Engines

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

dohc

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.

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.....

DOHC bucket style lifter.

horsepower = DOHC
torque = SOHC

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).

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.

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.

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.

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

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.

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. :slap:
I do know they were 2-cycle/2-cylinder.

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. :slap:
I do know they were 2-cycle/2-cylinder.

Trabant. And yep since it was a 2cycle it wasn't an overhead valve. :cwm27:

Jim
SR

what about the W engines? r they goood?

the VW W8 and W12 are just DOHC 8 and 12 cylinders with 4 banks of cylinders

Trabant. And yep since it was a 2cycle it wasn't an overhead valve. :cwm27:

Jim
SR

Thanks for the correct spelling. I would like to get into one even though I hear they are junk and not legal in the US (emissions,crash worthyness,etc..). I just like to see something different.

Isnt the Buggati (sp?) Atlantic going to have a W 16? and quad turbo? i think its only 2 cams as well.

yeah the bugatti EB16.4 (veyron) is a W16 quad turbo through a dual clutch sequential seven speed tranny and audi AWD system i think. i think it has four valves. if you go to the bugatti web site they have a really good 360 degree translucent walk around thing of the engine.

yeah thats a hell of a car. they have an artical on it on HOWSTUFFWORKS.com

what about HYBIRD engines. I found out that engine damage is usally when you turn on the car, city driving and hardcore that we all love. HYBIRD engines... the electric does most of the work in the cities so does that help the engine life? because i know for a fact that going 60mph is very health for your car.. like a run in the park.

what about HYBIRD engines. I found out that engine damage is usally when you turn on the car, city driving and hardcore that we all love. HYBIRD engines... the electric does most of the work in the cities so does that help the engine life? because i know for a fact that going 60mph is very health for your car.. like a run in the park.


This raises some interesting questions. Also the gas engine in the hybrid may see more starts than a normal engine, perhaps several in a single trip. How will this affect engine life?

Hybrid cars are expensive, the battery soon dies, and i don't know how much is to replace or recharge, which means more care, and that means $$$$

the batteries are constantly recharged by the car. The Honda Insight's batteries are warranteed for 3 years, replacement should run less than $500 once they get too old to hold a charge.

i think its more than 500

the VW W8 and W12 are just DOHC 8 and 12 cylinders with 4 banks of cylinders
Could you get a quad-turbo for it then? Imagine a Phaeton at like 1000hp...Drool....

The phaeton, what a horable endevor that was. Great car, but who is willing to spend 80 grand on a car with a VW on it. Don't get me wrong, VW is great and the Phaeton is a great car, but the return on the investment (have you seen the factory they built for it?) cut volkeswagons profits in half last year. If they had put an audi badge on it, that might have been a different story.

As far as cam and valve configurations, blah, it all depends on what your doing. You wouldn't try to power a tank with a b16 and vice verse, unless you're just that crazy.

I was just reading the New BMW Inline 6 for the 3 series, its the lightest 6 cylinder engine ever, BWM announced. and it makes 258 hp and 221 torgue. most of the engine is made of Aluminum magnesium, light weight martials. I think this is an great engine

i think its more than 500

try closer to $5000, or maybe thats the prius