Figjam14 Posted May 17, 2011 Report Share Posted May 17, 2011 can u stoke a normal 3k crank? Quote Link to comment Share on other sites More sharing options...
towe001 Posted May 17, 2011 Report Share Posted May 17, 2011 is stroking the motor the same as shaving the block down? Shaving the block is called "decking" or "block decking". Its where the piston height is raised to decease the swept volume of the cylinder, the compression ratio is also increased cause of the lowered deck height. can u stoke a normal 3k crank? Yes and no, the crank pin (or what the conrod spins on) can be machined undersized but moving the base circle outwards as its decreased in size. Another way is of building up weld to the outside of the crank pin and then having it machined down to the correct size but the base circle is moved outwards. The downsides If you machine the crank pin too much can weaken it Have to be careful of the gap between the block skirt and the conrods Piston speeds can get to be a problem at the end the strokes, more so with short conrods. Which is why longer conrods are included in a stroker kit. All in all stroking the 3k crank would be a pointless waste of money when the 4k crank is available and you'll have a better start using the 4k block or the 5k block. Phil - didn't mean to sound negative or that. I say go for it, if you have ready access to tooling, parts etc go for it. 1 Quote Link to comment Share on other sites More sharing options...
ninja-philbo Posted May 17, 2011 Author Report Share Posted May 17, 2011 i plan to mate should be fun i have the stuff sitting here so why not Quote Link to comment Share on other sites More sharing options...
Taz_Rx Posted May 19, 2011 Report Share Posted May 19, 2011 can u stoke a normal 3k crank? Yes...... its called a 4k!!! :happy: 1 Quote Link to comment Share on other sites More sharing options...
GJM85 Posted May 19, 2011 Report Share Posted May 19, 2011 (edited) Yes...... its called a 4k!!! :happy: This.... A 3k runs a 75mm bore and a 66mm stroke A 4k runs a 75mm bore and a 73mm stroke a 5k runs a 80mm bore and a 73mm stroke You see how a 5k is just a stroked and bored 3k..... :rolls: Quite clearly someones looking to get make a high powered 3k. Stroking a 3k won't get you there as they make their power through their ability to rev off tap with the shorter stroke. It's like the holden 253 and 308. You can do the all the crap in the world to the smaller one and get a lot out of it. You can also do the same thing to the bigger one and get more.... Edited May 19, 2011 by GJM85 1 Quote Link to comment Share on other sites More sharing options...
rockinrolla Posted May 25, 2011 Report Share Posted May 25, 2011 It may sound stupid but, the 7k crank should fit into the 5k block, therefore eliminating the sump problem, what would the resulting capacity be, still just 1800 or ?, are the block heights different, if so different conrods will be needed, what would you have??? :hmm: :hmm: :hmm: :hmm: :hmm: Quote Link to comment Share on other sites More sharing options...
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