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  #1  
Old 07-24-2023, 08:57 AM
Condor Condor is offline
 
Join Date: Oct 2016
Location: Dublin Ireland
Posts: 12
Default Alternator blast tube

Iíve built my RV14 as per the plans firewall forward which means that I have the vent fitted on the right hand forward inlet ramp to direct air to the heater muffs on the exhaust. This is standard for the non EXP119 IO-390.

I havenít fitted a cooling blast tube for the Plane Power alternator and wondering if I should modify the inlet ramp to accept a second takeoff point for a blast tube.

What have others done? Iíve only 20 hours on the aircraft at this stage and hoping for a reasonable lifespan for the alternator.

Thanks in anticipation for any replies.

Ian
RV14A EI-XIV.
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  #2  
Old 07-24-2023, 09:16 AM
AlpineYoda AlpineYoda is offline
 
Join Date: Nov 2019
Location: Boulder, CO
Posts: 500
Default

I did exactly that on my RV-10. I forget if it was in the plans or not, but keeping the alternator cool seemed logical to me.
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  #3  
Old 07-24-2023, 09:28 AM
PilotjohnS PilotjohnS is offline
 
Join Date: Jan 2016
Location: Southwest, USA
Posts: 2,895
Default Blast tube +

Besides adding a blast tube, I added a heat shield so the red hot exhaust pipe is not "seen" by the alternator. In my mind, this may be more critical for long life.
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  #4  
Old 07-24-2023, 09:48 AM
Condor Condor is offline
 
Join Date: Oct 2016
Location: Dublin Ireland
Posts: 12
Default

I know this subject was covered several times including a year ago when James Hartline asked the same question but Iím looking for the latest info and thoughts on whether or not a blast tube is actually needed. Also is there any relevant temperature information available on the RV14 installation.
Thanks
Ian.
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  #5  
Old 07-24-2023, 03:23 PM
Bavafa Bavafa is offline
 
Join Date: Oct 2007
Location: Sacramento, CA
Posts: 4,482
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I have had a 3/4" blast tube to the alternator on all three planes and consider this standard for me. I have never had any issues with the alternator on any of the three planes.
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  #6  
Old 07-24-2023, 10:23 PM
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rv8ch rv8ch is offline
 
Join Date: Feb 2005
Location: LSGY
Posts: 5,377
Default

Quote:
Originally Posted by Condor View Post
I know this subject was covered several times including a year ago when James Hartline asked the same question but Iím looking for the latest info and thoughts on whether or not a blast tube is actually needed. Also is there any relevant temperature information available on the RV14 installation.
Thanks
Ian.
Hi Ian, just this weekend several people commented that I don't have an alternator cooling blast tube on my RV-8. I didn't give it a lot of thought, but recall seeing some saying it was required, and some saying it was not needed. I guess I took the easy path. My normal alternator load is about 9-12 amps, so perhaps I'm not working it very hard. So far about 250 hours on my Hartzell/PP alternator. I hope I didn't jinx it!
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  #7  
Old 07-25-2023, 01:25 AM
Condor Condor is offline
 
Join Date: Oct 2016
Location: Dublin Ireland
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Hi Ian, just this weekend several people commented that I don't have an alternator cooling blast tube on my RV-8. I didn't give it a lot of thought, but recall seeing some saying it was required, and some saying it was not needed. I guess I took the easy path. My normal alternator load is about 9-12 amps, so perhaps I'm not working it very hard. So far about 250 hours on my Hartzell/PP alternator. I hope I didn't jinx it!
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My alternator load is about the same and Iíve made sure the drive belt is not too tight. I did see a post referring to a better spec on the later PP alternator since Hartzell took over but this could be an urban myth!
Ian.
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  #8  
Old 07-25-2023, 05:59 AM
lr172 lr172 is offline
 
Join Date: Oct 2013
Location: Schaumburg, IL
Posts: 8,873
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No blast tubes on either of my planes. 900 hours on the $35 ND alt and keeps on chugging along. Key to longevity is buying the right alt. Pp alt is not on that list for me anyway. I also prefer externally regulated to keep temps low on the electronics

Larry
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  #9  
Old 07-25-2023, 06:22 AM
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rv8ch rv8ch is offline
 
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Location: LSGY
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Quote:
Originally Posted by lr172 View Post
No blast tubes on either of my planes. 900 hours on the $35 ND alt and keeps on chugging along. Key to longevity is buying the right alt. Pp alt is not on that list for me anyway. I also prefer externally regulated to keep temps low on the electronics

Larry
Sorry for the thread hijack, but do you buy ND alternators that already support external VR or do you do surgery on it yourself?
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  #10  
Old 07-25-2023, 07:19 AM
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Toobuilder Toobuilder is offline
 
Join Date: Jul 2009
Location: Mojave
Posts: 5,190
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Quote:
Originally Posted by lr172 View Post
No blast tubes on either of my planes. 900 hours on the $35 ND alt and keeps on chugging along. Key to longevity is buying the right alt. Pp alt is not on that list for me anyway. I also prefer externally regulated to keep temps low on the electronics

Larry
Same here. ND from NAPA auto parts and modified for the B&C external regulator. With EFI, I cruise at 25+ amps. No external cooling.

Flew into Vegas last night and OAT on downwind was 102 degrees at 1945 hrs

No issues in 400 hours on this alternator system
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