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03-10-2019, 08:59 PM
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Join Date: Oct 2009
Location: lena, il.
Posts: 305
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Xp 400
Does any one know the part number for the crank shaft used in the xp 400
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03-10-2019, 09:48 PM
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Join Date: May 2017
Location: Santa Rosa
Posts: 4
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Thanks for the info. I have worked with Scott Hayes at Superior who says their cold air system will fit on the Lycoming 390. I have worked with Jeff S. at Lycoming to get a "long block" Lyc 390 to replace my XP-400. Superior will allow me to keep all the bolt-on accessories at half their current price--cold air induction, fuel injection, oil filter adapter, starter, fuel pump and dual Light Speed ignitions. The XP-400 is such a close clone of the Lyc 390 that I used all the parts of the Van's FWF kit and Van's exhaust system on the XP-400 with very little modification. I don't know if the Lycoming 360 and 390 share the same case and oil sump.
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03-12-2019, 05:02 PM
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Join Date: Mar 2014
Location: Granbury, TX
Posts: 268
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I learned today from Jeff S that the Superior sump is NOT bolt-on compatible - there seems to be some confusion on this. I also learned that the Lycoming cold air induction sump is available on the 390 as the C3B6 engine (other internal changes in addition to the sump) and this engine is NOT available under Van?s pricing.
__________________
Keith Brown
RV-14A Builder - kit #136
N314KC - First flight Mar 8, 2017, 24th in the air, >600 hrs
XP-400 Aero Sport Power, replaced with Lyc Thunderbolt 390
RV-6A sold
Sport Pilot (weight-shift control) - Airborne XT912
Dues paid 9/2020
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03-12-2019, 07:48 PM
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Join Date: Aug 2012
Location: Greene, NY
Posts: 82
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While discussing options for the path forward with Barrett, I received the following correspondence from them. The list of items to be replaced in their proposal does not include the cold air sump so I assume they will be using the sump from the 400 and adapting it for use on the new engine. Not sure of the specifics either way but will be able to confirm when the new engine arrives (hopefully) around mid-may.
We can build your new engine with either an overhauled condition or new crankshaft. An IO-390 would be built with new Lycoming cylinder assemblies. An angle head 360 can be built with either new Lycoming or Superior cylinders, and your choice of stock compression or 10:1 compression pistons.
When your engine arrives here, we will disassemble the engine, NDT and perform dimensional inspection on the crankcases, cam, and all internal steel. We will modify the crankcases for the 390 cylinders if that is your engine selection. We will dynamically balance the replacement crankshaft, paint the engine and will reassemble the engine with the appropriate cylinders After assembly, we will test the engine for a minimum of 1.5 hours, just as we would a new engine.
We will replace the following parts: crankshaft, connecting rods, cylinders, pistons, pins, main and rod bearings, ct?wt retaining rings and plates, all gear attaching bolts, all locking devices, mag drive cushions, intake hoses, drainback hoses, oil pressure relief spring, silicone rocker box cover gaskets, and oil filters. We will install your accessories for use with the engine. The benefit of doing this is that this will ensure the current geometry of your engine so there is no question about exhaust/baffles fitting and you retain your new cases with roller tappet cam/lifters.
__________________
Chris Engler, Greene, NY
RV 8 Completed and Flying (N184CE), Showplanes Fastback and Cowl, Barrett IO-360; Dual GRT 10.4 HXr
Kitfox 7; Rotax 914, Built and Sold
VAF donation gladly paid through January 2021
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03-13-2019, 11:39 AM
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Join Date: Aug 2007
Location: Ontario, Canada
Posts: 2,291
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Just a quick comment here from the "less is more" department...
As many here know, the Glasair Sportsman has had the IO-390 as its most popular engine selection since that engine was first made available to Sportsman builders. Everybody seems to like the extra power it provides, especially those who operate on amphibs and floats and those who have opted for the additional 200lbs of gross weight that comes with the Carbon Sportsman.
In contrast to the above, our standard Sportsman is equipped with a carb'd O-360 with standard 8.5:1 compression, rated at 180hp. We operate on trike gear. I can't for the life of me justify more power in this aircraft. It's reasonably fast, economical, reliable, and can burn mogas, an important consideration in controlling direct operating costs, especially where avgas is difficult to find.
While it's always a no-brainer decision to install more horsepower, for aircraft that are already reasonably sprightly, sometimes adding more power just doesn't make sense when "total performance" is kept in mind. As has been pointed out previously in this thread, a weight loss program (aircraft and crew) would potentially bring a much better long-term return on investment than the purchase of more horsepower.
I really feel for those who are going through this engine buy-back, especially just as the first faint hope of spring is appearing over the horizon. Best of luck in whichever path you choose.
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03-15-2019, 05:26 PM
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Join Date: Mar 2014
Location: Granbury, TX
Posts: 268
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Lycoming Cold Air Sump
I?ve done all the searches and can?t find an answer. Lycoming offers a 390 with cold air induction - C3B6 model rated at 215 HP (available on the Cirrus SR20 for example). Vans does not offer this (must be A3B6) and I suspect this is because the Lycoming cold air induction sump (like the Superior XP-400 sump) is lower and would interfere with the crossover exhaust (4 in 1) designed for the RV14. However, for my Superior XP400, I substituted a Vetterman trombone system (2x 2-in-1) which does not cross under the sump. Has anyone installed or investigated the C3B6 IO-390 (Thunderbolt, non-certified) engine for an RV-14? I realize I would face changes in cables (throttle and maybe mixture) but I?m more concerned with intake and exhaust pipe spacing and clearing the sump itself.
__________________
Keith Brown
RV-14A Builder - kit #136
N314KC - First flight Mar 8, 2017, 24th in the air, >600 hrs
XP-400 Aero Sport Power, replaced with Lyc Thunderbolt 390
RV-6A sold
Sport Pilot (weight-shift control) - Airborne XT912
Dues paid 9/2020
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