Stromberg Needles
Posted: Mon Jul 05, 2004 1:06 pm
I have just had the cylinder head reconditioned for my +2 twin cam, with new valves, guides and seats. At the same time,
I had my standard cams replaced by CPL2 cams - roughly equivalent to Sprint cams, I believe. With the extra air flow through
the engine, I though that new needles would be in order, so I askes Burlen Fuel Systems for their advice, and they
recommended the B2AF type instead of my original BIG type.
After trying out the new needles, there seemed to be a little more power, but I found a flat spot at around 3500 rpm.
I have tried everything to eliminate this, but can only do it by going back to the old needles.
This seems strange, because the B2AF needles have a thinner profile to give you a richer mixture. The flat spot
(I thought) would be due to too lean a mixture!
Using a colourtune on both needles does not reveal anything (looks OK).
Has anyone had a similar experience? Any ideas?
Dave Chapman.
I had my standard cams replaced by CPL2 cams - roughly equivalent to Sprint cams, I believe. With the extra air flow through
the engine, I though that new needles would be in order, so I askes Burlen Fuel Systems for their advice, and they
recommended the B2AF type instead of my original BIG type.
After trying out the new needles, there seemed to be a little more power, but I found a flat spot at around 3500 rpm.
I have tried everything to eliminate this, but can only do it by going back to the old needles.
This seems strange, because the B2AF needles have a thinner profile to give you a richer mixture. The flat spot
(I thought) would be due to too lean a mixture!
Using a colourtune on both needles does not reveal anything (looks OK).
Has anyone had a similar experience? Any ideas?
Dave Chapman.