Harvester Gas Engine Fuel Octane Rating

[blmtnc]

Shockingly its only 4,300rpm when generating.

Wow, yeah, I'm gonna call BS on BMW's recommendation for premium in that application. Considering my motorbike runs a 12.2 CR, redlines at just under 12K, doesn't even have a knock sensor, and calls for only 90+ octane. Unless BMW is doing something with the combustion process that really induces knock (super lean mixture, higher than normal cylinder head temps, etc), I'm just not seeing it. But I am intrigued lol.

 

[timmyhil]

Wow, yeah, I'm gonna call BS on BMW's recommendation for premium in that application. Considering my motorbike runs a 12.2 CR, redlines at just under 12K, doesn't even have a knock sensor, and calls for only 90+ octane. Unless BMW is doing something with the combustion process that really induces knock (super lean mixture, higher than normal cylinder head temps, etc), I'm just not seeing it. But I am intrigued lol.

It did have to meet the environment emissions targets. They usually run on the lean side.

It happens to be one of my favorite engine to work on because of the complexity and the uniqueness of how it runs and is tuned.

 

[hayduke]

not a mechanic or engineer...but why not use LPG?

 

[timmyhil]

not a mechanic or engineer...but why not use LPG?

I believe it has to do with that its pressurized.

 

[hayduke]

yeah, but there are plenty of engines which are powered/converted to lpg, right? it's also generally cleaner than gasoline. (https://afdc.energy.gov/fuels/propane-benefits)

so figure if the Harvester version (which I've reserved) is solely to get us a another 150miles, and since I'm looking at the EV as a. "cleaner" vehicle than what I'm driving, why not use lpg?