also consider that if you travel to ride you must always take all the fuel you will need for the trip with you, cause you won't necesarily be able to get the 110 where you are going. I take one gas can and refill it in whatever town I'm in as needed, some of my buddies with the higher compression have to take 4 or 5 cans of 110 and hope they don't run out before the end of the trip or else they'll be sitting in camp instead of out on the dunes bowling with the guy pulling 1 HP less they would be...if they had gas.

Just throwing out all the pros and cons, for info sake. With me being in Indiana we have to drive 24 hours for big dunes, and hauling an extra 300 pounds of fuel in very inconvenient.

 

When going to more compression, most are not looking for more horsepower, we got that with the big cams. What we are looking for is to regain the torque, or bottom end (what have you). So the more interesting part to know would be the torque difference, if anybody could share that.I do know that going from stock to 11-1 made a huge difference in bottom end, then get on our 14-1 bike and theres another huge difference. But as Hightower said, if you just a duner, the added comp would be more of a hinderence since you would have to pack more high octane fuel. On our duner we give it as much compression as possible and still maintain pump premium.

 

Once you get into these racing fuels, I would think there would be a leaded unleaded issue. Can someone inlighten me?

 

I think most fuels at 110 and above are leaded, which is great for the valves!

 

If you are not planning on running Nitrous, I think the 14:1 pistons out there are very good. Ron Wood has them and so does HP Research. However, a 14:1 piston can be too much compression when you also add a big shot of Nitrous. Personally, the 12:1 offers good performance with and without Nitrous from the folks that I know.

 

What's wrong with 14:1 and NOS?

 

Whats wrong with 13:1 and NOS?[img]i/expressions/face-icon-small-happy.gif[/img] Its just a matter of proper tuning and paying close attention to octane. Then you have the timing issue. Im not running retarded timing on the button with a 25hp shot. Zero problems but you have to know what your doing. As far as the fuel issue I have never run out of fuel (2 5gal can + Full tank) in a weekend trip. And we ride hard all day. 1 extra can isnt that much of a hinderance with exception of the cost. just my .02

 

Nothing if you watch your other variables. What Scatterbrain said - he beat me to it![img]i/expressions/face-icon-small-wink.gif[/img]

 

I agree with oldmanracing. I don't know how accurate the 3%, 2.5, 2.0 numbers are, but it gives you a good idea of what's going on and they aren't too far off.
Now, for the rest of the story...
Compression, cylinder pressure, and cam shafts all work together. So, give me more compression, and I can give you a better camshaft. Then, we can turn that 2% gain back up to a 3% gain. [img]i/expressions/face-icon-small-smile.gif[/img]

As for what mrhorsepower said, build a better engine and you can make more power with less NOS- that has always seemed more reliable/dependable than throwing a big NOS shot on to make up for power your engine is missing.
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I makes ya grin all night LOL