ESE's works engine tuner

[trevor amos]

Hi ,
I well remember a typically pithy comment from Kenny Roberts when being sponsored by PJ1 , suggesting that , it may show PJ1 on the tin but it`s 747 that goes into
YAMs , love their money but hate their shit !

Stay cool , Trevor

[Frits Overmars]

I well remember a typically pithy comment from Kenny Roberts when being sponsored by PJ1 , suggesting that , it may show PJ1 on the tin but it`s 747 that goes into YAMs , love their money but hate their shit !

I've seen the same thing happen with Bell-Ray, Quaker State, Putoline and Eurol. They might deliver the sponsor money and the tins; the oil inside came from Castrol .

[teriks]

Disagree with you Mike my understanding is the increased amount oil makes the mixture leaner, as it allows a smaller volume of petrol to pass through the jet.But could be both?
One simple way to see is to get 1 ltr of fuel mix at 20:1 and run it through a mainjet at the bottom of the container and then compare it to 1 ltr of fuel mix at 100:1 time the results and see.

In addition to that, do the same test, but instead of changing the ratio, change the fuel temperature.
-With the 80% methanol / 20% castor I am regulated to use, fuel temperature have a very large impact on viscosity (and AFR).
I guess much less so with lower oil content, but anyway.

[kel]

it was funny to see TeeZee getting all excited as Kel cut through the field on the Beast.

The wife mentioned he was getting excited, glad it was entertaining.
We had a bit of a shocking start to race day with the bike and I having a number of disagreements, stalling on the line was all me though . Thankfully my prediction that we'd got all the bad luck out of the way was correct and things went better for the points races. TZ had installed a TPS, altered the ignition curve to 3D map, installed the deto regulator and set a soft and hard rev limiter, all of which seemed to be working well as there were no mechanical issues and the bike was still clearly the quickest thing on track. Theres still an issue with a delay coming back onto the throttle but Im sure we can sort this out. Chassis wise we installed a new shock Friday night which worked out really well, even with my that looks about right approach to setting preload and dampening the handling improved immensely.
First race went well with a good start and managing to get through traffic reasonably quickly, as is often the case luck played a part in finishing 3rd but with that said second was a real chance with just a .9 sec gap separating us.
Second race and the start was a shocker (thought I'd got to terms with getting off the line but more practice required), by the time I got through to 5th the front 3 were long gone so just settled in behind the 4th place rider and played it safe, passing with 2 laps to go to finish 4th. The bike and I probably could have gone as much as 2 seconds a lap quicker but there seemed little point.
I was hoping to have my new bike ready for the next round but TZ's GP125 is getting so good I might try for a ride next round as well.

[2T Institute]

I've seen the same thing happen with Bell-Ray, Quaker State, Putoline and Eurol. They might deliver the sponsor money and the tins; the oil inside came from Castrol .

Even more famous one was when Merv White the Suzuki GP manager had a half dozen or so Texaco executives in Barry Sheene's pit box. Merv proudly announced 'See the same oil you put on the shelf is what we use' to which Franco Sheene replied(without looking up) "Christ NO we tip that shit out and put Castrol in the old bottle ,as soon as we get it "

[SS90]

The wife mentioned he was getting excited, glad it was entertaining. TZ had installed a TPS, altered the ignition curve to 3D map, installed the deto regulator and set a soft and hard rev limiter, all of which seemed to be working well

Wow, this all seems like alot of expense and effort, shame that you didn't manage to catch the win (I know how you feel) what bikes took the top 3? If they where dirty old 4 strokes, with-out all these gubbons one would have to wonder if someone is heading in the right direction... As you can produce an immense amount of torque from a two stroke, with-out any of the crap that thing has bolted on to it.

[kel]

Wow, this all seems like alot of expense and effort, shame that you didn't manage to catch the win

Yeah I know, Im crap. Hopefully I can figure out this riding lark someday soon.

Actually I forgot to congratulate Warrick on an inspired riding effort, and of course young Arron Hassan who pulled off the win in the second race.

[F5 Dave]

So what's your point SS? Fastest bike doesn't get the win? It isn't a drag race & to be fair Kel isn't a young buck or anything. pointy end of field often is inhabited by such bods (some like Young Nat would be less than 1/2 his age & then some). That said, I found he was a damn sight faster than I thought he might be first time in wgtn.

[kel]

Kel isn't a young buck or anything.

Now that just wasn't called for. What you failed to appreciate is that with my tinted visor down I look as young as the next guy

edit - I believe young Arron would be a third of my age. Kids have no respect for their elders these days.

[FastFred]

you can produce an immense amount of torque from a two stroke, with-out any of the crap that thing has bolted on to it.

SS90's poisonous pen ..... regular as clockwork ... ... talks cheap, lets see a dyno graph of your own work.

[Grumph]

SS90's poisonous pen ..... regular as clockwork ... ... talks cheap, lets see a dyno graph of your own work.

Yeah, he was an obnoxious bastard when here...yeah, I know, pot, kettle....but at least he got out on track and did it.

Personally, I'm curious about the Manx Norton in your signature Fred...Protar kit is it ?

[F5 Dave]

Now that just wasn't called for. What you failed to appreciate is that with my tinted visor down I look as young as the next guy

edit - I believe young Arron would be a third of my age. Kids have no respect for their elders these days.

hey buddy I'm drinking from the same well, or getting there

[F5 Dave]

Why don't you pop in & see Fred's Manx, I'm sure he wouldn't mind, you're both in Chch I think.

[Grumph]

Why don't you pop in & see Fred's Manx, I'm sure he wouldn't mind, you're both in Chch I think.

I'd love to....but if he had one I'd already know him.....and he'd know me.

[bucketracer]

... you can produce an immense amount of torque from a two stroke, with-out any of the crap that thing has bolted on to it.

SS90, I know you claim to be an experianced industry insider but your opinions often don't seem to stand any sort of scrutiny.

SS90 Maybe you have achieved a torqe monster, but I doubt it, a dyno graph of your own work could change my mind but I am not holding my breath.

My opinion is that a 28PS 25 NM air cooled two stroke 125 would currently clean up in NZ buckets.

Sure it might clean up but first lets use BMEP calcs to see if a F4 legal 28PS 25NM air cooled 125 two stroke is possible.



SS90 28PS is easy, TeeZee has done more than that, its the 25NM from a 125 thats making only 28ps that might be the problem as that means the RPM is low and the BMEP high. If you can follow the maths you will understand how 25NM may not be possible from a lower powered engine.

Converting metric to imperial:-

28PS = 27.6BHP (1PS = 0.987BHP)

25NM = 18.4Ft/Lbs (1NM = 0.737Ft/Lb)

Finding the RPM that 28PS 25NM relates to from the formula for HP.

HP = (RPM*Torque)/5252

transposing for RPM gives :-

RPM = (HP*5252)/Torque
RPM = (27.6*5252)/18.4
RPM = 144,955.2/18.4
RPM = 7,878

Now to find the BMEP needed for a 125 2-Stroke to make 25PS at 7,878RPM

BMEP = (HP*6500)/(L*RPM)
BMEP = (27.6*6500)/(0.125*7878)
BMEP = 179,400/984.75
BMEP = 182.2 PSI

Converting PSI to Bar. 1PSI = 0.06895Bar

182.2 PSI = 12.6 Bar

That's a higher BMEP than Wobblys water cooled F3 400 or the Honda 500 V Twin GP bike.

SS unless you know more than Wob and Honda I am not sure you could make a 28PS 25NM 125 F4 legal 125 air cooled 2-Stroke let alone finish a race or even start one.



The idea of a high 25NMs of torque from a 125 aircooled making only 28PS is ... Busted