Pressure fitting placement

[normlee]

Tried searching for the answer sorry.

Where is the best place to put the pressure outlet please? It's a 15cc macs muffled pipe with 1" flat band.

Thanks!

 

[Ray Sametz]

 

[normlee]

Ok thanks, so you suggest the start of the flat section or just before

 

[j whiddon]

Just before the flat section.

 

[TomGracey]

Yup just before or in the flat section

 

[Danny King]

Anywhere on the pipe except the stinger. Just not on the bottom as oil can find its way I to the fitting. 

 

[Jim Allen]

Anywhere on the pipe except the stinger. Just not on the bottom as oil can find its way I to the fitting. 

Danny,

I am sure this is the correct approach. If the pressure was measured from the header to the beginning of the stinger, it would be found to be the same at different locations for whatever the engine RPM is. This would be true for both gas & nitro engines. I have measured this pressure with a 0 to 200 inches of water gage, at different engine RPM's, on both gas & nitro engines of different displacements. Since the pressure is very low this gage was selected because it measures in increments of 5 inches of water or .1806 psi. Any change in a stinger's length or ID will effect the pressure & this can be easily seen. The reason that I moved the pressure outlet from the header to the mid section was because of the difference in the operating temperatures between nitro  & gas engines. I use a Neoprene rubber line on a gas engine pipe & a silicone line on a nitro engine. Most readings will be in the 90 (3.252 psi)  to 110 (3.974 psi) inches of water range at WOT.

Jim Allen 

 

[normlee]

Great info, thanks!