Oops. I wasn't ignoring the question. I still have the stock one. I've been running on prime til I can get the Raptor petcock.

Run it gently 10-20 min at a time till it starts to get lighter and lighter. It will, or should.
Cool.
srinath.

Well Gyro, I was told going to the 95mm wiseco piston that I'm now up around 10 to 1 compression ratio. Premium was recommended.

Gyrobob wrote on 11/07/12 at 05:53:05:


Yep.....and if you buy fuel from those pumps that have all 3 blends coming out of the same hose.....you are probably getting 3/4 gallon of regular before the premium fills up the hose and starts running into your tank.

Volume of a cylinder is  Pi X r squared X height

If the manifold at the bottom of the computer ( which is just a flow meter that is attached to sending units that trigger the displays now) is 10 feet from the end of the nozzle, & the ID of the hose & internal plumbing is 3/4" ( which I think is pretty close based on what Im remembering seeing when I was working inside the pumps), then
3.1416 X .375 X .375 = .4417875 square inches ( area of a circle)
times the height of the cylinder, or length of the tube,
so
.4417875 square inches times 120 inches ( inches squared X inches will = inches cubed) = 53 cubic inches.
There are 231 cubic inches in a gallon, so, youll get about a quart of whatever was pumped last.,depending on these variables, plumbing ID & length of hose. I cant imagine getting more that 3 pints or less than 1.

Tom K wrote on 11/06/12 at 05:32:49:

I was always taught,.. smoke when running is rings,.. smoke upon start-up is valve stem seals...

Some stations still have mid-grade tanks.  That gas is usually pretty old.

Even if you do purchase midgrade at a station that mixes regular and premium before the pump to dispense mid-grade, at the quantities we use, it might as well be the same thing.  The gas in the mid-grade nozzle, and the lines/pumps leading to it, has probably been sitting there for quite a while.  I seldom put in more than 1.5 gallons in the RYCA, with the iddybiddy tank it has, so if I were to use mid-grade gas, I'd probably have a large portion of it quite stale.

This is kind of a silly discussion, anyway, because there is never any reason for any of us to use mid-grade anyway.  If your vehicle of any sort is not pinging, and the manual says regular is okay, using any gas other than regular is stupid.  Midgrade and/or premium has less energy in it than regular, and has no advantage at all except to the oil companies. Some stations still have mid-grade tanks.  That gas is usually pretty old.

Even if you do purchase midgrade at a station that mixes regular and premium before the pump to dispense mid-grade, at the quantities we use, it might as well be the same thing.  The gas in the mid-grade nozzle, and the lines/pumps leading to it, has probably been sitting there for quite a while.  I seldom put in more than 1.5 gallons in the RYCA, with the iddybiddy tank it has, so if I were to use mid-grade gas, I'd probably have a large portion of it quite stale.

This is kind of a silly discussion, anyway, because there is never any reason for any of us to use mid-grade anyway.  If you vehicle of any sort is not pinging, and the manual says regular is okay, using any gas other than regular is stupid.  Midgrade and/or premium has less energy in it than regular, and has no advantage at all except to the oil companies.