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Post by Blackruk on Aug 6, 2007 19:30:21 GMT -5
>:(The pistons are high compression designed to work with 91 octane gas I wanted 93, but there is a lot of places where the highest is 91, so it is design for 91, some people have CDI and modded heads and report advantages to using higher octane, but i have not confirm that I've never seen 91 around here. All we have is 87, 89 and 93. So 93 is all my big bore ever gets. I remember someone on the boards posting that it akes almost five liters for a pump to switch between the underground tanks. I hope that's not the case. I doubt it's true. If it were, I think we'd all be showing ill effects.
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Post by chanito on Aug 6, 2007 20:22:34 GMT -5
Here in Miami we do not have 91 either, but there is no 93 on California and on some other states so they have to do with 91 I usually pump my gas on station with diferent hoses for the diferent octanes so i do not have to worry about what kind of gas is on Katrina
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Post by Kami no Chiizu on Aug 6, 2007 22:52:29 GMT -5
That's an interesting avatar you've got there, Chanito...
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Post by Dandy Dan on Aug 7, 2007 9:50:19 GMT -5
I remember someone on the boards posting that it akes almost five liters for a pump to switch between the underground tanks. I hope that's not the case. I doubt it's true. If it were, I think we'd all be showing ill effects. What I did was I would only go to gas stations that have a seperate pump for the high grade stuff. If they didn't, they I would drive around and find a pump at which the last person put in high grade stuff. It might not be 5 litres to switch but it's certainly a couple. If I had to fill up my big bore Ruck from a pump that previously pumped 87 then I would pump 94 in so that if it's half 87 and half 94 then it would work out to a decent average.
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Post by chanito on Aug 7, 2007 19:14:05 GMT -5
That's an interesting avatar you've got there, Chanito... That is a GI squirrel i took the pic from some guy over at TR and i love the pic so much i made it my avatar (hope he does not mind)
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wonderslicer
Junior Ruckster
Ruckass sold me his wicked scoot so be nice to me ok
Posts: 97
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Post by wonderslicer on Aug 7, 2007 22:38:39 GMT -5
That's an interesting avatar you've got there, Chanito... Your prediliction for derailing threads is perverse, Kami!
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Post by Kami no Chiizu on Aug 8, 2007 0:23:37 GMT -5
I didn't get where I am today by staying on topic.
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Post by skuuter on Aug 8, 2007 3:10:46 GMT -5
Interesting thing I learned from some Interceptor folks when I had mine. Gas mileage went up and engine temps went down when I took their advice and switched to the low octane gas. Had always ran high octane premium in my motorcycles and scooters. Not anymore.....cheapest for me and no pinging, etc. in anything..........I would not have believed it if I hadn't tried it....my 2 cents on the subject.............
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Post by Dandy Dan on Aug 8, 2007 9:08:45 GMT -5
I didn't get where I am today by staying on topic. Ha Ha Ha
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Post by buntdeer on Feb 18, 2008 20:22:49 GMT -5
Ok so then after the guy at the store tells us that it is ok to use 93 or 110 as I do in my Road King with a stroker motor you guys are telling me to stay away from it and use the regular 89 ? or is 83 ? whatever the lowest available . Your stroker RoadKing has a 10.5:1 compression or higher... Thus you need at least 92 octane! Where as a ruckus has what.... 8.5:1 or 9.5:1....?? Which means less octane.. Don't put anything lower than 92 in the Harley! Or you'll blow that baby up!! And don't put diseil in it either!! ha...
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Post by chanito on Feb 19, 2008 20:07:06 GMT -5
The ruckus is indeed a very hi compression engine (200psi is a decent compression on a compression test) our compression is 11.9 to 1 and the big bore is 12.5 to 1, that is the benefit of a well design water cooled hemi head with flat top piston The ruckus engine is the most advance 50cc scooter engine in the world. The ruckus rules ;D ;D
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Post by smartbomb on Jul 29, 2008 13:08:53 GMT -5
So do you guys think that if you have an engine tuned right on the edge of leaness for max power you can still get away with 87 on these motors?
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Post by chanito on Jul 29, 2008 19:04:33 GMT -5
On an stock engine yes, the lower the octane rating, the faster gas burns and the cooler the engine runs, the problem begins with preignition which shoots temps really high, back in my SCCA days the trick to get an engine to not overheat was to modify the head until you could run a lower octane gas and presto no more overheating Oh! how i miss those engine dyno days, now people rather use a chasis dyno
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Post by smartbomb on Jul 30, 2008 17:41:49 GMT -5
So even with jetting on the edge of leaness and a CDI with advanced timing (basicaly my set up) 87 is ok as long as you have the stock compression?
I was running 91 just because of my right there jetting.
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rocker
n00b Ruckster
Posts: 17
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Post by rocker on Aug 2, 2008 8:51:04 GMT -5
It depends of what kind of gas you guys talk about. Of course, the "high octane" gas you can get at a gas station is not going to give you better performance, it's only going to make you engine run a bit cleaner but the race gas that you can only get in special shops is going to boost your performance. Of course, we are talking about 115 + of octane level in the gas. This is an other story. I am not so sure about the high compression theory and for the thing that says that the high octane burns less is not true at all. I have made the experiment. Not only does it boost my performance, it also helps keep my engine running clean.
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Post by smartbomb on Aug 2, 2008 10:45:35 GMT -5
Unless you have the boost, compression or timing to exploit it, race gas will make you lose power.
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Post by Dandy Dan on Aug 17, 2008 11:34:19 GMT -5
the "high octane" gas you can get at a gas station is not going to give you better performance, it's only going to make you engine run a bit cleaner but the race gas that you can only get in special shops is going to boost your performance. Of course, we are talking about 115 + of octane level in the gas...the thing that says that the high octane burns less is not true at all. I have made the experiment. Not only does it boost my performance, it also helps keep my engine running clean. Umm.....do you realize what octane is? Octane is not some highly explosive additive as fuel companies would have you believe. The purpose of octane is simply to prevent pre-ignition (pinging) in your engine. Thus, if you have no pinging on regular gas, there is absolutely no need for higher octane gas. Worse, it actually makes you slower because octane is essentially filler in gasoline. As you add more octane, you get less gasoline in your gas, so you get less potential energy per litre or gallon. It's nice to see someone who gets it: Unless you have the boost, compression or timing to exploit it, race gas will make you lose power.
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Post by smartbomb on Oct 8, 2008 13:20:06 GMT -5
I think our bikes might not like 87 octane if you have a CDI which I presume has a more agressive timing curve based on my observations lately.
I made my last tankful 87 regular since so many people say that our bikes like the stuff. When riding at wide open throttle, I could hear a faint mettalic tinking noise and I lost some speed, I was only able to hit 47-48 mph, slower than my usual 50 mph and it took a long time to get up there.
I was thinking that maybe my jetting was off for the atmospheric conditions and the noise I was hearing was the variator rattling. I was experimenting with Dr Pulley sliders at the time (which work aswome).
Well, time to fill up again and I put 91 as usual in it and guess what, the noise was gone and my bike is back up to hitting 50 mph if given enough space and no wind. I suspect I was hearing mild detonation and it was making me lose ring seal and power.
I think that my Posh CDI advances the timing and it needs more octane than 87.
Anyone else with a CDI hear the noise and lose power on cheap gas?
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Post by skuuter on Mar 5, 2009 15:37:14 GMT -5
I've run the lowest octane "regular" in my Ruckus for it's lifetime so far, but it has started to run better lately on the highest octane "premium".......gonna' keep runnin' it for a while. My top speed had fallen to 40 MPH on an 07, and really dead on long hill climbs (Kami can attest to this... ).......it is back up to 42 or so on flats, and 35 MPH on hills it had been fallin' off to 30 or less................... ;D....just for everyone's INFO
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Post by Dandy Dan on Mar 7, 2009 14:47:19 GMT -5
smartbomb, sorry to be so late on this one but yes, aftermarket CDI's have a more aggressive timing curve. I'm not sure how the different CDI's compare, but they all advance the timing somewhat.
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