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TOPIC: Re:Fuel grade
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Re:Fuel grade 11 Months, 2 Weeks ago
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No problems with running regular 87.
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Joe
2009 Road Star Silverado S
2009 Ultra Classic Electra Glide
Star Touring & Riding
HOG
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Re:Fuel grade 11 Months, 2 Weeks ago
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well im getting poor mileage now, cant test my theory since its been raing.. yet i build race cars and we try to run on 93 pump or higher. the higher the octane the slower it burns. also runs cleaner prevents knock/ping, most say you get more mpg.
try to find what you believe the bike runs better on. these bike come low compression so low octane shouldnt hurt it.
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The Clinics Young Buck
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Re:Fuel grade 11 Months, 2 Weeks ago
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Knew it was coming! What's the compression ratio in your single plug 2 valve race car?
When have long strokes, not big bores, low compression by modern standards, 4 valves per cylinder for efficient cylinder filling and cooling, and as I'd that's not enough, 2 plugs in each jug to light her off from both sides at once. No high octane ever needed. Yamaha worked their butts off for that.
HD uses high compression to make bigger torque, and are using old head technology. That's why they MUST run high Octane to run right.
Run 87, a  nd enjoy yet another benefit of owning a Road Star! |
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Re:Fuel grade 11 Months, 2 Weeks ago
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jd750ace wrote:
Knew it was coming! What's the compression ratio in your single plug 2 valve race car?
When have long strokes, not big bores, low compression by modern standards, 4 valves per cylinder for efficient cylinder filling and cooling, and as I'd that's not enough, 2 plugs in each jug to light her off from both sides at once. No high octane ever needed. Yamaha worked their butts off for that.
HD uses high compression to make bigger torque, and are using old head technology. That's why they MUST run high Octane to run right.
Run 87, a nd enjoy yet another benefit of owning a Road Star!
my personal car, 4 valves per cyclinder its 13.8.1 daily on pump gas. i assume you mean 2 intake and 2 exhaust valves?
honestly i didnt take that into account, however since these bikes are air cooled wouldnt it be a good idea to keep as cool as possible? i dont know much about my bike yet its sad! i havnt owned any type of crusier before. im used to four wheelers, dirt bikes and sport bikes.
always open to answers or pointers.
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The Clinics Young Buck
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greenpus (User)
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Posts: 2147
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Re:Fuel grade 11 Months, 2 Weeks ago
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NJ_Road* wrote:
jd750ace wrote:
Knew it was coming! What's the compression ratio in your single plug 2 valve race car?
When have long strokes, not big bores, low compression by modern standards, 4 valves per cylinder for efficient cylinder filling and cooling, and as I'd that's not enough, 2 plugs in each jug to light her off from both sides at once. No high octane ever needed. Yamaha worked their butts off for that.
HD uses high compression to make bigger torque, and are using old head technology. That's why they MUST run high Octane to run right.
Run 87, a nd enjoy yet another benefit of owning a Road Star!
my personal car, 4 valves per cyclinder its 13.8.1 daily on pump gas. i assume you mean 2 intake and 2 exhaust valves?
honestly i didnt take that into account, however since these bikes are air cooled wouldnt it be a good idea to keep as cool as possible? i dont know much about my bike yet its sad! i havnt owned any type of crusier before. im used to four wheelers, dirt bikes and sport bikes.
always open to answers or pointers.
I run my bike down the interstate when it 100 degrees out. No pinging going up hills. 87 is all you need in these bikes. Someone here said he ran 89 in the summer to help keep the rear jug from pinging (detonation) since it's the one that runs the hottest and leanest. I started doing that but I don't know if it helps lol
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Last Edit: 2012/06/08 05:15 By greenpus.
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Re:Fuel grade 11 Months, 2 Weeks ago
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The intake swirl from the dual intake valves, and the surface area of 2 exhaust valves to absorb and dissipate heat does more to stop pinging than the fuel
Like I said, Yamaha worked their tails off for your benefit in this motor. Your high compression car (anything above 11.0 is considered high) needs the 4 valves for torque, but needs the octane because it generates so much more heat in a given cycle with all that compression.
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texasscott1 (User)
Two of a kind
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Re:Fuel grade 11 Months, 2 Weeks ago
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I've run 89 in mine during the hottest part of the summer and picked up between 1 and 2 mpg along the same route. If there was any detonation with the 87 I couldn't hear it but to gain fuel mileage with a jump in octane indicates it was happening.
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My 99 Standard Test Mule
Scott B.
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Re:Fuel grade 11 Months, 2 Weeks ago
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Scott, agree that picking up mileage does indicate that something inefficient was taking place. Most curious that you could not hear it. Could it be masked in the normal symphony of the motor? Now I want to try this on a 100 degree day.
BTW, where's that steamer? S.A. transportation museum? |
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texasscott1 (User)
Two of a kind
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Re:Fuel grade 11 Months, 2 Weeks ago
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JD, During highway riding I wear ear plugs because of the wind noise. Between that and the noise from my '99 I doubt I would ever hear any slight detonation.
That engine is sitting next to the old depot right here in town. It has got a fence around it so we can't climb around on it. Looking at it brings back some memories.
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My 99 Standard Test Mule
Scott B.
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