Question about PP motors.

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Jan 4, 2004 | 04:08 PM

#26

Shamrock.James

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Joined: Nov 2003

Posts: 98

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From: Sydney, Australia

Quote:

Originally posted by j9fd3s
the nsu wankel spider front side housing is very thin in comparison to mazda's, so it is possible to do something like this, i question the benifits however, especially in relation to the cost involved

the benefits will be much more apparent when you have a 5 rotor engine which is now a foot shorter, more important though is the e-shaft stability, meaning you will be able to reach higher RPM's much more smoothly.

Also from what i can see a redesign may significantly help with the distribution and flow of both oil and coolant, and the no. 1 reasons these engines die is casue they get too hot.

Jan 4, 2004 | 06:27 PM

#27

chairchild

50mpg - oooooh yeah!

Joined: Mar 2003

Posts: 527

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From: UK

Quote:

The splined shaft is a nice idea but there is the problem of clearance, you'd need some clearance to slide the lobes on but that would mean some backlash on the splines which would cause all sorts of problems as the eccentric shaft wouldn't be acting as a solid shaft.

Interference fit would solve that. freeze the keys and shaft, then force them into place via a hydraulic ram - then SLOWLY let it warm up. I knew that pic had bits in the wrong way round, but I was only interested in the intermediate plate anyway

Quote:

You will have to have a toothed shaft like you originally stated and it will have quite strong, now as for the rotor lobes you could make the rotor lobes longer as each rotor has an intermediary plate in front or behind it so you get a giant chunk of cylindrical metal, that then leave 8mm (width of the intermediary plate alone... then you lathe the rest down to create the lobe shape required, so you will have the smaller lobe cutout attached to the larger sized original full piece of cylindrical metal.

now this would slide down your new "key shaft" the larger end would go into a bearing in the intermediary plate and you would just have the lobe sticking out onto which the rotor would go.

Not quite following, are you suggesting making the spacer as part of the lobe? Which would make it HUGE - increasing rotating mass and inertia. The spacers in my idea could just as easily be bearings, and can be easily replaced if they needed to be.

and image the cost for the size of bearing you'd need for a spacer the size of the total lobe movement - best keep it as small as possible for cost reasons.

I can honestly see me trying this in a few years time