EURON8 Posted January 11, 2009 Share Posted January 11, 2009 No help needed but i found this info while browsing the other day. Though it may be useful to someone. http://ourworld.compuserve.com/homepage ... eng18r.htm ( Website says content may be moving so have copy 'n' Pasted it here) 1968cc 18R engine. Most data copied from Toyota's "18R Engine Repair Manual", 1983. The 18R engine is an overhead cam, overhead valve engine with 4 inline cylinders. The block is cast iron and the cylnder head is usually cast iron. Twincam versions (18R-G, 18R-GU, 18R-GEU) use twin overhead cams in an alloy head. All twincam versions of the 18R can use unleaded fuel because all alloy heads have hardened valve seats. The single cam versions without hardened valve seats (18R, 18R- should use leaded fuel. The single cam versions with hardened valve seats (18R-U, 18R-C) can use unleaded fuel. Gaskets can be shared between all versions (twincam can use gasket goop around timing cover). Inlet and exhaust manifolds are different for single and twin cam versions. Many parts are interchangeable with other R series engines. The twincam head is not compatible with the 20R or 22R block. Most cars with any R series engine can accept the 18R. All cars with any 18R can accept the twincam versions. The twincam has a unique exhaust. All other 18R variants can share heads and exhausts. Most versions use the same data except for timing. The 18R-G, 18R-GR and 18R-GU use twin Mikuni Solex sidedraft PPH40's with the same bolt pattern as Weber DCOE's. The 18R-GEU EFI system can be bolted to the other 18R twincam heads. The 18R-GEU can be converted to carbs by using the manifold and carbs from the other 18R twincams. Early 18R twincam heads had small valves with large cams. Over time the valves grew larger and the cams grew milder. All 18R twincam heads can be interchanged. All 18R twincam cams can be interchanged. The twincam and single cam blocks are identical except for the oil dipstick hole. Both blocks have bosses for the dip stick on both sides. Single cam has a hole drilled in the boss on the exhaust side for the dip stick. Twincam has a hole drilled in the boss on the dizzy side for the dip stick. The twincam and single cam cranks are identical. The twincam can use the single cam oil filter mount after it has been shortened to except a Z386 oil filter. The twin carb 18R-B is identical to the single carb model (18R, 18R-C) except for the manifold and the twin carbs. The 18R-B carbs are identical to the 18R and 18R-C carbs except for the jetting. The twincam and single cam distributors have different bodies but the internals can be interchanged. You can upgrade to electronic ignition by using the distributor internals from any R or T series engine with EI (eg 18R-GU, 18R-GEU, 18R-EU, 2T-GEU, 3T-EU, 13T-EU). You also need the corresponding ignitor module. Note: early model EI has an external ignitor bolted to the coil and later model EI has the ignitor inside the distributor. Both types can be used on any R or T series engine. The 8R is almost identical to the 18R except for the bore and stroke. The 10-R is identical to the 8R-G. An 8R head on an 18R block raises the compression for more power. It has been reported that 12R oil pan fits the 18R, making it easier to replace a 12R with an 18R. Maybe somebody can try a 12R head on an 18R block. The 12R directly replaced the almost identical 4R and 9R. The 9R was a 4R with a twincam head. It is not known how much the 9R twincam shares with the 18R-G twincam. I suspect the 16R is also the same as the 18R apart from bore and stroke. The 16R shares the same head gasket as the 18R-C, so a 16R head can probably be used on an 18R block to raise compression. It may also be possible to put an 18R-G twincam head onto an 1800cc 16R block. Engine Difference from 18R 18R-C uses PCV and charcoal cannister for low emmisions 18R-E EFI 18R-U uses TTC-C for low emmisions 18R-G twin overhead camshafts, twin sidedraft carbs, 9.7 CR 18R-GR twin overhead camshafts, twin sidedraft carbs, low compression for regular fuel 18R-GU twin overhead camshafts, twin sidedraft carbs and TTC-C 18R-GEU twin overhead camshafts, EFI and TTC-C 8R, 10R Different bore and stroke but head is interchangeable with 18R Common settings Bore x Stroke 88.5x80mm Displacement 1968cc Inlet valve clearance - hot 0.20mm (0.008") Exhaust valve clearance - hot 0.36mm (0.014") Timing 18R 10° BTDC at 600rpm Timing 18R-C auto 5° BTDC at 650rpm Timing 18R-C manual 5° BTDC at 750rpm Timing 18R-E 10° BTDC at 850rpm Timing 18R-G® auto 5° BTDC at 1000rpm Timing 16R manual 7° BTDC at 700rpm Timing 16R auto 7° BTDC at 750rpm Timing 16R-B 10° BTDC at 800rpm Firing order 1-3-4-2 Idle speed 750 ± 50 rpm Fast idle speed 2600 ± 200 rpm Manifold vacuum at idle 420mm Hg (16.5" Hg) Compression - standard 11.5kg/cm² (163.1psi) Compression - minimum 9.0kg/cm² (127.8psi) Compression - max difference between cylinders 1.0kg/cm² (14.2psi) Spark plug 18R Denso W20EP, NGK BP6ES Spark plug 18R-G® Denso W20EX, NGK BP6EZ Spark plug gap 18R 0.7mm-0.8mm (-0.03") Spark plug gap 18R-G® 0.9mm-1.0mm Max spark plug lead resistance 25kOhm Distributor heel gap 0.45mm Distributor damping spring gap 0.1-0.4mm (0.004"-0.168") Dwell angle 50°-54° Dwell variation 3° Ignition timing 7° BTDC/750±50rpm Torque settings - 18R-G Cylinder head 7.2-8.8kgm (52.1-63.7ftlb) Camshaft bearing cap 1.6-2.2kgm (12-15ftlb) Camshaft timing gear 7.0-8.0kgm (50.6-57.9ftlb) Camshaft drive gear 6.0-7.0kgm (43.4-50.6ftlb) Intake manifold 1.0-1.6kgm (7.2-11.6ftlb) Exhaust manifold 3.5-4.5kgm (25.3-32.6ftlb) Crankshaft bearing cap 10.0-11.0kgm (72.3-79.6ftlb) Connecting rod cap 6.4-7.0kgm (46.3-50.6ftlb) Oil pan 1.0-1.6kgm (8-12ftlb) Crankshaft pulley 8.2-8.8kgm (59.3-63.7ftlb) Quote Link to comment Share on other sites More sharing options...
Jase Posted January 12, 2009 Share Posted January 12, 2009 sounds good does this mean the vans going twin carb twin cam or efi stz Quote Link to comment Share on other sites More sharing options...
BlownCorona Posted May 3, 2010 Share Posted May 3, 2010 would anyone know what type of carb the 18r uses, and what kind of carb(s) would i need to move to in order to run a decent cam upgrade. and anything else that would be required, (im new to old school cars) any help would be great, Thanks Quote Link to comment Share on other sites More sharing options...
smokin' joe Posted May 3, 2010 Share Posted May 3, 2010 would anyone know what type of carb the 18r uses, and what kind of carb(s) would i need to move to in order to run a decent cam upgrade. and anything else that would be required, (im new to old school cars) any help would be great,Thanks 32/36 weber would be a start, or a 40/40 off a 3l capri v6 Quote Link to comment Share on other sites More sharing options...
mutiny Posted May 3, 2010 Share Posted May 3, 2010 yeah i used a 32/36 on my 21r, made a huge difference, you can buy adapter kits from use philspeed on trade me, i however welded up the factory manifold then re threaded, manifold was made of puss though and wouldn't bother doing it again Quote Link to comment Share on other sites More sharing options...
rob Posted May 3, 2010 Share Posted May 3, 2010 it uses some twinbarrel aisin clunker with auto choke, i have a few lying around and also the 18r engine manual if you wanted more info/pics etc.. dont waste your money fucking about with a lumpy cam in a single-cam 18r, just get a DOHC 18r-g - they don't go for all that much and will bolt right in place of the single-cam engine, using the same gearbox and everything Quote Link to comment Share on other sites More sharing options...
BlownCorona Posted June 30, 2010 Share Posted June 30, 2010 yea, im in about 3 minds with what to do with the engine. either a twin carb with some kinda cam upgrade, an 18r-g if i can find one, or what im leaning to and would really like, a 22rte. although its going to be next to impossible to find and i don't know what they are worth. i hear very good things about then and that they have great torque, plus turbo would be cool. any thoughts? Quote Link to comment Share on other sites More sharing options...
rob Posted June 30, 2010 Share Posted June 30, 2010 For the price of some twin carbs and a new cam + the extras and the fuckarounds needed to make this work, you could easily get an 18R-G Not all that long ago, I picked up an 18R-GEU off tardme, complete with ECU, loom and a W50 gearbox for $600 - it ended up coming with the donor car too so I got the fuel pump and a few other bits and pieces with it as well. After selling all the bits from the donor car, the engine/ECU/gearbox/etc has cost me about $100. It's just a matter of keeping your eyes out for one.. after I'd bought mine I watched as a "rebuilt" 18R-GEU + ECU went for a mere $200 on a $1 reserve auction. If you are really desperate for a turbocharged R-motor, start with an 18R-GEU, get a turbo manifold made up for it and use a megasquirt/link for engine management. 22R-TE is just a grotty truck motor, a turbocharger does not a performance-engine make Quote Link to comment Share on other sites More sharing options...
BlownCorona Posted July 1, 2010 Share Posted July 1, 2010 ahh yea, well 18rgeu seems to be the way to go, then i keep thinking about what if i put a 4age. what kind work would be required to fit one? Quote Link to comment Share on other sites More sharing options...
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