Re: Can a drop in air intake temperature ( 60 - 50°C ) cut exhaust noise ?


"TE Chea" <4ws@xxxxxxxxx> wrote in message news:473ff3c6_1@xxxxxxxxxxxxxxxxx
| A drop in charge temperature, I would think, should
| increase exhaust noise
I've just realised that a cooler air intake ( has more oxygen )
enables a faster combustion ( oxidation of fuel ),

That's wrong. Cooler air is denser and has more oxygen which allows more
fuel to be added. The additional fuel creates more power.




this explains
why noise dropped 5% ( when cold ) - 15% ( when hot ). I
thought physics alone can explain this drop, I did not realise
that this drop involves chemistry.

| More spark will NOT produce more power.
You're wrong, bigger sparks ignite more air-fuel § mixture, so
more § can burn before


No, your wrong. A spark either ignites the air/fuel mixture or it doesn't. A
hotter spark won't make it ignite any quicker. Don't believe most of the
bull*** advertising you read.



[i] pistons reach their bottom, so
produce more torque : combustion after this point ( B-D-C ) is
worse than useless ; pistons cannot move down any further,
produce only noise + heat + CO² + CO + NOx
[ii] exhaust valves open, so reduce noise caused by combustion
after exhaust valves open ( during pistons' exhaust stroke ).

| you DO get a substantial amount of noise from the intake
Any such noise must be high pitched, this engine's exhaust
noise is low pitched.








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