ESE's works engine tuner

[seattle smitty]

"Face-melting speed," . . .

For fun, google "Lt. Col Paul Stapp rocket sled" for YouTube videos of a NASA researcher of the late-40s/early-50s who was called "The fastest man on earth" in my early youth. On our black-and-white televisions, we got to watch 16mm movie footage of this insanely brave man, a doctor doing research to determine the maximum speed at which ejection seats for then-new jet fighters could be deployed.

Here's another human test dummy from those days: www.youtube.com/watch?v=9V49oBXCEEY (if the link doesn't work, go to YouTube and search "Human Tolerance to Wind Blasts"

[Martin1981]

Roland has one huge handicap: the rulebook. The carburettor diameter is restricted to 30 mm. That of course influences all other dimensions in his inlet system.
A second handicap is that none of these kart engine manufacturers has unlimited funds. Roland had to avoid upsetting the beancounters so he worked with what he had.
Besides, even if money would not be an obstacle, Kart engine manufacturers cannot change an engine at will because of homologation issues.
Rolands primary goal is to get his fuel injection approved, which won't be easy because he already rubbed some stone-age officials up the wrong way with the synthetic inlet inserts in the present Modena engines. These were homologated all right, but subsequently the officials let Modena know that these inserts won't be accepted in future engines. Why? All I can think of is envy.

thanks Frits! so i guess if he could like he would, we would make the case bigger...

yes....the rulemakers. i already heard the inlet insert story and only can shake my head.

[F5 Dave]

I can understand why air cooling is appealing to some... Not a looker!
Attachment 308608

Speaking of lookers, here's a shot with the dweeb mounted.
Attachment 308607
Would fabricating a more aerodynamic "racing seat", one that takes over where my back ends, make any noticable difference? We're not talking face melting speed here, hopefully around 130-140kmh.

Yes road seats are terrible to race with, that will be the biggest improvement in being able to move around and not fighting foam. Aerodynamically you are just starting to make a diff at that speed. Rear is more important than one would think. Old RS125 seat would do. Older the better.

you might want to consider some hose clamps. Just saying.

[adegnes]

Yes road seats are terrible to race with, that will be the biggest improvement in being able to move around and not fighting foam. Aerodynamically you are just starting to make a diff at that speed. Rear is more important than one would think. Old RS125 seat would do. Older the better.

you might want to consider some hose clamps. Just saying.

Didn't even think about the fighting foam part, makes sense, it shure is sticky. Thanks for the rs125 tip!

Clamps are for losers. No, the picture was taken while I was routing all the hoses.

Here's how you can get some proper damping and adjustability in the rear cheap if you have friends with flashy bike parts addiction - Mtb third shock.


Video of rebound adjustment with the third shock
http://youtu.be/VbS1NZvA_HA

[twotempi]

"Face-melting speed," . . .

For fun, google "Lt. Col Paul Stapp rocket sled" for YouTube videos of a NASA researcher of the late-40s/early-50s who was called "The fastest man on earth" in my early youth. On our black-and-white televisions, we got to watch 16mm movie footage of this insanely brave man, a doctor doing research to determine the maximum speed at which ejection seats for then-new jet fighters could be deployed.

Here's another human test dummy from those days: www.youtube.com/watch?v=9V49oBXCEEY (if the link doesn't work, go to YouTube and search "Human Tolerance to Wind Blasts"

Wasn't this test the orgin of Murphys Law where the person in charge of the data off the poor sucker in the chair was a Colonel Murphy. The patches attached to the sucker were wired up back-to-front so after a 20G deaccelaration no data was collected. Hence Murphys Law became "if it can be done wrong it will be done wrong" !!

[wobbly]

Re the Modena and Rolands problems with the CIK.
I can tell you now that the 24/7 inlet will never get thru,as what is the difference between a mechanism that allows the reed block "to move "
and a mechanism that moves PV blades.
And getting the injection system approved, would in the end mean that ALL the other engine building manufacturers would have to have access to exactly the same part.
So what point would that be for Modena to spend a heap on R&D of a part that would have to be available to all.
Exactly the same issue arose with Rotax Max - Tillotson developed a pumper carb that was a bolt on and made better power everywhere.
Did that get thru the CIK, no, and it would have been an off the shelf part available to all.
Development of KZ2 engines is still WAY behind what can,and has been done already, in GP125 racing - especially regarding transfer and Ex duct geometry.
Cooling is another area with big gains to be made due to the straight line ignition affecting badly the current almost non existent squish action.
The mods I am playing with recently, destroy the best World Cup engines from Eric Savard, so I believe Modena really are wasting their time concentrating on
clever but ultimately no go technology when scrutinised by the CIK for homologation.
Sad but true I believe.

[TZ350]

Here's how you can get some proper damping and adjustability in the rear cheap if you have friends with flashy bike parts addiction - Mtb third shock.



Video of rebound adjustment with the third shock
http://youtu.be/VbS1NZvA_HA

That shock idea looks good and I like the tail light, we have to run a rear light in bad weather too so your idea looks a good one, thanks.

[husaberg]

That shock idea looks good and I like the tail light, we have to run a rear light in bad weather too so your idea looks a good one, thanks.

The Japanese Pavement speedway bikes used to run twin adjustable steering dampers on each fork leg.
http://livedoor.blogimg.jp/autoraceb...1/71c00e65.jpg

[F5 Dave]

Hmm that's either the biggest stinger I've ever seen or the smallest muffler. Might need some work meeting noise control if you have such a thing, and if you don't you will have soon running that

[peewee]

hey guys what material is the high performance conrods made from. is it usually 4340 steel ?

[adegnes]

Hmm that's either the biggest stinger I've ever seen or the smallest muffler. Might need some work meeting noise control if you have such a thing, and if you don't you will have soon running that

That is the stinger, but there's a 13.5mm venturi at the end of the cone. The stinger will be perforated and used as the innards of the muffler, but I want to get it running and see how the pipe performs before i finnish it.

[TZ350]

Injectors turned up from Ecotrons today, four days from date of order and two of them were weekend days, pretty good service in my books.



I fitted a smaller injector and did a bunch of runs at different throttle settings. Interesting that the 60, 50 and 40% runs carry on out to close to 13,000 rpm.



Blue line is the TPS. 100-90-80-70-60-50-40% throttle settings. It is certainly throttling and coming back onto the power much better. I will have to analyse the data to see if I can use an even smaller injector.



Just by changing the central injector (and the injector size in the EFI software) I got the Blue line, I am not sure what that means as by rights, it was the same Alpha-N map so I was expecting the curves to be the same.....

[adegnes]

I've never really known exactly why the crank should have some axial play, thought maybe it was because of different expansion rates between metals and torque between the casehalves, and maybe to allow for some misalignment.

Found this:
http://husaberg.org/mechanical/17170...ng-thread.html

From the first post:

"what causes the oem roller bearings to fail ?

1) crank spread under its own weight is the main problem

2) misalignment of the bearing bore, seems rare, search lineaweavers posts

3) insufficient crank axial play (end float) with crank spread

what is crank spread?

when the crank spins, its own weight causes it to spread outward opposite the pin
when you add in the combustion forces they contribute further to the spread.

sorry for the crappy pic there is a better one i will add later



in this condition while running the axial play of the crank reduces until the forces deforming the crank outward are matched by the crank resisting deformation (a function of its stiffness)

if you don't have enough end float or stiffness for the weight of the crank and the rpm its doing your end float (axial play) will become zero

with zero axial play the NJ series roller bearings will experience side loads as they are now subjected to some of the force causing crank spread."

[wobbly]

Where we are talking "normal " cranks and not idiot huge things like the KTM - or Triumph twins for that matter, axial end float on the crank
simply makes more power.
As the axial clearance of the stock bearings is taken up by differing expansion rates or crank flex, the normally fitted ball races see a huge increase in end wise friction.
Using C3 as you should ,does help, but when using balls you have to polish the crank axles to alow a slip fit with 0.3mm end float in a 125.
This ultimately causes wear on the slip fitted journals.
Using rollers means that the axial clearance can be arranged to be within the bearing end faces, and the inner race can still be a slight press fit.
As a side effect the rollers are capable of twice the radial load so last much longer - though they do have slightly higher rolling friction.
The only issue with the rollers is they dont like any axial angular misalignment, and in really dumb designs like a Triumph twin, where the axles of a 750 are the same size as that
we use in a 125, of course they bend like hell with 15Kg of pig iron flailing about.
So they developed a special line of rollers called " SuperBlend " that have a slight radius tapered end on the rollers to allow some axle flex.
Many designs have one bearing locked onto the crank - but floating the other end still works well to reduce axial friction.

[peewee]

well i rounded up some carbon blocks from work. also got some spare pieces of the sand molds used for thermite welding. between these im hoping i can make a plug and weld over the top, thus creating a tunell. both will be easily removable. ill report back if it works or not