Adjusting fuel delivery Hatz 1B40

[Sphere]

Does anyone have hands-on experience with adjusting the fuel delivery on Hatz engines? I know Darren has a 1B30, but it would be neat if someone knows of the procedure with the 1B40? Somewhere there is a vague memory of Stu telling about a mate that jas swapped his injector for a 5-hole version and experienced better power, and also Sommer allegedly added a gasket and retunes the engine afterwards?

Much faster than 80km/h in 4th gear doesn't seem feasible except for downhill, or backwind. Is Sommer twisting the truth when he states his bikes will do 99km/h?

[Sphere]

Apparently this is the screw, procedure is still unknown to me. I was warned I will easily destroy the engine with incorrect adjustment.

[pietenpol2002]

The Sommer Hatz is undoubtedly benefiting from the new rate shaping nozzle injector, in addition to the fact that they're spinning them up to 4,000 RPM's. May well be the basis for the Sommer claim of 99km/hr. It does cause you to wonder whether one could simply plug a new RSN injector into the hole and dial up the governor. It's rarely that simple.

[Sphere]

The Sommer Hatz is undoubtedly benefiting from the new rate shaping nozzle injector, in addition to the fact that they're spinning them up to 4,000 RPM's. May well be the basis for the Sommer claim of 99km/hr. It does cause you to wonder whether one could simply plug a new RSN injector into the hole and dial up the governor. It's rarely that simple.

Hi Ron, from what I understand the new RSN injector was mainly for environmental purposes. Also, in my mind there is no point in dialing up the governor if the engine isn't rev'ing past 2600-3000rpm in 4th gear.

http://www.hatz-diesel.com/uploads/medi ... ozzles.pdf

[XLerate]

One major advantage to raising governed rpm is with a manual transmission, where the ratios between gears aren't in a proper progression. Some of the gearboxes will have gaps, with maybe 2nd gear too low geared, and 3rd gear too high geared. Twisting up the governed speed helps to rev out higher in 2nd to fill in the gap between gears. This is for vehicles without a 'close ratio' gearbox, helps a whole bunch!

[Sphere]

Well, downshifting from 4th to 3rd does sometimes locks up the rearwheel. Quite scary... probably also has to do with not being able to control the clutch well enough.

[XLerate]

Yes, my first bike wreck was over 30 years ago, on a Honda race bike. I was used to the British gear pattern of 1 down, N-2-3-4 up. First ride on the Honda. Wound out this Honda 1st-2nd-3rd to about 14,500 then power-shift 4th. Unfortunately my brain thought British and I hit 2nd instead! Locked up the rear at about 85-90 mph, skidded off the track onto the apron and across a dirt field kept it upright, didn't go down!]and through a very stout wooden fence head first.

In the prior post I was talking about the progression of upshifting through the gears, and a having very long reach between certain gears when a gearbox is not close ratio. There a higer rpm governor spring in injection pump allows engine to rev higher, to make up for the gear ratios that are too widely spaced. Makes all the difference in the world.