72? Big Bore vs Stroker ? - Club700XX - Honda TRX700XX Forum
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post #1 of 45 Old 02-28-2011, 05:49 PM Thread Starter
 
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72? Big Bore vs Stroker ?

The forum has gain alot good "Motor Men" , so i pose this question .
Advantages and disanvantages of either going big bore or stroker to get above 700cc for the xx.
I tried this once on another forum to do a 470cc on a TRX450r and never got a good answer.
I can't afford both.
Stroker is with stock spec piston and big bore is with stock crank.
Looking for power/torque differances or what would show up an a dyno chart.
I know this is guess work but it would help.

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post #2 of 45 Old 03-01-2011, 01:39 AM
 
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it depends on the head really and what it would like to see...
with this bore and stroke id go with a big bore first to open up the top end power a bit more... but its a trade off if you have a good condition cylinder then a stroke is easily done...

the stroke will always bring in the power sooner


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post #3 of 45 Old 03-01-2011, 05:29 AM
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A big bore unshrouds the valves for better flow. A stroker crank adds leverage to the crank centerline for torque.

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post #4 of 45 Old 03-01-2011, 07:28 AM
 
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i generally see higher hp gains come from bore size, but having stroke is important as well the longer the power band the faster a bike is. Its generally a combo of both is what works best if you in a perdicament where $$ is the issue choose what needs replacing if both crank and cylinder are good i would say do big bore first then stroke later if crank needs replacing take care of that.


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post #5 of 45 Old 03-02-2011, 12:54 AM Thread Starter
 
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Thanks Daniel,Bo and Eric.

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post #6 of 45 Old 03-02-2011, 02:26 AM
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This is good stuff! I like threads like this
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post #7 of 45 Old 03-02-2011, 04:46 AM
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Pretty much everyone on this site has rode a fairly wide range of bicycles I hope. Ever get on a bicycle that the pedals were fairly close together on the crank(a short crank like on a 12" bicycle). You can pedal it up to speed fairly quickly once it got going but you could only pedal it so fast. You get to a hill and it got really hard to pedal because the pedals were so close together you couldnt get any leverage on the crank. Now get on a bicycle that has a carnk with the pedals further away from each other. Its easy to get started and when you come up to a hill its easy to get leverage on the crank to push it over. Onve you got some speed up though the faster you got the more out of control it felt to really get it going fast. Think of your legs as connecting rods, the longer your legs(connecting rods) were the more controlled it seems at high speeds.
With that being said, for the engine to be as effecient as possible the longer the stroke the longer the connecting rod needs to be(for the most part).

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post #8 of 45 Old 03-02-2011, 02:58 PM Thread Starter
 
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Cheers Bo , Now I understand better.
I guess my limiting factor will be the exhaust. I got tested with the Barkers with QC and screen at 96db. The UK limit is 94db.
So it would have to be something like a FMF Q4 or Leo Vince.

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post #9 of 45 Old 03-02-2011, 08:40 PM
 
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Us Pontiac guys stand behind long rod motors ;-)

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post #10 of 45 Old 03-02-2011, 09:16 PM
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My mopar will be bored and stroked, my atv.... haven't decided yet


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