 CFM 
Stage 3   200 CFM 
Stage 5   250 CFM 

 

 LC Pro Cylinder Head

 

The LC Engineering Pro Cylinder Head for the late 85-95 22R/RE engines is a combination of performance parts designed to allow the motor to breathe more efficiently.

The power portion of building a 22R/RE is concentrated in the aluminum cylinder head. The head is ported to Street Performer specs and includes new exhaust studs. The Pro Cylinder Head is new, not a rebuilt core and is available with or without a camshaft. Camshaft selection can be either our Street Performer or EFI Pro model. Both camshafts are .440 intake/.440 exhaust and have a duration of 230° @ .050.

This cylinder head is set up to run all the factory specifications i.e. rocker adjustments, distributor timing, cam specs and torque. The head comes with new street performer springs, keepers and retainers. The sizes of the new stainless steel valves are 45.5mm intake and 37.5mm exhaust. Stock 22R/RE valves are 44.5mm intake and 36.5mm exhaust. The new valves are 1mm larger than stock and still retain the stock size valve seats.

Stock combustion chambers average between 54 and 56 cc's with the new chambers averaging 59 cc's. Cylinder head deck heights start out at 3.130" and are milled approx .010 to maintain stock compression ratio.

Installation of the Pro Cylinder Head is just as easy as the stock head. The torque requirement on the head bolts is 62 ft. lbs. The valve adjustment is .008 intake and .012 exhaust (just like factory). Factory or aftermarket head gaskets are also available.

The Pro Cylinder Head (#1021024) with camshaft will net a significant horsepower increase over a stock cylinder head set up. Get all the information today.

Proper Deck Heights Blocks & Heads

 
Measuring "Center Line of the Main Journal"
 


    Whenever you go through an engine or cylinder head re-build, there will be some amount of "re-surfacing" that has to be performed to either the block or the head. Most frequently, it's the cylinder head.  This is also known as "decking."
For machining purposes, deck height on an engine block is the measured distance between the "Center Line of the Main Journal" to the "Deck Surface".  This can only be performed with the engine block disassembled and the crankshaft removed.  Toyota factory heights would be: 

Measuring "Oil Pan Rail"

 
  • Early 20R Blocks 75-80         9.120"
  • Early 22R Blocks 81-84         9.120"
  • Late 22RE Blocks 85-95        8.930"
 
    For easy identification purposes, with the engine still assembled, deck height on an engine block is the measured distance between the "Oil Pan Rail" (bottom of the engine block) to the "Deck Surface" (top of the engine block).  Toyota 20R, 22R and 22RE engine blocks have these factory deck heights:
  • Early 20R Blocks 75-80           11.280"
  • Early 22R Blocks 81-84           11.280"
  • Late 22RE Blocks 85-95          11.090"
 
   
    Deck height on a cylinder head is the distance between the bottom of the "Camshaft Journal" to the "Surface of the Cylinder Head" itself.  Toyota 20R, 22R and 22RE cylinder heads have these factory deck heights:
 
   
 
  • Early 20r/22R Heads 75-84                3.290"
  • Late 22R/22RE Heads 85-95             3.130"
 
 
   
    These numbers are especially important if you have purchased a pre-owned engine and have no idea what, if any, modifications were made prior.  In other words, it's a starting point in establishing how much re-surfacing has already been performed to the head or block.  Example: If you have a late 22RE cylinder head that has a measured deck height of 3.110", then it is probably safe to say that the head has been "decked" approximately 0.020".

From stock deck height measurements, LC Engineering recommends for "street use", no more than 0.020" of re-surfacing or use a head shim to achieve proper deck height.  Anytime you deck a head, block or both, by more than 0.010" you are affecting the camshaft timing with the engine resulting in a "Lazy" motor.  If increased compression is the goal, or the surface requires "decking" because of minor warping, then an adjustable camshaft gear will be ideal.

If you wish to deviate from any of the factory specifications, "decking", larger camshafts, bigger valves, domed pistons, etc...please call the experts at LC Engineering to get the right answers to your questions before it costs you more.  With over 20 years of proven experience, we can assist in completing the right engine components for your needs.

Rocker Arm Tips

 
      LC Engineering strongly recommends replacing the rocker arms on your Toyota engine when a new camshaft is installed. The main reason is the rocker arm will usually wear or "burnish" before the camshaft lobe will. When replacing a camshaft and not replacing the rocker arms, the new camshaft will contact the used rocker arms in a different spot and create an un-even surface for the camshaft lobe. In most cases the two burnish marks will overlap and cause scoring and eventually camshaft failure. It is possible to resurface the rocker wear pads but not recommended. Often times the "burnish" mark is too uneven or deep and cannot be saved. If the "burnish" mark is all the way across the wear pad, the rocker arms need replacement. There are some sample photos below that will show some examples of normal wear and abnormal wear. Please contact our Technical Department for further  information.
Brand new rocker arm wear pad & new camshaft lobe.
 
 
   
     
 
How a normal wear pattern looks on a camshaft lobe.   How an abnormal wear pattern looks on a camshaft lobe.
     
 
How an abnormal wear pattern looks on a rocker arm wear pad.   How an extremely worn rocker arm wear pad looks.

 

Five Signs of a Blown Head Gasket

Exhaust

Your exhaust will present one of the common signs of a blown head gasket. When you have a gasket leak, you will notice white smoke coming out of your tailpipe. The exhaust will also have a sweet smell to it.

Bubbles

Bubbles are also one of the signs of a blown head gasket. A gasket leak will cause bubbles of air to come into your radiator. To check for this, you should first remove the radiator cap then warm up the engine. When you rev the engine, you will see bubbles come out from the top of the radiator.

Oil

One of the next signs of a blown head gasket is contaminated oil. You will notice a milky ring surrounding your oil cap. This is caused by coolant entering the engine oil through the leaking gasket. This mixture leaves the milky ring around the oil cap when it evaporates. You can check for this by taking the car for a short drive, then checking the oil for contamination.

Engine

Lack of engine power is also one of the signs of a blown head gasket. The engine will lack power because of compression loss. The engine will also run poorly and will idle roughly. You should also be careful because the engine will overheat quickly when you have a blown head gasket.

Spark Plugs

Your spark plugs will present one of the last signs of a blown head gasket. If you have green coolant in your system, the spark plugs will have a green tint around them. If the problem is very severe, the coolant may start squirting out of the plug holes.

These are the most common signs of a blown head gasket. One of the most noticeable is white smoke coming out of your tailpipe. You will also notice that your oil has been contaminated with coolant that will form a milky ring around your oil cap. If you see any of these signs of a blown head gasket, you should stop driving your car as much and get it fixed. If you don't, the engine will overheat and may cause an expensive repair bill.

You can also buy a Lisle 75500 Combustion Leak Detector at your local part store or in Amazon.com Here

 

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