Engines

[DKXNYII25]

what kind of engines are best u guys think...DOHC OHV SOHC....base on performence and durlibility....which one would last longest

[matt11583]

dohc

[drdisque]

all things being equal, OHV is the best for reliability because it has the least moving parts

Most high performance street car engines tend to be DOHC, but there's inherent advantages and disadvantages to each.

[public]

Originally Posted by drdisque

all things being equal, OHV is the best for reliability because it has the least moving parts

Most high performance street car engines tend to be DOHC, but there's inherent advantages and disadvantages to each.

OHV??? does anyone still make a flathead? ALL new engines are Over Head Valve (OHV) -some have Dual Over Head Cams (DOHC) as well. Some are Single Over Head Cam (SOHC)

Pushrod engines have many more parts and are still OHV

An Over Head Cam Flathead would be very interesting.

I love them all.....

[nissanfanatic]

DOHC bucket style lifter.

[sierrap615]

horsepower = DOHC
torque = SOHC

[Kurtdg19]

Performance and durability in either of these engines are pretty much up for grabs. Performance depends on how their tuned. Durability will most certainly reflect how their driven. They all have their advantages/disadvantages.

DOHC can offer good hp/Liter, but you pay the premium in parts, and overall dimensions.

SOHC could be said to be inbetween. Lesser parts keep the cost lower, and overal dimensions a bit smaller.

OHV (pushrod) its a bit trickier to tune (control of valves). They make it up for its efficiency in space, and cost (especially in a V engine).

[Reed]

there was a thread about the advantages and disadvantages of each of these a while ago so if you are interested you could try to do a search and find it, i dont feel like it right now.

[Musashi3000GT]

hmmm, no body mentioned the rotary! its another type of engine. I'd go with a DOHC. if you are performance driven you really cant worry about maintanance and prices. just pay to play.

[calgary_redneck]

There have been some very reliable engines of each and there have been some of more questionable reliablity of each. There are far to many factors to make a general statement.

[sracing]

Originally Posted by DKXNYII25

what kind of engines are best u guys think...DOHC OHV SOHC....base on performence and durlibility....which one would last longest

Assumably you mean "best" in performance? If so, all other things being equal, the DOHC is far superior.

Jim
SR Racing

[CBFryman]

ya, rotary doesnt use cams or moving valves. they rotar piston acts like a valve (same as 2 cycle engines) and there are less moving parts and nothing has to change direction in a rotary. If taken care of properly (roaries are very diference from other ottocycle engines as far as design and mentanience go) rotaries will last much longer and it is possible to build Mazda's litlls 13B up to well over 600hp. and that 600+ hp is a whole lot more reliable than if you where to build up a normal 1.3l piston engine up to 600+ hp. however. the only flat heads still being used today are in lawn mowers. and even some lawn mowers have OHV and OHC. DOHC is best performance wise and they are about the same on a reliablity stance compared to SOHC. there is also QOHC (quad over head cams) for V engines with 4 valves per cylender.

[public]

I think the last car without over head valve was the East German Trambit-but I have never been under the hood of one so I could be off base. I am not even sure of the spelling.
I do know they were 2-cycle/2-cylinder.

[sracing]

Originally Posted by public

I think the last car without over head valve was the East German Trambit-but I have never been under the hood of one so I could be off base. I am not even sure of the spelling.
I do know they were 2-cycle/2-cylinder.

Trabant. And yep since it was a 2cycle it wasn't an overhead valve.

Jim
SR

[TeamFL1]

what about the W engines? r they goood?