High Compression ?
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ok 12.1 compression keep the motor cool... get bigger injectors to compesate for the incresed cylinder pressures. stock honda ignition is more than good to spark the fuel in the combustion chamber. and get forged pistons...dont make the pct(ctr) super high compression mod the honda piston ring lands have the better possibility to crack and leave you with bad pistons scored cylinder walls and rings floating around in the block.
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then tell me why people with non rollerwave pistons will detonate then swap in rollerwave pistons with same compression ratio and not detonate. Pistons get as much carbon build up as the heads combustion chamber. Cabon build up filling in hte pits does not help prevent detonation much it doesnt have enough of an insulating property to keep the pits from heating up therefore causing hotspots same thing appl
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If your not planning on going all out dont even bother with anything above 11.5:1. Only go up to 12:1 if you are planning on running some toda b/c or Jun 3 cams. IMO
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Don't bother giving me "rep", I won't return it and I think it is stupid.
Gracie Barra Clearwater
Gyms in Clearwater, St. Pete and Port Richeypm me if you are interested in trying a free class at any of the gyms.
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Originally posted by "Someone"
Originally posted by Robster
then tell me why people with non rollerwave pistons will detonate then swap in rollerwave pistons with same compression ratio and not detonate. Pistons get as much carbon build up as the heads combustion chamber. Cabon build up filling in hte pits does not help prevent detonation much it doesnt have enough of an insulating property to keep the pits from heating up therefore causing hotspots same thing appl
Originally posted by Robster
then tell me why people with non rollerwave pistons will detonate then swap in rollerwave pistons with same compression ratio and not detonate. Pistons get as much carbon build up as the heads combustion chamber. Cabon build up filling in hte pits does not help prevent detonation much it doesnt have enough of an insulating property to keep the pits from heating up therefore causing hotspots same thing appl
As for the carbon deposit who ever said anything about insulation properties? It fills in any small irregularities and helps in conducting heat away from an area. Hell though even without carbon deposits like I said above no single part of the bowl is going to heat up enough to ignite the mixture unless there is some HEAVY gouging resulting in some nasty surface irregularities. If any spot begins to heat up it will dissipate heat to the surrounding area rather than allow the heat to build up in a specific area and detonate the mixture.
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Originally posted by "Someone"
. If any spot begins to heat up it will dissipate heat to the surrounding area rather than allow the heat to build up in a specific area and detonate the mixture.
. If any spot begins to heat up it will dissipate heat to the surrounding area rather than allow the heat to build up in a specific area and detonate the mixture.
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Originally posted by "Someone"
Originally posted by Robster
and a smoother surface does this much better no one particular place for heat to build up. However before that one place gets to disipate heat more heat is introduced into the equation on the very next compression stroke. As far as insulating properties of carbon goes if it had the same insulating properties as the aluminum then yes carbon could build up in the pits causing smoothness and more even dissipation of heat however because it doesnt have any insulating properties the heat goes right through it causing hot spots in the surface of the metal. Its the same concept why the rollerwaves are so damn smooth and why the edges of the valve reliefs are rounded.
Originally posted by Robster
Originally Posted by Someone
. If any spot begins to heat up it will dissipate heat to the surrounding area rather than allow the heat to build up in a specific area and detonate the mixture.
The carbon deposits form a bridge between the minute surface irregularities allowing better heat transfer. And aluminum has very poor heat retention hence the reason its used for heat sinks and not for cook ware (ie: cast iron skillets); And like I said before without them (carbon deposits) it doesnt matter because aluminum dissipates heat well enough for there to not be a heat buildup since the bowls are relatively smooth. The concept behind the roller waves is a change in floor shape AND a reduction of sharp edges which will heat up quickly. There are no sharp edges on the bowl only on the perimeter of the bowl like I stated initially which could be a problem for B20 engines (81mm chamber vs. 84mm bore).
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so why did endyn make hte rollerwave as smooth as they did? What causes detonation a lean condition and a hot spot. If what you say is true then why doesnt everybody run 13:1 and 14:1 compression when all you would need would be a much colder plug and fuel??? So what is hte purpose of polishing the combustion chambers on high hp/race motors?
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Posts: (452) posted - Thursday March 28th 2002 12:29 pm
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If your not planning on going all out dont even bother with anything above 11.5:1. Only go up to 12:1 if you are planning on running some toda b/c or Jun 3 cams. IMO
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yes do what kj says and hope to god that the vavle doesnt touch. which he for got to tell u about becouse he doesnt know if your gona run those cams your prolby going to have to use their pistions with buttetfly cuts for vavle over lash
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Originally posted by "Someone"
Originally posted by Boosted Z31
who in the hell cares
build your motor to handle it.
Originally posted by Boosted Z31
who in the hell cares
build your motor to handle it.
