2000redrocket
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posted June 27, 2010 06:13 PM
the rocket may be slowing down
well the track has been dead up our way every friday and i killed the clutch. but i got a last pass clean with a 1.58 60ft and only a 9.65 et. it was a 1550AA day. that should of been mid 9.5s.
i am going to take it apart and give the valves a look and do a leak down. we have a 3 week break so now is the time.i my self think something is going on. it has 11,000 mi of hard drag racing every friday i can make it.
what kind of leak down numbers are go and no go?
  
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dougmeyer
Needs a job
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posted June 28, 2010 12:18 PM
What is the parts combination?
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2000redrocket
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posted June 28, 2010 01:52 PM
well it is stock engine with a muzzy ti system on it and advancer at 2 deg or so advanced.
i guess a good question besides leak down numbers is stock engine average cranking compresion.
last year in this weather i would be 145 or a bit more at the same track.i could run 9.65 short with 16/44 gearing.with a lower 1.6 60ft.
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tshultz
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posted June 28, 2010 06:17 PM
i guess a good question besides leak down numbers is stock engine average cranking compresion.
mine was at 175psi
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2000redrocket
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posted June 28, 2010 06:35 PM
i will remember that todd. sorry for not calling. been busy. can you come out one night we can drink some and work some. the shop is still 77 deg F so it is nice inside yet.
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dougmeyer
Needs a job
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posted June 28, 2010 07:53 PM
160-180 is about the range I'd like to see with a warm engine, good battery and the throttles open in good air. I'm pretty sure the book shows a much wider "usable range" than that. To be get a really reliable number measure it in the evening or as close to 60F OAT as you can get.It makes a difference. I would expect to see less than 5% leakdown on a healthy engine and wouldn't be surprised to see 2-3%. If it's higher, make sure you rule out leaky exhaust valves before pulling the cylinder.
Doug
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2000redrocket
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posted June 29, 2010 03:17 PM
thanks doug. i will get back with the findings.
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Shane661
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posted June 29, 2010 03:45 PM
quote:
well the track has been dead up our way every friday and i killed the clutch. but i got a last pass clean with a 1.58 60ft and only a 9.65 et. it was a 1550AA day. that should of been mid 9.5s.
i am going to take it apart and give the valves a look and do a leak down. we have a 3 week break so now is the time.i my self think something is going on. it has 11,000 mi of hard drag racing every friday i can make it.
what kind of leak down numbers are go and no go?
If you know the clutch is gone, I wouldn't worry about it. I pulled a great 60' and went 14 seconds in the 1/4 on Racheal's 1000....clutch was toast.
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2000redrocket
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posted June 29, 2010 03:57 PM
shane this has been going on for the spring. it seems off 2 mph all the time less et. i will be ok with it if i have to but i have been running this bike a long time and i could get a mid 9.6 when i was short and 16/44 and a mid 1.6 60ft. heck at cecil i had a cooler spring day slowest pass was a 9.48@147. that seems un obtainable now.
also a excuse to take the bike down and clean the oil pan and check the valves and leak down it. if there is nothing wrong so be it but this is not what i remember. and in the end if it is back to running good with new clutch that will be good also. i just have to look.
how has your 12 been shane? run it yet?
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Shane661
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posted June 29, 2010 04:03 PM
I haven't made any clean passes on the 12 yet...it is running good, though.
I doubt your motor has issues, unless it went south since last November. 
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tshultz
Zone Head
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posted June 29, 2010 06:20 PM
quote:
i will remember that todd. sorry for not calling. been busy. can you come out one night we can drink some and work some. the shop is still 77 deg F so it is nice inside yet.
sounds good just call.
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2000redrocket
Pro
Posts: 1662
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posted June 30, 2010 02:40 PM
well i found the first thing. a 5mm bolt fell out of a plug that was plugging the air box clean side. so there is a ram air leak there.
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2000redrocket
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posted June 30, 2010 04:56 PM
the valve clearence at 16,000 is good.
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2000redrocket
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posted July 01, 2010 03:37 PM
well we did the check today. it is 225 to 235psi@ 73F cold engine. i am done running regular gas.
doug i know you you said to do it hot but i always do it cold and most of the things i seen the cranking pressure rises higher when warm.
what do you think doug?
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zx12dak
Expert Class
Posts: 103
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posted July 09, 2010 03:53 AM
Funny... seat of the pants I think my 12 has lost a bit also. Thinking of doing a compression test and maybe replace valve springs cause I tend to rev the crappy out of it. Mine is just turning 30,000 miles. Have you thought of valve springs?? I will be interested to see what you find.
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2000redrocket
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Posts: 1662
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posted July 09, 2010 06:01 AM
no i did not but everyone says they are on the week side. a friends car picked up with new springs after he had them checked for seat and open pressure and they were beat.
i have the bike back together now and am going to race tonight if no rain.
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entropy
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posted July 09, 2010 11:28 AM
2000RR
did you do a leak down????
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dougmeyer
Needs a job
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posted July 09, 2010 03:36 PM
I'd be plenty happy with that! It seems quite high. What was the procedure you used?
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2000redrocket
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posted July 09, 2010 08:22 PM
doug, i first did what you said a very long time ago by letting it go for a while cause you implyed it will still seal past 3000 mi not just the 2000 extended.
i had all the plugs out throttle pinned wide open with a snap on guage and the third hit it went over 200 on all. the first one may of got to 235 but joe stopped me cause he was getting skared and we were not seeing a problem there. i stopped turning the engine over when it was peeked or not worth turning over for the last little bit. (it was not like 30 sec per hole cranking time but more than 5 hits) for good or bad that is what i usually always do. cold wide open no plugs till it stops riseing.
so i am happy anyway everything seems healthy. new clutch works well and i think i am just bogging the engine by not really sliding the clutch out and hotter and less power makes it worse. i got a 1.59 60ft and only a 4.20 330 time.
i think it is time for the slider clutch. or i need to remaster the slide
ent after i seen the guage go past 200 on the third hit i decided it was sealed up enough to not bum the tool and a friend who knows how to do it well.
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shiphteey
Needs a job
Posts: 2529
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posted July 10, 2010 03:47 AM
Dennis, just a couple of thoughts.
1) Could you isolate the potential variablity of the timing lights being off? Have you tried a GPS to help see if you are down on MPH there too?
2) Can you run anyone (strip or roll-ons) that you know the outcome of and see if you reproduce the same results ... or if said punching bag is now locking with you or walking out on you.
Just a thought.
A.
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Topping out everything from Ninja 250s to nitrous ZX-14s.
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2000redrocket
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Posts: 1662
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posted July 10, 2010 05:31 AM
i do not want to say i have the fastest bike in town but i am the only person i personly know with a fast bike like a 12 or busa. genes zx9 would be a good punching bag but since he went to hershey to loose his job he is working all the time.
i think it is time to call NOX and put stuarts lockup in my bike just to see what happens.
i and my friend both took turns on my 12 last night and though he did not get a real good run being his second pass he came out soft somewat and could hear it load down. i have picked up the habbit of sort of throwing it out by the tree. i get great back to back 60ft times doing it but can not make my self slide it more. that is why i am thinking on the lockup with only 4 stock springs which will make it slide anyway due to not enough spring clamp and have the arms come in and do the rest. i think stuart said 3 stockers and throw it .
next time will be a fun day i bet. i will try to get my last runs log on here so you can see my sort of lame pull out.
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2000redrocket
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posted July 10, 2010 10:12 AM
 Edited By: 2000redrocket on 10 Jul 2010 18:15
here is a picture with the mark at a real good idea of where i rolled out of the beam
here is the mark at the 1.60 sec 60ft mark.even if i am off a couple of tenths i am no ware in the power.
also not how phat it is at the point i have the clutch all the way out and the bike at full load. that will not be hard to find in the A-N map.
also i took my bike from 12.6 afr to 13.2 afr and hardly any difference pointing to the afr change. that may change when i get it out better and i will be able to see power rise and fall with afr.
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