ESE's works engine tuner

[F5 Dave]

My limited experience with EGT probe was on my 50 which you will appreciate has a very small header. Just before a GP I got a nut welded on & fitted the probe at about 6" from piston & poking in to the centre of the header.

On the dyno & the temp kept rising with every gear change. power was suppressed several hp. Eek No time left, blocked off the hole, power returned as per normal, phew. Put on a shelf & pack up to leave.

I think the probe tube was overheating the returning charge. I should have tried it pulled back flush & just the thin bit of the probe in the stream. Its on the 'I'll get around to it' track.

[F5 Dave]

I looked at my KT ring last night. It too shows some polished areas & dull areas. Clearly not sealing well.

[Frits Overmars]

On the dyno & the temp kept rising with every gear change.

That's a classic sign that the probe is too slow for the application: too much thermal mass and too much isolation. If you really want to see the EGT go up and down with the engine power, you will need an open junction probe. Not as long-lasting as a shielded one, but much more informative.

[F5 Dave]

Yes but it was also getting waaay hot & power was suppressed so it wasn't in the ideal position I would think. it was quite a thin end (exposed tip) probe (last 8mm).

[richban]

My limited experience with EGT probe was on my 50 which you will appreciate has a very small header. Just before a GP I got a nut welded on & fitted the probe at about 6" from piston & poking in to the centre of the header.

On the dyno & the temp kept rising with every gear change. power was suppressed several hp. Eek No time left, blocked off the hole, power returned as per normal, phew. Put on a shelf & pack up to leave.

I think the probe tube was overheating the returning charge. I should have tried it pulled back flush & just the thin bit of the probe in the stream. Its on the 'I'll get around to it' track.

Good to know. Yeah well being a dirty 4 stroke the first 200mm of the header has an ID of only 25mm. So not much room to play with really. Will just have to try it and see what happens.

[F5 Dave]

I looked at my KT ring last night. It too shows some polished areas & dull areas. Clearly not sealing well.

Well I've got another hone of the cyl & it looks good & round & gapped a 0.2 ring so its a nice fit so it all has a chance of sealing now.

But the question is running bean oil (Castrol R) as I am going to try to get a good ring seal;

I hear anecdotal stories of it not blending with Av & possibly 98 (contains Ethanol now). I can't use Acetone to blend anymore I don't think. Is this right re Av? I might have to run 95 & make sure comm isn't that high.

[wobbly]

AvGas will separate out, and in some cases wont mix at all with many oils that contain castor.
Acetone fixes this, havnt seen any issues with pump gas.
In karts no mixing agents are allowed - but MNZ still allows this I believe.

[Grumph]

AvGas will separate out, and in some cases wont mix at all with many oils that contain castor.
Acetone fixes this, havnt seen any issues with pump gas.
In karts no mixing agents are allowed - but MNZ still allows this I believe.

Correct - but be aware that the Ethanol blends are not legal in buckets "alcohol based fuel or fuel additives are prohibited"
Not a prob in the SI as we don't yet get E10 but you Norfeners should be aware.

[NOID]

this should read

Correct - but be aware that the Ethanol blends are legal in buckets "alcohol based drinks are required".

[F5 Dave]

Great. Thanks Wob, Thanks Greg &, erm, thanks I think Noid.

[kel]

Correct - but be aware that the Ethanol blends are not legal in buckets "alcohol based fuel or fuel additives are prohibited"
Not a prob in the SI as we don't yet get E10 but you Norfeners should be aware.

Classic, the local fuel stations pump fuel is no longer legal for buckets. Think I may have to raise a protest against every 4 stroke that beats me

[richban]

Classic, the local fuel stations pump fuel is no longer legal for buckets. Think I may have to raise a protest against every 4 stroke that beats me

C16 is legal though, init? Kidding kidding. First you will have to get back on a bike if you want to get beaten by the 4 strokes. I like that your attitude.

[Grumph]

Classic, the local fuel stations pump fuel is no longer legal for buckets. Think I may have to raise a protest against every 4 stroke that beats me

Well good luck with that....You lot should be aware of Choppa's thread in the racing section Fuel samples are away being tested now.
The "main" classes have to meet fuel specs in the rulebook and funnily enough don't actually have the line I quoted...24-2-5.

The remedy if you think you need one is to put up a remit specifying that any fuel commercially available for road use is acceptable for miniature road racing....sidesteps the fuel specifications and keeps the rule current.

There is AFAIK no advantage running E10 - the calorific value is I think a bit lower than straight gas and the anti knock pretty much the same. E85 on the other hand, I can't wait till it's readily available and legal....

[husaberg]

Correct - but be aware that the Ethanol blends are not legal in buckets "alcohol based fuel or fuel additives are prohibited"
Not a prob in the SI as we don't yet get E10 but you Norfeners should be aware.

Great. Thanks Wob, Thanks Greg &, erm, thanks I think Noid.

Classic, the local fuel stations pump fuel is no longer legal for buckets. Think I may have to raise a protest against every 4 stroke that beats me

Greg is just being ironic
The pump gas must conform to FIM unleaded which is a bit of a F-up on the MNZ's behalf as it should have been unleaded Super
as per the rest. But regardless the FIM fuel spec allows for a aromatic content plus Buckets are "self policing"

The alcohol based fuel or additives means just that alcohol based.
E10 is still "based" on Petrol. it is a pump gas so the additives do not refer to how it comes from the pump but what is done to it after..........imo.
Intersting if Gull E10
80% is Gasolene
10% is ethanol
3% is Benzene
4% tolulene
Whats the rest?????????????

I am sure some will can remember the fuss over Aaron slight and Meklau(i think it was ) loosing points for running illegal fuel in about 93-94 in WSB
The authorities only tested 2 bikes, they both failed the fuel inspection.
Honda protested and had the points reinstated because ELF admitted everyone was running the same fuel ELF had supplied (by mistake),
Ducati (even though they had all run the same fuel as well) protested and the points were again taken of Slight and co and it was a shit fight all the season. Back and forth.The laywers got rich as per usual.
I think in the end Slight lost the points and a fair chance at the championship.

[Grumph]

Greg is not being ironic...greg is being literal.

Convince me that Ethanol in E10 is not (a) Alcohol....and (b) an additive to the base petrol...

Given that this is NZ and we only pay lip service to the FIM there's no requirement for us to try and match the FIM unleaded fuel composition - and a lot of very good reasons why our fuel regs should be based on what is actually on sale here...

A couple of years back the word was that E85 was going to replace avgas at least at the pumps at Ruapuna. I was told that most of the car formulae were going to run on it and that avgas as a race fuel would be phased out in NZ....hasn't happened due I believe to shortage of supply but it still could as the decision was based on what seem sound principles.