nother bang for bucks is water inj, just some water into your inlet keeps the carbon deposits away for better overall performance

interesting DD you found 1340cc to be the limit good stuff but to achieve 1338cc
most early A12 engines are too old to use 78mm bores but have heard of 77mm yet
sleeving is more affordable vs fitting A14 crank, rods, pistons bore honing etc.

Electronic Ignition won't make more power, but it does increase reliability & reduce maintenance. Not sure I'd call it a "bang for your buck"

I'm almost positive you could use a ceramic high RPM ball bearing pack to support two stainless precision ground tube valves with a .0002" slip tolerance.

I want to get a small engine to test this out.

e dizzie no engineer required but Im keen on the rotary valve head now :)
That saunders RV video haunts me

Does a new electronic ignition system need a engineer to sign off on it?

So to recap:
Quote:
* Shaving the head to bump up comp gains 1% hp, and is among the easiest (but requires removing the head)
* Swapping in larger engine up to 1346cc, can gain 10%
* Fit Mitsubishi 4G32B pistons, milled flat, for 1300cc ($75 + boring/balancing costs), 10% gain
* Fitting A14 crank & rods, head & cam, gains 16% (boring & balancing cost)
* Domed pistons with singh grooves, 14:1 compression maybe 18% gain (requires E85 or off-road-only racing gasoline)
* Increase revving. Gain 32% over 4,000 shifting. Cost: FREE
* Supertune your A engine. FREE, gain up to 72% over untuned engine

Did I miss any ideas?


Under NCOP self-certification (no engineer needed)
* Engine swaps up to 1346cc is allowed without engineering
* Engine swap of equivalent engine (newer, etc) up to 20% power more than original

I have only been able to find a single piston cylinder head for a motorcycle.

Didn't Suzuki sell a rotary-valve motorcycle?

Would that be a cheap bang for the buck mod to an A12, certainly no engineering is needed

I posted the Coates info many years ago and they spent big but is too complex to manufacture compared to the Saunders however the same ceramic coatings seem why they are possible.
This page shows some methods for education as ceramic coatings are used in jet turbines
and have come down in prices since their introduction hence rotary valve engines are possible
http://www.dynacer.com/materials/coatings/



however Korolon treatment is also interesting
http://miti.cc/portfolio/low-friction ... perature-foil-bearings-2/

Korolon® High Temperature Coatings

http://miti.cc/products/korolon-coatings/
Mohawk Innovative Technology, Inc. (MiTi) has developed the Korolon® high temperature coatings designed for applications requiring low friction, wear resistance, low thermal conductivity, and thermal and oxidation protection. These coatings have been specifically developed and evaluated for a wide temperature range from room temperature to 2,400oF (1,315 oC).

The Korolon® coatings have been successfully used as solid film lubricants in high-speed and high-temperature rotating machinery while maintaining a low coefficient of friction and excellent wear resistance.
The high temperature Korolon® coatings have been successfully evaluated as thermal and environmental barrier coatings (TBC/EBC) on static and rotating components requiring protection from harsh environments, such as in ramjet and gas turbine engines.

Applications of Korolon® coatings:

Oil-free, high speed foil bearings
Oil-free, high speed foil seals
Foil bearings in gas turbines
TBC/EBC in ramjet simulator
High speed micromachining spindle
Oil-free, high speed air compressor
Foil bearings in turboalternator/generator
Foil bearings in fule cell compressor
Foil bearings and seals in hydrogen compressor

The Korolon® series includes both polymer-based and ceramic-based coatings. Extensive research and development have lead to refined processing methods to ensure a practical and cost-effective deposition method for coating metallic and ceramic substrates. Extensive durability testing has included high speed friction testing using journal and thrust foil bearings, adhesion testing using standard methods of bend testing, pull-testing and indentation testing; thermal stability and conductivity testing using conductive and convective heat methods; and full scale application simulation testing both in the laboratory and in the field.

I want to find where to get the ceramic bearing surfaces. I know you can get 75,000 RPM ceramic bearings for relative inexpensive prices.

This would be so fun to make a concept model then move to a full on 4 cylinder head.

here is the same concept only spheres.

https://www.youtube.com/watch?v=vjHkAgi9TbY