Results 11 to 15 of 15
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November 13th, 2008 05:44 AM #11
advantage ng CR-V gen3 to gen2 fuel efficient lang? gen2-dohc gen3-sohc engine.
when overtaking need pa ng gen2 ng mid to high rpm para maovertake yung gen3?
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February 15th, 2010 12:22 PM #12
2.0 SOHC vs 1.5 DOHC Variable Valve Timing engine on a short sprint?
Marami akong kilala, ang sabi matulin talaga ang vios so tumatak sa isip ko itong bagay na ito hehe. One time, may nakatapat ako sa stoplight, gold Vios 1.5, ready to race so I gave it a shot kung ano ba ang ibubuga ng stock 1.5 DOHC VVT vs 2.0 SOHC. (Advie vs. Vios) (Paalala, street racing is dangerous and prohibited) Stoplight to stoplight lang kami so short burst sprint lang ang nangyari. To make the long story short, inungusan ko lang ang loko hehe, nasa 90km/hr na ako nung nag-brakes ako.
Dati kasi, ang pagkakaalam ko basta DOHC at VVT, eh tatalunin ka talaga sa heads on sprint pero hindi ganoon ang nangyari. I don't know baka dahil mas malaki ang displacement ng engine nung SOHC kaya baka nanalo. Baka kako pinagbigyan lang ako (but this happened 4 times pa and same result), so nagresearch na ako regarding SOHC vs. DOHC.
http://paultan.org/2005/06/22/sohc-vs-dohc-valvetrains/
"So to sum it all up, SOHC has better low-end power, DOHC has better high-end power and overall maximum power. 4 valves per cylinder is much better than 2 valves per cylinder and it doesn’t matter whether 4-valves is achieved via SOHC or DOHC."
After reading from this site, now I know bakit nanalo ako. Kung nasa highway kami, tatalunin niya ako kapag nasa 100km/hr na dahil mas nagpro-produce na nang mas more power ang DOHC kontra SOHC hehe. Sorry, short sprint lang mga nakalaban ko hehe.
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February 15th, 2010 01:48 PM #13
If you don't modify your engines SOHC vs. DOHC doesn't matter.
Like Niky mentioned, the R18A1 1.8L engine in the FD1 Civic is a SOHC four-banger with four valves per cylinder, hence a 16-valve design. Yet Honda managed to bang out an even 140 HP at the crankshaft from what is supposed to be a second-fiddle engine to its DOHC big brother, the K20A/K20Z 2.0L engine - with none-too-shabby torque delivery too. In non-Type R applications, as in the FD2 Civic and RE5 CR-V, the K20 is good for just 155 HP at the crank.
This just goes to show that for most purposes, the number of camshafts doesn't really matter. Such is the state of engine technology today.
Now if you were to go racing the normally-aspirated way...a twin-cam cylinder head would certainly help as an engine tuner could more effectively control the "breathing" of the engine. Having a dedicated camshaft each for intake and exhaust makes it easier to tune, in practice. For 90% of us however, the number of camshafts is a moot point.
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February 15th, 2010 01:58 PM #14
Double post, laggy forum
Last edited by Type 100; February 15th, 2010 at 02:13 PM.
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February 15th, 2010 02:11 PM #15
Triple post, laggy forum
Last edited by Type 100; February 15th, 2010 at 02:13 PM.
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