I am having problems with the oil pressure on my 2.0L XE. I have new SBD inner ring and outer ring and relief valve kit. I have 5 bar pressure at idle, cold oil and 3,1 - 3,5 bar maximum at 4000 rpm and above.
The oil pressures we recommend are for hot oil with an oil temperature between 80 - 120 deg C. This is using a 10W60 oil, fully synthetic. Possible causes for reduction in oil pressure:
1. When fitting new gears, you must be sure a genuine GM oil pump housing is used and that it is either new or in perfect condition. If the housing is worn, then a reduction in oil pressure will occur.
2. The bore where the oil pressure relief valve runs must be checked to ensure that it is smooth and has no particles or distortion. Check that the relief valve runs freely within it. if not again the oil pump housing should be replaced as this shows signs of the condition of the rest of the pump body.
3. You must ensure that the journals and bearings on rods and crankshaft are in good condition and within tolerance. Also that the whole engine is in a good working condition.
4. If you are using a thinner oil, the oil pressure will drop lower as the oil temperature rises. The oil pressure can be varied on the engine by adding addition washers to trim the oil pressure.
5. All of the above points should be checked before attempting re-shimming as you may be disguising engine wear by carrying out this modification.
Will the 2L 16V wet sump XE\LN also fit on a Z20LEH engine. I’m building a Lotus Seven kitcar and will use a z20LEH and would love to have some more ground clearance.
Although we do not specialise in the z20LEH engine, this engine normally has, as far as I am aware, an extra ladder frame fixed to the underside of the block. We have removed this from earlier models of engine using the same type with no issues. This frame is normally added in order to help reduce vibration on the standard road engine near tickover due to emissions. We have always run the 2.0L XE block at very high rpm, sometimes over 9000rpm with no issues. You may be able to then get the XE sump to fit, but you will have several problems when doing so; the oil pump on the z20LEH has an oval pick up pipe, the bolt holes in the sump are 6mm diameter where on the later engine they are 8mm diameter, but the biggest problem even if you overcome all the other issues is that a wet sump engine is not ideally suited for use in a Seven type kitcar. These type of cars are able to pull quite high G forces, particularly with modern tyre technology and the wet sump would not be suitable in its standard form.
Provided your car is only for road use and driven conservatively, then the wet sump we produce for this type of car has an amount of oil control (you will be still required modifications as mentioned above). If the car is to be used for any kind of track use, we would only recommend dry sump.
I have a SSC Stylus with 2.0L VX XE with a dry sump p/p on exhaust side. Have machined front 'V' from standard pulley cluster, to fit toothed p/p drive pulley. Standard alternator belt is now blocking oil inlet port on front of engine. Assume a change to one of your multi-vee pulleys will cure this problem? Can the standard alternator be retained and fitted with a matching pulley? Will retention of standard alternator in anyway cause a problem with fitting of fuel injection throttle bodies?
The smaller pulley we produce with the 4 grooves will certainly give you more space. We also offer a small 4 groove pulley which will replace your single pulley on your alternator. It will then be a simple process of going to your local motor factor, since the 4 groove belts are now readily available and choosing the best that most suits your installation.