ESE's works engine tuner

[dinamik2t]

I like to mess with things a lot! Actually, the original idea was to use the whole protractor as is, with a small metal ruler like now. Eventually, it didn't fit the 54 bore and as a waster greek I am, I destroyed the second. (sorry, cynical political comment)
But sure, I stand corrected Frits. Mine looks more fancy though.

[teriks]

quallman1234, husaberg:
The Bishop (+Illmor-Mercedes) take on rotary valves.


"To demonstrate the credibility of Bishop Innovation’s new rotary valve technology it joined
forces with Mercedes-Ilmor to develop the technology for use on their V10 Formula One
engine only to have its strategy destroyed by a change in engine regulations. "

"By late 2000 back to back testing with the poppet valve
single cylinder engine demonstrated a 10% power advantage and improved durability."

Source: http://home.people.net.au/~mrbdesign/PDF/

Four-stroke I know, but if you split that rotary valve in half, you basically have what I use for intake valving. -See, I managed give it some two-stroke angle

[twotempi]

A couple of questions for comment.

1) Why do 14mm spark plugs get used. In a 125 twin or 50cc the spark plug takes up a fair part of the head area. Does anyone use 10mm or 12mm dia plugs ?? NGK appear to have a reasonable range of 10mm fine-wire plugs of the desired heat ranges. Assuming they are actually available

2) Carb primary or emulsion nozzle jets. What type would be better for methanol fuels. Would a shrouded emulsion type give better atomisation for this application with the increased fuel flow requirement of 2 - 2.5 times that of petrol ??


thanks

[TZ350]

The Wobbly Pirranha ....



Laid out all the pieces in order and the right way round and numbered them so that they are easier to sort when welding them.



Cleaned the ends and started a small lead on them so they go through the roller easily.



Fed them all the same way up into the roller and rolled them into more or less a circle.



Not perfectly round but I made sure the edges where they butt together are sitting flush.

Next move is to fusion weld and hammer the joints then roll the again so they are nice and round.

I should have left this job for Bucket, he has more patience than me ......

[Grumph]

A couple of questions for comment.

1) Why do 14mm spark plugs get used. In a 125 twin or 50cc the spark plug takes up a fair part of the head area. Does anyone use 10mm or 12mm dia plugs ?? NGK appear to have a reasonable range of 10mm fine-wire plugs of the desired heat ranges. Assuming they are actually available

2) Carb primary or emulsion nozzle jets. What type would be better for methanol fuels. Would a shrouded emulsion type give better atomisation for this application with the increased fuel flow requirement of 2 - 2.5 times that of petrol ??


thanks

14mm spark plugs are the common size for road motors as they are cheaper and less subject to damage from ham fisted owners...
In NZ there's a good range of 10mm available, probably better available in 12mm, and a limited range of 8mm. Ask Darbi's...

I can't say from experience which style of needle jet nozzle will suit bulk methanol flow best - I'd think it may depend on the application...ie cylinder size. Plain nozzles have worked fine with meth for me.
Vizard quotes a problem with fuel not emulsifying in a car carb which he solved by putting a knife edge on the nozzle - the ragged edge acted to break up fuel droplets better than a plain square edge.

[Gigglebutton]

The Wobbly Pirranha ....



Laid out all the pieces in order and the right way round and numbered them so that they are easier to sort when welding them.



Cleaned the ends and started a small lead on them so they go through the roller easily.



Fed them all the same way up into the roller and rolled them into more or less a circle.



Not perfectly round but I made sure the edges where they butt together are sitting flush.

Next move is to fusion weld and hammer the joints then roll the again so they are nice and round.

I should have left this job for Bucket, he has more patience than me ......

Im working on my buckets tomorrow night & hopefuly Saturday morning. Pop in and ill weld it up for you if you want

[dinamik2t]

Wob, may I ask an EngMod question. I want to simulate a Vforce reed valve.
What I do, is measure every dimension as a normal reed valve and for the angle I measure & use this one:


It looks obvious, but I am not sure. Vforce pyramidic triangles are not isosceli (greek plural of greek word isosceles ), like most reed valves.
The above angle measures 23.5 degrees and eff. diameter is ~41 over 43.5 of the conventional equivalent valve.

Furthermore, would you care to give an insight on why we don't see vforce on road race bikes?

--------

Can't wait to see the piranha ready TZ!
I liked the small description on the manufacturing. Please add more on the next phase.

[wobbly]

Here is a Banshee VF3, all you can do is measure the angle between the reeds as you say.
Any small inaccuracy in the geometry isnt worth worrying about.
VF reeds work really well on road race bikes - an RS125 Honda makes better mid and top end with a CR125 VF2, we have done dozens of tests on this.
The VF3 for this model isnt as good and chips petal tips.
All the sprint and road karts here use them, but only a few road race bike riders seem to know.

[dinamik2t]

I see..
Me too saw a clear difference in favor of the VF in EngMod, that's why it seemed odd.
Mine comes from Arctic Cat 500/600 Twins and here's a shot if anybody needs the dimensions:

[quallman1234]

All the sprint and road karts here use them, but only a few road race bike riders seem to know.

Thanking you sir. Next upgrade for my RS then!

[speedpro]

An advantage i see with the VF reeds is the tuned length of the reeds. In a conventional reed block if the free length is restricted for tuning purposes the effective area is reduced which is compensated for by going wide. With the VF reeds they are stacked so I see a better shaped reed block and port.

[richban]

Hey Guys

What's the stuff you have been using to build up ports etc. I had a look through but could not find it. Am making a manifold and need to match carb spigot nice.

Cheers Rich

[bucketracer]

Devcon F, you can get it from Blackwood Paykles in small tubes like 5min Araldyte ($25) or big tins of putty ($175). I think Fishy sells it or something similar too, but cheaper.

[F5 Dave]

JB weld is good too (bought on TM ages back) & better for self leveling stuff, Devcon better for forming shapes as its thicker. Copes with inlet temp just fine. Not so much on ex side, maybe for several min.

[wobbly]

RS Components sells Devcon F in the tins for around 1/2 what Paykels want.