sooty
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| posted on 14/3/11 at 07:22 PM |
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quote:
Originally posted by jacko
Use a timing strobe light and check it is advancing to 34-36% at 3000rpm-3500rpm
Jacko
Doing this check, is this with the Vac disconnected or connected. ??????
OK I've read 'Dave Andrews' bit about modding the Dizzy and states to check advance without the Vac connected.
But if the springs were too strong or too weak on the mechanical advance.
Where would I get some springs.
thanks
[Edited on 14/3/11 by sooty]
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jacko
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| posted on 14/3/11 at 08:27 PM |
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quote:
Originally posted by sooty
quote:
Originally posted by jacko
Use a timing strobe light and check it is advancing to 34-36% at 3000rpm-3500rpm
Jacko
Doing this check, is this with the Vac disconnected or connected. ??????
OK I've read 'Dave Andrews' bit about modding the Dizzy and states to check advance without the Vac connected.
But if the springs were too strong or too weak on the mechanical advance.
Where would I get some springs.
thanks
[Edited on 14/3/11 by sooty]
With the vacuum pipe off / disconnected
What you need is a timing strobe lamp that can be justed so you can see if its making 36% at 3500rpm if not adjust the dizzy so it is .
Then let the engine tick over and see what it is 10% -12% is about right
If it's hard to start the engine retard the dizzy a little
Jacko
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sooty
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| posted on 14/3/11 at 08:49 PM |
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OK Thanks
Just done a check.
First set the timing to 12degs.
Then using a vernier measured TDC to 10deg then measured in increments across to 30deg.
Ran engine again to 3.5/4K rpm and timing is short of approx 2/3degs, suggesting springs are too strong. I can move the rotor freely against the
springs suggesting the mechanical advance plate is free.
Will road test tomorrow for any improvements.
So where can I get weaker springs or any other tips of how to mod dizzy.
Or should I set the advance at 3.5/4K rpm to 36 degs and not worry about the timing at tickover speeds etc.
thanks again.
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jacko
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| posted on 14/3/11 at 09:42 PM |
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quote:
Originally posted by sooty
OK Thank
Or should I set the advance at 3.5/4K rpm to 36 degs and not worry about the timing at tickover speeds etc.
thanks again.
Thats what i did but it only just started so retarded the timing a small amount and it started ok
Jacko
ps where do you live ?
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sooty
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| posted on 15/3/11 at 11:15 PM |
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Hey Jacko, your the man
Set the dizzy to have approx 33deg advance at 3.5/4k rpm and it revs to 5k plus without any splutter or spit back. But the advance at tickover is
showing to be approx 15deg and starts OK at this.
Should I leave it at that or modify the Dizzy with weaker springs, but where can I get these springs.
The problem now is that as before it back fires alot on overrun, as said before the main jets fitted by the previous owner is 155 primary and 140
secondary. Again the Haynes says these should be 130 for both chokes.
Any suggestions about the backfire and jets
Thanks
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