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  #1  
Old 01-29-2017, 11:11 AM
PilotjohnS PilotjohnS is offline
 
Join Date: Jan 2016
Location: Southwest
Posts: 2,320
Default Swift 94ul fuel

Simple question for the engine experts, I am planning for a IO-320E2D in my 9a but modified for 9.0 to 1 pistons. Can I run the unleaded Swift 94ul in this engine, or do I need to wait for the 100 octane replacement before switching to unleaded fuel?
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  #2  
Old 01-29-2017, 11:48 AM
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JohnInReno JohnInReno is offline
 
Join Date: Jun 2005
Location: Prescott Valley/Chandler AZ
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Default Engine builder

Quote:
Originally Posted by PilotjohnS View Post
Simple question for the engine experts, I am planning for a IO-320E2D in my 9a but modified for 9.0 to 1 pistons. Can I run the unleaded Swift 94ul in this engine, or do I need to wait for the 100 octane replacement before switching to unleaded fuel?
I'm not one of the engine experts, but compression is only one element to consider. You also need to know ignition type and timing.
Good choice on the IO-320 for a 9A. I am very happy with 8.5 to 1, Pmags, and a Whirlwind C/S prop on my 1107lb 9A.
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  #3  
Old 01-29-2017, 12:49 PM
moosepileit moosepileit is offline
 
Join Date: Dec 2010
Location: Louisville, KY
Posts: 806
Default

I have that setup, 200 hrs in 3 yrs, not an expert. I use 50/50 90 octane "REC" mogas NO ethanol fuel with 100LL and so far so good with boroscopes, GRT EIS, Mags at 26 degrees and a carb that will flow 14 gph wide open standard day sea level.

I think if I jumped right into Swift I would set 25 degrees as my only change, for a ratio, probably start with about 30% 100LL. I'm not far from a pump, but have not sought it out. 90 REC at $2.70 is at my corner station and airport 100LL is $3.87. More than the false economy, my oil and plugs stay cleaner, longer. Knock on wood.

My concern is an 8.5:1 O-360 plane I had was placarded 91/96, E-274 TCDS for production 9:1 say 100 octane or 100LL for the H2AD.

I too wonder about Swift94, awaiting a reply from them. Both current 94 and the 102 in testing are mixable with 100LL according to their site FAQs.
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Last edited by moosepileit : 01-29-2017 at 01:48 PM.
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  #4  
Old 01-29-2017, 02:08 PM
PilotjohnS PilotjohnS is offline
 
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Location: Southwest
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Default Mixing fuel

Rich,
From what i understand of fuels, mixing 50/50 100LL and 90 should bring the octane to right about 97 because it is not a simple average. And seeing your other 9:1 is placard at 100LL sounds like 94UL maybe only good for 8.5:1. Maybe if i do decide to run 9:1 i will stick with 100LL or 100 UL when it becomes available. Thanks for the data.
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WARNING! Information presented in this post is my opinion. All users of info have sole responsibility for determining accuracy or suitability for their use.

Dues paid 2022, worth every penny

RV9A- Status:
98% done, 2% left to go
Structure done (less gear)
Electrical/Panel done
Firewall Forward 95% done
Fiberglass 90%
www.pilotjohnsrv9.blogspot.com
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  #5  
Old 01-29-2017, 06:31 PM
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Ed_Wischmeyer Ed_Wischmeyer is offline
 
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Location: Savannah, GA
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Default

Check the power gain with extra compression -- not that much. Might not be worth it with new fuels coming.

Ed
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  #6  
Old 01-29-2017, 09:37 PM
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RV10inOz RV10inOz is offline
 
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Location: Brisbane Qld. Aust.
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Don't worry about it.

You will be able to get 100LL or a suitable unload 100LL replacement. My bet is it will be G100UL.

I have some inside knowledge that makes me feel confident you will be OK, but not the SWIFT 94 I reckon.
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  #7  
Old 01-30-2017, 06:46 AM
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rv6ejguy rv6ejguy is offline
 
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Location: Calgary, Canada
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Let's remember that lots of folks have been flying on 91 Mogas with around 8.5 to 1 CRs for many years and thousands of hours with no issues. 94 would give you even more freedom with CRs and ignition timing using programmable EIs.
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Turbo Subaru EJ22, SDS EFI, Marcotte M-300, IVO, Shorai- RV6A C-GVZX flying from CYBW since 2003- 457.6 hrs. on the Hobbs,
RV10 95% built- Sold 2016
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  #8  
Old 01-30-2017, 07:08 AM
Mitch757 Mitch757 is offline
 
Join Date: Aug 2005
Location: Falmouth, MA
Posts: 384
Default Swift 94UL

We have just added Swift 94UL avgas at our airport, Falmouth Airpark. The octane ratings mentioned are by two different methods.

Our 94UL avgas is rated at 94 octane by the motor octane rating method (conservative numbers).

The signs provided to us for our pumps also show a "mogas" rating of 98 octane (r + m/2, the average of research and motor methods of determining octane rating).

Currently our selling price is about 15 cents/gallon less than 100LL.

Check the Swift Fuels web site for more info.

Mitch
RV12 now alcohol free!
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  #9  
Old 01-30-2017, 07:51 AM
brad walton brad walton is offline
 
Join Date: Jul 2007
Location: Cypress, TX
Posts: 538
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I have 9:1 pistons in my Superior IO 360 which Superior claims raises the hp from 180 to 185 hp. So not much extra power. Main benefit is it can run leaner than the lower compression engine. Supposedly down to .39 GAL. BSFC.
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  #10  
Old 01-30-2017, 07:55 AM
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rv6ejguy rv6ejguy is offline
 
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Quote:
Originally Posted by brad walton View Post
I have 9:1 pistons in my Superior IO 360 which Superior claims raises the hp from 180 to 185 hp. So not much extra power. Main benefit is it can run leaner than the lower compression engine. Supposedly down to .39 GAL. BSFC.
You probably can't run leaner but the thermal efficiency is slightly better with the higher CR.
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Turbo Subaru EJ22, SDS EFI, Marcotte M-300, IVO, Shorai- RV6A C-GVZX flying from CYBW since 2003- 457.6 hrs. on the Hobbs,
RV10 95% built- Sold 2016
http://www.sdsefi.com/aircraft.html
https://www.youtube.com/channel/UCiy...g2GvQfelECCGoQ


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