Grooved heads
Turbo Mini Forums

I'm curious to know if anyone has ever tried this on an A-series cylinder head:

http://www.somender-singh.com/

This seems to make sense somewhat but I wonder how much improvement you can actually get.

Jean

http://www.jbperf.com/

Not sure what I think about that idea, mateys article doesn't seem to make that much sense. His dyno testing involves taking a stock engine and upping the CR anyway, hooray, massive improvement. Looking at the pictures of the grooves, it seems that some are on the side of the plug and some aren't, hardly consistent. I'm sure the guy has done loads of research and is right but I can't really see any reason why a groove would increase laminar combustion speed! Use a different chamber shape and lower octane! It seems that matey is trying to increase turbulence which isn't really about multiple flame fronts, the velocity of the flame is massive compared to the odd bit of gas moving around this way and that. It may work if his fuel isn't in suspension enough or is separating, but that would be the manifold grooves anyway and yes, it would be more effective at low velocities. Would probably create a thicker low velocity film though buggering up higher speeds. Harry Weslake had the right idea and I think his heads were possibly more influential that some of the old war stuff running massive loadings of fuel and huge amounts of TEL. If this stuff does work, IF he is poaching old RAF technology, it is flawed as the snag with the ultra high boosts was that you needed ultra high octane, the mixture was so dense, it separated and so you needed a chamber to maximise combustion speed (as lower octane=higher flame speed) this holds true for gigantic combustion chambers of an aircraft (which with a high CR are almost flat). I personally think that his idea is bollocks.

Running a FI A series, you're looking at perhaps having problems of fuel starting to dropletise, allthough the combustion chamber is inherantly designed for high burn speeds. (not sure how, but have it in a book somewhere) It would be interesting to see how your massive dished pistons and huge de-beaked chambers alter that from ideal. I reckon that the grooves would fill up with shit and then glow causing detonation anyway. Simple solution, leave Harry's chamber as it is and add loads of TEL, job done.

Just my thoughts. Stu

Bugger off, I'm getting there.

"[using] Mr. Singh's invention, the yearly national fuel savings
would equal the amount of oil America imports from the Persian Gulf."

COMPLEAT ......BS....LOL

LMFAO pete