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  #1  
Old 11-25-2011, 04:55 PM
vmirv8bldr's Avatar
vmirv8bldr vmirv8bldr is offline
 
Join Date: Jun 2005
Location: Eastvale, CA
Posts: 378
Default Need help with SJ cowl!!!

I need some assistance from anyone who has an SJ cowl on their 8. Specifically, Measurements along the cut line from FW to inlet on both sides. If you happen to have a Whirlwind RV200 and a Barrett IO-390, you're my new best friend.

Long story short, after getting the horizontal hinges installed on the bottom cowl, I put it on the plane and the hinge eyes are in contact with the valve cover on Cyl #2, front LEFT. Cyl #1 (front RIGHT) has about 1/4" clearance. Theoretically, Cyl #1 should be the tightest fit since it is the forward-most cylinder.

Obviously, this cowl is unusable but I need to figure out what caused this before starting over. Any ideas?

Details:
RV-8
Barrett IO-390
Whirlwind 200RV (CS) prop and spinner
Sabre 2.5" Prop extension

Thanks,
Bart
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Bart Filipiak
Eastvale, CA
RV-8 N74VB

Barrett IO-390
WW200RV
FLYING!!!!!!!
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  #2  
Old 11-26-2011, 10:06 PM
vmirv8bldr's Avatar
vmirv8bldr vmirv8bldr is offline
 
Join Date: Jun 2005
Location: Eastvale, CA
Posts: 378
Default Pictures

This may help explain what I'm seeing...

I checked my engine mount at the fuselage and it is symmetrical and centered. All bolts are torqued. 2.5" prop extension is installed as required by the SJ cowl for the RV-8.







In the pic below, I used a long level to extend the fuselage forward to the engine and then measured these values from the edge of the level to the center of the valve cover of each cylinder.






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Bart Filipiak
Eastvale, CA
RV-8 N74VB

Barrett IO-390
WW200RV
FLYING!!!!!!!
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  #3  
Old 11-27-2011, 05:03 PM
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Bruce Bruce is offline
 
Join Date: Feb 2006
Location: Anywhere, USA
Posts: 1,146
Default

Bart,

Do you have pics from the front of the cowl around the spinner.
I would like to see the spacing there.

With some help just remove cleco's on the long side and push
back a 1/2 inch or so.
I thought I had the same problem with mine and adjusted more
after I had the spinner side gap perfect.

Thanks and I hope it helps.
Boomer
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Kathy (KAT) Pauley

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  #4  
Old 11-27-2011, 07:42 PM
koda2 koda2 is offline
 
Join Date: Mar 2007
Location: West Texas
Posts: 285
Default engine mount

Bart,
I am no expert but my first impression is that your engine mount is not only canted right side down but is also pointed to the right of center. I would get some measurements of the mount itself and compare it to some others.

It would also seem impossible for the engine mount to be made improperly or bent but I had some weldments that were simply not acceptable in my kit. I threw away the copilot stick base and had to totally redo the landing gear mounts.

It would also be very unlikely that the firewall installation is crooked but,... is that possible?

Double check your engine mounts to make sure one side is not reversed on the top or bottom.

Don't throw away the cowl; I know one builder who had his engine/mount on improperly, fitted the cowl, corrected the mount problem, and had to rebuild the cowl. It was accomplished with not to much difficulty.

Dave A.
6A build
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  #5  
Old 11-27-2011, 08:22 PM
vmirv8bldr's Avatar
vmirv8bldr vmirv8bldr is offline
 
Join Date: Jun 2005
Location: Eastvale, CA
Posts: 378
Default Engine cant

The engine on the 8 is supposed to be canted. The VS is put on perfectly straight and the engine is canted to overcome P-Factor. I originally thought about the mount, but with the firewall holes lining up pretty well and the back of the spinner centered, I believe it is right. I posted the pics to see if anyone else could verify theirs is about the same.

I also thought maybe the 390 jugs were slightly wider than the 360, but I understand they are identical. (Will confirm with Barrett tomorrow morning.)

I have a few ideas on making the cowl work. While I use a 1/4" spacer for fitting, it measures about 3/8th now, so I can fill and drill the rear of the cowl and pull one side out like Bruce mentioned. Someone else suggested placing a spacer and applying some heat, then letting it cool. I may also be able to remove some materials from the spinner holes and smash it down in the center to bow the sides out.

I'm still interested in confirmation of my engine mounting measurements and will call Van's in the morning also.

Keep the ides coming.

Bruce, as I said, spacing is about 3/8" back from the spinner and centered. Though centered actually leaves about 1/8 to 1/4 on the sides to play with.
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Bart Filipiak
Eastvale, CA
RV-8 N74VB

Barrett IO-390
WW200RV
FLYING!!!!!!!
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  #6  
Old 11-28-2011, 04:53 AM
Stretch Stretch is offline
 
Join Date: Jul 2009
Location: Melbourne, Victoria, Australia
Posts: 7
Default

A friend of mine put the engine bolts in the incorrect holes when mounting the engine in his 7. Caused misalignment of the motor with the cowl.
I am not quite at that stage myself yet but I have checked. I believe the 4 bolts that go through the Dynafocul mounts are 2 pairs of different lengths. Not much in it but I am told that if they're put in the wrong holes the motor can be canted up/down/sideways - depending which bolt is where........
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