Hi Tung
No worries mate ask as many questions as you want :)
Injection is definitely better for drive ability and fuel economy. Only reason people go carby here its quick cheap and easy to put on. Some also go injection just personal preference. No right or wrong way of doing it.
Yes gives you a lot more options to fine tune it for response,power,timing and fuel economy. You can tune it on low octane fuel dont need to use expensive fuel. Over here lowest octane is 91 and it will happily run on that.
Fuel consumption on stock S4 RX7 should be around 13l per 100km and a bit less on the highway. Provided the engine is in good condition and it has good tune.
If the engine is bit tired or poor tune it can easily go 20L per 100km.
In a 800/1000 this should be lower because of lighter weight.
Porting is only done when you are chasing more power. Here is a very good explanation about porting and what each port does .
http://www.ausrotary.com/viewtopic.php?f=16&t=47212
Rotaries do have a bad reputation for reliability. A lot of this is due to owners not understanding there engine and how to look after it.
Rotary engine uses a bit of sump oil to lubricate the seals and oil needs to be checked maybe weekly depends how much you drive it. If you go for a fast drive with lots of rpm next time you drive it check if it needs oil topped up before driving. Some people dont know this and all the oil will be gone before they do the next oil change. Oil consumption is normal this is how they are designed even the new RX8 works this way. I and most people change the oil every 5000 km and keep it topped up in between. Also use spark plugs recommended for the engine and change the coolant regularly.
All the NA rotaries I have had over the years have been reliable like my piston motors. Turbo rotaries can be problematic sometimes also depends how much boost you put into them haha :)
Another thing dont be afraid to rev it to red line they love it and prevents carbon build up.
They do require a little bit more maintenance than piston motor but all is worth it once you put your foot into it :)
I will warn you they are addictive :P haha
If there is anything else I can help you mate just ask :)
Cheers
Sinisa
Bookmarks