That's weird, it'll never work I can see why he said the pattern maker had brain fade. There's no room for the bore and the ports are no good and I can't see the transfers at all. Oh well next time hell get it right.
No8 Wire Extraordinaire
That's weird, it'll never work I can see why he said the pattern maker had brain fade. There's no room for the bore and the ports are no good and I can't see the transfers at all. Oh well next time hell get it right.
Don't you look at my accountant.
He's the only one I've got.
Muddler/Dabbler.
Yes, lets hope he does get it right next time - if this was for a large production run then I guess the foundry, patternmaker or whoever was doing the cores, will be able to absorb the cost of the cockup but if it's for a one or two off job then bang go the profits!Originally Posted by F5 Dave
I'm amazed that even the proof casting actually went ahead though, ie. without any core setting problem (or whatever) being detected!
Transfers did you say?? what transfers?
PS guess it's 2T all the way for you, 4T doesnt't compute - I would be inclined to agree with you there! - however 4T would also interest me but for the extra complication, size, weight cost etc. etc!
No8 Wire Extraordinaire
Yeah and they only fire 1/2 the time and make forty noises. Folly if you ask me.
Don't you look at my accountant.
He's the only one I've got.
Forum whore
Here is the crankshaft for my 2 x 25cc cylinders. Horrizontally opposed twin.
Here is where I want to put it. A pre rotater engine for the gyro, not used in flight, only to get the rotors turning before you roll forward for takeoff. Need 5 / 6HP with no weight.
The spiders are going to get a fright soon enough.
Forum whore
Here we are slowly moving on with the new RG cylinder.
Muddler/Dabbler.
I did wonder what you were going to do with a twin 50! - Will it need some sort of clutch as well ?
Guess it won't need a real big radiator - how long will it be used for each time?
Have you settled on how to approach the chrome bore problem? I was going to say earlier that Briggs & Stratton have been flash plating their aluminium bores sucessfully (not sure exactly how it's done) for probably 60 years!
Forum whore
There needs to be a gear reduction in the system ( before the bendix ), this will be a planetary gear system with a clutch band around the outside. Stop the ring turning to provide drive, simple. I'm still not sure on the bore, just it can't cost anything. I know Frits does not like the brass sleeves idea but it only needs 2.5 / 3 HP per cylinder, I think I can get away with that. I can get the cylinders chromed here in Hamilton for bugger all ( on to brass ), and grind them myself. Only has to run for approx two minutes at a time.
Forum whore
RG cylinder, now, that looks interesting .....
Muddler/Dabbler.
I did talk to an electroplating guy here in Auckland about doing some small cylinder liners a few years ago and he more or less said the same thing (ie brass was by far the best for chroming)
He also said that the chrome is always deposited thickest at each end of the bore and might have to be ground down there a couple of times during chroming in order to allow the depth of chrome in the middle to keep up.
Muddler/Dabbler.
I'm not too familiar with posting attachments here, does anyone know how I can attach a PDF file in a post? - guess there must be a way, its just that I haven't found it yet
Low personal B.M.E.P.
Guzzi did thousands of chrome bores in the 50's and 60's. Apparently, they used a barrel shaped anode to even out the chrome spread.
Having worked with a plater here in ChCh on trying to recover worn crankpins, it was apparent (1) most hard chrome applications need an anode shape unique to the job...and (2) A lot of platers won't listen cos "they know best".....
Anorak
attachments next to the smiley faces looks like a paper clip there are size limitations thoughI'm not too familiar with posting attachments here, does anyone know how I can attach a PDF file in a post? - guess there must be a way, its just that I haven't found it yet
Kinky is using a feather. Perverted is using the whole chicken
Forum whore
Hard chrome plates here in Hamilton do aviation cylinders so they are aware of the anode requirements for cylinders. I'll just have to make something special ( small ) to suit my cylinders.
Low personal B.M.E.P.
Another option is a "transplant" coating....It's a bit difficult without pressure diecasting though, but maybe...
what happens is a steel mandrel of the correct OD for the new bore size is prepared - hard chromed and highly polished.
the bore surface is then applied to the mandrel OD - usually nicasil or similar but "spraysteel" has been used too which is just as it suggests, metalsprayed steel.
The mandrel and coating is put in the mould hot and the casting done...
the mandrel should press out leaving a parallel bore...
If you wanted to key it to a sand casting, it might be possible to metalspray the od of the coating with aluminium. There were outfits doing metalspraying all over NZ but they seem to have dropped away of late.
Muddler/Dabbler.
What you've said about Guzzi is very interesting, in fact all of what you've said (including (2) ).
A lot of guys are in a rut and so used to doing things a certain way (inside the square) that they will never improve by looking outside the square.
Others, by taking a chance and accepting the odd failure while trying something new, can hit the jackpot! - and I must say there are plenty of those in Bucket circles!
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