Weird that this engine doesn't have rings on it?

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coldvod

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Its a magnum .21 that was bought before the 90s it was made by thunder tiger. Just thought i'd be fun to show off some old engine parts
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nitropro

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That is awesome to see old engines still being loved. I don't think any nitros that small have rings. Hope that helped somewhat.
 

coldvod

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That is awesome to see old engines still being loved. I don't think any nitros that small have rings. Hope that helped somewhat.
I thought my redcat sh 21 had rings which is why i mentioned it
 

nitropro

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Oh ok, no worries. Your redcat engine definitely doesn't, just a different piston design may have lead you to think that.

Happy rc'ing!
 

coldvod

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Oh ok, no worries. Your redcat engine definitely doesn't, just a different piston design may have lead you to think that.

Happy rc'ing!
Thanks i might've misremebered since its been a feq months. If you want to see this engine run by the way ill be posting a video whenever i get around to ordering a bump box ( i have two of these and one them is fully rebuilt )
 

coldvod

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Cool, look forward to seeing an update!
I also have the manual and the box warraty stickers everything even a receipt. 4 gallons for 68cad$
 

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olds97_lss

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Quite a few of the nitro pistons I"ve had had rings cut into the piston. Not sure what their purpose was, maybe to try and hold oil? They weren't actual mechanical/spring rings like a normal engine, just a detent in the piston. Well... I could have swore some of them did anyway.

This is the only piston photo I have from one of the many engines I've had over the years... it didn't seal well anymore. lol! It was an OS 21RG:
2007-0224-OS21RGBearingBrokePistonGouge.jpg


One of the ball bearings in the rear bearing split in half and went through the engine like a hammer drill. Made a mess out of the poor thing.
 

coldvod

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Quite a few of the nitro pistons I"ve had had rings cut into the piston. Not sure what their purpose was, maybe to try and hold oil? They weren't actual mechanical/spring rings like a normal engine, just a detent in the piston. Well... I could have swore some of them did anyway.

This is the only piston photo I have from one of the many engines I've had over the years... it didn't seal well anymore. lol! It was an OS 21RG:
2007-0224-OS21RGBearingBrokePistonGouge.jpg


One of the ball bearings in the rear bearing split in half and went through the engine like a hammer drill. Made a mess out of the poor thing.
I thought when I was taking apart my redcat engine it had a small ring. After taking the piston out i think you're right. I wouldn't have thought that they would make a detent. It seems useless
 

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