Next the throat of the intake port is roughed out.


Then the inlet is enlarged.

An engine's cylinder head is the heart of its power potential.  For an engine to make more power, the ports have to flow more and the combustion chamber should contribute to a good efficient burn.  The first thing we wanted to do is to up the engine's compression ratio.  The highest compression ratio that anyone we had heard of using was in the low 12’s, in fact the most well known GET engine guru on the Ruckus forums declared that it was not possible to run higher compression without detonation.  We didn’t think this was true with the low propensity to detonate stock shallow combustion chamber and tiny bore so we set out to design our build to run a 13.2:1 compression ratio, something we felt would still run on 91 octane gas.  We did make a bunch of anti detonation modifications to our combustion chamber to err on the side of caution.

The exhaust port is treated in the same manor.

To do our headwork, we sought out Dan Paramore of DPR racing.  We have known Dan for many years and we knew he would help us with some of our innovative ideas.  The first thing would be to make our combustion chamber less prone to detonate.  The stock GET head has an open chamber.  What we wanted to do was to turn this into a more turbulent burning quench type combustion chamber.  A quench chamber has areas, usually away from the spark plug that come close to the crown of the piston.  The mixture in these parts of the chamber squirts out as the piston comes up to TDC creating a turbulent and a more homogeneous mixture that will burn more efficiently and is much less likely to detonate.

The combustion chamber and ports are finished with sanding rolls or cartridge rolls.  These give the chamber and ports their near polished finish.


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Tuesday, November 03, 2009 2:59 AM
Ah, the interesting part of the project. Good stuff.

PS: Nice work, Dan!
Tuesday, November 03, 2009 3:05 AM
I was under the impression that sighn grooves used to be cut to promote flame travel on the old hemi head engines where ther was no direct travel over the baseball looking pistons. Used this way it seems more a tumble generator.
Tuesday, November 03, 2009 3:40 AM
Can we get a rough tally of the money spent on these project vehicles?
Tuesday, November 03, 2009 3:51 AM
i dont want to know...just like i dont want to know what ive spent on my own car.
Wednesday, November 04, 2009 8:38 AM
Are there any empirical data on the Singh grooves?
Wednesday, November 04, 2009 2:19 PM
When I saw this tiny cam.....I just couldn't stop laughing.....haha, so cute....haha
Sunday, April 10, 2011 10:16 AM
Cant Wait For More
Friday, September 23, 2011 11:51 PM
First off good stuff, theroy: convert in to PGM-Fi fuel delivery system possibly like the one in the EURO Zoomer, would we be able to adjust fuel delivery timing, and if so also adjust ignition timing electronicly. Would we be one step closer to having V-tec mopeds?
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