While we are talking V8s

Saw a IS-F at the lexus dealership when dropping off my sisters IS300 a month or so ago, and it was in there with the engine disassembled, it had blown up.


Does this mean that the engine used in the IS-F is to be avoided at all costs ?


After all one guy apparently has managed to blow one up....

 

Lol this is getting out if hand.

Are you comparing the lsx to the viper motor? I'm confused.
There really isn't enough info in what you were saying.

 

you clearly dont know a whole lot about me if you think your going to make me look retarded when talking V8's. I can talk about them all day, what do you wanna know, flatheads, rocket motors, nailheads, Caddie BB's, poncho BB's, Y-blocks, FE Motors, 427 SOCH's, SBC V1-V5, MOD motors? how about mechanical fuel injection, or alcohol motors?

oh and I might know a thing or two about Pro stock too if you wanna bring up that subject.

I may be new to nissan tuning but not to cars.

 

well in this situation burgy there are a few variables that make a difference. The vette, even Z06 is designed to be a top notch sports car for the street. where as the viper was designed as a full blown race car with smog stuff on it. also what are the racing habits of the vette guys vs the viper owners. If the vette guys are going for ranking in a competative series racing every weekend and the viper guys are out there on open track days for fun, they are going to have very different levels of abuse on them. Also are the vette guys running box stock motors or are they modified motors that are failing them? and are they maintaining it like a full blown race car or like an abused street car? all things that clearly make a vast difference.

Unfortunatly the majority of the corvette racing experience i have been exposed to is primarily vintage so i cant say for sure what the LS-X's do in these instances.

 

What year vette? The C5's were said to have oiling issues during hard track driving IIRC. I know the LS2 they fixed the problem and you can buy aftermarket oil pumps for the LS1 to solve the issue as well. I also remember reading thats why then went to a dry sump on the Z06 & ZR1.

 

OMG that arguement was hilarious! Vipers are race cars. Gimme a break. We're not limiting things to ACRs here. Go tell a Z06 or ZR1 owner that a Viper is more of a race car than his Vette, and he'll punch you square in the face. F-ing Z06's have aluminum frames and dry sumps for crying out loud!

 

They dry sumped the LS7 then had to upgrade it again when the LS9 came out. If they need all that crap and 10.5qts of oil to keep a Gen4 motor cool on track, I wouldn't even consider a stock C6 with a regular pan at a track day.

 

Wow! I can't believe ya'll are still arguing. Ya'll kids need to find a better hobby than this. ha ha ha

 

I dont think the LS6 Z06's had any oiling issues for sure, all of those were wet sump, they went to dry sump with the LS7 introduction, but hey they'd probably look a bit silly introducing a stock engine with titanium valves, rods, cnc ported cylinder heads stock, and damn near .600 lift stock, with a regular oiling system

Oh lets not forget that the LS7's dry sump pump is crank driven, and not by a seperate belt, so you wont be having any belt failure taking out your oiling system



Now back to whats important, Lexus V8s, I saw one, taken apart, from an IS-F ! Do not use lexus V8s, they all blow up, quickly.

 

And I want to pick on the flow rate argument a little bit....

K20A.org .:. The K Series Source . Honda / Acura K20a k24a Engine Forum - View Single Post - Flowbench data k20a2 head Here's a stock K20A2 head. I don't even think it's possible to get those numbers out of any type of modified LSx head. Not to mention they strap a 300+ duration cam to it. Yeah it's a 4cyl, but that leads up to my next point....

Flow rates are measured with the valve held static. I've got a 2.5" OD pipe that flows 550cfm. So what. Actual flow into the engine depends on the dynamics of the cam and the effect on VE of the surrounding components. THERE's where you make power. By pumping air. So lets recap some air pumping volumes versus specific output: BMW makes 500 on 5.0L versus LS7's 500 on 7.0L. Audi makes 420hp on 4.2L versus LS3's 430 on 6.2L. Hmmm. So maybe Germany makes better headers than the US and that's where the everything goes wrong? Not likely. So maybe its the combustion chamber design? Oh yeah, LSx has 2 big coasters versus a 4-valve cloverleaf. Yeah, but we're still talking small gains. Hmmm... maybe it's the shit flow through the head. You just can't hammer the valves open with a pushrod like you can with a direct acting valvetrain. I mean, at least they're up to 1990 with variable valve timing, albeit you can't vary intake and exhaust indendently or change the overlap. Engines are air pumps. If you aren't making enough power, you're not moving enough air. Period.

So back to it: Yes the LSx is a great motor.... in spite of the pushrods, not because of them.

So, uh, no Northstar fans in here?