ESE's works engine tuner

[fixer]

Woo hoo! ... The Team ESE dyno is up and running again after some ... er ... minor computer issues. So we put the RS50 Aprilia back on and experimented with a couple of different adaptors in the exhaust header. The result ... 130hp at just over 6000rpm! Can't wait to get it on the track.

[speedpro]

That's not bad for a 50

[chrisc]

That's not bad for a 50

Only 2,600hp per litre. Definitely room for improvement though. I hear those 50s can go out to 3,000 hp per litre

[TZ350]

Woo hoo! ... The Team ESE dyno is up and running again after some ... er ... minor computer issues.

Yep there is the proof Wob, 130hp,

Just by lifting the barrel, and a bit of guess work you can do wonders with a 50, easy as ....

Seriously its great to have the dyno sort of working again, and its a big thanks to Fixer for his efforts and the donation of a suitable computer. Now at least we are back to being able to tell if something has made an improvement or not.

We will get the proper config file from DynoJet soon and it should all be back to normal.

[RomeuPT]

Romeu what fuel are you running - and I assume by your 6,5 you really mean 0.65mm squish.
When you are running big volumes like you are talking the plug is way too far from the piston and you need to change to a toroid.

Thank's for the reply.

Fuel, unleaded petrol 98 (portuguese)

I mean the squish band, 8mm is right at 50%. 6,5mm is less, I am not sure if is really important to keep around the 50% squish band for power production.

This is using a Domed top piston.

Before I knew the toroid was for flat tops I tried a stock Honda RS 125 toroid, totally losed power, mostly peak, I even tried to change the curve of the ignitech and checked the plug but didn't go any better.

Thanks.

[TZ350]

http://www.quincylooperracing.us/subpage99.html

Konig Factory Tour.

[wobbly]

Romeu
What is the dome radius, or dome height of your piston.
I will do a sketch of a toroid for you to suit 98 pump and the domed piston..

[RomeuPT]

Romeu
What is the dome radius, or dome height of your piston.
I will do a sketch of a toroid for you to suit 98 pump and the domed piston..

2mm.

I am using a rs piston at the moment, with 0.8 ring. I think is an ART piston. other domed piston I use are the same, 2mm.

thanks

[wobbly]

Running 98 pump I would go to 13.8 : 1 and no more - this would give you 9.7cc combustion vol or 11.9cc to the top of the plug
with a 10 range plug.
The 17mm shown is the thread length for the plug to ensure the tip protrudes into the chamber.

[RomeuPT]

Running 98 pump I would go to 13.8 : 1 and no more - this would give you 9.7cc combustion vol or 11.9cc to the top of the plug
with a 10 range plug.
The 17mm shown is the thread length for the plug to ensure the tip protrudes into the chamber.

Thanks.

I believe you are giving the best advice. I got to try it sooner or later.

I am confused because using the Honda toroid (I think it is around 11,2cc) I lost big power, using the 10cc hemi head (That I am thinking to cut) I lose a litlee peak and a lot overrev. The 10.5cc bathtub does everthing good, and now the 11cc seemed to improve peak/overrev. That's is why my ideia was to go even lower cc with a bathtub design..

To remenber the engine specs besides the cylinder and head are:

- Ignitech DCCDI-P 15/16º at 12500
- 800 mm pipes.
- vforce 2 for cr 125 with hand made straight flange for 38 carb
- Mik TMX 38, no filter, big hand made air box

[wobbly]

If you are running 800mm pipe then you should also be running 200* Ex - is this the case ?
There are two types of Luyten cylinders, one for the 835mm "customer" pipes and the other for the "A" kit 800mm type.
The A kit setup is designed to be run with completely different ignition curve and powerjet switching as it runs to 14,000 +
the customer setup is 1000 revs short of that.
Here is a dyno sheet showng a very good customer RS125 with one of my pipes, a full factory A Kit setup, and the same setup with my pipe ( Blue )
all showing rear wheel Hp.

[TZ350]

.

All the Hot action at Taupo. https://flic.kr/p/nx7zvN

[RomeuPT]

If you are running 800mm pipe then you should also be running 200* Ex - is this the case ?
There are two types of Luyten cylinders, one for the 835mm "customer" pipes and the other for the "A" kit 800mm type.
The A kit setup is designed to be run with completely different ignition curve and powerjet switching as it runs to 14,000 +
the customer setup is 1000 revs short of that.
Here is a dyno sheet showng a very good customer RS125 with one of my pipes, a full factory A Kit setup, and the same setup with my pipe ( Blue )
all showing rear wheel Hp.

almost 50 rwhp is brutal

I am running 198º exhaust. With a 96 RS NX cylinder.

Squish is around 0.8mm. The transfer timing is stock, but gives around 136 main, 133/132 second and rear port. I know, lowering the cylinder and raise the exhaust to 200º to get similiar to a A kit.
I don't want to keep spendig much more on this project, I am starting a banshee project after this, just thinking to find a head that works better for what I want, play around with what I got and leave the engine like it is.

The green line on the dyno is with a 835mm pipe?

I feel that my engine does peak around 13000 rather than 12500, because of that I have been advancing the ignitech slowly each time, and is getting better. Without a dyno I don't go much far.... :/

Thanks for your time.

[wobbly]

The green line is a "stock" RS125 with 195* Ex and 835 pipe and powerjet switched at 12200.
The kit setup has 200* and 800 pipe with powerjet switched at 12800.
I wonder if your 98 pump fuel is alot better than what we have here, as 10.2cc is the absolute limit running LL100 Avgas ( any less and it limits overev ) But using 98 with that head would
destroy our engines in seconds.

[RomeuPT]

The green line is a "stock" RS125 with 195* Ex and 835 pipe and powerjet switched at 12200.
The kit setup has 200* and 800 pipe with powerjet switched at 12800.
I wonder if your 98 pump fuel is alot better than what we have here, as 10.2cc is the absolute limit running LL100 Avgas ( any less and it limits overev ) But using 98 with that head would
destroy our engines in seconds.

Wheel, I did a couple of banshee pipes for a friend from Lisbon that tunes banshee's in his free time, told me that our pump fuel is bullshit, and he can only use with the 98 what the americans use with their 91 :/. So many times he uses avgas etc when drag racing. More tuners have talked about the problem, but talking may be just that.

Maybe one more reason for me to try a little lower compression.