Toymods Car Club Inc: Tech & Conversions => Why is a twinky better than a single cam

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GIN51E
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July 2002

Re: Why is a twinky better than a single cam	Wed, 07 May 2003 12:30

SOHC= Single Over Head Cam DOHC= Double Over Head Cam, friction has no part in why DOHC is better then SOHC, come on guys tell me how much friction there is? crap all, if your so worried about the extra "friction" of a SOHC then why don't you also think of all that extra mass of a DOHC that has to be turned around by the engine still having the same friction if not a DOHC would have more friction, DOHC isn't exactly "BETTER" than a SOHC its just a DOHC is easier to adjust the exhaust valves and intake valves for best performance, so rather then having to re-ground a new cam every time you just adjust the angle of one of the two cams to obtain best performance, but thats just an easier way to do it you can still get the same performance from a SOHC it just requires more money and time in development, The main reason a DOHC is better then a SOHC is the fact that DOHC are usually cross flow heads "where intake is on one side and exhaust on the other" where SOHC were usually both on the same side like an 18-RC vs a 18-RG "for the celica guys to understand" also DOHC tend to ev higher then a SOHC, the DOHC can rev higher and longer then a SOHC DOHC isn't better or worse then a SOHC its just all depends in the complete design of the engine but a general rule is that DOHC is a cross flow head and can rev higher "usually due to more precise valve timing" so if you want an engine so you can play around with valve timing ect get a DOHC, or if your looking at getting an old style engine "for example carby" get a DOHC, but these days SOHC doesn't have a huge diff over a DOHC, its just having two cams in there is a cheaper and easier way of fine tuning the engine. like if you take an 18rc and rg engine and put lumpier aftermarket cams in you will get a bigger hp increase in the rc "SOHC" because the new cam has been tested and grinded to have to best valve timing where the RG "DOHC" already has spot on valve timing. why? because it was easier to tune the valve timing on a DOHC cam then a SOHC, my car is a SOHC it has a cross flow head and loves reving high and can sit at 8,500rpm all day long with no problem, so yeah any of that make sense? i'm not very good at explaining things i understand something but i'm not very good at explaining it to someone else, but old engines as a general rule DOHC is better modern engines there isn't much difference between DOHC and SOHC anyone want to argue my point? also lower octane fuel is more explosive then high octane, just high octane is more stable "doesn't pre ignite" there for you can advance the ignition timing more which increases power. also peak power doesn't = economy, in theory yes it should be right but we don't live in a perfect world, just look out our engine more then 50% of the energy is lost as heat!!!! usually with a standard car you can increase power and increase economy but when your foot is into it then economy is out of the window, only time peak power and economy can be obtained is at one set cruiseing speed, not when moving up and down through the rev range, if you tune your car for the most power possible then look at your fuel consumption as it will go straight out the window, look at a pure bred race car thats only used for racing on the track, it chews through the fuel like nothing else and also wasts alot and spit it out the back, you think the flames coming out of the V8 supercars is a sign of good economy? NOPE but they sure are tuned for peak power. [Report message to a moderator]

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