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Post Info TOPIC: Camshaft Pin position


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Camshaft Pin position


Hi guys

 

been using ecu editor for a while and replacing the UK maps with US ones to remove the lambda.I now have a particular bike which seems very sensitive to the cam position sensor pin been in the correct place.

I have fitted a K8 crank and a new camshaft into a K7 some which we have done  few of.

the problem I seem to have is the single "1st" initial injector batch fire (all 4 at once) on startup cranking is present in a very very small window of cam timing on this particular bike.

I want to modify the cam timing but when I do the window closes and the batch fire does not happen.if I move the pin the other way too far the engine rev limiter cuts in early.

so my question is; can I modify the ignition timing to accept the new pin/cam timing position in ecu editor.

 or do two wrongs not make a right .(I this I think is an important question.)

I have never had this problem before and appear to be working in a small 5 degree area.

 

cam timing is currently 103 any more (like 106/107) and I lose the batch fire.If I modify the pin forward (much modified brocks K8 pin) I can move the cam rearwards (currently from 103 to 106)

anyone any ideas please as this is very strange or maybe amplified because its a stroker and I am thick.biggrin

oh and the power is fluctuating on the dyno with the pin position.(which is to be expected as the ecu reads the different position signals) I changed the pin position but kept the cams in their origional place.

normally I flash the ecu and stick the cams where I want them and all is ok .this one is a very temprimental cow.

sorry Its a rambling post but some of this may be relevant. especially if the software has been changed for some reason in that area.

smile

-- Edited by JOHN DYNOSTAR on Tuesday 28th of February 2012 09:06:14 AM



-- Edited by JOHN DYNOSTAR on Tuesday 28th of February 2012 09:07:17 AM

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Guru

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Checked your pin installed height ??
or replaced the cam sensor ?
Not sure its relevant but had a low pin on one bike that stopped it revving , disconnected the sensor after startup and it was fine
Good luck with it , sounds like a PITA

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thanks for the reply

yes ,I have changed the sensor and tried the height  cry



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Any change the crank trigger is the problem? Check out the magnet on the crank sensor to be sure it doesn't have debris stuck to it.

If you have an oscilloscope, check out the crank trigger verses cam signal.

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Hi sportbikeryder

we did try replacing the complete cover and pickup off another bike in case that was the problem.



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Man...that is an odd one. Normally the intake cam can go to about 110 without any hiccups.

Any chance teh key on teh rotor has started to shear and moved the clocking location of the crank rotor? I have never seen that on a busa, but at this point, anything is possible I suppose.

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ahead of you there too. pulled the rotor off and checked that one.

going to fit a stock ecu and see what happens smile



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well

I ended up adjusting the ignition map 2 degrees to match the stock ecu

I checked on idle and fast idle with both ecu's



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Change the dwell ??

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