Spark plugs S Series 2.8 1988
Discussion
Either is fine. This is not a particularly sophisticated engine. The original Ford spec is Motorcraft 5099775. Any decent motor factor will be able to cross reference from that.
Just a point. If it is a 2.8 it will NOT be unleaded compatible*, unless someone has spent a lot of money on it. Nor can the 2.8 heads be readily converted to unleaded. The thickness of the casting around the valves is marginal and although some will take inserts, in a minority of cases one or more of the insert recesses will cut through the casting and scrap the head. Burton will supply inserted and gas pressure checked heads but you will be warned that your original heads might fail during the machining. It will not be recommended.
If you do not there will be micro-welding between valve and head and the valve seat will gradually be eroded. If you find your valve clearances are CLOSING then recession is happening. As it recesses, you adjust the clearance to compensate, the recession rate increases and the valve head starts to drop below the surface of the head. That then effectively reduces the valve opening time and starts to dramatically reduce the ability of the engine to 'breath', and the 2.8 has restricted breathing anyway as it has siamezed ports. Incidentally that siamezed porting also increases the heat at those ports and they are the most likely to be the first to recess.
Just a point. If it is a 2.8 it will NOT be unleaded compatible*, unless someone has spent a lot of money on it. Nor can the 2.8 heads be readily converted to unleaded. The thickness of the casting around the valves is marginal and although some will take inserts, in a minority of cases one or more of the insert recesses will cut through the casting and scrap the head. Burton will supply inserted and gas pressure checked heads but you will be warned that your original heads might fail during the machining. It will not be recommended.
- You may be told that some are unleaded or to look for a letter on the exhaust stub. Forget it. The experts in engine rebuilding (Burton for example) say that only a very few special 2.8 engine heads were made as unleaded compatible and these did not go into production cars, as Ford were redesigning the whole engine to produce the 2.9.
If you do not there will be micro-welding between valve and head and the valve seat will gradually be eroded. If you find your valve clearances are CLOSING then recession is happening. As it recesses, you adjust the clearance to compensate, the recession rate increases and the valve head starts to drop below the surface of the head. That then effectively reduces the valve opening time and starts to dramatically reduce the ability of the engine to 'breath', and the 2.8 has restricted breathing anyway as it has siamezed ports. Incidentally that siamezed porting also increases the heat at those ports and they are the most likely to be the first to recess.
https://www.sparkplugs.com/Data/uploads/Charts/NGK...
I used the BP6ES in my 2.8 which work well. I believe the S denotes a different style electrode.
I didn’t use the resistive plugs as I didn’t see the need.
I used the BP6ES in my 2.8 which work well. I believe the S denotes a different style electrode.
I didn’t use the resistive plugs as I didn’t see the need.
My notes say Motorcraft 5099775 for the V6.
See https://www.sparkplugs.co.uk/spark-plug-symbol-cod... for an explanation of the NGK codes.
See https://www.sparkplugs.co.uk/spark-plug-symbol-cod... for an explanation of the NGK codes.
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