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  #11  
Old 09-14-2011, 08:56 AM
gasman gasman is offline
 
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Quote:
Originally Posted by RetiredRacer View Post
Michel,

(note my above post)

I have one cylinder (#1) running a bit lean (high EGT's). In trying to pinpoint the problem, I believe it could be the TBI. By pulling the black knob back slightly, the EGT's stabilize. I'm figuring the slide slightly protruding is creating turbulence and thus mixing the fuel/air mixture better. Are you by any chance having anything similar?

I'll see what I can do to insert some installation photo's

Bob
Bob, look at this grid....... http://www.aircraftspruce.com/catalo...torheatbox.php
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  #12  
Old 09-14-2011, 08:57 AM
Clouddancer Clouddancer is offline
 
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Location: Switzerland
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Bob

I sent you a PM with my email if you agree to send me some pictures as well.

Thanks!
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RV-4 SN2416 in slow progress
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  #13  
Old 09-15-2011, 12:50 AM
Dragonfly Dragonfly is offline
 
Join Date: Jul 2009
Location: New Zealand
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Check out the price on the grid, thats pretty impressive.
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  #14  
Old 09-15-2011, 05:21 AM
RetiredRacer RetiredRacer is offline
 
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Location: Ipswich QLD Australia
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Quote:
Originally Posted by Dragonfly View Post
Check out the price on the grid, thats pretty impressive.
I have already ordered one of these thanks guys. But being down under it takes time.

Sent you an email Andreas.

Bob
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  #15  
Old 09-18-2011, 06:02 PM
joeboisselle joeboisselle is offline
 
Join Date: Jan 2006
Location: White Swan Wa.
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Got it together with a short ground run today. I didn't bring the camera, and it was blowing 20 knots across the runway so all I have so far is "it makes the propeller go 'round" There's a few of my homemade pieces that need fine tuning. Compared to setting up the marvel carb, this is really quite easy.
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  #16  
Old 09-20-2011, 02:33 PM
Clouddancer Clouddancer is offline
 
Join Date: Aug 2009
Location: Switzerland
Posts: 178
Default Pictures of Rotec TBI Installation on O-320

Michel was so kind to send me some pictures of his installation and agreed that I put them in the forum. A very neat and compact installation. Thanks alot Michel! ...perhaps somebody can comment on the high fuel consumption at full rich position?

"here,s few pics of my installation. it is on my RV4 C-GVFR. it has a 0-320-E2D with a snowline exhaust cross over. i had to make a bellcrank in order to transfer the motion lateraly as you can see. also i did manufacture a fitting to attache the regulator to the carb. it requier some homeimprovement thinking to adapt the TBI. the TBI do perfom quite well in all aspect of flight. my only concern is the fuel consumption wich is high in a full rich position. with a carburator under 5k ft i leave it ful and it suck 8.5 gal-hr at 2400 rpm but with the tbi is went up to 11 !!!!!!!. so by playing with the mixture i found a proper set where it should suck the same amount of gas. other than that i have rock the aircraft under soft aerobatic without any problem."







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  #17  
Old 09-20-2011, 03:37 PM
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rocketbob rocketbob is offline
 
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Quote:
Originally Posted by Clouddancer View Post
...perhaps somebody can comment on the high fuel consumption at full rich position?
Its hard to say without density altitude numbers. Rotec could make a different spray bar with fewer holes in it.
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N9187P PA-24-260B Comanche, flying
N678X F1 Rocket, under const.
N244BJ RV-6 "victim of SNF tornado" 1200+ hrs, rebuilding
N8155F C150 flying
N7925P PA-24-250 Comanche, restoring
Not a thing I own is stock.
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  #18  
Old 09-20-2011, 10:25 PM
gasman gasman is offline
 
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Quote:
Originally Posted by Clouddancer View Post
...perhaps somebody can comment on the high fuel consumption at full rich position?
I have the same unit sitting on the bench not installed yet. It looks like full rich is what you make it. Just like your linkage. If you know that your carb produced 8 gph full rich, then pull the knob till you get 8 gph under the same circumstances, mark that spot and make a stop for it.

RotecTBIlogo AD: 15th March 2010
EXTRA NOTES: 15-03-2010

* The full rich position should be set at a point which results in an 80 degree F drop from maximum EGT. This will almost certainly be at a lever position before the TBI rich full stop.



I am at sea level +89 ft.This is what I will do when I switch from carb to TBI.

BTW..... go to the Rotec site so you can understand what the primer button in the center of the regulator can do for you.

Last edited by gasman : 09-21-2011 at 10:53 AM. Reason: Added the BLUE
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  #19  
Old 09-21-2011, 08:22 AM
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rocketbob rocketbob is offline
 
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Since the stops are fixed via rollpin to the spray bar too much fuel in the full-rich position and adjusting accordingly will result in less travel between full rich and a full lean condition. I would think having the holes on the small side would be a bit better to start with since they could be enlarged with printed circuit board drills. Its easier to enlarge the holes in the spray bar and impossible to go the other way.
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Bob Japundza CFI A&PIA
N9187P PA-24-260B Comanche, flying
N678X F1 Rocket, under const.
N244BJ RV-6 "victim of SNF tornado" 1200+ hrs, rebuilding
N8155F C150 flying
N7925P PA-24-250 Comanche, restoring
Not a thing I own is stock.

Last edited by rocketbob : 09-21-2011 at 08:35 AM.
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  #20  
Old 09-21-2011, 10:07 AM
gasman gasman is offline
 
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Location: Sonoma County
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Quote:
Originally Posted by Clouddancer View Post
...perhaps somebody can comment on the high fuel consumption at full rich position?
Also, You might check to see that you have the correct model for your motor.
An O320 would use a model 40-4. An O360 would use a model 40-4/5.

You can tell by measuring the throw of the throttle plate.

O320 throw = 1.57 inches.

O360 throw = 1.89 inches.
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