Al Gietzen wrote:

Chris/David;

 

. In our

installation the primary fuel injectors are in the 500 cc range, where

the secondaries are in the 1500 cc range

 

Do you really mean 1500 cc/min?  That’s huge. It could make tuning a bit difficult.

Yes. I REALLY mean 1500 cc/min.. or 150 lb/hr. Remember, we are planning to eventually turbo this engine, and its ported. 225-250 hp in the future is actually a goal, and I didn't want to get even close to a max duty cycle.

 

Here are some suggestions for getting mixture tuned based on my experience of re-tuning about 15 times, or more (remember the settings corruption problem I used to have?):

 

Get your coolant temp readout working.

 

Set mixture correction table to default (all zeros) if not already there. Read the manual again; modes 3, 6, and 9.  Also read again the EM2 manual about ‘Mixture Display’ and ‘Editing the MAP Table’.

 

The reason I was not overly concerned up until now is that we have been dealing with other teething issues, so truthfully, I am glad we are to the point that we now are able to reliably tune above the staging point. I dont know if we need to return to default settings and start over, but everything above the staging point needs to be redone. After we get the injectors balanced between Primary and Secondary banks.

Next big item - PSRU oil leak. Tracy says most common probs are outflow obstruction related, so we will approach from that angle. Our oil feed is a 1/8"-AN4 stainless hard line without a restrictor. We need to eval outflow during some short runs and see if that affects the visible leak from the shaft

Dave