ESE's works engine tuner

[Frits Overmars]

Bugger - dxf not allowed, can admin change this please.

Zip it Wob
Oops, that may have come over pretty rude. What I wanted to say was: put everyting you want to post in a zipfile. That's an accepted file format. 3 cone pipe.zip

[TZ350]

Page 1590 .....

Aprilia closed their big end pins with conical plugs, but that wouldn't solve the aux/transfer short circuiting either.

Past experience tends to point into the opposite direction: circlips can be very good at causing disaster.

And what about that 3 piece pin? Well, what about acceleration values of 5000 g around BDC and 7850 g around TDC (Aprilia RSA at its 14500 maximum rpm)?

Do you think any built-up contraption would stay together long enough under that kind of stress? You're right about that, providing you use circlips at all. That is why I did away with them and click my plugs straight into the circlip grooves.

The issue is not the volume of the remaining space, but the cross flow area of the leakage path between auxiliary exhaust ports and transfer ports.

Turning to the simplest solution I could think of: leave the circlips out (saves weight) and click the plugs directly into the circlip grooves. They will work fine in combination with a normal piston pin (saves a huge amount of money compared to a Pankl pin) and it reduces the aux/transfer leak path better then even the latest domed Pankl pin, shown in the picture below-left. Right is my simple, very light plug.

There were never any lubrication problems, only a problem when someone used plugs, designed for a Simson piston, in a Kreidler piston which has different circlip goove dimensions. One plug came out, passing through the engine without doing any harm, but then the piston pin started wandering sideways, scraping the cylinder bore.

Most of the research went into finding the proper plug material. And since I don't expect I'll ever get rich from selling plugs, I'll let the cat out of the bag:
the plugs are made of Torlon. The stuff ain't cheap, but you'll get about 20 re-usable(!) plugs for the price of one Pankl pin.

Attachment 326134 Attachment 326135

Is it 4301? At least available easily enough.

http://nz.rs-online.com/web/p/plastic-rods/2577136/

Yep, that's the stuff. Like I said, it ain't cheap.

With a pumper if you have over run richness, then the pop-off is too low and or the lever height is too high.

this my truing tool. 2 lasered vertical plates and 2 lasered v's:

Attachment 326165

was only few bucks to get the stuff lasered and can be upgraded with small bearings + discs to balance cranks.

[Mental Trousers]

OK, found the old drive - here is the dxf and a couple of pics.
Bugger - dxf not allowed, can admin change this please.

As Frits said it's best to zip it up then upload it.

[FastFred]

.

https://youtu.be/JY9mrKR5SkA

Real racing ... MotoGP Historic Battles -- Rossi vs Stoner Laguna Seca 08'

[emess]

starting with blowdown and transfer STA matched to the targets in Engmod
then increasing transfer STA above the the target (keeping the same blowdown STA)
the simulator shows better midrange and peak power with no losses over the normal powerband
So the question is...
should you stick to target STA values or believe the sim results and go with the higher transfer STA?


Mick

[wobbly]

All depends upon the scavenging model you have assigned.
If you have crap transfer duct/port geometry then increasing the STA, over and above the code estimation, is what you should do anyway.
But if you are using the Aprilia scavenging model, then this has been proven to be accurate enough to believe as is.

[peewee]

A counter balance shaft might be okay for a generator side of things i had that idea myself, but i think it would be not so great for timing as it would have a fair bit backlash built in.thus the timing could be a little eratic.
The Aprilias had a pickup sensor built into the crank wheel as did the ROC/swissauto/pulse.

ill have some photos when I get a free moment. I want to take off the cylinder and side covers to have a look inside

[emess]

All depends upon the scavenging model you have assigned.
If you have crap transfer duct/port geometry then increasing the STA, over and above the code estimation, is what you should do anyway.
But if you are using the Aprilia scavenging model, then this has been proven to be accurate enough to believe as is.

Doh! Thank you Wob. I couldn't see the wood for the trees.
I do indeed have crap transfers in the sim as there is not much inner wall to play with.
Maybe a thicker liner would help.

[wobbly]

Yes its all to do with the effective Cd of the port sets.
An Aprilia sim would appear to favor the transfer STA over the all important blowdown.
But careful analysis shows that the big radius on the Ex roof dramatically increases the "real " STA as Jan developed the flow regime on
his test bench.
If the Cd is taken into account then the STA figures make sense completely.

[adegnes]

New episodes of my vlog out now!




Please let me know if I should quit posting links to my videos here, don't want to be a spammer!

[TZ350]

Very interesting, please keep posting about what you'er doing.

[trevor amos]

Adegnes, I`ve enjoyed your videos and much admire what you are doing, so carry on posting

[adegnes]

Very interesting, please keep posting about what you'er doing.

Adegnes, I`ve enjoyed your videos and much admire what you are doing, so carry on posting

Thanks! Means alot!

[wobbly]

Im a single malt guzzler myself, but whats the rum you are sampling ?

[adegnes]

Im a single malt guzzler myself, but whats the rum you are sampling ?

Ron Bucanero, cheap stuff I picked up in Denmark on vacation. Wish it was a bottle of Mount Gay.
I'm fond of single malts too, particularly the peaty stuff like Laphroaig.