Moorron
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 posted on 23/1/09 at 09:41 AM |
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ZX12 on the road
As it’s a Friday and many wont be working hard (Come on be honest!) I thought I would congratulate myself and also thank those who guided me thru my
engine transplant over the xmas period. Last night I ran home before it got dark to get the car out of the garage and try it on the road. With only 2
litres of fuel in the tank I wasn’t going for so staying in the estate I wanted to check 4 things.
1, how did the clutch work as its stupidly light under my foot and I thought controlling it would be hard.
2, Same with the throttle
3, would any of my devices using the speedo pickup fitted to the engine get a decent signal
4, how FAST!
First of it pulled off with ease of my drive, minimal revs and it didn’t jump or stall (last engines clutch was like a switch either on or off meaning
it would spin the wheels or stall). Clutch-less gear changes are just as easy with this engine. But what was a huge problem it trying to maintain a
constant speed when at a set throttle position. I found I was bunny hopping up the road unless I was decelerating or accelerating and I can only put
this down to the throttle being to light and been effected by my foot movement when under vibration. Think I have sorted this by adding an additional
spring.
Both Speedos were moving without flickering, but the one which I had to work out the calibration number is reading about twice the speed it should,
again I think I have this sorted as when I worked out the pulses per Km I should have done it for miles which was almost twice the amount. Might get
to check it with my gps in the morning.
I was loosing traction a lot but its not the stickiest conditions up the road but later on I thought I would see what max revs I got to in the short
distance I travelled and to my surprise I had only got to 8000rpm! “just in the power band”.
Really happy, just some small water leaks to sort, and some alloy plates making up to cover on the scuttle area and we are all go. Oh forgot to
mention I bought a new sump to shorten and baffle sometime in the next week before I knock the old one off.
Cheers
Andy
Sorry about my spelling, im an engineer and only work in numbers.
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Hellfire
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| posted on 23/1/09 at 12:34 PM |
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The hunting and bunny hopping you report are more likely to be down to incorrect engine tuning for whatever exhaust you are running. The engine is
sensative but it doesn't do it on the bike with taller gearing so it shouldn't do it in the car.
Deffo - get that sump reworked ASAP. Although it will be better for the engine it wont be if you tw*t a sleeping policeman (c'mon, suggestions
lads!)
The power curve on the ZX12 is so flat it hardly has a power band!
Have fun, but dont go daft with the Ice Rink Roads we have ATM....
Steve
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Moorron
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| posted on 23/1/09 at 01:59 PM |
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cheers, Im sure it was my foot moving in the pedal due to the lurch forward which caused my foot to 'back off' and then me lurch forward
and so on. But yes the fueling must be off and it is one of my next road test to set up my LC1 and see whats going on. Im just using a
'zerp' map on the powercommander at the moment but that wont stay like that for long.
Sorry about my spelling, im an engineer and only work in numbers.
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BenB
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| posted on 23/1/09 at 06:35 PM |
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Yup. bunny hoping can be due to being "thrown" forward under deceleration causing pressing on gas which causes to come off the gas etc
etc.
All to do with the G-forces  I sometimes get it when I'm driving though if I make myself concentrate and tense the calf muscle I can get it
under control again.
there's probably some equation somewhere to do with resonant frequencies and stuff like that you can use to work it out. Otherwise a stiffer
spring might help. Personally I just put up with it it's pretty rare and I like a fairly light throttle for long distance driving..... Anyway,
once going more than 5mph it stops being a problem....
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