Tachometer Readings Post your tachometer readings for your motor in here or ask others what they are getting out of their motor/prop combos!

New HP Benchmark For a N/A Saito FA180

Reply
Old 11-14-2012, 05:41 PM
  #1
SrTelemaster150
Thread Starter
 
SrTelemaster150's Avatar
 
Join Date: Feb 2012
Location: Brasher Falls, NY
Posts: 3,541
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default New HP Benchmark For a N/A Saito FA180

Sato FA180 12.77:1 Compression ratio via .035" case deck reduction. C&H Electronic Ignition, Saito 220 Big Bore Carburetor 12mm bore, 180 intake manifold ported to 12mm on the updraft. O'Donnell Speed Blend glow fuel 30% nitro/8% lube.

8850 RPM W/Dynathrust 18x8 prop 23.21# static thrust, 3.95HP.
SrTelemaster150 is online now  
Reply With Quote
Old 11-14-2012, 05:45 PM
  #2
SrTelemaster150
Thread Starter
 
SrTelemaster150's Avatar
 
Join Date: Feb 2012
Location: Brasher Falls, NY
Posts: 3,541
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: New HP Benchmark For a N/A Saito FA180

Delete double post
SrTelemaster150 is online now  
Reply With Quote
Old 11-14-2012, 05:54 PM
  #3
eddieC
 
eddieC's Avatar
 
Join Date: Nov 2002
Location: Jackson, MI
Posts: 2,102
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: New HP Benchmark For a N/A Saito FA180

Damn!
eddieC is offline  
Reply With Quote
Old 11-14-2012, 06:53 PM
  #4
SrTelemaster150
Thread Starter
 
SrTelemaster150's Avatar
 
Join Date: Feb 2012
Location: Brasher Falls, NY
Posts: 3,541
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: New HP Benchmark For a N/A Saito FA180

Quote:
ORIGINAL: eddieC

Damn!

You can get some background about the engine in [link=http://www.rcuniverse.com/forum/m_11295528/tm.htm]THIS THREAD.[/link]
SrTelemaster150 is online now  
Reply With Quote
Old 11-15-2012, 01:43 PM
  #5
airraptor
 
Join Date: Jan 2004
Location: fairfield, CA
Posts: 4,083
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: New HP Benchmark For a N/A Saito FA180

What did it spin that prop before that?
airraptor is offline  
Reply With Quote
Old 11-15-2012, 02:23 PM
  #6
SrTelemaster150
Thread Starter
 
SrTelemaster150's Avatar
 
Join Date: Feb 2012
Location: Brasher Falls, NY
Posts: 3,541
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: New HP Benchmark For a N/A Saito FA180

Quote:
ORIGINAL: airraptor

What did it spin that prop before that?
There are RPM readings for the variuos configuartion of the engine tested W/15% Cool Power glow fuel listed below. They include RPM readings for a standard compression ratio FA180 W/glow ignition, a standard compression FA180 W/CDI & the high compression FA180 W/CDI & the FA220 "Big Bore" carburetor.


Quote:
ORIGINAL: SrTelemaster150

I finally got an ideal day for testing the power output differences for my Standard compression Saito FA180 on glow ignition, the standard compression FA180 W/CDI & the High Compression FA180HC CDI BBC (FA220 Big Bore Carburetor) All testing W/the same 15% Cool Power glow fuel

For those not familiar W/the high compression FA180HC project, an illustrated write up is available [link=http://www.rcgroups.com/forums/showthread.php?t=1754616]HERE.[/link]

Since the FA180HC BBC was on the test stand I double checked the ignition timing. The timing was set @ 34* BTDC. That will give 34* BTDC @ WOT when running @ high RPM. I'm not sure what the advance curve is, but the 24* retard @ start would give 10* BTD ignition timing @ start & idle.

The 220 Big Bore carburetor has the same bolt pattern as the 150/180 carburetors, it is 12mm bore (the 180 carb is 11mm. the 150 10mm) I bored the updraft portion of the FA150 manifold I had on hand out to 12mm. The horizontal runner where the manifold interfaces W/the intake port was bored out to the standard FA180 ID to match the 180 intake port.

Interesting note: The aluminum intake gaskets that come W/the FA180 are smaller in I D than either the intake manifold or the port on the cylinder head. It appears to be the same ID as the 150 port/manifold. Since I have not had any issues eliminating these gaskets on any of my 150/180 engines, I chose to eliminate it for a smoother transition from the manifold to the intake port.

After fiddling W/the HSN, the FA180HCCDI BBC spun the Dynathrust 18x8 prop @ a solid 8400 RPM flashing 8500, idle was steady 1100 RPM. @ 8450 RPM that generated 3.44HP W/20.44# Thrust.

The standard compression FA 180CDI had the timing checked & set @ the same 34* BTDC.

After tweaking the HSN, the FA180CDI spun the same 18x8 prop @ 8000 RPM flashing to 8100, idle was a steady 1200 RPM. @ 8050 RPM that generated 2.98HP W/18.55# Thrust

The CDI was unhooked, the sparkplug replaced W/a glow plug. The needle setting were opened up to OEM start up specs & the engine started on glow ignition.

After setting the HSN & LSN, the FA180 on glow ignition spun the 18X8 prop @ a steady 7900 RPM, the idle was a rough 1400 RPM but it was reliable. @ 7900 RPM that generated 2.81HP W/17.86# Thrust.

CDI ignition gave an additional 150 RPM, .17HP & .69# of thrust over glow ignition & reliable idle was was 200 RPM lower.

The compressionn ratio increase to 12.77:1 from the stock 9.56:1 coupled W/the 12mm FA220 Carb really brought on the power.

The increase for the standard compression F180CDI version was an additional 400 RPM, HP increased by .46HP (15% HP gain) W/1.89# additional thrust (10% thrust gain) & another 100 RPM lower idle speed.

Comparing the gains from the standard glow ignition FA180, to the FA180HCCDI BBC, HP went from 2.81 to 3.44, .63HP gain, (22% HP gain) thrust increased from 17.86# to 20.44#, a 2.58# gain (14% thrust gain) W/300 RPM slower dependable idle speed.

This puts the FA180HCCDI BBC squarely in the power output range of the FA220 W/much better fuel economy & less weight in a more compact engine package. I am very pleased W/the results.

I had also done tests W/the high compression FA180 CDI using the standard 180 carburator & the RPM levels were about midway between the FA180 CDI std CR engine & the FA180 HC CDI engien W/220 BB carb.

Total gains for the FA180HC/CDI/BBC on 30% nitro from the original glow ignition FA180 W/15% Nitro were 950 RPM, (12% increase) 1.14 HP (41% increase) & 5.31# of static thrust. (30% increase)

SrTelemaster150 is online now  
Reply With Quote
Reply


Thread Tools
Search this Thread
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off



All times are GMT -8. The time now is 10:26 AM.