October 16th, 2016, 11:00 AM | #1 |
ninjette.org member
Name: geno
Location: granite city
Join Date: Oct 2013 Motorcycle(s): gsxr 750, sv650, 250 ninja Posts: 110
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51 hp 300 went boom, graphic pics inside
all dynos are different so for reference our stock motor made 36 hp on pump and 40hp on mr-12, our built motor made 47hp on pump and 51hp on mr-12 on the same dyno which always reads 3hp lower than most others, 300 was wide open down back straight at NCM then boom, broke both rods and everything else you can think of, oh well
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October 16th, 2016, 11:37 AM | #2 |
The Corner Whisperer
Name: Chris (aka Reactor)
Location: Northern KY
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oh snap!
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October 16th, 2016, 12:01 PM | #3 |
ninjette.org member
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Location: PORTO
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really bad luck
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October 16th, 2016, 12:19 PM | #4 |
sammich maker
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Location: West Ohio - in the kitchen
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2nd time I have seen this.
A member on another forums engine blew on the highway. His was covered under warranty, the piston wasn't installed correctly in his motor. He had less than 2k miles.
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October 16th, 2016, 12:37 PM | #5 |
ninjette.org member
Name: geno
Location: granite city
Join Date: Oct 2013 Motorcycle(s): gsxr 750, sv650, 250 ninja Posts: 110
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far from stock here, got 3 good weekends, no warranty in racing
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October 16th, 2016, 01:02 PM | #6 |
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I bet it was fun with 50 ponies!
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October 16th, 2016, 01:27 PM | #7 |
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October 16th, 2016, 01:53 PM | #8 |
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October 16th, 2016, 02:31 PM | #9 |
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I want 50hp... I don't wanna blown motor though. I bet you had a blast while it lasted
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October 16th, 2016, 02:53 PM | #10 |
ninjette.org member
Name: geno
Location: granite city
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stay around 46hp we went for broke, and got it
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October 16th, 2016, 02:55 PM | #11 |
Cat herder
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This is why we can't have nice things.
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October 16th, 2016, 03:01 PM | #12 |
Gear crash test dummy
Name: Max
Location: South Bay (So. Cal)
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Usually when people "blow the motor" it's actually just one part that is broken and causes a loss of power. You, on the other hand...
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October 16th, 2016, 05:51 PM | #13 |
n00bie to wannabie
Name: Bill
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No picture of the riders shorts?
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October 16th, 2016, 06:04 PM | #14 |
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The cam chain tensioner seems ok.
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October 16th, 2016, 06:43 PM | #15 |
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October 16th, 2016, 06:59 PM | #16 |
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This is very confusing to me. I make more than 50 hp with a 250cc engine. I have spent many hours and made dozens and dozens of dyno runs and many one mile passes. I have never just snapped rods. If it was an oil problem the rods would have broken at the bearing. Or if it was excess heat the bolts would have broken and the rods would show blueing.
But to just snap rods is something I have never seen. Are those forged pistons? What oil are you using? How are the valves? This is something you should get to the bottom of.
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October 16th, 2016, 07:11 PM | #17 |
ninjette.org member
Name: geno
Location: granite city
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oil was fine
j&e pistons a couple valves bent head dosent look damaged cct is good ill check into it soon but answer my not come as bad as it's destroyed |
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October 16th, 2016, 07:47 PM | #18 |
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Name: Sean
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Rider ok? presumably alex.
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October 17th, 2016, 04:52 AM | #19 |
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I would like to see the parts laied out. Is the pin still in the number two rod small end? Next I would look at the bearings.
With a failure like this I would look at the chain of events. What started the failure? The engine history. How many miles when was it modified? How much time on the modified engine? You had it full pin on the back streight. Did it over rev? What sounds do you recall?
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Top speed 123.369mph. Ohio mile Worlds fastest 250 ninja |
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October 17th, 2016, 08:11 AM | #20 |
Fighting Texas Aggie '05
Name: Neil
Location: Hutto, TX
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I always find these threads quite enlightening. Stock rods? Looks like it. Any reason on a build going for broke you kept them instead of putting in something more substantial?
Is there a build thread I didn't pay attention to? If not could you post build specs? That is one pretty significant failure so there certainly must be some things we can learn.
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October 17th, 2016, 08:19 AM | #21 |
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I have never seen a stock rod fail like this. Except when oil sloshed up onto the bottom side of the piston.
This comes from breaking hard at high RPM . The oil sloshes up and the piston stops. This will cause the rod to snap or pull the pin out of the piston.
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Top speed 123.369mph. Ohio mile Worlds fastest 250 ninja |
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October 17th, 2016, 09:42 AM | #22 |
ninjette.org sage
Name: bruce
Location: northern illinois
Join Date: Jan 2012 Motorcycle(s): Race bikes:08 Ninja 250,11 R6,16 ZX6,SV650.3 HD-1947,2-2003,2010. 1946 Indian and a lot of dirt bikes.2 Posts: 999
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Dib's on the crank
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October 17th, 2016, 02:51 PM | #23 |
ninjette.org sage
Name: John
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Damn, the carnage!
Curious about what your build consisted of.
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October 18th, 2016, 07:07 PM | #24 |
Board Member
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Dang. I have the same questions as everyone else. Please let us know what you find and what your build was made of.
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October 19th, 2016, 08:48 AM | #25 |
Cat herder
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Stuff of insufficient strength, evidently.
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October 19th, 2016, 09:03 AM | #26 |
Rev Limiter
Name: Jay
Location: WI
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That's more than a 40% increase in HP from the stock numbers, so it is asking quite a bit from the stock rods and crank.
Some engines can take that, and more, but not the little Ninja from the looks of it. It looks like the MR-12 is good for a 10% increase - did you rejet or run the same jetting as on pump gas? Bruce is close to 48 HP, and running it this weekend. We'll see his does at that level. |
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October 19th, 2016, 10:51 AM | #27 | |
Board Member
Name: ...
Location: WI
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Quote:
I am interested in this build because of the output of both HP and the boom. 51HP is nice.... |
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October 19th, 2016, 11:17 AM | #28 | |
Rev Limiter
Name: Jay
Location: WI
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Quote:
I would say that's a good call if you are getting in that range. I assume they would be lighter as well as stronger. |
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October 19th, 2016, 11:26 AM | #29 |
Board Member
Name: ...
Location: WI
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Carrillo makes rods for the 250. Not sure about the 300 but I would assume so.
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October 19th, 2016, 11:35 AM | #30 |
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They are sweet
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Top speed 123.369mph. Ohio mile Worlds fastest 250 ninja |
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October 19th, 2016, 02:42 PM | #31 |
ninjette.org member
Name: geno
Location: granite city
Join Date: Oct 2013 Motorcycle(s): gsxr 750, sv650, 250 ninja Posts: 110
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the engine has the following work
ported head 13-1/2 to1 j&e pistons spears cam motor was mapped separate for pump and mr-12 motor had 1200 street miles when built we ran 6 - 25 min gt races and a handful of practice sessions some on 93 pump gas and some on u-4.4 on this motor ran good, ran mr -12 in our other stock motor with no issues more power and much better acceleration to redline for this last weekend we really wanted to put a hurtin on the local ktm guys that we were barley beating on the pump and u4, so we put in the mr-12 and mapped accordingly and got our best numbers to date, rider said motor was ticking in practice I was not there to listen, he ran 2 sessions, then motor popped 1 an1/2 laps into race bike was flying pulling away the #2 piston is the one I think came apart first, pulling the pin out and sawing the cases, I have no clue why or how #1 rod broke #2 piston had very minor seize marks nothing that makes me think that it locked up causing piston to come apart ill pull the crank out this weekend and investigate further bruce is using modified zx6 rods capable of much higher strenth |
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October 19th, 2016, 02:48 PM | #32 |
ninjette.org member
Name: geno
Location: granite city
Join Date: Oct 2013 Motorcycle(s): gsxr 750, sv650, 250 ninja Posts: 110
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it kinda looks like maybe the rod pulled the piston pin out first then beat the hell out of the under side of piston then sawed thru the cases then broke your guesses are as good as mine at this point
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October 19th, 2016, 03:53 PM | #33 |
#squid
Name: nickypoo
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Nope! Assuming he did some engine work! So it's not totally surprising she went, still unfortunate! Good luck OP! Good thing these are cheap!
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October 19th, 2016, 04:04 PM | #34 | |
Board Member
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Quote:
As for cheap, I would not say that once you start putting in the time and money like some of us. Speaking of HP....I still owe y'all a dyno....dammit |
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October 19th, 2016, 05:03 PM | #35 |
ninjette.org member
Name: geno
Location: granite city
Join Date: Oct 2013 Motorcycle(s): gsxr 750, sv650, 250 ninja Posts: 110
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heres all the damaged internals, heads shot, crank is ok
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October 20th, 2016, 01:24 PM | #36 |
ninjette.org sage
Name: bruce
Location: northern illinois
Join Date: Jan 2012 Motorcycle(s): Race bikes:08 Ninja 250,11 R6,16 ZX6,SV650.3 HD-1947,2-2003,2010. 1946 Indian and a lot of dirt bikes.2 Posts: 999
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Im helping a friend set up his Dyno next week. Come on down I need a test mule!
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October 20th, 2016, 01:26 PM | #37 |
ninjette.org sage
Name: bruce
Location: northern illinois
Join Date: Jan 2012 Motorcycle(s): Race bikes:08 Ninja 250,11 R6,16 ZX6,SV650.3 HD-1947,2-2003,2010. 1946 Indian and a lot of dirt bikes.2 Posts: 999
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October 20th, 2016, 03:02 PM | #38 |
Board Member
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October 23rd, 2016, 10:10 AM | #39 |
ninjette.org sage
Name: bruce
Location: northern illinois
Join Date: Jan 2012 Motorcycle(s): Race bikes:08 Ninja 250,11 R6,16 ZX6,SV650.3 HD-1947,2-2003,2010. 1946 Indian and a lot of dirt bikes.2 Posts: 999
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October 23rd, 2016, 09:38 PM | #40 |
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