Hi guys, I have another question this time on the stock .21bb engine. I'm almost done with the fourth gallon and figure the engine will be for the most part toast by this winter .Can I turn this stock engine into a hyper 8 port by putting the 8 port piston and sleeve in or will this not work. If it would work I could save a few bucks for something else. Thanks for your time!
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.21bb Into 8 Port ?
- Thread starter pee wee
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Considering that the piston and sleeve for most .21s run about $50-75 you might want to consider just upgrading to the Hyper engine. The piston and sleeve for the .21BB runs about $60.
As for mixing and matching internals engine to engine, I'd say that you could try it but these things tend to be pretty manufacturer specific. I'll let someone with more knowledge of the internals answer this question, but my initial instinct is to say no you can't make an 8 port by using the 8 port sleeve and pistion. Part of that instinct has to do with the word "port". While the piston and sleeve play a part in the whole porting bit, the engine's case is where most of the work is done.
If the piston and sleeve fit, you still need to port the engine. This requres a bit of dremmel grinding work on he inside of the engine casing.
As for mixing and matching internals engine to engine, I'd say that you could try it but these things tend to be pretty manufacturer specific. I'll let someone with more knowledge of the internals answer this question, but my initial instinct is to say no you can't make an 8 port by using the 8 port sleeve and pistion. Part of that instinct has to do with the word "port". While the piston and sleeve play a part in the whole porting bit, the engine's case is where most of the work is done.
If the piston and sleeve fit, you still need to port the engine. This requres a bit of dremmel grinding work on he inside of the engine casing.
SilentHunterKellen
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Well I may not be much help but heres my .02....The crankcase is also ported to accept only one type of sleeve and piston, the crankcase has "holes" that lead to the ports so it is non-turbulent. Putting a sleeve with a greater number of ports will probably throw of the timing of the engine and It will be very cranky to tune! Just spend the extra 80 and get the engine.