auyt Posted July 5, 2018 Share Posted July 5, 2018 A friend is collecting a 88SS next week and I was wondering what is the correct Octane rating, The car is an ex Japanese factory built car with 1.7 litre 10.5:1 comp. I figure at that comp level 98 is the correct rating only other option is 95 Link to comment Share on other sites More sharing options...
Jonathan Kay Posted July 5, 2018 Share Posted July 5, 2018 I can't see anything in the contemporaneous Assembly Guide.Let me know if your friend would like a copy.Jonathan Link to comment Share on other sites More sharing options...
Gloucestershire AR Posted July 5, 2018 Share Posted July 5, 2018 I run 98 in mine auyt. He could try 95 but any suggestion of pinking (make sure he knows how to recognise the knocking noises!) and switch to 98 and don't labour the engine or rev it hard. I think too the engine will run cooler on 98? But a proper engineer can confirm if that's the case. Some fuels - eg BP - are 97. My opreference is Shell and the engine was mapped on that.Worth carrying round a bottle of octane booster too as 98 isn't always easy to find everywhere, even in the UK.Andy Link to comment Share on other sites More sharing options...
Area Representative Golf Juliet Tango Posted July 5, 2018 Area Representative Share Posted July 5, 2018 I run my 1996 SuperSprint on 98 (or 97 and had a tankful of Tesco 99 (bizarre) fuel the other day). Link to comment Share on other sites More sharing options...
Stridey Posted July 5, 2018 Share Posted July 5, 2018 My Crossflow prefers BP 97. Though 95 is fine if that’s all I can get. Link to comment Share on other sites More sharing options...
Ian Macquarie Posted July 5, 2018 Share Posted July 5, 2018 Does it have hardened valve seats? If not I'd consider a lead replacement additive. Link to comment Share on other sites More sharing options...
elie boone Posted July 5, 2018 Share Posted July 5, 2018 From memory all " Japanese " cars where to run on lead free but that involved only the ign timing, the valve seats where not hardened. Link to comment Share on other sites More sharing options...
auyt Posted July 5, 2018 Author Share Posted July 5, 2018 Thanks Guys luckily 98 is readily available from major Fuel companies. and Elie thanks for the insight about the valve seats, something to keep in mind. I will grab some valve saver. Link to comment Share on other sites More sharing options...
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