VietRacingGuy

ok, i found out that LS1 has only 16 valves, which is 2 valves per cylinder, 1 intake and 1 exhaust. and single cam!!!
most other import car, (europe and japan, even korea) has twin cam and 4 valves per cylinder, 2 intake and 2 exhaust valves.
i wonder if GMC make an LS1 with 4 valves per cylinder and with twin cam. how much power can LS1 gain from this.
LS1 is a mono-timing, unlike other engine with variable timing, has only 6 to 7000 rpm. while some imports engine (europe, japan) has up to 9000 rpm.
well, this just my ideas for LS1 engines, mustang cobra has 32 valves in their engine. just tell me what you think, even if you dont like this. thanks.

Big Stick

Oh, Geez! Let the flames begin...

1BADFNZ

Umm??? wow someone wanna take this one???

Miles in MI

Most other sports cars also have less power, peakier torque curves, worse gas mileage, and weigh more than the Corvette with the LS1. Check out the power output, curb weight, and gas mileage of the Porsche 911, Acura NSX, Nissan 350Z, Ford Mustang Coba, etc. They does not compare favorably. DOHC engines are taller, wider, and heavier than OHV engines. Things like turbos and superchargers add size and weight, too.

Instead of looking at valves/cylinder, try to find an engine with more power, smaller external dimensions, lower weight, that's easier to work on and has better gas mileage, than an LS1. That's the criteria you should look at.

jrp

iTrader: (16)

:umm:

i'll leave this one alone. i dont know whats worse though, this question or the fact that you just found out that your ls1 was OHV.

lets just throw in the hp/l agruement while were at it

i love my ls1 and i love my mk1 mr2, two totally different setups yet they both put a smile on my face

White_Hawk

iTrader: (3)

I got a good one: How much horsepower does that 32 valve Ford engine make? I'll tell you - less than an LS1 and way less than an LS6. Also, the new 5.7 Liter Dodge Hemi makes the same as an LS1 (and less than an LS6).

So you can have your high tech stuff, I'll take my low tech pushrod V8 and beat you every time! The other companies don't have the expertise that GM has when designing engines, so they have to make up for it with gimmicks, that's all I'm saying.

-Geoff

KHShapiro

iTrader: (10)

my understanding is the new Z07 will be a 32valve, not to be confused with the C6 LS2 which will still be a 16 valve.. Also they are working on electric Valve Timing Like in the new BMW's..

KHShapiro

iTrader: (10)

fixed my post

BoneStock

All these 4-valve motors seem to have a problem keeping up with my 2-valve OHV. Selling my DOHC cobra was the best thing I ever did

1BADFNZ

I'm wondering if he is really this much of a dumbass or if he's just trolling????

Eric L

Wow... I read this?

Colonel

"my understanding is the new Z07 will be a 32valve"

I SERIOUSLY doubt this.

Spinning an engine to 9000 doesn't require 4 valves but it is made FAR easier by having a very short stroke and small (lightweight) pistons...as in, having a tiny engine (man do those RC airplane engines spin up!) Making 9000 RPMs with 350-400ci is also doable but not-so reliable due to the inertial forces involved in the heavy components and the distances (long stroke) they travel. But, this is the price we pay to have larger CIs and thus superior TQ and HP.

I don't see 4 valves per cylinder or OHV as being high tech (stuff has been around for many decades)...only unnecessary and somewhat ineffective in streetable applications.

Damian

iTrader: (89)

OHC, DOHC, etc....Was made for efficiency, reliability, and gas mileage. Not raw power..

Gimme my 2v per cylinder and pushrods any day of the week.....

Colonel

Efficiency and gas mileage...I haven't seen anything that impresses me more in those departments than an M6 C5. Sure, there are imports that get better MPG but do their power and performance specs match the C5s? None that I've seen.

Damian

iTrader: (89)

There are some out there, but not many that can compare to the efficiency of a C5....

Good point Colonel...As I said, gimme my pushrods any day of the week...

gojo

iTrader: (12)

I think they are developing a 24 valve engine.

Didn't the ZR1 have 32 valves?

Excal

lt5, nice rare engine.

blacktransam

iTrader: (13)

i'm gunna push those rods till the day i die

WhiteDiamond

First off, why do people always assume push-rods are low tech? They are actually newer tech than OVC motors.

As for the argument, you have some pretty good replies all ready. GM can and has accomplished the power and performance with a compact, low mass package that can take on the world's best in the Z06 chassis. Torque should be the word you look at(street application) and GM's LSx series of motors produce torque over broad ranges that ALL of the high RPM monsters you are thinking about envy.

Todd

BlackNite383

Yeah, the LT5 had 32 valves, but the LT1 was out at the same time and made better low end torque than the LT5. The Cobra engine is another good example that the bigger intake runners in a small motor doesn't build quality low end power. Ford knew the only way to fill those intake runners faster was to use a blower. It works, but it's a band aid fix for a bad design in the first place. And the bigger the runner gets the slower the air speed becomes which delays the power curve. I hope if GM makes a major engine change that it's only a OHC motor with a single intake valve but maybe use 2 small exhaust vales. This way we still get the higher velocity on the intake side, but get alittle better scavenging on the exhaust side. But man...God Bless the GM LS motors