Haflinger Engine Tune
Posted: Thu Feb 21, 2019 9:45 pm
This follows on from here posting.php?mode=reply&f=7&t=11706 but is a different issue so new thread.
The engine is 762cc and with the standard NDIX Carb normally runs really well except for the minor idle issue when hot mentioned in the link.
The vehicle will pull 90kph flat out when tuned but had been loosing a little in top speed and pulling power down and a slight increase in fuel consumption- time for a tune. It has a Petronix ignition and I only use the paper air filter.
New plugs, reset timing, new airfilter and reset tappets. Carb had a complete rebuild a few years. I dismantled it and cleaned everything (was all clean) and no settings changed from previous. accelerator pump on the same settings.
Now the vehicle starts first go and now idles OK. Up to around 3000rpm it drives fine but if floored in the lower gears power seems to cut out with higher revs. (no governor). On the road it drives Ok but if you put the accelerator down the engine seems to load up and loose power but if you back off a bit it clears itself and is Ok until you put the foot down. It acts very much like it did have a governor and it was kicking in when the accelerator is forced down. (it is not like an accelerator pump issue - more like a governor kicking in) Slow applications of throttle do not cause the issue.
Open to suggestions from the experts on these engines.
Thanks
Garry
The engine is 762cc and with the standard NDIX Carb normally runs really well except for the minor idle issue when hot mentioned in the link.
The vehicle will pull 90kph flat out when tuned but had been loosing a little in top speed and pulling power down and a slight increase in fuel consumption- time for a tune. It has a Petronix ignition and I only use the paper air filter.
New plugs, reset timing, new airfilter and reset tappets. Carb had a complete rebuild a few years. I dismantled it and cleaned everything (was all clean) and no settings changed from previous. accelerator pump on the same settings.
Now the vehicle starts first go and now idles OK. Up to around 3000rpm it drives fine but if floored in the lower gears power seems to cut out with higher revs. (no governor). On the road it drives Ok but if you put the accelerator down the engine seems to load up and loose power but if you back off a bit it clears itself and is Ok until you put the foot down. It acts very much like it did have a governor and it was kicking in when the accelerator is forced down. (it is not like an accelerator pump issue - more like a governor kicking in) Slow applications of throttle do not cause the issue.
Open to suggestions from the experts on these engines.
Thanks
Garry