ESE's works engine tuner

[TZ350]

The head is off with Flettner to have the combustion chamber machined.



In the meantime I have been using EngMod to explore what needs doing to get the required STA's.



The blowdown STA is the critical one as that pretty much defines what is possible followed by the transfers. Wobs advice is to go a little higher on the transfer STA to make up for any short comings in their real life flow characteristics.

Methanol+15%Nitro

I think that next year I will try for a rule change allowing model aeroplane fuel. Fuel for kids toys, cant be any harm in that, and we need to get more kids into Buckets, MX85's and all that, right.

Seriously I hear there is another TF100 project happening, Flettner is building it and if it comes off we will get to test it on the dyno and take it out to the track...

[Ocean1]

SO the ring shape about 4mm larger than the crankpin is only witness marks.... from the rollers....

Think so. Also, look at all of the other marks on the inside surfaces, either someone's ground the pin in situ, (unlikely) or the rod's a) had an almost full width beam and b) has floated so far sideways that it's begun to do a similar job...

[Ocean1]

Doubt that the marks on the bronze would be the rollers, as for sure they would be encapsulated by the cage - unless that crank has had a cage failure.

Perhaps the cage made the marks? Or the side of the rod journal. Either way, from the cracks and surface colour it looks like the bronze has worn far more rapidly than normal, there's been violence committed inside that unit.

[TZ350]

I have just managed to get a set of three stage power valves.



It looks like the RGV250 three stage timings are:-

104 atdc
90 atdc
84 atdc

I am not sure how much these can be changed but I would like to have fully open at 80 atdc.

[Bert]

I have just managed to get a set of three stage power valves.



It looks like the RGV250 three stage timings are:-

104 atdc
90 atdc
84 atdc

I am not sure how much these can be changed but I would like to have fully open at 80 atdc.

Looking forward to seeing this unfold Rob.
Having seen Mike's one and Scotty rocket many years ago; I'd always wanted to build one (even had all the parts for it)....

[Muciek]

How far the blades are from piston? Could You take for me a foto looking from outside of ex port?

[TZ350]

How far the blades are from piston? Could You take for me a foto looking from outside of ex port?

I wont be back in the shed for a day or two to take a photo but from what I could determine the gap was very close 0.5mm or so.

[husaberg]

There is a tiny bit of gold buried in here, can you find it Rob...

[chrisc]

Interesting read, thanks for posting Husa. How old is that article out of interest

[husaberg]

Interesting read, thanks for posting Husa. How old is that article out of interest

This one i did not scan, but stole from the 2SMX site but i'd say 76-78 as it was a M model.....
Guessing the physics have not changed though.........

below nice pic of atac.

[wobbly]

Ha Ha, amazing - guess who just got the job to do the solid modelling for CNC machining new replica head chamber shapes made on the Webco dies.

[Grumph]

Ha Ha, amazing - guess who just got the job to do the solid modelling for CNC machining new replica head chamber shapes made on the Webco dies.

Those webco heads were much better than some OE for finning area...Are they wanting OE replica shapes or are you sneaking in improvements ? Ask if they'll list unmachined heads too if you would please...

[husaberg]

Ha Ha, amazing - guess who just got the job to do the solid modelling for CNC machining new replica head chamber shapes made on the Webco dies.

Did you see the "gold" buried in there Wayne?
show us a piccy......

[wobbly]

Honda solid copper head ?

All I have at this stage is the CNC shape to do the first head for a 250 twin.
But will keep you lot informed as the project advances.

[husaberg]

Honda solid copper head ?

All I have at this stage is the CNC shape to do the first head for a 250 twin.
But will keep you lot informed as the project advances.

12 pounds of it they must have thought it was worth it