• Welcome to RCTalk! 🚀

    Join the #1 RC community where hobbyists connect, share, and get expert advice on RC cars, trucks, boats, drones, and more!

    • ✓ Friendly & passionate RC enthusiasts
    • ✓ RC tips & troubleshooting
    • ✓ Buy, sell & trade RC gear
    • ✓ Share builds & upgrades

3.3 Sleeve

This site may earn a commission from merchant affiliate
links, including eBay, Amazon, and others.
S

syphon68

RCTalk Addict
Messages
814
Reaction score
0
Points
0
Location
Portland, OR.
RC Driving Style
  1. Bashing
  2. Racing
I have rebuilt a couple of engines now and I am trying to put new bearings in a 3.3. I can't seem to get the sleeve out so I can remove the crank, Any tips or tricks before I apply my super human strength to the sleeve and end up having to replace it?
 
Put the block in the oven minus carb of course. Start @ 200F for 15 minutes, go up in heat if 200F does not work. Shoot some oil into the block and stick a popsicle stick or a couple of sturdy cable ties through the exhaust port and into the intake port as well. This way it gets even pressure for the piston to push the sleeve up. Having the flywheel installed helps, so you can turn the crank without pliers and such. Once you get it started, work slowly and gently.
 
thanks scrogg will do...didn't even think about heat I was able to get the sleeve's out of my big blocks without too much hassle.
 
While I have everything out and since this motor is only $115 to replace I think I am whipping out the dremmel and going for the port and polish too while I am at it:) I fired up the magic google machine and found some nifty step by step complete with a good stuffing of the crank what could possibly go wrong:D

http://www.e-maxximumrc.com/html/nitro_motor_mod.html
 
There is much better info and pictures on the net then that. That flow work is horrible and the ramp is all wrong. If you cut that scoop into the face of the crank you will start throwing bearings. The info is there if you look hard enough, I have posted many flow mod pictures as they aren't where the big power is made and no secrets are reveled lol. Just click on my banner and you will see two pictures that will get you much farther ahead then this link, trust me ;)

DSC07177.webp


DSC07195.webp
 
Yeah I totally agree that the Dremel work that was done sucks but it gives me a starting point on the 3.3 crank. I don't plan to cut that scoop in the face because it seems like something that could very easily throw off the balance of the crank. btw thanks for the pics very nice work.
 
Last edited:
You need a pic of a stock 3.3 crank to appreciate that modified crank.
All those external cuts on the crank are not to hard. I've done a few with no ill results. Most noticeable effect is the lighter crank spins up faster. The 3.3 is not balanced to start with anyways!
I have never been brave enough to mess with the timing. I will knife edge the intake side sometimes, that's as far as I go.
 
Last edited:
Those were just some random pictures, don't try and make your 3.3 crank look like that lol, it was more for the ramp. You don't want it to extend down the crank, it will become like a speed bump if it goes too far.
 
I didn't take any before and after pics but I did have some fun with the dremel nothing too drastic. I took the little casting dimple out of the ramp and made it allot smoother(more 45 deg w/ less transitition) also smoothed out the face of the crank some. I also ported and polished the sleeve so we will see if it ever stops raining here:) After working w/ that 3.3 I went to sealing up my LRP .28 and even though it isn't a high dollar mill you can definately see the differance in quality between the two.
 
Thanks for clarifying! Those kinds of things bug me, I have to know..One of my many quirks!
 

RC Builds

Back
Top