david g,question for you.....

really enjoyed following your mh 44 efi conversion,my question is,did you happen to record any torque graphs from a dyno and any o2 numbers from a datalogger.i put fuel injection on a 1cyl,i do have a cnc dyno,and a good data logger.my hp numbers went up a few over 2 carbs(s&s)as expected,but the torque curve changed drasticly.just wondering what you found out ????..







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I do not have logged data, but here are my observations.

Low end torque seemed to increase a lot, I could lug engine completely down until it scared me and would not stall. Net HP was probably about the same because I think the engine ran out of air, would just turbo'd it and not put in high compression pistons if doing again.

Idle was smooth regardless of mixture, never misfired. T

ractor does not have unburned hydrocarbon smell anymore, even without cat converter.

Really have the ability to set spark advance to varying conditions now.

I have been wanting to get the can bus EGT module, and hook up the thermocouples I installed and look at cylinder temperature differences.

I am intrigued by port injection, but the siamese intake really complicates this.

I built an electronic governor, but have not installed it yet.

An "ideal" tuning setup would have the dyno be computer controlled, and run a master program that looks at the engine data to curve all the readings. JD Seller graciously let me use his dyno, I final tuned by driving tractor around the hills here with varying loads. It is really hard for one guy to run dyno, adjust throttle for tuning. I need to run more tuning on mine, but it has been so blasted hot, hope to do it in the fall and log some data.

Email is open.

About the leanest my tractor wanted to run was 14.5, I dropped that down to 11.5 at what I "thought" was peak torque load. This is where the EGT for each cylinder would come in handy, as I could find the misfires. I could calculate the HP pretty easy if I put a RPM and pressure sensor on the dyno, but not sure JD would want those modifications to his dyno. I would assume pump is PD, so just do the math on the displacement to calculate volume.

I could calculate the HP if I measure the cooling water on dyno, but do not know how the lag would be.

BTU's are BTU's.