On Wednesday, June 29, 2005, at 08:04 AM, Russell Duffy wrote:

 From Paul Lamar's list it has just been posted that the p port engine
on the dyno at MazdaTrix with remote fuel injectors is now running very
well, developing 220 hp (this sounds like a 6000 rpm number to me but
the post did not say the rpm) and it is idling smoothly at 1000 rpm.

 
Hi Jerry,
 
220 at 6000 would be impressive, assuming there are no big negatives we don't know about.  Did they specifically say they checked the throttle response?  Do you know what ECU they're using?  It could be that they can tune out some of the the remote injector problems. Any idea what they're using for a muffler? 
 
For the record, who's actually conducting the dyno runs, and who's reporting the results?  I would be more skeptical of the reports, if they're only coming from PL, as he's well known for only telling us what he wants us to hear. 
 
Don't get me wrong, I AM interested, just skeptical.  I won't do anything significant with the RV-3 engine for a while, so hopefully, more details will be available.  Unfortunately, I don't think it's ever been a problem getting good numbers from a PP engine on a dyno, but the problems occur in the real world, from fuel mileage, noise, and "drivability" issues (which could be meaningless to us, or not). 
 
Cheers,
Rusty (250 HP would be nice)

Rusty, the big deal of my post was that remote injectors are functioning very well.

The engine is idling smoothly at 1000 rpm. The ECU is Tracy's. The dyno runs are being done at MazdaTrix and Paul is reporting the results.

Of course we have known all along that the p ports would work just fine and that they would idle o.k. They have been doing so in cars forever. Lynn has stated his experience to the same effect. PowerSport engines idle fine. So the only issue was the remote injectors which has turned out apparently to be a non issue as well. They work fine although no mention was made about throttle response. The exhaust system as seen in photos is part of the dyno set up and I don't have the details. It does suppress the sound to tolerable levels. Today or tomorrow they will be testing the cool tube exhaust system that I built. It may cost some hp. we shall see.

I don't think you have any real numbers to suggest the p port will have poor milage if you take into consideration the power being produced. If you want to burn less fuel, throttle back to 200 hp.

Back to the remote fuel injectors. Cool side injection is certainly possible in p ports and in my opinion should be a design goal for safety reasons. It may not work in side ports due to lower velocities in the runners.

Time to give Paul Lamar credit for his huge effort in developing the p port to this stage. He has been very open about reporting difficulties along the way. Jerry