Nothing is accurate in this situation? His or mine? Look at the specs quoted for his situation, with mildly ported stock heads and no more cam and compression than he has a bigger carb does nothing worth spending big bucks on. Someone recommended a 1050 dominator, only with serious port work, bigger valves and more cam would this be feasable.
I had already said the cam is all wrong. I recommended a cam before all else. The carburetor was definitely going to be next in line..
Using Holley's CFM formula even 850 is to big. I run a 750 vac sec carb to help achive some economy as this motor drinks enough gas as it is much less pay $500.00 for a double pumper. The Panther logs i run had serious port match problems to the heads.
You can take the Holley carburetor formula and throw it in the trash on a jet. The formulas were calculated for variable torque like in a car or even a V-drive, the torque curve on a jet pump is
completely linear, meaning as soon as the torque curve flattens out, so does the gain in RPM. (there is actually a slight gain, but not much). The vacuum secondary carburetor you have, even with the lightest secondary spring is keeping the rpm's limited and if it were not for the Panther jet pump being super inefficient you would not be pulling the revs that you are. Plain and simple fact is that you are comparing a pineapple to a plumb. Mean no offense at all.
I used gaskets and opened up head ports as well as log ports and could tell big difference in performance. I did extensive porting and polishing to this heads. My mini cruiser seats up to 8 passengers, holds 50 gallons gas and sometimes pulls 2 to 3 skiers, I need all the low end grunt I can get. Idle is just fine and boat launches like a rocket.
I will personally guarantee you are not using any of this "low end grunt". The pump does not eat ANY torque until it gets to approximately 3500 RPM, then from there it is linear all the way up until it blows apart or cavitates so bad it stops moving more water.
Again, comparing a pineapple. His logs are some of the best made, there is not a lot more to gain in that arena IMHO, more cam, potentially some carburetor work and it will wake up to smell the coffee.
I live where summers are 100-105 deg. at 1800' altitude. Just trying to help the guy out with what worked for me. JUST MY OPINION
He was at more than twice the altitude, making getting the required air into the cylinders more than twice as difficult. that is why I recommended more carburetor.
We had a house at Lake Tahoe until this last year, trust me when I say you simply cannot get enough air into the motor. On the cruiser, I had installed two bilge blowers to push air into the engine compartment, believe it or not, we picked up nearly 100 RPM, although I think it was because the air charge was cooler...
Don't be offended, just adding to what you are saying. You can't argue with real life. It is all fact.
GT
