4.0 SOHC
#1
4.0 SOHC
could someone explain to me how our engines work as far as bing SOHC and waht the advantages are of the SOHC....
i think some 4.0s have the OHV (i think that what its called), what is the difference in this and the SOHC?
sorry guys, id just like to know a little more about my engine, my first Ranger v6....
my 94' had the 2.3, but idk if it was DOHC, SOHC, or OHV
i think some 4.0s have the OHV (i think that what its called), what is the difference in this and the SOHC?
sorry guys, id just like to know a little more about my engine, my first Ranger v6....
my 94' had the 2.3, but idk if it was DOHC, SOHC, or OHV
#2
OHV engines have the cam in the block and actuate the vales with lifters and pushrods. The cam is turned with a single short timing chain. The SOHC engine has a cam in each head which actuates the valves directly. Its more efficient overhead cams but Ford made it way to complicated. The SOHC 4.0 engine have 3 timing chains, 2 on the front of the engine and 1 on the back. The one on the back is spun by a jackshaft which looks like a cam but it has no lobes and it is in the same location where the cam would be in a pushrod engine.
http://auto.howstuffworks.com/camshaft1.htm
http://auto.howstuffworks.com/camshaft1.htm
Last edited by whippersnapper02; 06-11-2009 at 11:50 AM.
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#11
Basically with a OHC engine there is less stuff to soak up power. A pushrod engine has pushrods and lifters to move around along with everything else while the OHC engine doesn't. Less weight in the valvetrain translates to more power at the crank.
#12
downside of the sohc at least in my experience, is there's no torque! but plenty of power on the top end. but with a pushrod engine, you get lots of torque down low. but im sure the supercharger on my grand prix had something to do with that. but damn, those motors are easy to work on. i dont even want to see the 4.0 in my truck
#14
your 2.3 ranger was a OHC
meaning the cam was directly opening the valves on top of the head in time with the crankshaft by the use of a timing belt
your 4.0 SOHC uses the same idea...
the cam is on top of the heads and are timed to the crank with a timing chain
the OHV engines are the same as the classic small block engines with the cam in the middles of the block, the camshaft is still turned using a timing chain in sync with the crank and the cam uses pushrods and rockers to open the valves on top of the heads
meaning the cam was directly opening the valves on top of the head in time with the crankshaft by the use of a timing belt
your 4.0 SOHC uses the same idea...
the cam is on top of the heads and are timed to the crank with a timing chain
the OHV engines are the same as the classic small block engines with the cam in the middles of the block, the camshaft is still turned using a timing chain in sync with the crank and the cam uses pushrods and rockers to open the valves on top of the heads
#15
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the SOHC will make more torque than the OHV ins stock form but you have to get the RPMs up. This is where a manual might really take advantage of the SOHC.
The timing chain issue was fixed in 03, the rattle is here or there in engines. my 03 does not have it. if you had the timing chain issue you would know it.
The timing chain issue was fixed in 03, the rattle is here or there in engines. my 03 does not have it. if you had the timing chain issue you would know it.
#19
One of the main advantages of the SOHC engine, besides not having all the valve train extra weight to move around, is it also does not have the push rods coming up through the heads. This leaves much more room to design better intake and exhaust ports. This results in a better breathing engine. That is why they produce so much better top end power. Unfortunately, the long chains are one of the main disadvantages in reliability.
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