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Saito 56 probs

Old 04-25-2010, 05:02 PM
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tigil
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Default Saito 56 probs

Hi all ,my engine just run at idle and when I try to speed up the engine die.

I changed the glow plug for a new OS F and I tried a tank to the outside of the aircraft and I have always the same problem.

I removed the main needle and pumping gas into the carburetor inlet to remove dirt and no change.

W can I do ??
Old 04-25-2010, 05:03 PM
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w8ye
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Default RE: Saito 56 probs

open the low needle some
Old 04-25-2010, 05:08 PM
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Default RE: Saito 56 probs

I would like to understand why opening the low end will resolve the problem ?
Old 04-25-2010, 05:19 PM
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Default RE: Saito 56 probs

You don't understand that you don't question W8YE. You just do it and it works.

Sincerely,

SPACEWORM
Old 04-25-2010, 05:44 PM
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Default RE: Saito 56 probs

ORIGINAL: w8ye

open the low needle some
Some turns? 1 , 2 3, turns
Old 04-25-2010, 06:07 PM
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Default RE: Saito 56 probs

Just 1/4 turn
Old 04-25-2010, 06:26 PM
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Default RE: Saito 56 probs


ORIGINAL: spaceworm

You don't understand that you don't question W8YE. You just do it and it works.

Sincerely,

SPACEWORM
Rarely do I miss the occasion to become more knowledgeable and you ?
Old 04-25-2010, 07:40 PM
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Default RE: Saito 56 probs


ORIGINAL: tigil

I would like to understand why opening the low end will resolve the problem ?
It is because the condition you describe indicates a lean mixture at idle, that is when you open the throttle and engine just dies. If you were to open the throttle and the engine sputters, stumbles, and smokes it would indicate a too rich mixture.
Old 04-25-2010, 08:08 PM
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Default RE: Saito 56 probs

No, next to W8YE and a zillion other resident experts on RCU, I know it all already. However, I thought I was wrong once, but, I was wrong about that also. Actually I do consider W8YE to be the expert and I was complimenting him, not disparaging you. My apoligies to you.
Old 04-25-2010, 08:23 PM
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Default RE: Saito 56 probs

Tig, one more little jewel, when the low speed needle is too lean it causes the high speed needle to be vague or even ineffective. In this shot of a Saito carb the "catseye" slot is where the fuel flows into the airstream, the sleeve that slides in and out over the spraybar is the " low speed needle", when the low speed needle covers up too much of the catseye you get the condition you've described.
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Old 04-25-2010, 09:57 PM
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Default RE: Saito 56 probs

Here is great reading on tuning Saito engines (begin at post #9) http://www.rcuniverse.com/forum/m_5843055/tm.htm
Old 04-26-2010, 11:30 AM
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wcmorrison
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Default RE: Saito 56 probs

Go to http://saito-engines.info. Tons of information on Saito engines including how to tune them.

Cheers,

Chip
Old 04-26-2010, 04:27 PM
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Default RE: Saito 56 probs


ORIGINAL: rcdude7


ORIGINAL: tigil

I would like to understand why opening the low end will resolve the problem ?
It is because the condition you describe indicates a lean mixture at idle, that is when you open the throttle and engine just dies. If you were to open the throttle and the engine sputters, stumbles, and smokes it would indicate a too rich mixture.
1 day before the engine was running very nice with this setting, and the day after, this problem come without touching nothing
Old 04-26-2010, 05:08 PM
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Default RE: Saito 56 probs


ORIGINAL: tigil


ORIGINAL: rcdude7


ORIGINAL: tigil

I would like to understand why opening the low end will resolve the problem ?
It is because the condition you describe indicates a lean mixture at idle, that is when you open the throttle and engine just dies. If you were to open the throttle and the engine sputters, stumbles, and smokes it would indicate a too rich mixture.
1 day before the engine was running very nice with this setting, and the day after, this problem come without touching nothing
That can happen if a piece of debris in the fuel clogs the passages in the spraybar. Do you use a fuel filter?
Old 04-26-2010, 05:13 PM
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Default RE: Saito 56 probs

I use a filter in my gaz can but this plane was in storage somes years

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