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Wiseco 100mm 11:1 piston
Found two options (see below) for a higher compression piston in the stock bore but didn't find a lot of info in the forums on this let alone test results.
I contacted 3pracing about the Wiseco piston and according to them it's a straight fit in stock cylinder and the piston was custom made for them which makes sense as there is no other info on this piston on the web anywhere. It says 11:1 'standard' compression ratio but as it looks to have a raised dome seems incorrect so not 10:1, I sent them an email to question this. What do you guys think of this one? If the piston is exact 100.00 mm I would probably need to hone the cylinder. I'm planning to combine it with a head porting job. If people are interested I could post before and after dyno results.. when I find a dyno willing to operate in the weekends or evening that is :icon_lol:. I'm running a 2005 XTX with stock ECU - should I be worried about knock with RON 95 or 98? http://www.3pracing.com/en/wiseco-pi...0r-xt660x.html http://www.3pracing.com/media/catalo.../1/11613_2.jpg I also found a CP one that was posted here before, but I didn't get a response from the shop so far: http://www.gw-racing-parts.de/index2...is=2010&lan=en |
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So I went ahead and ordered the Wiseco piston and received it last weekend after some logistical issues. After some doing some measurements things seem to be in order. It seems to be a Raptor 700 piston (which the label also states) but in 100 mm - I don't think any other shop sells them so I guess it actually is a custom.
Some specs:
So I'm hoping it will be a straight drop in, fingers crossed. Will post some updates when installing in case anyone else is interested. |
Let us know how this goes for you pal I'm interested
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I made some calculation on the compression ratio and the 11:1 seems accurate if piston to deck height remains unchanged (I'm not sure yet about this).
Assuming 10:1 is the exact stock compression ratio this gives a combustion chamber volume of 73,3 CC. The dome has a volume of approximately 7,8 CC. 659,73 cc + 65,5 cc / 65,5 cc = 11,07:1 CR |
I have been working on the engine the last week, so far things look good. The piston + pin is about 20 grams heavier than the stock one. Piston skirt is only slighly shorter.
While the head was off I have also adjusted the ports so they are a bit better flowing, no adjustments to valves. Once the bike is made whole again it's off to the dyno somewhere in the next weeks for a tune.. will post some results here as well. |
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Today I had the bike on the dyno to have a custom PC map made and to see results. As you can see in the graph I ended up with 53 bhp and 70 Nm at the backwheel which I'm pretty happy with! The first run of 49.8 bhp is one of the maps I got from the forum (CaptMoto's map) - the bike was not running to great on this too rich at low rpm as you can see. I was running a soft rain tyre on the dyno, the guys from the dyno place remarked that a hard street tyre would most likely have added a few bhp.
Bike runs great now the new map also made a big difference! Plenty of power, big increase versus slip-ons and fuel mod only :walk1: I have used 95 octane with the 11:1 piston without any signs of knock / detonation - even when the bike was running lean, I do plan to run 98 octane when I can though. I will see if the map can be added on the forum as there is no map yet for a similar setup. The bike had the following setup: Wiseco 100 mm 11:1 piston Stage 1 headport K&N Stage 1 & snorkel removed bigger snorkel hole and 4x 1 inch vents in side Superpole slip-ons PCV 15T front 47T back |
Nice work mate, would have been interesting to have done a dyno run before doing the piston to see the difference on paper but I know thats not always easy. I have done the stage 2 hot cam mod and just tuning my power commander with my seat of the pans o meter :)
If you want it to sit a revs more happily I suggest the stage 2 hot cam, moves the power up the rev rage a bit and the motor just feels happier at higher rpm. |
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Cool stuff! Did you notice any increase in vibration due to heavier piston or higher compression? |
I never noticed any extra vibrations with my big bores on this motor.
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The saga continues...
Installed a different camshaft from Off The Road some weeks ago and had her on the dyno now. Result is 61.3 HP with just the camshaft changed and a little more modification to the airbox. Power output below 5500 RPM is down a bit but still pulls very strong until the rev limiter, looks like there might be some more power beyond the rev limited even. Altogether with the piston and flowing the head ports a bit I think it's a good combination. Only downside for me is the engine ticking got considerably louder which is normal result with this camshaft.. in stock form the xt engine of course isn't exactly running like a sewing machine. https://pli.io/cLePU.jpg https://imgur.com/ABzXmOA |
so from 53hp to 61hp due to the camshaft from otr??
torque moved to higher revs then? valves tapping harder due to steeper cam design? |
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You're right torque is higher relatively in higher revs but overall is a bit lower just stays on longer at high revs now. I guess its the steeper angle yeah that makes them click clack LOUD, valve lash is set right in the middle now maybe if I feel brave I will put them a bit tighter lol. |
Raptor 5050 cam results below, we saw with the Hot cam stage 3 around 60hp
http://i68.tinypic.com/33op45s.jpg |
The cam I would have chosen if it was a simple drop in nice midrange and suited well for stock rev limiter, found it difficult to source used decompression bits.. new those bit are more expensive than the camshaft!
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