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Post by Tobyjugs on Feb 21, 2016 20:42:49 GMT 1
Don't know if anyone is following my thread about my engine, but i was surprised that in the standard 4L0 01 carbs i have put 430 main jets in my carbs and they are still too small,
The engine has ypvs barrels which has been re-sleeved to make it 392cc running standard 4LO ignition with new pipes of unknown dimensions (special made)
I know the above mention re-sleeving is not the best way to go so don't need to be told that but i would like it if a few of you chaps out there could comment on what size jets and state of tune you are running
Cheers Tobyjugs
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Post by rigga on Feb 21, 2016 21:02:52 GMT 1
430 ?? Is that a missprint
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Post by wallcraft on Feb 21, 2016 21:13:08 GMT 1
Ok my 4lo has 98mm banshee sleeves which was engineered very successively, I to was surprised at the size of jets I ended up with.
Mains 420
Pilots 32
Ramairs
Zeel
Allspeeds
The bike ran very well indeed although had the usual 5000-5500 rpm flat spot that I could live with
Some people would instantly say the jets were way over the top, but in the real world away from the dyno flat out for 1.5 mile against a slight head wind or up hill it's not going to burn its self up! I also use a TZ high flow fuel tap to be sure against fuel starvation at WOT.
P.s thanks again for the free revy.
Mark.
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Post by Tobyjugs on Feb 21, 2016 21:22:07 GMT 1
430 ?? Is that a missprint No miss print they will be bigger Thanks for the info wallcraft |
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Post by midlifecrisisrd on Feb 21, 2016 21:25:02 GMT 1
430 does seem large but if that's what it needs then that's that.
Personally I would change the std 4l0 ignition to a zeel or ignitech
The poor advance can't be doing it much good with ypvs cylinders.
Would think that would affect the burn
Steve
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Post by 4l04ever on Feb 21, 2016 21:53:06 GMT 1
What air filters are you using?
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Post by Tobyjugs on Feb 21, 2016 22:45:24 GMT 1
Its running Ram air filters, got an ignitech made up waiting to fit it. First i want to get fuelling right then fit the ignitech, just so surprised it needs such big jets its also running on premix.
Really thought that when the Lomas pipes were changed i thought it would need jetting down not up.
I will get a dyno readout on Tuesday and if there is enough time the ignitech might be fitted as well.
Good point Steve but the ignitech will sort this out
The tuner did not complete the first run because he heard it pinking, me being a little stubborn insisted on checking a plug. The jets went from 400 to 430 and there still too small. One of the first thing that went through my mind was ignition timing. Will know more on Tuesday, The bike is still strapped on his dyno so no chance to check static timing.
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Post by 4l04ever on Feb 21, 2016 23:28:05 GMT 1
You will be at 400+ with ram air filters and standard carbs. They flow a lot more air than standard air boxes.
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Post by wallcraft on Feb 22, 2016 0:09:03 GMT 1
You will be at 400+ with ram air filters and standard carbs. They flow a lot more air than standard air boxes. +1 Just the same as running open mouth . Keep us posted. |
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Post by Tobyjugs on Feb 22, 2016 14:05:15 GMT 1
You will be at 400+ with ram air filters and standard carbs. They flow a lot more air than standard air boxes. +1 Just the same as running open mouth . Keep us posted. Hi wallcraft your basic engine set up sounds simular to mine do you know what kind of torque and power it is making? I will post up my findings. I'm just so surprised the jetting has jumped up so much from the lomas pipes. Its also using reamed out 27.5 pilots as i had nothing bigger at the time. |
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Post by Tobyjugs on Feb 24, 2016 0:10:49 GMT 1
Just come back from the dyno, it turned out it was pinking due to the volume of the combustion Space's being too small.
It worked out to have a compression ratio of 16:1 uncorrected which is a bit high.
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Post by 4l04ever on Feb 24, 2016 12:06:47 GMT 1
Hopefully you found the issue with the too high compression before you broke anything,,,,
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Post by Tobyjugs on Feb 24, 2016 14:45:35 GMT 1
Hopefully you found the issue with the too high compression before you broke anything,,,, Your right. This engine has only been on the dyno apart from a bit of pootling around to check chassis mods. I removed the head and put a light smeer of grease around the ring to ensure a good seal put the head on and measured the volume.nothing to see on head or pistons. This is when a O-ringed head is very handy I will put some pictures up when i get the bike back Question is how to go further? probably renew hacked up pistons use standard base gasket and re-profile everything to these two things. |
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