xjamesd93 Posted June 3, 2009 Report Share Posted June 3, 2009 How many cc's does a 4mm stroker cub put out?? I was thinking 421 but im not sure, reason for asking is i need to know if i need bb pipes or small bores..and im also jsut interested in the cc's...lol Quote Link to comment Share on other sites More sharing options...
high octane junkie Posted June 3, 2009 Report Share Posted June 3, 2009 (edited) it depends on bore size.. 65mm bore 58mm stroke = 385cc. 68mm bore 58mm stroke = 421cc. 72mm bore 58mm stroke = 472cc. i'm not sure if they make a different size bore in cub cylinders, i've only seen these three. Edited June 3, 2009 by high octane junkie Quote Link to comment Share on other sites More sharing options...
dragbanshee98 Posted June 3, 2009 Report Share Posted June 3, 2009 http://www.havocperformance.com/ENGINECALCULATOR.htm this should help Quote Link to comment Share on other sites More sharing options...
xjamesd93 Posted June 3, 2009 Author Report Share Posted June 3, 2009 thanks guys very helpful and its 421.3cc's so i beleive i need big bores...right?? isnt is 350-420 = small bore 421 - up = big bore ???? THANKS Quote Link to comment Share on other sites More sharing options...
RadarRacing Posted June 3, 2009 Report Share Posted June 3, 2009 most of the time not. 450ccs or so use bigbores. It depends on your builder and his porting and how he sets you up with timing etc. Most 421s use small bores Quote Link to comment Share on other sites More sharing options...
xjamesd93 Posted June 3, 2009 Author Report Share Posted June 3, 2009 most of the time not. 450ccs or so use bigbores. It depends on your builder and his porting and how he sets you up with timing etc. Most 421s use small bores oh, ok....i wasnt sure and its just a stock 4mm stroker 68mm cub Quote Link to comment Share on other sites More sharing options...
dajogejr Posted June 4, 2009 Report Share Posted June 4, 2009 If you're going to leave the cubs stock, as in no porting...and run short tracks, some will tell you big bores. For hill shooting or longer distance, small bores. It is a coin flip. If you're going to have someone port and/or set that motor up, ask them what they prefer. I used small bore inframes on my 4 mil cub, I use big bore OOF on my 10 mil cub. I've been told to try small bores for the 300 foot riding that I do... Quote Link to comment Share on other sites More sharing options...
xjamesd93 Posted June 4, 2009 Author Report Share Posted June 4, 2009 im am eventually going to get a full drag port done later down the road when i get more $$ so im really confused and dont have a clue what to do...lol....but i have come to the conclusion that either pipe will work and you will either gain or lose about 2hp depending on which pipe you use..lol i dont know what to do Quote Link to comment Share on other sites More sharing options...
dajogejr Posted June 4, 2009 Report Share Posted June 4, 2009 Based on your other post, once it's assembled...I'd look for another builder. A lot of people can put these together, but putting them together and getting it to run right is another story. It could be more than 2HP, could be less. But it will change how/where the pipe hits and how broad/long the power curve is as well. I say go with small bores. Quote Link to comment Share on other sites More sharing options...
shanYE west Posted June 4, 2009 Report Share Posted June 4, 2009 The 421 cub will favor the small bores unless the motor is setup for the big bore pipes.. I've ran both. Quote Link to comment Share on other sites More sharing options...
xjamesd93 Posted June 4, 2009 Author Report Share Posted June 4, 2009 well for now it will just be a stock 421, so i guess i will run small bores after it gets a full drag port, would the switch to bb be beneficial? Quote Link to comment Share on other sites More sharing options...
dajogejr Posted June 4, 2009 Report Share Posted June 4, 2009 I would ask whomever you're gonna have port it. I had Kevin Herr @ HJR port my cub, 10 mil, and he actually said to run small bores on mine as well. BUT...I already had nice, Chrome, out of frame big bore shearers, and it likes them. I'd like to try a new set of Shearer small bores. I have other things to buy before I shell out several hundred for pipes however! Quote Link to comment Share on other sites More sharing options...
shanYE west Posted June 4, 2009 Report Share Posted June 4, 2009 I would ask whomever you're gonna have port it. I had Kevin Herr @ HJR port my cub, 10 mil, and he actually said to run small bores on mine as well. BUT...I already had nice, Chrome, out of frame big bore shearers, and it likes them. I'd like to try a new set of Shearer small bores. I have other things to buy before I shell out several hundred for pipes however! Wanna sell the big bores?? lol Quote Link to comment Share on other sites More sharing options...
Blewbyu Posted June 5, 2009 Report Share Posted June 5, 2009 http://www.havocperformance.com/ENGINECALCULATOR.htm this should help That's a cool link! Lol I'm glad to see its getting used. Quote Link to comment Share on other sites More sharing options...
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