Guys,
It's been a while since I posted any information:
First the big bore kit. I pulled the first piston out of the engine, so that I could see how the piston skirt was conforming to the bore. I also wanted to see how close the piston deck came to the cylinder head deck. The skirt looked very good, however, the clearance from the piston to the head had to be increased, one, to lower the cranking compression, and two, to allow a little more margin to the head. I sent the piston back to the supplier with a revised print, and ordered the first set of production pistons. I'll have a due date in about a week. I increased the intake & exhaust valve clearance eyebrows to allow for 1mm large valves, and 7mm lift cams.
I installed the second revised piston into the engine last week, and started working on the fuel injection mapping. Fuel mapping has been a real problem. Almost to the point of scraping the big bore kit. Once we figured out that the O2 sensor lead needed to be grounded, that stopped the ECU from constantly trying to correct the mixture back to 14.7 to 1. I found and ordered the correct thread Allen bolt to plug the O2 sensor hole in the exhaust port. There is no need to order the Bazzaz grounding wire. All that's needed is to cut the O2 sensor wire and add a grounding lug to it, connecting it to the main chassis wiring ground. Next, I found that the signal width of the ECU was not wide enough to provide a 13.2/1 fuel mixture to the 170cc displacement engine. The stock fuel injector is not rich enough. So I installed a fuel injector from a larger Honda engine, and that cured the problem. Now I can proceed with the mapping & dyno work. So far the i-Map controller is working. Mother Nature is not, it's very cold. I need to get out on the road to finish the preliminary mapping, so that I'm close for the dyno.
I talked to DynoJet yesterday. They have initially decided to only produce the $250.00 Power Commander FC, and not the PCV, with the Auto-Tune. They can't get it to work properly with the Honda Grom ECU. They are road testing the PC-FC later this week, so a production PC-FC unit should be ready to sell in less than a month. At this point, I'm sticking with the Kitaco i-Map. It's easy, and it's working. I'll get a PC-FC when they come out, just to compare it.
That's about it for now. Testing never stops, but at some point you have to shoot the engineer, and put this stuff in production.
Brian S
It's been a while since I posted any information:
First the big bore kit. I pulled the first piston out of the engine, so that I could see how the piston skirt was conforming to the bore. I also wanted to see how close the piston deck came to the cylinder head deck. The skirt looked very good, however, the clearance from the piston to the head had to be increased, one, to lower the cranking compression, and two, to allow a little more margin to the head. I sent the piston back to the supplier with a revised print, and ordered the first set of production pistons. I'll have a due date in about a week. I increased the intake & exhaust valve clearance eyebrows to allow for 1mm large valves, and 7mm lift cams.
I installed the second revised piston into the engine last week, and started working on the fuel injection mapping. Fuel mapping has been a real problem. Almost to the point of scraping the big bore kit. Once we figured out that the O2 sensor lead needed to be grounded, that stopped the ECU from constantly trying to correct the mixture back to 14.7 to 1. I found and ordered the correct thread Allen bolt to plug the O2 sensor hole in the exhaust port. There is no need to order the Bazzaz grounding wire. All that's needed is to cut the O2 sensor wire and add a grounding lug to it, connecting it to the main chassis wiring ground. Next, I found that the signal width of the ECU was not wide enough to provide a 13.2/1 fuel mixture to the 170cc displacement engine. The stock fuel injector is not rich enough. So I installed a fuel injector from a larger Honda engine, and that cured the problem. Now I can proceed with the mapping & dyno work. So far the i-Map controller is working. Mother Nature is not, it's very cold. I need to get out on the road to finish the preliminary mapping, so that I'm close for the dyno.
I talked to DynoJet yesterday. They have initially decided to only produce the $250.00 Power Commander FC, and not the PCV, with the Auto-Tune. They can't get it to work properly with the Honda Grom ECU. They are road testing the PC-FC later this week, so a production PC-FC unit should be ready to sell in less than a month. At this point, I'm sticking with the Kitaco i-Map. It's easy, and it's working. I'll get a PC-FC when they come out, just to compare it.
That's about it for now. Testing never stops, but at some point you have to shoot the engineer, and put this stuff in production.
Brian S
