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apex really 150hp?


actionjack said:
Maybe I should just burn up 20 miles on the grass. If Yamaha's break in method is just 15 mins of idling why don't the dealers do it themselves then change the oil?
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You could break it in on the grass.


Yamaha's method is not to change the oil until 500 miles.
 
Kevin I'm saying you can dyno the engine newand at 500 miles,to 2000 miles and there is no hp increase.Why people think's it gets faster is the chasis is broke in.
 
Ya motoman did not say anything about breaking the motor in on the grass,as us grass draggers sometimes do. Myself i used to break my sled chassie/motor in on my trailer with it backed down into a lake,with 4-5 inches of water in the skid to keep load on the motor,much like snow does,plus the water in the fall is quite cold,never have any over heating with this application,but just dont fill the skid frame with to much water,as it creates to much load,and may cause to much heat to fast,but on the other hand maybe this is what moto is talking about,cause when you load the water brake dyno you are loading it in much the same way,going straight to max load quickly and reamaining there for 10-20 seconds at max load,so maybe this is ok,any thoughts on this allen??? Have you ever broken in any of your race sleds in this manner allen??? I have had faster sleds from this practice,than i have with just a garden hose spraying water on track and spinning it up..... :ORC
 
We break all our 4-strokes in first with no load on them and the track simply spinning running from 1500 rpm to 7000 rpm for 15 minute intervals with our cool down connected to keep engine temps at normal operating temps. This will usually result in roughly 75 miles of operation of the track spinning and roughly 6 hrs of run time. We then put it through the same course except this time with the track dyno hooked up (it spins a 900 lbs drum) and run from idle up to full operating rpm (usually adds another 75 miles on it) and a total of 12 hours of run time. As Ryan (pro116) said, the motor will not make anymore HP after 30 miles compared to 1000 miles. It's all in the chassis and how it puts the HP to the ground easier.
 
The water treatment sounds intresting. What about any problems from any sand washed up onto the bearings & wear areas??
 
You lost me on the sand,now i dident talk about the application at all,but guess i should. What ya need to do this is an open trailer,that you can back down in to the water,with your sled up onto a jack stand of some sort,and only back down far enough into the water so as to get about 4-6" of water into the skid frame,you dont want to bury the back into the water,to much water and it will be like breaking it in under severe conditions,such as climbing in deep snow,plus so much water and you might drown lol because you will get wet,if you stay on the seat the whole time,after a few full throttle blasts for a 10-15 second duration,you can settle in on a rev range you feel is safe,and tape the throttle to that speed/rev and sit back and have a drink while the miles pile up,but make sure you change the speed/revs to indicate trail riding and quite often rev it up to 10,500 for short blasts,but i like what motorman said about changing oil after 20 or so hard miles,after break in,it cleans out all the first impurities,let me know how it goes.... ;)!
 
OK, I have a question for a couple of you experts. My previous vette was a 75, if anybody here is familiar with vettes you know that was the weakest year made, 165 hp to be exact. I installed a brand new GM crate motor rated at 345. There was a tag attached to the engine that said "Full power will not be achieved until after several hundred miles and with proper break in". There were break in instructions but I don't really remember what they were. Once installed I was very dissapointed with the engine. I couldn't even get the tires to squak the least bit. One day (several hundred miles later) I was out cruising when I got on it and completely broke the #*$&@ end loose. Thinking it was gravel I came to a complete stop and jumped on it, can you say smoke :shock: The engine had completely transformed and was now a raped ape. Apparently the tag on the engine was correct. Please explain what happened and why it now had balls? There wasn't a new chassis that needed to be broke in. Do you think maybe the engineers were right?? I personnaly believe an enine can gain HP once broken in. It only makes sense. Tolerances loosen up some, rings seat etc. And I can tell you from experiance it made made more power on that Chevy small block :ORC
 
pro116 said:
Kevin I'm saying you can dyno the engine newand at 500 miles,to 2000 miles and there is no hp increase.Why people think's it gets faster is the chasis is broke in.
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i would think as the chassis breaks in it becomes weaker...like rivets becoming loose and welds cracking
wouldn't the added vibration cause u to loose power like in the poo 900
 
every time car and driver does a long term test on a vehichle they take it to the drag strip and check the fuel milage when new.then they do it again 5-10 thousand miles later.evry one of these i read the vehichle was quicker in the quarter and got better fuel milage.that is from every thing wearing in,drive train and chassis.
 
snappy you are correct for the people that don't think so they should dyno their sled.It's a fact
 
pro116 said:
snappy you are correct for the people that don't think so they should dyno their sled.It's a fact
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pro116, may I ask what you do for a living to be so knowledgeable :ORC
You will gain HP! significant?? Not really, but in some cases a few more is all it takes :ORC
 
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