Dyno results hot off the presses!

[procamper]

The local dealer was having their "bikefest" today. Dyno drags were cheap, and while I dont think I'll get het prize for the most horsepower (one guy maxed out the dyno... which takes over 200 hp ) I think I would get the prize for the oldest bike to take a run at it.

Air/fuel mix is at the bottom of the pic - Running too rich everwhere with two REALLY bad spots The bike has a K&N filter, supertrap 4>1, Drilled airbox... I dont remember what jets I put in, But apparently I mustve gone overboard...

Here's a pic of the bike... Lots of comments on it-

[GNEPIG]

HOLY CRAP, it looks just my old drag turd...very cool!... bummer is mine met its match with the back half of a caddy... 5 years later the motor still lays on the floor out in the garage... thats the one with the big kit in it...very cool!

[GNEPIG]

oh yeah, pull the baffel out then see how she runs

[procamper]

The baffle met its match when it was introduced to Mr. Plasma torch. The dyno they have is in a modifed race car hauler. The sound the old warhorse was putting out at 10k rpm was... LOUD

[GNEPIG]

have you had this bike out to your local drag strip yet?

[procamper]

Nope... Just a lot of Backroad fun with buddies...

I did blow away a 95 camaro (LS1 and 6-speed) that belongs to a guy I work with... That was fun.

Anyone have any ideas on getting the mix right? I think Ill knock the mains back down one...

[GNEPIG]

.. how does run? can you feel those big dips in the low range?
make sure that when you go in to the carbs that you only change one thing at a time ... its a pain in the clams taking the carbs on and off with the air box on but if you change too many things at once you wont know what helped you or made it worse
...also how it runs on the dyno is different than how it runs on the street... check the plugs first if they look good and the bike runs good dont change a thing

gene

[Shuriken]

Excellent stuff. Still, that's pretty good HP and torque at the rear wheel for a bike that old when only 95 was claimed at the crank.

Wonder what throttle opening the carbs were on for the two dead spots. Looks like the idle and mid circuits to me. Maybe it's all under 1/2 throttle?

Ben

[dorkpunch]

85.5! Ha! thats great! 100 more cc's than my metro and 30 more horsies! wonder if you could stuff an xs motor into a geo.... how would that be for sacrilige?!

[TopCatGr58]

Well, I finally found a local performance shop that does Dyna-Jet and DYNO tests, but they were closed for the next few days for some biking event, so hopefully next week I'll be able to take Godzilla there and see how it does!

I'm doing some maintainance this weekend, just checked the valve clearances, just slightly over on 1 intake, but not enough to worry about, I was more concerned if they had gotten too close! I'll be replacing my exhaust gaskets, and putting in some new plugs, although the old ones look pretty good. I'm curious to see what values the "little" big bore kit will provide vs. stock!?

Stay Tuned!...Oooh, hey, that's a good pun!

[pggg]

Pro, the dip at 41/2 revs is your pilot to main transition area and the lower dip is the idle to pilot transition area. Looks like your pilot jets are too big. Maybe that dodgy K&L brand? You really need a top quality exhaust design to get the most from rejetting with a free flow filter. Without fiddling with needle clips, I'd go down one size on the pilots and ditto for the mains.

[TopCatGr58]

My Dyno Results!

Hey there folks,

Well, the shop I had found only worked on American V-twins!
They suggested another shop, called them, but due to recent blowing up of a person's engine on an older machine, they declined, and suggested a third shop, I called them, and they said no problem, bring it on over NOW! SO...I hopped on Godzilla, and drove right over!

I filled out the paperwork, and signed the "WAIVER" saying that IF they blew up my motor that they were NOT liable! Then they rolled it in, commenting on how HEAVY it was! They strapped it onto the machine, and fired it up, getting the inductive pickups to working. It was a power test only, so they didn't hook up the exhaust sensor.

Then they shifted it up to 4th gear(btw procamper...what gear did they run yours in?), and proceeded to rev it up to 9.5 krpm as they watched the tester's tach readings! After they brought it back down, I reminded them that it DIDN'T have a rev limiter, and I would appreciate it if they didn't take it over 8.5k on the Bike's Tach!


The second run wasn't as good as the first, and the guy first thought that I might have had it a bit too rich, but then on the third run she really wound out nicely! He said that it seemed to pull strongly up to 8.5....yes I know!

A hi-res image if you want to D/L it:
http://www.photodump.com/viewer/topcatgr/Dyno_RunHiRes.
Here's the readout in a lower res form image:

There's a modest dip between 3.5K and 4.5K, but then it climbs almost all the way to 7.7k for the horsepower at 78.9, but peaked at 7.0k for torque at 56.5 ft/lbs. Not as impressive as Procamper's but it's plenty for me! This is with the 1179 big bore, Indy filters, old JCW 4-1 pipes, and 117.5 mains, 42.5pilots at 2.5 turns out!
PPPG, or other tuners, any suggestions on tweaking a bit more HP out of it without adding new cams or pipes? Wondering if another size or two larger main jet might help? Again, these values are rear wheel rated, and with shaft drive, they said could possibly add 15-20Hp for crankshaft values!?

[beechfront]

it looks to me like your HP was still climbing when he cut off the throttle---

[pggg]

Hey yeah Curtis, comparing numbers from different dynos is pretty much inconclusive as different dynos give different results. Take the bike to some other dyno tomorrow and almost guaranteed you'll get a differing bunch of figures!

Us customers rely on the operater to be experienced and skilled enough to set up the whole operation precisely and the fact they omitted fuel ratios puts them into the 'highly suspect' basket! You want that chart for eliminating guesswork on the re-tune.

T.C. did you notice small flashing dollar signs in the operaters eyes, and did they give the "Leave the bike with us for a few days, and we'll see what we can do" speech? If so, they need to be removed from the 'highly suspect' basket, and placed into the 'extremely dodgy' basket.

Is that dip in torque a lean or rich condition? As it's affecting the torque more than the H.P. you'd have to guess lean. Pro campers ratio chart makes the whole thing easier to decipher. Anyways, long grunty curves and good ratios are more important than a peak H.P. number.

As for that clown razing Procampers motor to 10 1/2 grand - he should have been sacked on the spot.

[TopCatGr58]

Hey Pggg,

Thanks for the input. No, the shop was very nice, I had stated that I was looking for the "HP" results, not really looking for Tuning process.....my faux paux, and so I got it done for $50.00. The guy sitting on the bike was the newbie being taught by the guy on the ground. So...I wondered if he really cracked the throttle wide open or not? But aside from like you said, a slight lean condition going into the mains, it pulls fairly steadily up to the 7.7k range and only then slightly drops off. I'm happy with the driveability and performance of this machine, and I don't usually run below 3.5k anyways, so that little blip doesn't really ever come into play with how I drive.

Next time I'm into the carbs I may drop another size larger jet in, 120's vs. the 117.5's, but that's about it. I don't have the adjustable needles on my slides, and I don't want to go tearing them apart to try to put shim washers in them!

Maximan came up with the idea of getting some of the 78-79 series cams and putting it in my head, for more lift and duration, would be a nice combo with my larger valves, but I'm concerned with how well a different set of cams would match up with the cam journals/bearings in my head, since I thought they were machined matched to each other at the factory?

But this bike has more than enough power to get me into trouble if I'm not careful and respectful of it, so I think I'll leave well enough alone for now!
T.C.