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07-02-2014, 01:52 PM
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Join Date: Feb 2011
Location: Germany
Posts: 443
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Will you also do tests with different ignition systems? P-Mags? Would be interested in the differences vibrationwise.
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RV-7 flying, IO-375 w. P-Mags, 200RV Prop
RV-8 flying, IO-375, P-Mags, 74RV Prop
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07-02-2014, 09:30 PM
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Join Date: Feb 2005
Posts: 592
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Not meaning to be obnoxious but I thought the 409 was supposed to put out 230 hp or am I mistaken?
Glenn Wilkinson
__________________
_____________________________________________
RV-4 Sold
N654RV @ MLJ
RV-7 Coming Soon
N987RV Reserved
2015 Donation Gladly Paid
"Maintain Thy Airspeed, Lest the Earth Arise and Smite Thee"
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07-02-2014, 10:10 PM
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Join Date: Aug 2005
Location: Pasadena CA
Posts: 2,484
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I was kinda surprised by the low number there too, is the 409 Parallel or Angle valve?
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Stephen Samuelian, CFII, A&P IA, CTO
RV4 wing in Jig @ KPOC
RV7 emp built
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07-02-2014, 10:16 PM
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Join Date: Dec 2005
Location: Sydney, Australia
Posts: 427
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Quote:
Originally Posted by Relentless
Mojo,
I can tell you the the difference between the 194hp 370 and 212 hp 409 was dramatic on climbout. I hope the couterweighted 370 will perform better.
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I am confused by this comment, did you mean difference in vibration or something else?
Great job undertaking these tests, like others have said Hartzell would be very remiss if they passed over the opportunity. The strength of the team is much greater than the sum of the individuals.
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Doug Gray
RV-6 completed, flying since July 2010
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07-05-2014, 06:40 AM
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Join Date: Aug 2010
Location: San Luis Obispo
Posts: 199
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Quote:
Originally Posted by glenn654
Not meaning to be obnoxious but I thought the 409 was supposed to put out 230 hp or am I mistaken?
Glenn Wilkinson
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We now have 3 versions of the 409, a standard parallel which puts out 210hp and 410lbs of torque, an angle valve version which is 230hp and 450lbs of torque, and the RSeries 409 which developes 230hp and 450lbs of torque but weights in under 300 lbs.
As a comparison we tested a ycoming 390 off one of the Aerodynamix RVs and it made a disappointing 205hp......not the advertised 215hp....
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07-05-2014, 06:45 AM
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Join Date: Aug 2010
Location: San Luis Obispo
Posts: 199
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Quote:
Originally Posted by Doug
I am confused by this comment, did you mean difference in vibration or something else?
Great job undertaking these tests, like others have said Hartzell would be very remiss if they passed over the opportunity. The strength of the team is much greater than the sum of the individuals.
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The difference was the feeling in the seat of you're pants, everyone likes to talk about hp but what I will show the world very soon is how much better our stroker engines perform because of the torque they produce at around 2500 rpm.
Hartzell did testing on our engines back in 2009, I will be inviting them to test again once we finish Oshkosh.
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07-05-2014, 07:06 AM
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Join Date: Sep 2007
Location: Central IL
Posts: 5,516
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Quote:
Originally Posted by Relentless
We now have 3 versions of the 409, a standard parallel which puts out 210hp and 410lbs of torque, an angle valve version which is 230hp and 450lbs of torque, and the RSeries 409 which developes 230hp and 450lbs of torque but weights in under 300 lbs.
As a comparison we tested a ycoming 390 off one of the Aerodynamix RVs and it made a disappointing 205hp......not the advertised 215hp....
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That (lower speed) torque advantage will really show in cruise settings! Lots of good pireps expected from that.
A curious question, what oil viscosity and temperature do you use for the standard power testing?
Also with the higher Cubes, how do you improve the breathing to get the air to go with fuel? No secrets, just generally.
Thanks for being here BTW- it is great having some direct contact with engine builders!
__________________
Bill
RV-7
Lord Kelvin:
“I often say that when you can measure what you are speaking about,
and express it in numbers, you know something about it; but when you
cannot measure it, when you cannot express it in numbers, your knowledge
is of a meager and unsatisfactory kind.”
Last edited by BillL : 07-05-2014 at 07:09 AM.
Reason: clairifcation
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07-05-2014, 09:03 AM
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Join Date: Feb 2006
Location: George West, TX
Posts: 567
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Thank you and your crew.
I really appreciate what you all are doing and keeping us informed. One of these days I want to upgrade; and the Titan 340 is heading up my daydreams.
Best in your endeavors. 
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Deal Fair
RV-4 (N34CB)
George West, TX (8T6)
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07-05-2014, 09:15 AM
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Join Date: Oct 2005
Location: 08A
Posts: 9,500
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Quote:
Originally Posted by Relentless
As a comparison we tested a ycoming 390 off one of the Aerodynamix RVs and it made a disappointing 205hp......not the advertised 215hp....
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Well, in fairness, they've always been advertised at 210.
http://www.lycoming.com/Lycoming/PRO...ngineData.aspx
And Titan literature advertises 205 for the base parallel valve 409, with 10.5 CR. The low weight is attractive. Does it have pendulum absorbers?
http://www.titanengine.com/wp-conten...n_041614-3.pdf
FWIW, my 390 did 205 on the Barrett dyno with just over 1 hour on the clock, and it has loosened up quite a bit since then. Dead stock kit motor (8.9 CR, Airflow, Slicks) with balancing, back when you could still buy a kit motor.
Kevin, how many hours on the A-Team 390? I know of a well-flogged acro 580 in for overhaul, so maybe we'll soon have some wear data for the big bore cylinder.
__________________
Dan Horton
RV-8 SS
Barrett IO-390
Last edited by DanH : 07-05-2014 at 09:33 AM.
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