Quote:
Originally Posted by deanznz
Thanks Logic, I only just cottoned onto that Ben Alameda Racing guy but hadn't seen the squish grove before..... real interesting.
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Ye, I see it kinda as a 'culvert' that softens the local super high pressure/vacuum in squish AND gives you directional control!
It's a b!tch to do though:
I used the old gasket as a template so as to not go outside the lines.
Problem is the file cant get into the gasket top to chamber corner.
The groove ends too soon, too far from the circle for the angle I wanted.
I filed down into the gasket edge, carefully, ALWAYS leaving an untouched gap of ~1.5mm IIRC.
Groove was around 2.5mm wide at its widest.
Rounded the edges of the groove with sandpaper after. (younger eyes
)
I put the groove exit where the squish's distance to the plug was at minimum Between the valves normally. Wherever squish is closest to the plug.
My grooves didn't point directly at the plug as I figured a ~D10 mm vortex around that initial flame front would be clever!
I'll never know..?
It was that 2L Mazda/Mitsubishi engine everyone wants.
Head skimmed after the grooving.
My feeling was that it had more low down oomph and ran out of omph a bit later.
But I'd swatted it up (the wazoo) already, so maybe it was all placebo!?
Soz pgfpro.
A bit OT, but probably relevant..?
Better scavenging; lower temps, more charge and all that..?
Only one way to know!
Today
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