ESE's works engine tuner

[TZ350]

Attachment 349151
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Plus +++1 ...... Happy Birthday Jan.

[lodgernz]

I can't be arsed formatting it
But I have a few spreadsheets to put into one document one day it is not pretty.
Attachment 349148
There is double-ups and you will need to double check and there is likely a few 4ts
CLICK ON IT 3 TIMES

I'm sure we would all appreciate an Excel file of all that.
Looks like there are some entries lost at the top. Were those 4T?

[katinas]

Happy Birthday Jan.

[Muhr]

I tried to convert to excel, do not know how well I succeeded. Someone is welcome to take a look!

So I have not proofread everything, only converted and cleaned it up with macro

[lodgernz]

I don't know where I got this, but probably on this thread.
Conrods.xls

[Condyn]

More connecting rods. http://www.transcanimports.com/downl...ing%20Rods.pdf

[husaberg]

Sorry i am late happy birthday Jan.


side note the Merlin was of course a 4V/cylinder

[Muhr]

These pictures pop up from time to time. Does anyone have information about this change?

[Frits Overmars]

These pictures pop up from time to time. Does anyone have information about this change?

Your pictures show an Aprilia RSA125 with 'improved' crankshaft. The original crank wheels had flat inner surfaces that were 16 mm apart. My RSA125 pics are not too clear but the picture of the two RSW250 cranks shows what I mean.
Then, after Jan Thiel went into retirement in 2008, some geniuses at the factory grabbed their chance to 'correct' the crankshaft, fitting aluminium stuffing disks to the insides of the crank wheels in order to reduce the crankcase volume.
Now apparently the crank has become 'even better' with full steel wheels. Yet everybody wonders why a 2009 RSA125 was slower than the 2006 version...

[Muhr]

Your pictures show an Aprilia RSA125 with 'improved' crankshaft. The original crank wheels had flat inner surfaces that were 16 mm apart. My RSA125 pics are not too clear but the picture of the two RSW250 cranks shows what I mean.
Then, after Jan Thiel went into retirement in 2008, some geniuses at the factory grabbed their chance to 'correct' the crankshaft, fitting aluminium stuffing disks to the insides of the crank wheels in order to reduce the crankcase volume.
Now apparently the crank has become 'even better' with full steel wheels. Yet everybody wonders why a 2009 RSA125 was slower than the 2006 version...

Ok thanks for the explanation Frits! So this milling is a further development in the same spirit as the crankshaft. When they noticed that the engine got worse with less volume!?

[husaberg]

Your pictures show an Aprilia RSA125 with 'improved' crankshaft. The original crank wheels had flat inner surfaces that were 16 mm apart. My RSA125 pics are not too clear but the picture of the two RSW250 cranks shows what I mean.
Then, after Jan Thiel went into retirement in 2008, some geniuses at the factory grabbed their chance to 'correct' the crankshaft, fitting aluminium stuffing disks to the insides of the crank wheels in order to reduce the crankcase volume.
Now apparently the crank has become 'even better' with full steel wheels. Yet everybody wonders why a 2009 RSA125 was slower than the 2006 version...

I had read before re the crankstuffing but I assumed he was meaning this bit?

[Frits Overmars]

Ok thanks for the explanation Fritz! So this milling is a further development in the same spirit as the crankshaft.hrWhen they noticed that the engine got worse with less volume!?

Your guess is as good as mine, Muhr. Ask the geniuses .

[Muhr]

Your guess is as good as mine, Muhrz. Ask the geniuses .

Lucky you're such a generous man when it comes to other people's shortcomings Frits.

[TZ350]

.


I am a great fan of increasing the crankcase volume. Or more exactly the volume at the start of the transfer ducts. So that the pipe has a bigger volume of mixture to suck up into the cylinder. Triming the inside of the flywheels and fitting a longer rod with corresponding cylinder packer for extra volume under the cylinder. The idea about increased crankcase volume posted by Frits and Jan from their days at Aprilia have worked well for me.

[jamathi]

Your pictures show an Aprilia RSA125 with 'improved' crankshaft. The original crank wheels had flat inner surfaces that were 16 mm apart. My RSA125 pics are not too clear but the picture of the two RSW250 cranks shows what I mean.
Then, after Jan Thiel went into retirement in 2008, some geniuses at the factory grabbed their chance to 'correct' the crankshaft, fitting aluminium stuffing disks to the insides of the crank wheels in order to reduce the crankcase volume.
Now apparently the crank has become 'even better' with full steel wheels. Yet everybody wonders why a 2009 RSA125 was slower than the 2006 version...

Was the 2009 RSA really slower than the 2006?
Are you 100% sure? Dyno test?
I tried to ask the dyno-man but he did not respond me....
He simply said that the crankcase volume was too big!
They also tried a Honda-type exhaust port/duct.
He admitted that this was worse, 1,5HP less.
I think he should have known better after al the broken exhaust bridges we had at DERBI!!!! Not ONE cylinder lived longer than 6 weeks....
Is there any other reason why a reduced crankcase volume could be better?
Throttle response?
What would be the upper limit of crankcase volume?