2800? Bogus Hybrid?

[bszopi]

There was a caption in that Hot Rod link I pointed out to Ben...

Those metal lines running underneath the headers are strain gauges that measure cylinder distortion. If the cylinders start to flex too much, the engine management system automatically reduces timing and adds fuel.

Oh, and he says a comparable engine could be built for around $6k.

[fivepointhustla]

That is insane. Being a connected guy he has access to almost anything. That is sweet. Damn I want an m90 real bad now. The strain gauges are new to me that is crazy.

Is the 2nd engine boosted?

[El_Diablo]

though not the example i was talking about, very nice....


the one i was thinking about is a bit more expensive (mostly do to the custom intake *drool*) but made huge power... i believe at the time of writing of the book i have he was just dialing it in at something like 430hp? he was actually looking for upwards of 500hp on pump gas with the only helping hand being water/alcohol injection

[FallenZ24]

Higher compression and boost do go well together. It is all in the tune.

My goal for a 2800 is not just being able to rev to 7k. It's being able to make power up there. The genIII 660 stops making power around what like 5500~6k?

[sharkey]

i can say with my 2.8l ironhead, it will rev to 7, and pulls like a banshee up to it. many people doubt this because i run ironheads and its n/a, but the heads have had some serious porting done, aswell as the intakes. the only thing i see right now is around 6200 i start seeing 1-2" of vaccume, telling me my stock 52mm tb isnt up to the task. the only thing that is limmiting me from reving it higher is i still have hydralic lifters. the way it is, i often find myself hitting my 7k rev limiter cause i dont have a power drop off, and my tach is screwed.

from past expiriance, i know a 3.1l will drop off around 4800rpm, im not to sure on a 3400.

[FallenZ24]

Sharkey, thanks for your input. If you can make power at 7k with your setup, a genIII should have no problem. I think the most limiting factor is the cam. With a nice cam and some boost it should have no problem making power past 7K. I just hope the tranny can take it.

[fivepointhustla]

What is the purpose of trying to make power past 7k?


Sharkey no offense but I find that very hard to believe because the intake you have in the pic is the same as the fiero intake and no matter what all have done they have not made that intake flow good at all past 4500rpms. Do you have a dyno graph? I would like to see your power curve. That intake is the exact reason I made my dual throttle body intake.

[sharkey]

i have around 10 hours porting in the middle and upper intake. i know everyone says the fiero intake is garbage and wont allow it to rev that high, and its a gigantic restriction. all i have to say is those guys arent trying hard enough. now granted even with all my work it still isnt the most ideal, thats why i will likley be modding a 3.4 camaro intake whe i boost it, or ill be building an intake simular to the trueleo short runner.

i dont have dyno graphs, i dont dyno my stuff, i rely on how it performs on the track. most people perfer dynoing, but we dont race on the dyno now do we. although om able to roughly tell were my peak power is from my ve tables. the motor is wanting the highest amount of fuel at 6300 and it starts dropping a bit after that, but not all that much. even though peak power may be 6300 (or roughly there), it still pulls hard up to 7k, and the big reason for reving that high is when i shift it drops me to around 4000rpm, and thats were the motor is realy starting to pull hard, so it works out quite well.

[IsaacHayes]

Sharkey In that light weight car you could really be fast with a 3400 or 3500 though hmmm.. Still, old school can be cool...


2800 I like it. Or how about a 3400 with a 2.8 crank, making a 3100 big bore? Either way, with a larger bore, short stroke, and the high flow of the gen3, it should be a very fast reving NA motor! Turbo would be even better of course!

Doesn't bigger bore = more HP and stroke more Tq? In that case that's good cause we usually have a ton of wheel spinning torq anyways.

[sharkey]

generaly a long stroke motor doesnt like to rev as much being the piston speed is much higher as opposed to a small stroke.

i built mine with oldschool in mind, however if i ever blow it up ill start working on the 3900/6 speed swap with custom intake and a non vvt cam, ported heads, high compression, headers, ect. see how much it would take to get 300hp n/a from it. sure a turbo 3400 would be cool and all, but its been done. i tend to walk the path less traveled, if ya know what i mean.

[SappySE107]

Stock 3400 will keep making power to 6800+ with a cam, compression, and larger throttle body.

[fivepointhustla]

You should just build a trueleo like intake and not even waste time on the 3.4 intake cause it only flows like 25 cfm more than the fiero intake. I was only looking for a power curve that was why I asked for dyno graph. Your right in my case I didn't try at all...why...when I had my intake welded for $130.00. I like to design performance parts. This is the main reason I like these forums cause wee all have the same goals with a million paths...gotta learn something. I see the reason for the high revs...I run nitrous so I make power as soon as I want it.

[IsaacHayes]

Sharkey, yup, that's cool. Half of me wants to go the easy route, 3400, turbo, and be done with it, the other half wants to go unique. I've thought that if you could get a 3900 with at least the stock HP that would be one fun street motor. That motor N/A in your car with 6spd would be brutal!


Someone should do a short stroke gen3 or gen2 w/gen3 top end. A 3100 bigbore/shortstroke would be cool IMO. Put 3500 heads and intakes, headers, high comp pistons (or boost), and let it roar!

[El_Diablo]

hmmm.... 3400, 2.8 crank and 3500 top end? 11:1 c/r? cammed? that would sound wicked.... makes me wanna do it for a daily driven terror n/a malibu

[CNCguy]

For all you guys who are into the short strokes.... why not use a LZ4 3500? It has a 99 bore, 76 stroke, steel crank, LS style heads, forged rods, oil squirters and has over 210 hp stock. Seems like a good starting point to me.