13brv3
Well Known Member
Greetings,
I have a couple primer questions. First, am I the only one who is bothered by the thought of priming only 3 cylinders?
On the last RV-8 that I built, I used the top ports on my O-360 for primer, so that I could prime all 4 cylinders. To me, this seems like such a logical thing to do, but I can't get over the fact that no one else seems to do it that way.
Is there some reason people don't use those upper ports for primer? I know that using the bottom ports keeps you from having to go into the baffles, but that's really easy with a bulkhead T fitting, so I can't see that being a big reason not to do it.
I also know that it's perfectly acceptable to primer 2 or 3 cylinders, rather than all 4. If it weren't so easy to do all 4 using the upper ports, I would just live with 3. The only other (unlikely) justification for having 4 ports would be to allow some fuel flow if something (did I mention unlikely <g>) happened to the carb.
Second question, is does anyone know if Aeroquip 306 hose (mil-h-5593) is OK for use with gasoline? I'm looking for a flex hose in -2 size to use from the primer solenoid to the T in the baffles, and this is one of the only hoses I can find in a -2 size. Unfortunately, searching the Eaton/Aeroquip site for 306, or MIL-H-5593 comes up empty. Searching the Aeroquip catalog online also has no mention of 306 hose. Is Spruce making this up
http://www.aircraftspruce.com/catalog/appages/aq306.php
Thanks for any info, or engine priming philosophy you care to post.
Cheers,
Rusty (finishing cowl installation, then on to baffles...groan)
I have a couple primer questions. First, am I the only one who is bothered by the thought of priming only 3 cylinders?
On the last RV-8 that I built, I used the top ports on my O-360 for primer, so that I could prime all 4 cylinders. To me, this seems like such a logical thing to do, but I can't get over the fact that no one else seems to do it that way.
Is there some reason people don't use those upper ports for primer? I know that using the bottom ports keeps you from having to go into the baffles, but that's really easy with a bulkhead T fitting, so I can't see that being a big reason not to do it.
I also know that it's perfectly acceptable to primer 2 or 3 cylinders, rather than all 4. If it weren't so easy to do all 4 using the upper ports, I would just live with 3. The only other (unlikely) justification for having 4 ports would be to allow some fuel flow if something (did I mention unlikely <g>) happened to the carb.
Second question, is does anyone know if Aeroquip 306 hose (mil-h-5593) is OK for use with gasoline? I'm looking for a flex hose in -2 size to use from the primer solenoid to the T in the baffles, and this is one of the only hoses I can find in a -2 size. Unfortunately, searching the Eaton/Aeroquip site for 306, or MIL-H-5593 comes up empty. Searching the Aeroquip catalog online also has no mention of 306 hose. Is Spruce making this up
http://www.aircraftspruce.com/catalog/appages/aq306.php
Thanks for any info, or engine priming philosophy you care to post.
Cheers,
Rusty (finishing cowl installation, then on to baffles...groan)