Do you seal the spray bar to the case
What sealant do you use
I was running my OS normally very consistant could not figure out what was wrong
Turned out Spray bar was loose I guess when the case heated it the problems started
thanks
Fred Q
Fred
That is 2 different problems your asking about
First the NVA should not come loose, tightening it should fix that problem
Second thing your asking is leaking spray bar not sealing on the edges, I have never had that but I have seen many dozens of leaking NVAs not sealed against the side, For the vast majority of this I found the problem was tiny chips debris etc, The mostly come from the Spraybar threads cutting tiny pieces of the case or venturi, Especially when using a delrin venturi in a true venturi, Press too hard and the threads can shave off debris, press too little the exact same thin can happen. The debris gets stuck in the threads and when you tighten the nut down to hold the bar, it pushed the debris up against the case , between the nut and case and ...you gotta leak...
I take a toothbrush or pipe cleaner and clean the threads before the nut goes on, I see this a lot on engines sent back in for rebuild.
The second thing causing leaks would be damage to the case at the point the bar goes thru. Then white clear black red blue or grey silicone put on carefully with a toothpick, will seal it up with no worries. I have sealed ones from customers and I use any color silicone just so I can see it better
Randy