SMALL - espritmodel.com SMALL - Telemetry SMALL - Radio
Reply
Thread Tools
Old May 04, 2011, 07:07 PM
Montana Transplant
mt_flyer's Avatar
United States, OR, Klamath Falls
Joined Aug 2005
1,932 Posts
Turbo Header test 1 is in;

Amb temp: 96*
1240 msl

Magnum .91 well used
APC 13 X 8

Stock Muffler
10750 lean to peak
10500 3 clicks to rich
2650-2700 idle
EGT 425* peak is 460*
CHT 248*

TH Muffler
10850 lean to peak
10600 3 clicks to rich (HSN is a 1 click leaner than stock muffler peak)
EGT 400* peak is 430*
CHT 240*
2200-2400 idle (not as rough)

looks like it will run cooler at a leaner mixture, higher RPM, smoother and slower idle... throttle response seems quicker with no hesitation. May have to go to a larger prop now.
mt_flyer is offline Find More Posts by mt_flyer
Reply With Quote
Sign up now
to remove ads between posts
Old May 05, 2011, 09:37 PM
Perfect 3pt inverted landing!
teookie's Avatar
USA, AL, Huntsville
Joined Oct 2008
3,089 Posts
Saitos are good, but they do require maintenance. Mine is roughly 3 years old and I have had to replace the bearings, and clean up a sticky exhaust valve. I am pretty hard on it though.

Sent from my ADR6300 using Tapatalk
teookie is offline Find More Posts by teookie
Reply With Quote
Old May 05, 2011, 11:12 PM
Montana Transplant
mt_flyer's Avatar
United States, OR, Klamath Falls
Joined Aug 2005
1,932 Posts
Quote:
Originally Posted by mt_flyer View Post
Turbo Header test 1 is in;

Amb temp: 96*
1240 msl

Magnum .91 well used
APC 13 X 8

Stock Muffler
10750 lean to peak
10500 3 clicks to rich
2650-2700 idle
EGT 425* peak is 460*
CHT 248*

TH Muffler
10850 lean to peak
10600 3 clicks to rich (HSN is a 1 click leaner than stock muffler peak)
EGT 400* peak is 430*
CHT 240*
2200-2400 idle (not as rough)

looks like it will run cooler at a leaner mixture, higher RPM, smoother and slower idle... throttle response seems quicker with no hesitation. May have to go to a larger prop now.
UPDATE:

flight report...

throttle response is much better...

with factory muffler I flew for 10 min and had an average of 1 oz left in the 12oz tank..

TH muffler I flew for 10 min and had average of 3.5 oz left...

this was the average of 3 flights stock and 3 flights TH, flying the same pattern...

As far as I am concerned this is a good quality product with quality workmanship and savings/ performance benefits... and 4 more flights per gallon
mt_flyer is offline Find More Posts by mt_flyer
Reply With Quote
Old May 06, 2011, 07:32 AM
Registered User
GCplane's Avatar
Manassas, Virginia
Joined May 2008
425 Posts
MT, Which muffler has a better sound in the air? I mean sound more like a real plane or are they about the same? Which one is quieter?
GCplane is offline Find More Posts by GCplane
Reply With Quote
Old May 06, 2011, 09:16 AM
Registered User
Jimmy Hoffa's Avatar
Orlando, FL
Joined Jul 2004
2,344 Posts
Quote:
Originally Posted by teookie View Post
clean up a sticky exhaust valve.
Castor will cause that.
Jimmy Hoffa is offline Find More Posts by Jimmy Hoffa
Reply With Quote
Old May 06, 2011, 10:30 AM
Dieselized User
gkamysz's Avatar
Chicagoland
Joined Feb 2000
7,393 Posts
MT, how did you measure the temperatures, specifically EGT?

Greg
gkamysz is offline Find More Posts by gkamysz
Reply With Quote
Old May 06, 2011, 11:17 AM
Montana Transplant
mt_flyer's Avatar
United States, OR, Klamath Falls
Joined Aug 2005
1,932 Posts
...
mt_flyer is offline Find More Posts by mt_flyer
Last edited by mt_flyer; May 06, 2011 at 11:20 AM. Reason: double post
Reply With Quote
Old May 06, 2011, 11:20 AM
Montana Transplant
mt_flyer's Avatar
United States, OR, Klamath Falls
Joined Aug 2005
1,932 Posts
Quote:
Originally Posted by GCplane View Post
MT, Which muffler has a better sound in the air? I mean sound more like a real plane or are they about the same? Which one is quieter?
On this motor there was very little sound change.. I can't check db... by ear the TH is a little louder at high throttle.... can't hear any difference at idle..

Quote:
Originally Posted by gkamysz View Post
MT, how did you measure the temperatures, specifically EGT?
Greg
I have temp probes... CHT uses a temp band that I put arount the cyl head in between the cooling fins...

EGT uses a long probe that I put into the exhaust about a 1/2" from the head

I back these up with an infrared gun... the cht has been right on.. egt slight difference reading the outside of the exhaust pipe at the head..

You could use a gun to get CHT and EGT for peak settings.

I have guest for the next week.. I will be testing the Saito 150 and a new Saito 100 once they leave...
mt_flyer is offline Find More Posts by mt_flyer
Reply With Quote
Old May 09, 2011, 05:19 PM
Registered User
u2builder's Avatar
USA, NH, Alstead
Joined Oct 2007
4,977 Posts
Are the temps that you list pretty typical for a properly tuned engine?

Does the shiny aluminum on the cylinder influence the reading with an IR gun?
u2builder is offline Find More Posts by u2builder
Reply With Quote
Old May 10, 2011, 11:04 AM
Montana Transplant
mt_flyer's Avatar
United States, OR, Klamath Falls
Joined Aug 2005
1,932 Posts
Quote:
Originally Posted by u2builder View Post
Are the temps that you list pretty typical for a properly tuned engine?

Does the shiny aluminum on the cylinder influence the reading with an IR gun?

the CHT is at a properly tuned 3-500 rpm richer than peak... I don't run them long enough at peak RPM to measure peak CHT as this can lead to motor damage.. (takes too long for head to get hot and cool down)

the EGT is at lean peak. egt will go down as mixture is richened...usually about 75-100*

IR gun will read any surface... very accurate.. +/- 3* difference than probe on mine
mt_flyer is offline Find More Posts by mt_flyer
Reply With Quote
Old May 10, 2011, 01:15 PM
Dieselized User
gkamysz's Avatar
Chicagoland
Joined Feb 2000
7,393 Posts
Read the manual on your IR sensor. Some can be switched to read polished surfaces some can't. Typically there is enough dirt on the engine to get a reasonable reading with any IR sensor.

EGT seems low to me, but it depends on where it's read. I'll be doing some measurements myself soon.

Greg
gkamysz is offline Find More Posts by gkamysz
Reply With Quote
Old May 21, 2011, 08:51 PM
Registered User
u2builder's Avatar
USA, NH, Alstead
Joined Oct 2007
4,977 Posts
Hey Saito guru's, can someone help me with why my Saito 125 backfired when I went to start it.

It is a used Saito, but looks very new and was represented as being fairly new. It seems to have good compression. I adjusted the valves when I got it.

I set the needle at 5 turns out as per the manual. I did not adjust the low speed, assuming, perhaps incorrectly, that the previous Owner had it set properly.

Before I started it I cleared the prop by turning it a few revolutions.

When I put the electric started on it there was a violent backfire that removed the propnut, which I had tightened pretty well, as well as the prop nut, prop, and spinner.

It was a little scary with the prop flying off like that. Does anyone have any suggestions as to what I should do and/or check before I try to start it again. Thanks.
u2builder is offline Find More Posts by u2builder
Reply With Quote
Old May 21, 2011, 08:59 PM
Montana Transplant
mt_flyer's Avatar
United States, OR, Klamath Falls
Joined Aug 2005
1,932 Posts
Quote:
Originally Posted by u2builder View Post
Hey Saito guru's, can someone help me with why my Saito 125 backfired when I went to start it.

It is a used Saito, but looks very new and was represented as being fairly new. It seems to have good compression. I adjusted the valves when I got it.

I set the needle at 5 turns out as per the manual. I did not adjust the low speed, assuming, perhaps incorrectly, that the previous Owner had it set properly.

Before I started it I cleared the prop by turning it a few revolutions.

When I put the electric started on it there was a violent backfire that removed the propnut, which I had tightened pretty well, as well as the prop nut, prop, and spinner.

It was a little scary with the prop flying off like that. Does anyone have any suggestions as to what I should do and/or check before I try to start it again. Thanks.
start it with the throttle almost closed.. barely above idle... too much throttle can cause that...also a lean mix... but it sounds like you have it rich...

hopefully someone else will jump in too..
mt_flyer is offline Find More Posts by mt_flyer
Reply With Quote
Old May 22, 2011, 07:57 PM
Registered User
Northwest Indiana
Joined Feb 2011
1,461 Posts
Quote:
Originally Posted by mt_flyer View Post
start it with the throttle almost closed.. barely above idle... too much throttle can cause that...also a lean mix... but it sounds like you have it rich...

hopefully someone else will jump in too..
Actually that is usually caused by a rich low end.....lean it out a it and hat will stop.

I do have a question for you guys though. I have a new Saito 100 in my new aeroworks extra 300 . It is broken in well but it seems to hang at a high idle when when you put the throttle all the way down and then it settles. Is that caused typically by a lean low end?
CRFan1 is offline Find More Posts by CRFan1
Reply With Quote
Old May 22, 2011, 09:08 PM
Registered User
I TOBOR's Avatar
Joined Feb 2007
2,838 Posts
U2, when using an electric starter do not prime it first. Let it pick up the fuel on its own.
I TOBOR is offline Find More Posts by I TOBOR
Reply With Quote
Reply


Thread Tools

Similar Threads
Category Thread Thread Starter Forum Replies Last Post
Composites Forum on RC Groups? TGoodwin Composites Fabrication 9 Oct 01, 2004 04:49 AM
PLEASE KILL ACTIVE X on RC Groups. windsurfer Site Chat 7 Apr 19, 2004 03:16 PM
Help! Large font on RC Groups! Lenny970 Site Chat 4 Mar 20, 2004 11:52 PM