Engine2008

toc

=Parts=

Piston kits: http://www.tkrj.co.jp/product/m-piston-kit.html

=Tuning=

If you want to help with tuning, please read the megasquirt manual

http://www.msextra.com/manuals/MS_Extra_Manual_Index.htm

Further Documentation

 * [|Pinout of the O2 sensor interface]

=Reducing Displacement=

The basic idea is to reduce the bore (sleeve) and reduce the stroke (destroke) in order to have an effectively smaller engine. Smaller engines consume less gas, therefore we will consume less gas with a smaller engine.

Problems

 * Crank is counterweighted
 * Flywheel may not be the right weight (probably have to reduce the weight)
 * a new custom head must be made
 * Compression may be off

=ECU control of spark timing=

The ECU with the upgraded firmware can control spark as well as fuel injection. There are additional circuits that need to be built to utilize this:


 * Ignition coil trigger using VB921 or some other IGBT
 * 4-1 wheel decoder for timing (we need to add 3 magnets to the flywheel in addition to the one on there already)

=ECU=


 * **5V reference** on pin 8 of JP1

Real-time variables
The serial interface supports printing of real time variables. Send "A" over serial and you get about 20 bytes back. According to the megaview source, this is the format


 * 0||Counter||
 * 1||?||
 * 2||Status||
 * 3||MAP||
 * 4||Barometer||
 * 5||Ambient||
 * 6||Coolant||
 * 7||TPS||
 * 8||Battery||
 * 9||EGO||
 * 10||EGO||
 * 11||Air||
 * 12||Warmup||
 * 13||RPM||
 * 14||Pulse||
 * 15||TPSACC||
 * 16||Barometer||
 * 17||Gamma||
 * 18||VE Corr||

Wiring Pin-out


=Suggestions=

Other teams
[|Description of Cal's engine]

UBC06 used a Honda piston and rod.

Joe

 * 1) We should sleeve the cylinder to a size smaller than 50cc, i was thinking 47or 48cc. This can be achieved by only reducing the size of the Bore, i spec it out its 37.098 mm for the bore. This gives us 48 cc. The Stroke and connecting rod can remain the same.
 * 2) The Crank counterweight can be lighted to account for the changes in the weight of the piston.
 * 3) For the Head i was thinking a little more complex this year, Single Overhead Cam (SOHC). I did a little research and to make life easier for us we can modify a cylinder head from a Honda C50 or C70 (C50 is 50cc and C70 is 70cc). The head is relatively cheap compared to a custom machined head, <$60. Performance Cam can also be purchased for $30.
 * 4) Fly wheel could be made a little heavier cause we want allow the engine to run at very low RPM's i was thinking around 600 for idle and maybe 1800 for power.
 * 5) Spark Plugs, there are these Pulstar Spark Plugs that claims that it will improve fuel effieciency by a good factor it is relatively new technoloy http://www.pulstarplug.com/howtheywork.html
 * 6)  In Le Mans Racing the Audi R10 (diesel) uses [|Direct Fuel Injection], meaning fuel is directly injected into the engine. Thus we can 99.99% control the fuel going into the engine and absolutly make sure there is no fuel being wasted. however it requires high pressure fuel system. We can use diesel fuel injectors, DFI have been used in diesel engines for a while now.