srfcrugby Posted February 25, 2009 Share Posted February 25, 2009 i have a black deveil pap. Can anyone tell me what fuel it takes i know its the 2% mix with castrol tts but do you just mix it with normal unleaded petrol. I know this will be simple to those who know thanks for your reply Quote Link to comment Share on other sites More sharing options...
pete_b Posted February 25, 2009 Share Posted February 25, 2009 i have a black deveil pap. Can anyone tell me what fuel it takes i know its the 2% mix with castrol tts but do you just mix it with normal unleaded petrol. I know this will be simple to those who know thanks for your reply YES Pete b Quote Link to comment Share on other sites More sharing options...
carvingair Posted February 26, 2009 Share Posted February 26, 2009 What compression ratio is the BD? Does a high comp ratio justify the use of a higher octane fuel? I remember reading an article by an X-oil distributor who said low compression ratio motors use regular gas best and a high ratio can use - yep, a higher octane gas (which actually retards the spark?). I use regular in me Solo 210 and high test in the Parajet - 2% TTS works well for this lad, I just multiply 10 liters by 2% and add 200ml to the applicable compression ratio of the day. Cheers, Marko D. Quote Link to comment Share on other sites More sharing options...
paramotormike Posted February 26, 2009 Share Posted February 26, 2009 Hi Marko, I was told by the Manufactuer of my ParaMotor, which has a JPX Italia Corsair M25Y Black Devil 172.5cc 2-stroke (wow thats a mouthful) to use Super Unleaded, as it gives a bit more power at the high end. I have been running it that way since new. This is also now confirmed by the UK importer (ConAir Sports Ltd) and is also in the manual. Cheers Mikey Quote Link to comment Share on other sites More sharing options...
carvingair Posted February 26, 2009 Share Posted February 26, 2009 Yes Mike, the muscle cars of the 60's and 70's had high compression ratios like upwards of 10:1 and 11:1 and these too worked better with higher octane fuel. But to use high-test in motors with 8:1 is redundant and possibly counter-productive. Having said that, your motor is of the higher ratio if I remember correctly (she's all going fuzzy with age). The motor manufacturer, like you say, will yield the very bestest advice on octane grade and oil mix - at least that's who I go with. Power Up Quote Link to comment Share on other sites More sharing options...
paramotormike Posted February 26, 2009 Share Posted February 26, 2009 Just looked in the Manual and the compression ratio is 11:1 Mikey Quote Link to comment Share on other sites More sharing options...
srfcrugby Posted February 27, 2009 Author Share Posted February 27, 2009 thanks for help and disscussion so far. the manual for my cors air M 25 Y black devil describes the fuel in a number of ways as: premium petrol 98 octane 97 octane gasoline 4 star (super) fuel my question is this; is this just American for normal unleaded petrol their are two choices at my petrol station unleaded and super unleaded which should i choose? Also, if either is ok, is there an advantage for using the more expensive super unleaded and what would that be? thanks for help Andy Quote Link to comment Share on other sites More sharing options...
Phil_P Posted February 27, 2009 Share Posted February 27, 2009 Well the USA and the UK use different ways of measuring octane (RON and MON I think). Here in the UK, I think that 97 octane (RON) is super unleaded. Quote Link to comment Share on other sites More sharing options...
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