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+--- Thread: Fuel Choices (/showthread.php?tid=5542)
RE: Fuel Choices - kmoney_imp - 07-18-2016
That consumer reports test is interesting. They don't specific what engine is used in the test, but I'm guessing it had direct injection (I. E., gas shoots straight into the combustion chamber and not into the intake tract, cleaning the intake valve on the way). It would be crazy to see a non/DI intake valve that looked that bad, especially after only 4000 miles.
Still an interesting article.
RE: Fuel Choices - dsinned_imp - 07-18-2016
I use Chevron gasoline exclusively, and fill up with regular 87 PON. However, I top off with 89 PON every so often just to make certain, I have a little extra head room on the octane rating. All grades of Chevron gas have the additive "techroline", which I believe is one of the best on the market. I've heard Shell is pretty good too. Chevron (and Shell) gas usually costs more than other brands, mainly, I believe, because of their higher quality additives.
RE: Fuel Choices - the Ferret - 07-18-2016
(07-18-2016, 02:42 AM)kmoney_imp Wrote: That consumer reports test is interesting. They don't specific what engine is used in the test, but I'm guessing it had direct injection (I. E., gas shoots straight into the combustion chamber and not into the intake tract, cleaning the intake valve on the way). It would be crazy to see a non/DI intake valve that looked that bad, especially after only 4000 miles.
Still an interesting article.
where does a CB1100 inject the gas?
RE: Fuel Choices - redbirds_imp - 07-18-2016
(07-18-2016, 05:23 AM)The ferret_imp Wrote:(07-18-2016, 02:42 AM)kmoney_imp Wrote: That consumer reports test is interesting. They don't specific what engine is used in the test, but I'm guessing it had direct injection (I. E., gas shoots straight into the combustion chamber and not into the intake tract, cleaning the intake valve on the way). It would be crazy to see a non/DI intake valve that looked that bad, especially after only 4000 miles.
Still an interesting article.
where does a CB1100 inject the gas?
Since we have throttle bodies I would presume fuel is injected there. The Motus was to be the first bike with direct injection but that was dropped before the bike was brought to market. Direct injection requires very high fuel line pressure and maybe that is a problem to design into a motorcycle engine.
I have experimented with different fuel grades and non ethanol fuel. My CB has never knocked or pinged from using 87 octane even in extreme temps. Switching to "high quality" premium has never shown me an advantage. I have noticed a slight increase in mileage when I've used regular non ethanol. I do run some Sea Foam through it at times though I can't tell if there is any advantage in doing so. Sea Foam does help the small engines in my mowers and chain saw run better.
RE: Fuel Choices - Lord Popgun - 07-18-2016
ferret, I think you have a '14 service manual? If so, look at the pic on page 1-42. The fuel is injected after throttle valve and before the intake valve.
You can also see it in the fuel section, but not the whole pic.
YOU could take the entire throttle body apart, take some pics and show us all. Let us know how it works out
RE: Fuel Choices - the Ferret - 07-18-2016
I have a 13 manual popgun (really should get a 14 don't you think?). Assume it is the same but I would have no idea what I would be looking at even if you showed me a pic. Maybe a moving diagram I would understand showing gas being sprayed somewhere lol
I understand carbs. I don't understand injectors, fuel injection, direct injection etc
RE: Fuel Choices - kmoney_imp - 07-18-2016
(07-18-2016, 06:01 AM)The ferret_imp Wrote: I have a 13 manual popgun (really should get a 14 don't you think?). Assume it is the same but I would have no idea what I would be looking at even if you showed me a pic. Maybe a moving diagram I would understand showing gas being sprayed somewhere lolIt's port injection. So it goes in just before the intake valve inside the intake manifold (so basically where carb boots were on older engines). GDI would be an awesome addition to motorcycles and would take power and efficiency way up.
I understand carbs. I don't understand injectors, fuel injection, direct injection etc
https://m.youtube.com/watch?v=pQjIR2juqLs
RE: Fuel Choices - AzBob_imp - 07-18-2016
(07-18-2016, 05:39 AM)redbirds_imp Wrote:(07-18-2016, 05:23 AM)The ferret_imp Wrote:(07-18-2016, 02:42 AM)kmoney_imp Wrote: That consumer reports test is interesting. They don't specific what engine is used in the test, but I'm guessing it had direct injection (I. E., gas shoots straight into the combustion chamber and not into the intake tract, cleaning the intake valve on the way). It would be crazy to see a non/DI intake valve that looked that bad, especially after only 4000 miles.
Still an interesting article.
where does a CB1100 inject the gas?
Since we have throttle bodies I would presume fuel is injected there. The Motus was to be the first bike with direct injection but that was dropped before the bike was brought to market. Direct injection requires very high fuel line pressure and maybe that is a problem to design into a motorcycle engine.
I have experimented with different fuel grades and non ethanol fuel. My CB has never knocked or pinged from using 87 octane even in extreme temps. Switching to "high quality" premium has never shown me an advantage. I have noticed a slight increase in mileage when I've used regular non ethanol. I do run some Sea Foam through it at times though I can't tell if there is any advantage in doing so. Sea Foam does help the small engines in my mowers and chain saw run better.
Since we have throttle bodies I would presume fuel is injected there. The Motus was to be the first bike with direct injection but that was dropped before the bike was brought to market. Direct injection requires very high fuel line pressure and maybe that is a problem to design into a motorcycle engine.
Probably has something to do with the fact that, apparently, direct injected engines have two fuel pumps, one in the fuel tank, and the very high pressure one that is connected directly to the engine that pressurizes the rails. I'm guessing that kind of packaging is difficult on a motorcycle.
RE: Fuel Choices - redbirds_imp - 07-18-2016
Throttle body injection is the simplest and least efficient and is similar in function to a carb. Port injection is more efficient, injecting the fuel into the intake port ahead of the intake valves. Direct injection is the most efficient, injecting fuel directly into the combustion chamber.
RE: Fuel Choices - the Ferret - 07-18-2016
(07-18-2016, 06:24 AM)kmoney_imp Wrote:It's port injection. So it goes in just before the intake valve inside the intake manifold (so basically where carb boots were on older engines). GDI would be an awesome addition to motorcycles and would take power and efficiency way up.(07-18-2016, 06:01 AM)The ferret_imp Wrote: I have a 13 manual popgun (really should get a 14 don't you think?). Assume it is the same but I would have no idea what I would be looking at even if you showed me a pic. Maybe a moving diagram I would understand showing gas being sprayed somewhere lolIt's port injection. So it goes in just before the intake valve inside the intake manifold (so basically where carb boots were on older engines). GDI would be an awesome addition to motorcycles and would take power and efficiency way up.
I understand carbs. I don't understand injectors, fuel injection, direct injection etc
https://m.youtube.com/watch?v=pQjIR2juqLs
https://m.youtube.com/watch?v=pQjIR2juqLs
Ahh... see the moving pics helped a bunch. Thanks Kmoney.