ESE's works engine tuner

[Henk]

I thought I saw something that could have been standoff on the FXR when I was running it without the pod and with the cam timing out. Not going to try and repeat in the interests of science because I don't want to rebuild my engine (again)

[TZ350]

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Ok this is where we are now at with the plenum.

When I started this the thinking was, that if the regulation 24mm carb restricted the power output of a 125cc then find a way for the engine to breath without the 24mm restriction by letting the motor breath through a 34mm inlet tract from a plenum.

But as always, getting a good idea to actually work is not that simple .........



Buckets Pipe with Side Carb (green) and Plenum (red) compaired to one of the old 21rwhp GP's with an RM style pipe (blue).

Bucket with his chamber and plenum was looking for a more low down and broader spread of power.



RS Pipe/Plenum (red) compaired to the old GP (blue)

The RS (red) and Buckets (green) Pipe and Plenum setups are running on a cylinder with the exhaust opening 86 Deg ATDC and the old GP with the RM spec pipes exhaust opens 79 Deg ATDC.

The old 24mm carb GP setup has more exhaust port-time-area than the plenums setup.

Looking at the graphs, I think there is a functional missmatch between the rev range the larger plenum 34mm inlet want's to work at and the exhaust port-time-area of the plenums cylinder and the smaller size of the exhaust port is holding the plenum back.

I think the exhaust is running out of go just as the plenums 34mm inlet tract is getting into its stride and the plenum setup may be more suited to the old style GP engine with it's greater exhaust port-time-area.

It also might be time to look at cutting exhaust side ports into the plenum cylinder to get more exhaust port-time-area.

The next step when I get time is to try the plenum with the old style GP cylinder and RM pipe modified to fit my bike.

More $$$ and another trip to the dyno..........

And next year the plan is to make a set of test pipes with slip joints....for testing when the dyno $$$'s allow......

[TZ350]

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While I was waiting for my turn on the dyno, they were running up a Honda RS125 that was turning out 40+ rwhp at 12,500 rpm.

Now I have an old RS pipe (maybe a 37'ish rwhp one) and a plenum that flows a very impressive amount of air, nearly as much as an old RS carb.

So why can't I make high 20's hp........... exhaust port-time-area and scavinging flow patterns is all I can see missing..........

With some development 27-28 rwhp must be possible with a reasionable spread of power from my 125 engine....

[Spearfish]

.

While I was waiting for my turn on the dyno, they were running up a Honda RS125 that was turning out 40+ rwhp at 12,500 rpm.

Now I have an old RS pipe (maybe a 37'ish rwhp one) and a plenum that flows a very impressive amount of air, nearly as much as an old RS carb.

So why can't I make high 20's hp........... exhaust port-time-area and scavenging flow patterns is all I can see missing..........

With some development 27-28 rwhp must be possible with a reasonable spread of power from my 125 engine....

40hp! ? Meh, yours will be there in no time you haven't reached 200 pages yet.

[richban]

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While I was waiting for my turn on the dyno, they were running up a Honda RS125 that was turning out 40+ rwhp at 12,500 rpm.

Nice 320hp per litre yes please. Best I have got so far on the FXR is 155. I want 175 but that is hard from on a 4 stroke single.

[speedpro]

Nice 320hp per litre yes please. Best I have got so far on the FXR is 155. I want 175 but that is hard from on a 4 stroke single.

Over 20hp isn't to be sneered at, mind you being a pussy 4-stroke it is allowed to be half as big again as a real race engine.

[bucketracer]

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I got the job of setting up NedKellys IgniTech programmable Ignition.

If your not lucky enough to have a bike that Igni make a drop on ignition for then you have to setup one for yourself.

This is how we went about it with one of Team ESE's bikes and Mt Eden Motorcycles dyno. Chambers is friendly with Mike and was able to get a bit of a deal on some dyno time.



First step is to find TDC.



Mark TDC and the Advance you want, we chose 15 degrees BTDC. and marked them on the fly wheel, the flywheel turns ant-clock wise so the advance is marked to the left of the TDC mark.

This does not have to be that accurate as its only needed as guide so you can see that the ignition is firing somewhere near the right place. The ignition will be optimized on the dyno later.



The next move is to find the base advance.



Ours was about 10 Degrees.



The base advance is entered into one of those little box's in the program and initially the real advance is setup as a straight line in the curve part of the IgniTech program.



With the ignition programed and the spark plug out, (but plugged into the HT lead and resting on the head) you can then use the Dyno's starter to spin the engine over. Then with the motor spinning over you can use a timing light see if you have got the initial advance more or less where you want it.

If the advance lines dont line up, you simply adjust the base advance setting and cylinder correction until they do.



With the initial advance setup more or less where you want it, you are ready to rock and roll on the dyno optimizing the ignition curve.

The IgniTech software is very clever as changes to the ignition curve can be made on the fly and the Ignition itself re-programed while the engine is still running............

[richban]

Over 20hp isn't to be sneered at, mind you being a pussy 4-stroke it is allowed to be half as big again as a real race engine.

Now Now speaking of big check out the size of this carb. Testing the new head. Flowing 118cfm

[koba]

Now Now speaking of big check out the size of this carb. Testing the new head. Flowing 118cfm

Is that a ring of Knead it around the carb mouth?

[bucketracer]

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Something to cheer the 4-Stroke boys up, some naughty valve float porn Vid

There is some juicy spring oscillation here.....

[richban]

Is that a ring of Knead it around the carb mouth?

Yep playing with bell shapes. Added 4 more cfm. Ended up just liking a small radius bell, nothing fancy.

[koba]

Yep playing with bell shapes. Added 4 more cfm. Ended up just liking a small radius bell, nothing fancy.

Love your method!

[bucketracer]

Running up NedKellys RS/GP125 on the dyno



This has port duration’s of, inlet 225, transfers 132, exhaust 202 degrees and an RM copy chamber.



Had some fun playing with ignition curves………

There was enough time between runs to be able to make a change to the curve and re-program the ignition before the next pull..........

[TZ350]

Now Now speaking of big check out the size of this carb. Testing the new head. Flowing 118cfm

I am very impressed with your setup and the dial gauges for checking flow at different valve lifts.........

[TZ350]

.

The boys have been busy dynoing Neds bike so that we have a base line to work too.

We know we can make hp like Neds, but we realy need power spread to be able to compete with the FXR's and bikes like this South Island one........



And the new light weight frame, from memory I think the whole thing is around 80kg's...



Marsheng kindly sent me his dyno graph too.........



I would love to see some other 4-stroke graphs, just to see what we are up against.............

We have been a bit distracted before chasing hp, power spread is the way forward for us at Mt Welly I recon.......