ESE's works engine tuner

[peewee]

i use it with windows7 and it seems to do fine

[Vannik]

hello mr vannik is engmod2t compatible with any windows?Thanks

Win XP and newer. I cannot test on older so do not know. 32bit and 64bit.

[Greg85]

thanks peewee, vannik for the information

[ranasada]

Question to Wobbly & Frits working on a TM KZ10B:
using this link (http://www.underdogsracing.com/fospipe/) just posted i tried to find setting for having right parameters (similar: only lengths are not correct but total and central lengths are right) with the fixed pipe in homologated fiche. But setting are a lot of distance for the reality about "target HP" (72 ) and "Lcyl" (the real is 60.25).

So, why this pipe have these measures? What TM want to get in this way?

[Frits Overmars]

Frits, I have a question about your FOS pipe, before I knew about this thread someone sent me a link to http://www.underdogsracing.com/fospipe/ I used it to calculate a pipe, but used the 5 stage experimental calculator thinking it would be better.... My question was should I make the same pipe again, or should I use the original FOS formula? Jordan.

Jordan, all these programs claiming to calculate a FOS-pipe were created without my involvement.
Moreover, several of those programs are based on obsolete data, so I won't comment on any of them. Here is my recent version.

Question to Wobbly & Frits working on a TM KZ10B: using this link (http://www.underdogsracing.com/fospipe/) just posted i tried to find setting for having right parameters (similar: only lengths are not correct but total and central lengths are right) with the fixed pipe in homologated fiche. But setting are a lot of distance for the reality about "target HP" (72 ) and "Lcyl" (the real is 60.25).

Ranasada, see my above answer to Varthrix.

[varthrix]

Thank you for the quick answer Frits, I will do some calculations later when I have the time. What would you say about the reed valve area I asked about? I'm thinking of ditching the reed valve altogether, seeing people from Germany making 20 hp from 85 cc Simson engine with piston port, I should be able to get at least 10-12 hp from my 70 cc engine.
Also I hope it's not a problem that I'm calling you by your first name, read a couple hundred pages ago that you like to be referenced by your first name.
Sorry for all the questions, kind regards Jordan.

[Frits Overmars]

What would you say about the reed valve area I asked about? I'm thinking of ditching the reed valve altogether, seeing people from Germany making 20 hp from 85 cc Simson engine with piston port, I should be able to get at least 10-12 hp from my 70 cc engine.
Also I hope it's not a problem that I'm calling you by your first name, read a couple hundred pages ago that you like to be referenced by your first name.

Piston port induction will be fine for getting 10 to 12 hp from a 70 cc engine. If you're not careful, you will get more power than that.
I haven't got the faintest idea about the dimensions of a 'Minarelli horizontal' so I cannot comment on your reed valve question. Maybe Wobbly can help you there.
And I still prefer to be called by my first name .

[wobbly]

The TM-B pipe you have shown is not close at all.The stinger of a stock engine is 24mm for example.
And a stock B will make around 44HP @13200 at the sprocket thus the crank power will be only +5% on this.
The big issue with the engine is the straight line ignition and this dictates the pipe is VERY short for peak power at 13200.
I cannot give you any more info at this point as my very expensive video card has let out the smoke - due to constant use on EngMod
to design the D model pipe for TM.
Hopefully I will have a new 5MHz overclocked rocket computer running in the New Year.

[varthrix]

Frits, sorry about missing out on information. I just measured up and came up with this.
Reed petal area - 243.09 mm2
Total reed petal area - 972.36 mm2
Area of reed cage entry from carburetor flange side - 930 mm2
Reed lift 5 mm
Reed cage angle 60°
Reed stopper angle 16° ( Relative to the reed itself - assuming it's flat (0°))
Carburetor area (28 mm bore) 615 mm2
Inlet port area 619 mm2
So pretty much I have no idea if the reeds are suitable, got them for about $3, everything I did on the engine was in the spirit of buckets - low or no cost and diy. Most expensive part I bought was the carburetor - 50$. Even the cylinder liner was free, found an old wheelcart bushing and machined it on the lathe. I hope I can squeeze out some power out of it, there is a word that there will be a Simson cross race this year and if all is well I hope that I can participate.

Attached a drawing of the measurements, excuse my poor drawing and writing skills.
Also thanks for the time spent helping me out.
Kind regards
Jordan

[Twopints]

Hi All I hope this is a good spot to put this , I am trying to find some information about the Yamaha RD48 and RD56 engine A 250cc Disk valve twin, 1961 to 1964

The crank diameter and length

Disk valve diameter

conrod length

piston compression height

would any one know if any of these motorcycles sold to customers or purely works bikes

[F5 Dave]

Presumably you've read this

https://www.amazon.com/Yamaha-Racing.../dp/1852239204

Can't imagine any escaped the clutches of the factory.

[Frits Overmars]

Hi All I hope this is a good spot to put this , I am trying to find some information about the Yamaha RD48 and RD56 engine A 250cc Disk valve twin, 1961 to 1964
The crank diameter and length
Disk valve diameter
conrod length
piston compression height
would any one know if any of these motorcycles sold to customers or purely works bikes

To the best of my knowledge neither the RD48 nor the RD56 were ever sold; they were pure works bikes and it won't be easy to find any information about them after more than 50 years. The best I can do is a couple of lists and drawings from the RD56 and the 125cc RA41 which had the same relevant dimensions as the 250cc RD48. Working from the known bore dimension you may be able to extract approximates of the other dimensions you were asking about.


You made me curious: what are you planning to do with those dimensions? Build replicas maybe? And while you're at it, you might tell us a bit about yourself as well.

[husaberg]

Hi All I hope this is a good spot to put this , I am trying to find some information about the Yamaha RD48 and RD56 engine A 250cc Disk valve twin, 1961 to 1964

The crank diameter and length

Disk valve diameter

conrod length

piston compression height

would any one know if any of these motorcycles sold to customers or purely works bikes

Pretty sure the "Dutch Yamaha Fairy" has built a replica
https://www.pressreader.com/australi...83102773739289
http://www.classicyams.com/early-fac...56-250-cc.html
http://blog-883r.jp/archives/52479023.html

[ranasada]

Jordan, all these programs claiming to calculate a FOS-pipe were created without my involvement.
Moreover, many of those programs are based on obsolete data, so I won't comment on any of them. Here is my recent version.

Ranasada, see my above answer to Varthrix.

The TM-B pipe you have shown is not close at all.The stinger of a stock engine is 24mm for example.
And a stock B will make around 44HP @13200 at the sprocket thus the crank power will be only +5% on this.
The big issue with the engine is the straight line ignition and this dictates the pipe is VERY short for peak power at 13200.
I cannot give you any more info at this point as my very expensive video card has let out the smoke - due to constant use on EngMod
to design the D model pipe for TM.
Hopefully I will have a new 5MHz overclocked rocket computer running in the New Year.

thank you Frits and Wobbly for your answer.
i take misures from homologation form for finding setting in inversal way having fixed pipe, so i find that the big problem is on D5 (from Frits attachement) that is 26 and it is for more than 70hp. Why so bigger?

[Frits Overmars]

i take misures from homologation form for finding setting in inversal way having fixed pipe, so i find that the big problem is on D5 (from Frits attachement) that is 26 and it is for more than 70hp. Why so bigger?

I suppose the diameters on that sheet are external. Internal diameters on a homologation sheet wouldn't make sense; nobody would be able to check those without cutting the pipe up.