- Fourth Gear
- Posts: 943
- Joined: 20 Jan 2013
- Location: West Sussex
Pertinent info reposted (with acknowledgement to Tim Engel) :
Float ...... Float
Weight ... Height
10 gr ...... 16.5-17.0 mm
8.5 gr ..... 15.5-16.0 mm (Lotus calls for 14.5-15.0 mm = 1.0 mm higher = richer)
7.0 gr ..... 14.5-15.0 mm
By the way, Des Hammill gives one float height for all float weights... 15.0 mm. I suspect you'd have to do a little additional tuning to make that work universally. I always use the engine manufacturer's spec, and drop back to the three settings given above if the mfgr's spec isn't available. With Lotus, I also presume their setting will be 1.0 mm higher than the Dellorto default (that presumption works on the 907 & 912 as well).
A heavier float naturally rides lower in the pool. So for a given fuel level, a heavier float will be lower = larger number. Conversely, a lighter float will be higher = smaller number. So, in the pursuit of one correct fuel height, all three of the above standard weight & height combinations should produce the same standard fuel level.
Note that for the 8.5 gram float used with the Twin Cam, Lotus specifies a 1 mm higher float height, which will give a 1 mm higher fuel level, and an overall richer condition in the carb. If you wish to tune your engine the way Lotus set it, then use Lotus' specs, and not generic Dellorto specs.
- Coveted Fifth Gear
- Posts: 1615
- Joined: 08 Oct 2003
- Location: UK
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