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05-28-2020, 05:50 PM
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Join Date: Mar 2018
Location: Buena Park, California
Posts: 279
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Thanks for the link to the AD. I would have used one clamp if I didn't stumble this thread.
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RV8 standard build: Empennage 99% completed
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Firewall Forward -- New engine received !
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05-28-2020, 08:06 PM
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Join Date: Oct 2007
Location: Sacramento, CA
Posts: 3,351
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Looking at the second picture alone, how does the fuel line from the servo gets routed to the spider? Is this really running the fuel line from the back of the engine to the front and then routed all the way back thru the baffle?
Also, what are the baffle material on the firewall? I am wondering how the cowl gets fitted to the fuse. Then there is cold blasting tube from the baffle to the firewall which is not clear what it is for.
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Mehrdad
N825SM RV7A - IO360M1B - SOLD
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05-28-2020, 08:25 PM
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Join Date: Jan 2005
Location: SC
Posts: 12,887
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Quote:
Originally Posted by Bavafa
Looking at the second picture alone, how does the fuel line from the servo gets routed to the spider? Is this really running the fuel line from the back of the engine to the front and then routed all the way back thru the baffle?
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Yep, and it is laid on top of the cylinder.
Quote:
Originally Posted by Bavafa
Also, what are the baffle material on the firewall? I am wondering how the cowl gets fitted to the fuse. Then there is cold blasting tube from the baffle to the firewall which is not clear what it is for.
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IIRC, there were electronics up there that the builder was trying to protect.
Did you notice that the intercylinder baffles were on the top of the cylinders and not on the bottom. Not only that but one was laying on top of push tube? That alone could cause some serious issues.
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Bill R.
RV-9 (Yes, it's a dragon tail)
O-360 w/ dual P-mags
Build the plane you want, not the plane others want you to build!
SC86 - Easley, SC
www.repucci.com/bill/baf.html
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05-28-2020, 10:32 PM
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Join Date: Jan 2008
Location: Ashland, OR
Posts: 2,573
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Quote:
Originally Posted by N941WR
Adding a second set of adel clamps reduces vibration, thus reduces the chance of one of those lines cracking.
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In addition to the absence of the second Adel clamp, the routing of the fuel lines from the spider to the injectors is non-standard, and could easily cause issues. The standard routing is fairly direct to the injectors from the spider, running along the pushrods above the cylinders, but NOT running any where close to the cylinder heads. The extra length of those lines, just above the cylinder heads, will worsen the boiling of fuel in those lines after shutdown that makes hot starts 'difficult' as well as potentially cause vapor lock while the engine is running.
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Steve Smith
Aeronautical Engineer
RV-8 N825RV
IO-360 A1A
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05-28-2020, 10:37 PM
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Join Date: Jan 2008
Location: Ashland, OR
Posts: 2,573
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Quote:
Originally Posted by Taltruda
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One example of the positive and constructive impact of this thread is the identification of this AD. I was unaware of it. At this moment, I do not know for sure if my engine has two clamps or one on each fuel line from the spider to the injector. But I will certainly check the next time my cowl is off, so THANK YOU!
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Steve Smith
Aeronautical Engineer
RV-8 N825RV
IO-360 A1A
WW 200RV
"The Magic Carpet"
Hobbs 625
LS6-15/18W sailplane SOLD
bought my old LS6-A back!! 
VAF donation Jan 2020
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05-28-2020, 11:19 PM
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Join Date: Oct 2017
Location: Las Vegas, NV
Posts: 407
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Quote:
Originally Posted by scsmith
One example of the positive and constructive impact of this thread is the identification of this AD. I was unaware of it. At this moment, I do not know for sure if my engine has two clamps or one on each fuel line from the spider to the injector. But I will certainly check the next time my cowl is off, so THANK YOU!
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You?re welcome! Your A&P should run ADs on your engine and provided you with this.. pretty basic stuff, but it gets almost overwhelming with all the information out there! Also to point out, it may be due to an over abundance of caution on their part, but in the AD, (Or was it the SB) it says that if only one clamp is found (or no clamps) to replace the fuel line. I imagine because they can?t determine how much fatigue the line endured while operating unsupported..
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Tom
Las Vegas
RV-8 empenage almost finished
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05-29-2020, 12:03 AM
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Join Date: Jan 2008
Location: Ashland, OR
Posts: 2,573
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Quote:
Originally Posted by Taltruda
You?re welcome! Your A&P should run ADs on your engine and provided you with this.. pretty basic stuff, but it gets almost overwhelming with all the information out there! Also to point out, it may be due to an over abundance of caution on their part, but in the AD, (Or was it the SB) it says that if only one clamp is found (or no clamps) to replace the fuel line. I imagine because they can?t determine how much fatigue the line endured while operating unsupported..
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Well, I hold the repairman's cert. so no A&P. I checked all the AD's at the time of engine install, but I confess I do not routinely look to see if new ones are out. In this case the SB is a revision to a previous one, and I expect my engine was brought to compliance with the older version when it was overhauled to certificated standards. But I will check.
As it happens, diagram 4 of the SB which applies to my engine, shows just one clamp on the right side cylinders, and two clamps for the left side, one of the clamps being on an L bracket to a case bolt. So I will check to see if I have those.
__________________
Steve Smith
Aeronautical Engineer
RV-8 N825RV
IO-360 A1A
WW 200RV
"The Magic Carpet"
Hobbs 625
LS6-15/18W sailplane SOLD
bought my old LS6-A back!! 
VAF donation Jan 2020
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