I would try it first just as it is, if you have the problem you can easily do the mod yourself...Take the carb and block off and look at the block..You will see the pulse hole in the block..Take a #29 drill and carefull drill from the outside of the block just deep enough to intersect the pulse hole..Tap the hole with an 8-32 tap..Unscrew the pressure tap from it's old location and plug the hole with a set screw..carefully screw the pressure tap into the new hole..Use some thread sealer to keep the tap from leaking...The wall thickness on the pressure tap is pretty thin, don't use much pressure when you screw it in..Connect the tap on the back of the carb to the fitting using the same hose, or if it's too short use a new one, length is not critical...You can rotate the carb if you want, it will make no difference where it goes...If you don't want to rotate the carb the shaft can be taken out and reversed...No rocket science needed here, just a little care...If the metal fitting on the back of the carb faces the wrong direction just twist it around, it's just a press fit in the hole...
If you happen strip the hole in the block some JB weld around it will work just fine, there's no heat there...
RCIGN Thanks a lot for your explanation in how to move the pressure tap location. I have installed pressure taps in glow engines before, so as you said it is not difficult and don´t think it will be a problem. However, I think I did not explained myself right in my question about the location of the pressure tap whether the engine is mounted vertical or horizontal. My guess is that the fuel tends to puddle in the bottom of the carb block because of gravity and DA is trying to avoid this by placing the pressure tap in there. Maybe the pressure pulse going trough the pressure tap will remove any fuel that migh accumulate there. If this is true, the bottom of the carb block (and therefore the pressure tab location) will be different in an engine that is mounted vertical compared to one that is mounted horizontal (90° apart). I hope you can get my point, Trying to explain something when English is not your first language can be hard sometimes... [&o] Anyway, If my guess is wrong would you explain me what difference does it make where the pressure tap is now in the DA 50 as where it was before?. I though that you can place the pressure tap in an engine anywhere as long as you get a good pulse?.
I'm sure there is a lot of DA's that have been run many hours without failure. I would guess the failure rate is dirrectly related to the type of flying. If your flying circles, loops, and not stressing the engine I'm sure it will be fine, However if your flying balls to the wall 3D, hovering and such with the old rod, your days are numbered. And so is your plane if it quites while your torque rolling 10 feet off the deck.
Here's what confuses me. DA could easily give a statement on this forum and clear up all the speculation. Other manufacturers do this. Take for instance Hitec. You can ask the factory rep anything you want on RCU. At the present time they are being pounded with questions about the 5955 Digital servo. It has problems, however Hitec is keeping people informed of the progress.
john
John, I agree with you 100% about DA letting everyone know what is going on with its engine (I guess that is difficult knowing that you have 2000 potencial problems (engines) out there). When I first saw this engine I knew I wanted one. I waited for more than one year to get one in order to have all the problems (new engines have) sorted out. I guess I didn´t wait enough.
I am sure for what I have read that DA will take care of all of us, unfortunately I am too far away and for me is going to be more difficult[
]
I still would like to know about people that have put hundreds of flights on one of these engines with the old rod whithout failure. Maybe I will be one of the many lucky ones...
Andres