Steviekid Posted June 11, 2009 Share Posted June 11, 2009 We were away looking at RX8's yesterday (my girlfriend wants one) and I'm slightly confused about why some are listed as 1300cc and some at 2600cc on dealers websites and when getting insurance quotes. I thought they were all 1300 twin rotor and the only reason the 231 makes more power is because the rev limit is 2k higher? Someone I vaguely know claims however that the 192 only has one rotor, I take it that's a load of garbage as parkers lists all the models as 1300 and surely if it only had one rotor there would be a lot more than 40ps difference? Where does this 2600cc engine size come from? Quote Link to comment Share on other sites More sharing options...
heckler Posted June 11, 2009 Share Posted June 11, 2009 i belive the 2.6 is just an "equivelient" size, but the capacity is 650cc (approx) per rotor. Both the 192 and 231 are twin rotor. Quote Link to comment Share on other sites More sharing options...
Steviekid Posted June 11, 2009 Author Share Posted June 11, 2009 i belive the 2.6 is just an "equivelient" size, but the capacity is 650cc (approx) per rotor. Both the 192 and 231 are twin rotor. Cheers, that's what I though. I can understand dealers listing it as 2600 then but it seems a bit strange you can pick either size when getting insurance quotes from the same company. I wonder if it alters the price! Quote Link to comment Share on other sites More sharing options...
Todd Posted June 11, 2009 Share Posted June 11, 2009 I wonder if it alters the price! Nope, mind and go for a pre 2006 or you will be raped when you go to tax Quote Link to comment Share on other sites More sharing options...
Steviekid Posted June 11, 2009 Author Share Posted June 11, 2009 Nope, mind and go for a pre 2006 or you will be raped when you go to tax On her £7.5k budget I think it will have to be! Quote Link to comment Share on other sites More sharing options...
Hobgoblin Posted June 11, 2009 Share Posted June 11, 2009 Just taxed mine at £225 for 6 months- 56 reg Ouch. Quote Link to comment Share on other sites More sharing options...
pistonbroke Posted June 11, 2009 Share Posted June 11, 2009 There has always been a massive amount of confusion when it comes to displacement of wankel engines. The key for comparing the displacement between the 4-cycle engine and the rotary engine is in studying the degrees of rotation for a thermodynamic cycle to occur. For a 4-cycle engine to complete every thermodynamic cycle, the engine must rotate 720° or two complete revolutions of the crankshaft. The rotary engine is different. The engine rotor rotates at 1/3 the speed of the crankshaft. On two rotor engines, front and rear rotors are 180° offset from each other. Each rotation of the engine (360°) will bring two faces through the combustion cycle (the torque input to the eccentric shaft). This said, it takes 1080° or three complete revolutions of the crankshaft to complete the entire thermodynamic cycle. Obviously, we have a disparity. How can we get a relatable number to compare to a 4-stroke engine? The best way is to study 720° of rotation of the two-rotor engine. Every 360° of rotation, two faces of the engine complete a combustion cycle. 720° will have a total of four faces completing their cycle. 40ci(654cc) per face times four faces equals 160ci or 2.6L. That’s a well-reasoned number and now gives us something to be able to compare to other engines. In addition, since four faces passed by in the comparison, it’s like a four cylinder engine. Now we know, the 13B compare well to a 2.6L 4-cylinder 4-cycle engine. Quote Link to comment Share on other sites More sharing options...
Todd Posted June 11, 2009 Share Posted June 11, 2009 Very educational (full article is here for those that are interested http://www.rx7.com/techarticles_displacement.html ) Quote Link to comment Share on other sites More sharing options...
formatzero Posted June 11, 2009 Share Posted June 11, 2009 Nope, mind and go for a pre 2006 or you will be raped when you go to tax As Todd says tax is hefty but found insurance to be quite cheap so it's swings and roundabouts i guess Quote Link to comment Share on other sites More sharing options...
Todd Posted June 11, 2009 Share Posted June 11, 2009 it's swings and roundabouts i guess shame it's find a cliff and dive off it when it comes to fuel consumption Just got rid of mine on Monday night and got a BMW 330ci instead, really liked the RX8 but just got fed up with the fuel bills, wouldn't mind if it was a Supra TT performance Quote Link to comment Share on other sites More sharing options...
Supra-Brett Posted June 11, 2009 Share Posted June 11, 2009 shame it's find a cliff and dive off it when it comes to fuel consumption Just got rid of mine on Monday night and got a BMW 330ci instead, really liked the RX8 but just got fed up with the fuel bills, wouldn't mind if it was a Supra TT performance Isnt fuel the least of your worries with the wankel engines ? The RX7s are renowned for needing re-builds and breaking, and from what i hear the RX8 is worse. Ive read all sorts of articles about not driving it at all (not moving an inch) until the engine is up to temperature. They seem good price wise to buy, but fuel and breakages surely more than out weigh the initial cost ? Quote Link to comment Share on other sites More sharing options...
Steviekid Posted June 11, 2009 Author Share Posted June 11, 2009 As Todd says tax is hefty but found insurance to be quite cheap so it's swings and roundabouts i guess Yeah, her insurance is going to be under £300 which is quite annoying. Not as annoying as the fact she managed to get a graduate loan from the bank that's only 3% though!! Quote Link to comment Share on other sites More sharing options...
Todd Posted June 11, 2009 Share Posted June 11, 2009 The RX7s are renowned for needing re-builds and breaking, and from what i hear the RX8 is worse. Ive read all sorts of articles about not driving it at all (not moving an inch) until the engine is up to temperature. Nah, just a myth, the renesis engine is perfectly reliable in the 8 but then it's not under any kind of forced induction like the RX7 was. You're not supposed to shut the engine down until it's up to temp, so no just moving it out the drive and switching it off but even that's not a hassle as you just hold the revs high for a few secs and problem solved. Other myth, uses loads of oil, that's rubbish as well, I used about a litre every 1000-1500 miles. All in I rate them highly, especially if you like the B roads, handling is truely fantastic. Quote Link to comment Share on other sites More sharing options...
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