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Old 09-25-2005, 02:15 AM   #1
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Default RB WS7 piston

Hello,
What kind of a different piston would fit a RB WS7 engine ?
I have an overheated ws7 engine, the sleeve is in top shape, what i can't say about the piston. So i need only the piston. Maybe i could fit in a piston from other engines ? Don't want to spend 105 on a new pair for the rb.
Thank you
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Old 09-25-2005, 07:33 AM   #2
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Unfortunately they are sold in matched sets. I have never heard of pistons sold separately.
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Old 09-25-2005, 07:41 AM   #3
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Quote:
Originally Posted by Davidka
Unfortunately they are sold in matched sets. I have never heard of pistons sold separately.
And also the are machined to work together. Even another piston out of a RB motor probably will either be too big for the sleeve or too small. More than likely the sleeve is stressed if you damaged the piston.
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Old 09-27-2005, 02:04 PM   #4
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Is it possible to put a c5 piston in a ws7 ? The bore is the same
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Old 09-27-2005, 03:16 PM   #5
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You could try it but the stroke of those two engines might not be the same. If the wrist pin is in a different position on the piston it will mess up the port timing or worse of the piston crown travels farther up the sleeve. Assemble it and put the piston @ bottom dead center. The top of the piston should be exactly even with the bottom of the exhaust port. If it is, it should work providing the piston/sleeve fit is not too tight.
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Old 09-27-2005, 05:04 PM   #6
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I've had good luck having Rayaracing squeezing my piston/sleeve back to a good pinch. Under 20 bux shipped. Shoot him an email. Here's his website: Rayaracing Resizing
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Old 09-27-2005, 07:25 PM   #7
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OS Rocket on Ebay also does a pinching service. I am maybe going to be sending a Collari to them this winter...heard great things.
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Old 09-27-2005, 07:31 PM   #8
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If you go with osrocket make sure and tell him a "light" pinch. Only reason I recommend Ray over os is I got one done by each at the same time. The one osrocket did I can't roll the sucker over. Going to have to mount it on a board and start with a drill. The one from Ray was tight, but I could start it. Saved me alot of frustration. Just raced that engine in my 1/8 on sunday and it ran great and idled like a kitten.
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Old 09-28-2005, 08:34 AM   #9
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What do they do when they give the engine a squeeze ? The bad thing about the piston is that it has big deep scratches only at the exhaust port :/ Ant the sleeve has seen only a gallon.
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Old 09-28-2005, 02:43 PM   #10
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It crimps the sleeve so that the piston is tighter in the bore like when new. My sleeve got ovaled out of round, and Ray got it round again and gave it a pinch as well. I'd email him and ask what he thinks about your piston. Maybe send a pic of it with the email. Maybe it can be sanded or buffed out then the sleeve pinched back to size.
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Old 10-11-2005, 12:54 PM   #11
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I dont think other piston sleeves will work in that set up. But i have put a Ws7II piston sleeve in my S7 and that thing rocks!!!!!!!!!!!! it's cheaper to get it pinched than buy a new motor. I have went tru more than 5 motors in 2 seaons of racing, and had them all pinched and they are as like new now. I bought the tool from ebay, instead of used rayracing, and after a few tries i got them right perfect..
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Old 10-11-2005, 01:34 PM   #12
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Default pistons and sleeves

RB ws7,ws7 II,s7, s7 II and s5 piston and sleeves will all fit that motor
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Old 10-11-2005, 06:05 PM   #13
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also the eco 3 fits... about $70bux
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