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Since this regulator is apparently not referenced to manifold pressure, it would be interesting to know if it is referenced to atmospheric pressure or some internal reference.
If it is referenced to atmospheric, tuning with Tracy's controller with appropriately sized injectors would most likely be effective at a given altitude without doing anything special. Since the fuel pressure across the injectors would change with altitude,
the mixture would change with altitude also. Most likely, adjusting the manual mixture control would compensate for this. For me, at least, this would not be of particular concern since I tweak the manual mixture control when settling into a cruise condition
anyway.
If using an injector pulse based fuel flow rate / fuel remaining instrument, it may be even more important to operate under the same conditions as those used to develop its calibration since the altitude of operation would introduce another variable. Evaluation
of the installation under different operating conditions would be required to determine whether or not this could cause errors large enough to be of concern.
Steve Boese
RV6A, 1986 13B NA, RD1A, EC2
From: Rotary motors in aircraft [flyrotary@lancaironline.net] on behalf of Tracy [rwstracy@gmail.com]
Sent: Wednesday, May 22, 2013 9:11 AM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: combo fuel pressure regulator/filter option?
Depends on the size and type of injectors used. Would probably work ok with the red ( low flow rate ) Renesis injectors in the primaries. Stock NA 2nd gen, maybe, larger 550 cc Turbo injectors- probably not.
Tracy
Sent from my iPad
Good point. I wonder how the Corvette ECU handles it, & whether Tracy's ECU can be tuned to compensate.
Charlie
On 05/21/2013 11:11 PM, Bill Bradburry wrote:
Charlie,
You may want your pressure regulator to follow your manifold pressure. This would be especially useful at idle if you were set at 58
lbs. Injectors are flow rated at about 43.5 lbs, so at 58 they would put out more fuel than they were rated for, which could make getting your idle set correctly a problem. Or maybe not??
Bill B
From:
Rotary motors in aircraft [mailto:flyrotary@lancaironline.net]
On Behalf Of Charlie England
Sent: Tuesday, May 21, 2013 8:18 PM
To: Rotary motors in aircraft
Subject: [FlyRotary] combo fuel pressure regulator/filter option?
Anyone seen one of these?
http://www.gmpartsdirect.com/results.cfm?addtocart=1&addpartnumber=19239926&singlepart=1&partnumber=19239926
(Other sites have pics; this was just the lowest price I saw with a quick search.)
I just saw it in a car magazine about an LS motor installation. Apparently, the pressure is set at ~58 lbs, but that's the approximate set point for RX-8 cars, right? I've already set up my dual fuel pumps, dual GM filters as used by Ed A, and an aftermarket
'hot rod' adjustable regulator, but this device looks attractive. The weight savings (& money savings) seem to make it an attractive option.The only downside that's immediately comes to mind is whether the entire assembly must be replaced to change the filter.
Charlie
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