How much compression is to much to spray 3 systems???? Thanks
Not true!!! With a lot of compression you can simply only stuff so much nitrous into the cylinder. My current combo has 16+. 1 !!!! On two systems its awesome, but soon as I try and light 3 its a different ballgame. I was told that 13.1 to 14.5 is great for 3 plus systems but 15+.1 and up is only good for 2 systems. Steve Johnson you out there????It is my understanding that higher compression is not an issue, but rather it just narrows the tuning window on n20. I have almost 15:1 compression on my 582. When in doubt, take another couple of degrees out, and read the plugs from there.
Thanks Monte!!! Its a 14.5 Sonny's non conv. headed BBC. So far I havent had any problems tuning the 2 systems!!! Its when I turn on the 3rd is the problem, it starts popping and banging through the exhaust!!!! Dont have chance to read the plugs on 3 cause it instantly starts popping so I lift.Not really about static compression, but more about "dynamic compression", which is actually what the motor sees when it's running. Static compression, quench and cam timing, ALL effect the dynamic compression. On a big block, I typically don't like to see more than 14.5, although I have had some Pro-Mod customers with over 15 and had no issues. Some of the motors we had with over 15, when we freshened them, we lowered the compression .5 to 1 point and saw no decrease in power and the tuning window was larger. Some of it also depends on the head. To get lots of compression in a conve headed motor, generally means huge domes. Not the best thing for flame travel and a clean burn. So if I had to pick a number, I would say 13.5 max on a conv motor and 14.5 on a spreadport.
Sounds like possibly a tune up issue ??? Missing the fuel and or the timing..Thanks Monte!!! Its a 14.5 Sonny's non conv. headed BBC. So far I havent had any problems tuning the 2 systems!!! Its when I turn on the 3rd is the problem, it starts popping and banging through the exhaust!!!! Dont have chance to read the plugs on 3 cause it instantly starts popping so I lift.
OK where is Monte and Steve???????Hey guys I forgot to mention one thing. I have an aluminum Brodix block that is not o-ringed. I tried a different set of head gaskets this past season. When I pulled the engine down I found that the cylinders were crossing over to each other because the Cometic MLS gasket was leaking. I decided to leak it down hot before calling it a season. The engine only had 35 passes on it with two systems max. I had 3 or 4 cylinders at 60% leak and the rest were at 30% to 40% leak. Had a shit ton of reversion in the intake side of the head and into the intake runners. I am switching back to the black 1077 Fel Pro MLS gaskets. I am having the heads and block machined just enough to straighten them out and we are also going to machine a little off the pistons. This is probably a stupid question but could some or all of the problem have been that the head was not properly sealed to the block?