ESE's works engine tuner

[RomeuPT]

Attachment 282983Attachment 282984Attachment 282985Attachment 282986

Using EngMod2T I simulated up some of the numbers Bucket came up with when he measured the GP's crankcase volume.

Attachment 282982

Blue line is 1.3 primary compression ratio and Red is 1.4 to 1, no other changes.

1.4 is a crankcase volume including transfer ducts of 517cc using a 105mm rod, 1.3 is 621cc with a 110mm rod.

I remember Frits suggesting using the crankcase as a plenum and Speedpro talking about the crankcase as a place to store air/fuel untill its needed. I guess I will be looking to add some more crankcase volume to the Beasts engine.

That is pretty interesting, before we change con rod lenght we should measure case comp, just to be sure it will not go too low.

being 1.3 the optimun or a baseline for reed induction race engines like was said before.

Regards

[FastFred]

....

Just heard, its true, TeeZee brought this Dark Side thing of Trademe.

[TZ350]

....

I wanted to see if it can be cut down into a side car platform and "now" your going to be the swinger, so

[Frits Overmars]

we should measure case comp, just to be sure it will not go too low. being 1.3 the optimun or a baseline for reed induction race engines like was said before.Regards

Better make sure your crankcase volume is not too small. I have seen lots of cases with too little volume, but none with too much yet. The optimum primary compression ratio is probably less than 1.3. And in case you really want to start messing with oil and measuring jugs, you will need this special tool, provided by the engine itself:

[wobbly]

In my testing I have found no more power going to a bigger than 1.3 case on a reed engine.
This is a function I believe of the efficiency of the rotary valve intake system being able to better fill the case at high rpm,using the 1.24 as Frits has described , but having said that
I have only just crept over 50 Hp with a 125 reed, and the Aprilia RV made alot more than that, so maybe a huge case simply isnt needed at the lower bmep.

[RomeuPT]

Better make sure your crankcase volume is not too small. I have seen lots of cases with too little volume, but none with too much yet. The optimum primary compression ratio is probably less than 1.3. And in case you really want to start messing with oil and measuring jugs, you will need this special tool, provided by the engine itself:

I Never had burned a hole in a piston...

That is a really low volume crank, the piston is just saying, measure the sh** you have done

[fatbastd]

All,

I might be onto a coupole of bare RS125 frames (with swinging arms) available overseas. I have no imemdiate need (though I wish I did), and could probably get them to NZ with minimal fuss (I get a VERY good deal with FedEx - guessing, but maybe for $120-ish for shipping). What would they be worth to someone? There's no suspension or tanks.

FB

[husaberg]

All,

I might be onto a coupole of bare RS125 frames (with swinging arms) available overseas. I have no imemdiate need (though I wish I did), and could probably get them to NZ with minimal fuss (I get a VERY good deal with FedEx - guessing, but maybe for $120-ish for shipping). What would they be worth to someone? There's no suspension or tanks.

FB

Def be into getting a NX4 frame...........

[TZ350]

Made it through to the 2013 proposed changes, so maybe it might fly.

http://www.mnz.co.nz/docs/default-so...e.pdf?sfvrsn=2

Bert was talking about single event Licenses but amongst the proposed rule changes is this one that appears to allow unleaded pump fuel with 10% ethanol like Gull 10 (http://www.gull.co.nz/fuel-products/gull-force-10/) and 18% other Oxygenates whatever they are.

[TZ350]

http://toxics.usgs.gov/definitions/fuel_oxygenates.html

Fuel Oxygenates

Definitions

Fuel Oxygenates - "Oxygenates, when added to gasoline, are designed to add oxygen to the gasoline, thereby decreasing vehicular carbon monoxide emissions and oxone levels in the atmosphere." - U.S. Geological Survey, 2006
Fuel Oxygenates - "Fuel oxygenates are a group of chemicals that raise the oxygen content of gasoline. The presence of oxygen optimizes oxidation during fuel combustion, resulting in a more complete burn and a reduction of harmful tailpipe emissions of partially oxidized gasoline components from motor vehicles." - U.S. Environmental Protection Agency, 2009
Gasoline Oxygenates - "Gasoline oxygenates have been used in gasoline primarily to improve octane, reduce vehicular emissions and comply with the oxygen requirements of the 1990 Clean Air Act Amendments. While there are many different gasoline oxygenates the ones most commonly used in US gasolines are methyl tert-butyl ether (MTBE) and ethanol (EtOH). Tert-butyl alcohol (TBA) is both a trace component found in fuel grade MTBE, and is also a metabolite of MTBE biodegradation." - American Petroleum Institute, 2008
Gasoline Oxygenates - "Oxygenates are man-made chemicals that are added to gasoline to make it burn more efficiently. Adding oxygenates to gasoline increases the gasoline's octane level, and reduces pollutants (particularly carbon monoxide) emitted from motor vehicles ... Most oxygenates are either alcohols or ethers, which are readily soluble in water. Two commonly used oxygenates are ethanol and MTBE (methyl tert-butyl ether)." - New York State Department of Health, 2006.


Ok found this on Oxygenates, good old Google ....... 10% Ethanol plus 18% other Oxygenates, nothing in the rules that say I can't add my own Oxygenates only that there can't be more than 10% Ethanol and 18% of other Oxygenates ...

Hmmm I like this, a high octane fuel that is much cheaper than Av gas and I can run my fuel injection O2 sensor with it, watch this space.

[husaberg]

10.1.3
At all times the onus is on all competitors to ensure their machinery has enough fuel onboard
to complete any race
they start in, including allowance for any restarts that may occur, penalty for running out of fuel during any race, first
offence will be an instant fine of not less than $400.00
Reason: New rule


That's a bit of a interesting rule..............
Whats the point............

[kel]

[
Ok found this on Oxygenates, good old Google ....... 10% Ethanol plus 18% other Oxygenates, nothing in the rules that say I can't add my own Oxygenates only that there can't be more than 10% Ethanol and 18% of other Oxygenates ...

Hmmm I like this, a high octane fuel that is much cheaper than Av gas and I can run my fuel injection O2 sensor with it, watch this space.

Nope.
24-2-5 Fuel: See 10-17-1
Alcohol based fuel or fuel additives are prohibited.
Stupid rule. Why not change it to "only commercially available pump fuels may be used for this class". Would keep the cost down and the lead out!

[Bert]

10.1.3
At all times the onus is on all competitors to ensure their machinery has enough fuel onboard
to complete any race
they start in, including allowance for any restarts that may occur, penalty for running out of fuel during any race, first
offence will be an instant fine of not less than $400.00
Reason: New rule


That's a bit of a interesting rule..............
Whats the point............

Having been in the control box at minefield (with others on this forum). It was the lowest point (most sickening) in my involvement with motorcycle racing; while not the first time this one had the most impact on my views... This is a good control measure by MNZ to attempt to reduce the possible occurrence of this happening again.

Have a read in the racing section.

Yip,But,That was the coroners recommendation following the deaths of Derek Hill and Phillip Harrison at Puke in 08,No action was taken following that recomendation and since then we've had a similar situation at Manfeild which resulted in another death,Not a good look,Its an easy fix,Just deal with it.

[TZ350]

In my testing I have found no more power going to a bigger than 1.3 case on a reed engine. This is a function I believe of the efficiency of the rotary valve intake system being able to better fill the case at high rpm,using the 1.24 as Frits has described.

Ok with my EngMod2T rotary valve simulations, 1.24 is better than 1.30 but interestingly 1.29 and 1.28 were worse than 1.30.

[Frits Overmars]

I Never had burned a hole in a piston...

Don't worry Romeu, you're still young; you'll get your chance yet. BTW, it wasn't my piston; just a picture I picked up from the internet.