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  #1  
Old 02-28-2015, 10:41 AM
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Relentless Relentless is offline
 
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Location: San Luis Obispo
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Default The First R409 Customer is flying!

I just returned from Anchorage AK where the first customer that ordered an R Series engine from Titan is up and flying. Josh and his crew spent about a week prior to my arrival converting his fuel and electrical system for the installation of Efii. He had to put return fuel ports back to both tanks, install new Andair dual valve, and rewire the electrical to accommodate dual pumps, battery and busses.

I showed up just as the new R409 was installed on the mount to help speed up modification of baffle, intake, and tune the efii system. Working with the owner, his mechanic, Randy Gossa, and the owners son made for a fantastic week!

This is one cool airplane, SQ12 monster cub!


Link to customers first takeoff solo

Owners son built his first carbon fiber part with me. The new oil cooler duct and airbox turned out perfect. We were all surprised that the oil temp was actually much lower than before using a smaller oil cooler on an engine producing lots more hp...


Beauty shot of the top of the R409 and AX50 cylinders


Josh, Randy, and Shawn made quick work of this conversion


Engine during build


Here is a shot of one of the bores after 5 hours break-in, perfect!


The latest ring packs are sealing perfectly, notice how clean the piston is below the oil rings. Once they start running unleaded fuel in this they will find the oil stays really clean between changes.


The new R409 with Efii weighed in at 282lbs. verses the Superior 400 that the owner removed at 304lbs. The R409 produced 230.1hp on dyno vs the Superior 400 advertized at 215hp. We should have the 400 on our dyno in a few days to get the "real" numbers.


Here is nice shot of EFii injectors and servo. The lower weight ACE components and Efii make this monster motor the smoothest these guy have ever flown.
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  #2  
Old 03-01-2015, 04:23 PM
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Saw that airplane at Valdez last year, what a monster. Should be even more impressive with the R409.
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  #3  
Old 03-01-2015, 08:49 PM
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Glas467 Glas467 is offline
 
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Very cool to see aviation engine technology advance, nice job!
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  #4  
Old 03-02-2015, 11:37 PM
N54SG N54SG is offline
 
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Default

Quote:
Originally Posted by Relentless View Post
The new R409 with Efii weighed in at 282lbs. verses the Superior 400 that the owner removed at 304lbs. The R409 produced 230.1hp on dyno vs the Superior 400 advertized at 215hp. We should have the 400 on our dyno in a few days to get the "real" numbers.
I'd be very interested to hear those numbers!
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  #5  
Old 03-03-2015, 04:13 AM
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Relentless Relentless is offline
 
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Default Increased thrust static pull by 13-15% over 400

Quote:
Originally Posted by N54SG View Post
I'd be very interested to hear those numbers!
Update; The owner called me today in quite a good mood. Seems they have done pull tests with his plane to test props and engine combinations in the past and he claims he has never been able to pull more than 850 lbs with his 400. Sunday after some tweaking with the fuel map he said they could pull 950-980lbs constantly and ultimately broke needle on their 1000lb scale when it maxed out.

What you have to understand about the R409 is that it is not simply the increase in hp but the lower peak torque that makes the Titan R409 pull so hard in the rpm's we operate.
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  #6  
Old 03-03-2015, 05:35 AM
PaigeHoffart PaigeHoffart is offline
 
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Default Bank injection?

If I understand EFII correctly, it uses bank injection instead of sequential injection. Is there any way to balance the fuel distribution between the injectors?

Thanks,
Paige
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  #7  
Old 03-03-2015, 06:07 AM
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Relentless Relentless is offline
 
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Quote:
Originally Posted by PaigeHoffart View Post
If I understand EFII correctly, it uses bank injection instead of sequential injection. Is there any way to balance the fuel distribution between the injectors?

Thanks,
Paige
\
I am going to let Robert answer that question. My cylinders are very closely balanced with EFii but honestly I don't know how they even out so much with a batch fire system. Robert told me sequetial was too expensive and not necessary for our applications?
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  #8  
Old 03-03-2015, 11:31 AM
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rcpaisley rcpaisley is offline
 
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Default EFII

With electronic injection, the fuel delivery is equal to all cylinders by definition.
Each intake pipe has it's own injector with it's own fuel supply.
The fuel balance between cylinders with the EFII injection is light years ahead of mechanical alternatives. You can flow balance mechanical injection systems pretty well at one operating point, typically max power. But the flow balance falls apart as the power level is decreased, and is really bad at very low power, idle, and starting conditions. This is never the case with the electronic injection.

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  #9  
Old 03-03-2015, 03:48 PM
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Quote:
Originally Posted by Relentless View Post
What you have to understand about the R409 is that it is not simply the increase in hp but the lower peak torque that makes the Titan R409 pull so hard in the rpm's we operate.
Horsepower (the ability to do work) = (torque x RPM)/5252, so it is difficult to understand how lower peak torque results in more thrust.

Quote:
Originally Posted by rcpaisley View Post
With electronic injection, the fuel delivery is equal to all cylinders by definition.
Each injector assembly is supplied at the same pressure, and they are (in this batch fire system) opened and closed with the same electrical signal. However, that does not mean they deliver the same fuel quantity. In the end analysis, an electronic injector is still just a body with a hole in the end. Unless a vendor runs a great many injectors on a test bench in order to assemble a flow-matched set, the match is dependent on the manufacturer's flow tolerance. Plus or minus 6% (a 12% range) is a common specification, brand new, although the typical random set will be better. How much better does it need to be? Assume 8 GPH. A good GAMI spread has all cylinders passing peak EGT within a 0.2 GPH window, so 0.2/8 = 2.5% range.

With use, an electromagnetic injector is subject to dirt and deposit issues, as is a mechanical system's nozzle. 'Nuff said.

Let's assume you get a perfectly matched set, and they never get dirty. Will all cylinders reach peak EGT at the same time? Probably not. Identical fuel/air ratios for all cylinders is also dependent on air delivery. Again, unless somebody took great care to flow match cylinder heads, air delivery may or may not be identical.

The SDS controller has a rich/lean panel control knob. It works pretty much like the familiar red handle, but with less range. With it, an Efii owner should be able to determine a GAMI spread, just like with a mechanical injection. Some installations will be good out of the box, and some won't. If poor, you'll need to swap injectors, just as we do with nozzle restrictors.
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  #10  
Old 03-03-2015, 03:59 PM
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Dan Langhout Dan Langhout is offline
 
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Default

Quote:
Originally Posted by DanH View Post
Horsepower (the ability to do work) = (torque x RPM)/5252, so it is difficult to understand how lower peak torque results in more thrust.
I suspect he means peak torque occurs at a lower RPM.
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