Dyno results hot off the presses!

[bandet01]

looks good now i need to find somebody to dyno tune my bike in my area

[GNEPIG]

.. well, did anyone miss this thread yet?
The apparently continuing saga of the dyno tuning of Gene's lovely Red special continues
..ok, if you rember from the preveous episode my plugs looked a little lean and i had a little step from idle to go so after messing around with the idle circuit ,changing pilots to 45s the plugs started to look and act like they were going to foul after about 35 miles of continous riding. so I lowered the needles down one notch putting them in the #2 position. this felt pretty good, no hesitation or steps across the rev range.. the bike did feel like things had changed so it was time for another DYNO RUN to see what's going on
.. in this picture you can see my previous run [in blue] and last nights run [in red].. as you can see this time change was not so good.. my numbers are down to 82.81 hp and 60.88 ft lbs torque..
although i did straighten out my target area some i lowered power everywhere else.. next i will ride it around for a few days then check the plugs and figure out what i want to change next.
.. i have to find and order some air jets, they are not to plentiful around here, i am open for some ideas
. enjoy

. trial and error, this is the way we learn

[Shuriken]

Choice between fuel economy and power? ;-)

[pggg]

Gne, don't worry about white plugs. Modern petrol doesn't colour up plugs like years back. If there's carbon on the rim and carbon at the bottom 1/3rd of the ceramic - then they're fine. My own plugs always run whitish. After a year or so they tend to get a light grey/ tan sort of tinge. When new, they run white for months. Not a drama. My bike has a temperature gauge connected to the cylinder head. The bikes' not running hot or lean with white plugs at all.

[LoserShoes]

Yep, 14:1 gives maximum efficency, not the same thing as maximum power.

Steve

[GNEPIG]

.. pggg, where do you have the temp sensor placed on your head, and what is the average running temperature of your head? this information could be very important. i have a laser temp gauge i could use to test mine
. i think i would like a little color on my plugs just to be safe, the temperatures here in sunny mid western fla can get a little hostile during the summer and i ride my bikes kind of hard at times, ok most of the time and with my fat butt woman on the back..
.. i'm not so sure about the economy part of this, since i've made this last change i've been hitting reserve at about 78 miles
. before i made this change i was getting to about 86 miles before hitting reserve.. i need to think about this also

[pggg]

GNE, temp gauge is $20 car radiator type wedged in firm between the fins. Works well. Average cruising temp on my stock 78E was 110 - 120 deg C. On my higher compression 1196cc it's around 130 - 135 deg C. Hits the peg at 160C plus when the motor cops a good thrashing.

[GNEPIG]

.. thanx pggg, i will compare your temps to mine, nifty guage setup, i like the oil pressure guage on the other side also
i will look into a similar set for mine
.. i measured my timing tonight and noticed that it went to 50 degrees btdc with the vac hose on at and above 5200rpms, does this sound right to you? at 1000 rpms i'm at the F mark and with the vacuum hose removed and plugged , i rev the motor up to 5200 rpms and i get 35 degrees btdc.. i did change the centrifical advancer about 2 years ago, it might be one from an E model.
is there such thing as to much advance with this setup on my SF model?
thanx again, gene

[pggg]

Hey GNE, all I can think why specials were timed 5 deg back from standards was to stop wheelies with their high bars and smaller back wheels! 50 deg seems a bit high, I'd knock her back 7 or 8 deg to feel comfortable especially using the highest octane. Those springs do get worn on one side so I 'spose they get weaker. Mine sits on F at idle and 42 deg at noise with a 78 advancer. I'd played round with retarding the timing because of Dynacoils and high compression, but decided I was being a fussy old woman and settled on 6 deg advanced. Got more kick from the engine.

Here's a pic of a 80' advancer and a 78' with their different markings. That 78' spring is thinner gauge and has 13 coils. That 80' spring has 14 coils and is thicker gauge.

[GNEPIG]

.. i have a little stache of those advancers hidden some were in my pile of stuff, i'll reveiw what i have if i can find them. i will test the ignition timing on the "Ugly" bike and compare the two also.
..

[pggg]

Hey GNE, I just checked my timing and with hose on it's up past 45 deg and with hose off its at 39 deg, so yours is probably quite O.K. Was thinking it'd be damn interesting to see what a 5 deg advance on your best tuning result would do. Maybe 90 horses?

P.S. sorry, it's the LOW octane that can pre-detonate if running too far advanced. Faster burning than the high stuff.

[GNEPIG]

.. i checked and i do have the 78 advancer in there, might be why it runs so good now 78s are supposed to be set for 36 degrees.
.. i took a long ride saturday and stoped after about 16 miles of going about 60 - 65 mph and checked the temp on the back of the cylinder, the same place you have your sensor placed. the temp there was 235 degrees[about 110c], then checked it on the head, on #3 cylinder it was 215. dont know how acurate this would be because the damn temp gauge quit working after that, then i noticed that the exhaust had broken off again on the right side, giving a big exhaust leak. so, no good plug readings either
.. there is no room for complaning here because i can fix the pipe, trade the laser temp gauge back to the tool truck, continue my needless testing another time and it was a super nice day for a long ride

[GNEPIG]

.. can anyone get enough dyno runs?. not me, apparently.
well tonights run is better than the last run, my numbers are back up but not for as long as my best runs (curves are not as straight) the high numbers show up later and end sooner.. . i have a couple more things to change back, sometimes i don't know when to stop and i have a tendency to change more than one thing at a time, a shortcoming that i really need to address.
.. the numbers tonight are: HP=84.25,.. torque= 61.36 and who the heck knows whats going on with the fuel line!
.. i am going to post a dyno sheet of a run that i did the other day in the other bikes section, i know i'll be hated for that one but its for comparison and you will know why you dont want to race a vrod.. it sure would be cool to have enough money to make my XS run as good as one of those..

[mro]

can anyone get enough dyno runs

Nope, and like pics too

Look forward to vrod info


mro

[mro]

Did it agin

Need to rember to wear glasses

ment to post this to "Dyno runs hot off the presses"