Rather than invade Tim's thread i thought i'd post this here.
Can somebody who has greater knowledge of DOHC assemblies explain the difference and pros/cons of each different type?
We all know that DOHC means double-over-head-cam, but there seems to be many variations of how the cam transmits its movement to the valve.
For example, the m42 uses bucket lifters whereas the m44 uses roller rockers.
There seems to be a consensus here that the bucket lifter type is superior to a roller rocker type assembly, however honda motors uses a roller rocker system and can produce some of the highest 4 cylinder power plants in the world.
Can somebody explain these please?
Not just for me, but maybe as a reference for other people who are trying to wade their way through a world shim under buckets or rocker ratios.
My knowledge of engine tuning is pretty good for the most part, but the whole upper assembly is where im currently trying to focus my studying.
I know about coil bind, seat pressures, open pressures, valve lift, valve float, spring rates, the reason for using shims, diff. between hydraulic and solid lifters etc and all that jazz but i would just like to know more.
If you dont feel bothered explaining, but know a good link to a website or article then please, by all means, fire it up:D:D
Topic: DOHC variations (Read 2123 times)