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Rover V8 Short Engines |
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Important Notes - Short Engines
COMPRESSION RATIOS - CYLINDER HEADS & SHORT ENGINES ©Rimmer Bros Ltd - Registered in England No. 2155394. VAT No. GB 352 8473 40.
Short Engines
Important Notes - Short Engines
Short engines are sold on an exchange basis (except certain new short engines).
The old unit must be a suitable type (1980 onwards) otherwise a surcharge will apply.
3.5 Litre - new short engine;
Comprises new block/crank/bearings/pistons/rods (assembled).Less cam & followers.
Low Compression (8.13:1) - (1) - ETC7714
High Compression (9.35:1) - (1) - RB7121
3.5 Litre - recon short engine (exchange);
Comprises recon block, rebored with new pistons/cam bearings/reground crank & new bearings (assembled).
Less cam & followers.
Low Compression (8.13:1) - (1) - ETC7714R
High Compression (9.35:1) - (1) - RB7121R
3.9 Litre - new short engine - (1) - RB7487
Comprises new block/crank/bearings/pistons/rods (assembled). Less cam & followers.
3.9 Litre - recon short engine - (1) - RB7487R
Comprises recon block, relinered with new pistons/rings/cam bearings/reground crank & new bearings (assembled).
Less cam & followers.
3.9 Litre - uprated short engine - (1) - RB7487UR
Comprises new, large journal block, cross-bolted & ARP mains studs. Crank/rods & pocketed pistons. Lightened & balanced assembly.
Less cam & followers.
4.2 Litre - short engine - (1) - ERR4171
Comprises block/crank/bearings/pistons/rods (assembled). Less cam & followers.
4.0 Litre - new short engine;
Series 2 Range Rover application.
NB. Unsuitable for use with pre '95 heads as low compression ratio results.
Large journal, cross-bolted type.
Comprises new block/crank/bearings/pistons/rods (assembled). Less cam & followers.
Low Compression * (8.13:1) - (1) - STC1890
High Compression * (9.35:1) - (1) - STC1891
* Please see note regarding Compression Ratios below.
4.6 Litre - new short engine;
Series 2 Range Rover application.
NB. Unsuitable for use with pre '95 heads as low compression ratio results.
Large journal, cross-bolted type.
Comprises new block/crank/bearings/pistons/rods (assembled). Less cam & followers.
When using this short engine to replace earlier type (3.5 or 3.9) engines, a crank spacer - part no. STC1893SPACER - may be required.
Please enquire for details.
Sump pan may also require relieving to allow swing clearance for front web of crank.
Low Compression * (8.13:1) - (1) - STC1892
High Compression * (9.35:1) - (1) - STC1893
* Please see note regarding Compression Ratios below.
4.6 Litre - new short engine;
Pre-Series 2 Range Rover applications.
Suitable for use with pre-Series 2 Range Rover cylinder heads (see notes regarding compression ratios below).
Large journal, cross-bolted type.
Comprises new block/crank/bearings/pistons/rods (assembled). Less cam & followers.
When using this short engine to replace earlier type (3.5 or 3.9) engines, a crank spacer - part no. STC1893SPACER - may be required.
Please enquire for details.
Sump pan may also require relieving to allow swing clearance for front web of crank.
High Compression * - (1) - STC1893HC
* Please see note regarding Compression Ratios below.
4.8 Litre - new short engine - (1) - RB7676
Comprises large journal, cross-bolted block & long stroke (86mm) crank. ARP mains studs, new pistons & rings. Less cam & followers.
When using this short engine to replace earlier type (3.5 or 3.9) engines, a crank spacer - part no. STC1893SPACER - may be required.
Please enquire for details.
Sump pan may also require relieving to allow swing clearance for front web of crank.
5.2 Litre - new short engine - (1) - RB7682
Comprises large journal, cross-bolted block, fitted with special 96mm bore lines long stroke (90mm) cross-drilled crank,
steel rods & new pistons (90mm stroke).
Lightened & balanced assembly. Less cam & followers.
When using this short engine to replace earlier type (3.5 or 3.9) engines, a crank spacer - part no. STC1893SPACER - may be required.
Please enquire for details.
Sump pan may also require relieving to allow swing clearance for front web of crank.
SHORT ENGINE BUILD-UP
When building up a short engine to a complete assembly, it is essential to thoroughly examine every part you intend to reuse. We recommend that you pay special attention to the camshaft, followers, pushrods & rocker gear, checking carefully for signs of wear; reusing worn parts is false economy and you risk contaminating your new engine with abrasive particles.
The following parts MUST be meticulously cleaned prior to fitting:
Sump & oil pick-up pipe
Timing cover & oil pump assembly
Cylinder heads
Rocker covers
Failure to observe these points may lead to engine damage and may invalidate the engine's warranty.
Short Engines - Ancillary Components.
If you are re-fitting ancillary components - water pump, alternator, distributor, carburettors or fuel injection - check that they are suitable for re-using. We recommend having carburettors serviced and fuel injectors cleaned/replaced before re-fitting.
The cooling system - including the radiator and heater - should be flushed through with clean water and the hoses checked before re-using.
The correct ratio (minimum 33%) of antifreeze must be maintained at all times. Oil coolers should be flushed of old engine oil.
Engine & gearbox mountings should be checked and renewed as necessary.
The clutch operating system should be checked for wear.
All engines - oil pump priming.
All engines not fitted with crank-driven oil pumps should have their oil pumps primed before initial start-up. Please consult a workshop manual for this procedure.
TIMING COVERS
If the timing cover you intend to fit to your short engine incorporates a crank-driven oil pump, please inform the Sales Department at the time of ordering (3.5 & 3.9 litre Standard Short Engines only).
Uprated 3.9 litre Short engines, as well as all Short Engines of 4.0 litres and above, are suitable for timing covers which incorporate crank-driven oil pumps. If fitting the earlier type of timing cover - with camshaft-driven oil pump - to a short engine of 4.0 litres or above, please also request crank spacer, part no. STC1893SPACER, which will ensure the crankshaft pulley is securely fitted. If in any doubt, a member of our Sales Department will be pleased to help you.
There are various different Rover V8 cylinder heads available, with different combustion giving a variety of compression ratios when fitted to a short engine. Therefore, you will need combustion chamber size of the cylinder heads that you intend to use in order to be able to calculate the engine's compression ratio.
As a general rule, cylinder heads up to the introduction of Series 2 Range Rover (1994) have approximately 34-36cc combustion chambers. From the introduction of Series 2 Range Rover (4.0 & 4.6 litre engines), they have approximately 28cc combustion chambers (If in doubt, cylinder heads fitted to 4.0 & 4.6 litre engines have only two rows of cylinder head bolts; earlier engines have three rows).
Refer to the table below of Short Engine & Cylinder Head Applications for more detailed information.
This information does not take into account any machining work done on the cylinder heads in the past.
In certain circumstances, it may be cheaper to purchase a pair of reconditioned cylinder heads than to try to match a pair of unknown heads to a Short Engine.
Alternatively, it may be worth considering a Full Engine, which is supplied complete with fitted cylinder heads.
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