How rich is too rich and what was the HCo (?) reading when set up on the
dyno?
I know jets aren't cheap but neither is dyno time so I'd drop the mains
down one size at at time test and repeat. With the idles it's harder to say
but
again one size at a time. I'd leave the air correctors alone as I'd expect
the enrichment curve requirement is the same but starting from a different
point.
I see Ron has said to change the timing and fit a softer plug. I definitely
don't see a reason to fit softer/warmer plugs and most definitely knot 2
grades. I don't see a reason why the timing ought to change but it's not
something I'd mess with.
Weslake-Monza 1330
In a message dated 23/03/2009 14:33:40 GMT Standard Time, breton48@live.com
writes:
This is LBC but not Spridget content. I hope some kind soul here will answer
with the right kind of information - no one did on the Lotus 7 list I belong
to. Below is the message I sent:
Hi... I have a lotus Seven S4 Twin cam, which was jetted on a dyno at sea
level three years ago. I now live at 7400 feet, and all my driving is done
above 6000 feet. The engine is running too rich. Any suggestion for
rejetting and should I retard the timing?
Here is what I have now:
1970 Lotus Seven S4 Twin Cam, 1558 cc (+20 thou overbore), compression
10:1.
Twin Weber DCOE 31 carburetors. Chokes: 32 mm
Cyl 1 Cyl 2 Cyl 3 Cyl 4 Standard Twin Cam SE
specification
Emulsion Tube F11 F11 F11 F11 F11
Main Jet 115 115 125 120
115
Idle Jet 45F8 45F8 45F8 45F8
50F8
Air corrector 155 155 155 155 150
Timing: 25 degrees at idling, 35 degrees at 4000 to 4500 rpm
JLC in the Black Forest, CO.
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