Posted by Glen on 8/27/2007, 7:50 am, in reply to "HS6 Needles" --Previous Message--
72.153.88.61
The state of tune, cam, compression, intake & exhaust, etc will dictate needle requirements. The BDQ is a relatively lean needle spec. Does it show other signs of running lean?
Have you checked your advance curve? You could be getting too much advance at a certain point ie it's coming in too quickly for that engine speed. The curve is controlled by the vacuum units & the mechanical counterweights in the distributor.
FWIW I usually run just mechanical advance. You adjust the curve by changing the springs & you can mod the full advance by welding/grinding the advance stop. Remember 1 degree in the distributor = 2 crank degrees.
Sorry I didn't answer your question
Glen
: I would appreciate any information on
: needle sizes that are successfully
: being used on a 2 litre GT6. I am
: using size BDQ and it pings at
: 3000rpm in 3rd and 4th. I have
: already retarded the ignition all
: that I am willing.
:
: Thank you!
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