I have a Saito 300 twin on nitro - Page 2 - RCCanada - Canada Radio Controlled Hobby Forum
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Old 09-13-2016, 12:16 PM   #11
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Re: I have a Saito 300 twin on nitro


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Yeah Joe, gas does have some advantages besides economy, not having to worry about the bearing getting rusted from the glow fuel or the engine getting gummed up from sitting . but damage from detonation or preignition is also more likely on gas if you get the compression / timing or mix wrong. the picture shown looks like it might just be detonation or preignition inspired damage LOL. doubtful it was rpm alone because glow engines rev much higher and they stay together just fine. preingition is when pressure /heat or something hot in the chamber(carbon) lights the mixture before the plug fires. Detonation is when the mixture lights correctly with the plug ,the burn is going well and pushing the piston down until the pressure and heat surpasses the fuels ability to resist exploding (detonation). in both cases forces well in excess of the engine design will be reached. hence the picture above . cheers Roger
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Old 09-13-2016, 12:30 PM   #12
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Re: I have a Saito 300 twin on nitro

Not a good assumption. The broken rod above was from a maching job gone bad, the bushing inserted was a bit oversized and left too little material on the king rods. FYI, the FG86's I believe (search google) came with Aluminum bushings aka No bushings out of the factory.

You can see by all the blackness in the oil that there was fatiguing happening and if you look closely, the actual broken piece on the king rod looks too smooth for a quick fracture.
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Old 09-16-2016, 06:38 PM   #13
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Re: I have a Saito 300 twin on nitro

Thanks for all the input, I have sen a leter to CH in Florida and I will await their answer . The I will see what I am ging to do with it. Thanks again, Al
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Old 09-16-2016, 06:41 PM   #14
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Re: I have a Saito 300 twin on nitro

Hey JoeT, if your MAAC number makes you almost ancient What does that do to me............... 5515L................. Al
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Old 09-16-2016, 07:04 PM   #15
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Re: I have a Saito 300 twin on nitro

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Hey JoeT, if your MAAC number makes you almost ancient What does that do to me............... 5515L................. Al
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Old 09-17-2016, 10:42 AM   #16
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Re: I have a Saito 300 twin on nitro

Joe the black oil is normal for a gas running engine it's mostly carbon. but opinions will vary LOL . why would a rod cause black oil just because it was to weak .It would have worked fine until it failed . I could see if the bushing was undersized and spinning in the rod but you can see the bushing was a tight fit because there is no wear on the outside of the bushing . if it was a weak rod .it was weak rod . but like I said above this a good example of the type of damage you can expect from incorrectly setting up a gas engine (I guess you can add over machining the rod/ moron factor). I think it was a very good assumption, the engine was without question pushed beyond what it was NOW designed, if you redesign the engine to only take 3000rpm you better respect those limits .Without knowing the owner had been deliberate in weakening the rod, it was the most likely cause. Anyway the statements I made are fact and will apply to any engine. I was not trying to diagnose the picture only use it for a example.cheers Roger



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Originally Posted by JoeT View Post
Not a good assumption. The broken rod above was from a maching job gone bad, the bushing inserted was a bit oversized and left too little material on the king rods. FYI, the FG86's I believe (search google) came with Aluminum bushings aka No bushings out of the factory.

You can see by all the blackness in the oil that there was fatiguing happening and if you look closely, the actual broken piece on the king rod looks too smooth for a quick fracture.
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