I was just wondering what the most powerfull 2.8 youve heard of. My friend has the same engine as me ('84 2.8L) in his truck. It seems to be bone stock, but he claims to have around 245 horses. how much money would be involved in making this engine so powerfull?

 

An imaginary amount. I reckon it could be done, but it would be outrageous. Most powerful 2.8 I've heard of was manufactured by GM in some wierd car running off of two 2.8L engines. The motors each made 200 horsepower. Of course, that is in Naturally aspirated form. A turbo version could easily hit that amount.

 

$7 or $8 on a 6 pack of beer. Drink 'em down real quick and you can turn that 130 hp midget into a 245 hp fire-breathing dragon!

 

245 horsepower sounds kind of outrageous for a 2.8. I think stock they put out like 140 or so

 

An '84 2.8 would be carbed would it not? Fageol makes a supercharger for that engine. With the sc and some other work you could get it above 200hp.

 

its definatly not super charged or even turbo charged. It is definatly carbed. Ive tried telling him that there is no way he can have that much power, but he still doesnt believe me.

 

he's living in a dream world......

 

Yup hes sniffing his exaust fumes too much

I once thought about going carb with my old 2.8. Edelbrock sells a cam/two peice manifold kit that was supposed to (with a holly 390 carb) boost a 2.8 to (iirc) 160 hp..That and a fageol would be kinda intresting, But after i added up all the money it seemed way too much for my dieing motor.

 

Call the local speed shop, ask them for the phone # to a "chassis-dyno place". Call the chassis-dyno place, ask how much it is for a horsepower run.

Then tell your friend you don't believe him, here's the chassis dyno place #, and the "loser" has to pay the cost of the chassis dyno.

I really doubt it's 245 HP out of a 2.8, especially if it's carb'd, and looks stock. Has he done anything to the motor? He might've done a ton of work but kept all the chrome off the motor for a "sleeper" effect. If his motor is all stock, then no way. Of course the previous owner could've hopped it up...

I guess one "indicator" would be if it's the stock E2SE (2 barrel) carburetor. I'm imagining that it would be "impossible" because that 2 barrel can only flow so much air- right? Or am I way off base here?

 

E2SE, assuming same bores as an E4ME, should flow about half... somewhere between 375 and 450 cfm. Not 245hp worth of air, I don't think.

I'd keep the BS flag up on the guy personally.. heck, just last night I was talking to some guy about his '84 SC that came from the factory with a 2.8 MPFI ( riiiight) that could almost keep up with IROCs.... suffice to say I started avoiding the conversation entirely after he refused to accept that the MPFI setup wasn't used in '84.....

 

Yeah...some people just don't know better. But that's why we're here, to inform them!

Max power? from a 2.8? Not sure, but there's a Datsun 510 with a twin turbo 2.8 making over 400 hp

 

If it was a tt i could see him being close to those numbers but bone stock with a 2b carb!? Tell your friend to take a look around this site and see how hard some people have worked to try to squeeze a little more hp out of their 2.8s and he'll see his motor is no place near 245. Hell my 350 probably doesnt have 245 hp!


Wasnt the 84 2.8 rated at like 90 hp or something?

 

120 hp 135/tq or so. I had an 82' S-10 pickup as my first vehicle. It made my camaro look like a supercar.

 

It can be done- but you'd know it when you open the hood- it wouldn't look stock.

Again, GM has successfully exceeded 1.5 hp per cubic inch on full race motors.

That equates to 173ci x 1.5hp per ci = 259.5HP Naturally asperated.

Its all mainly in headwork, intake and exhaust- but you'd better have a bottom end that can handle the rpms/ cam profile.

 

I would imagine that you would ge able to generate that sort of power if you could spin it waaaay fast, like close to ten thousand or so, if induction would support that. Not to mention using unobtanium for all the reciprocating componenets... Just really hard to swallow that this guy has a full-on race motor in his truck. I'd expect to find something like that in a race car.

 

There was this thing called hydrarev I believe that someone talked about before. I keeps the lifters on the cam at high rpm without needing a spring with a large constant. I'll see if I can find the link. Anyways, this kit allows you to increase your redline substantially.

edit: found it! https://www.thirdgen.org/techbb2/sho...hreadid=203925

 

260 HP on a 660 n/a is not impossible......


http://www.domesticcrew.com/660/



it does take ALOT of work tho, and i really doubt that you could grind enough out of those iron heads to get enough flow...

 

Does anyone have any real HP numbers for the 2.8s???

I have done a 2.5/3" intake using custom 3" aluminum tubing and a GN intake pipe, 2.75" exhaust all the way back, crappy Thermomaster HyperTech chip, and make sure the engine is tuned properly and I can easily beat down my wife's 3100 GRand Prix, which is still nothing to sneeze at...

I have been accused of sporting a V8 on a couple of occasions before, and actually had to pop the hood to proove myself.

Oh, and I forgot to mention my homemade "cat"...

 

Now I know the primary users of the aluminum 2.8l block for rwd applications are used in sprint cars. I wonder how much power those are putting out since they obviously don't have to worry about emissions and all that.

 

'84 2.8L only put out 107 Hp from the factory. That E2SE carb and the valves (I've been told) are largely to blame. 245 Hp out of a stock 2.8 in any GM vehicle in 1984 is just not likely. Especially not with that grabage carburetor. I've had 2 V-6 Camaros with that carb....lots of experience rebuilding them

 

Money is really the only limiting factor. If you have enough cash to build n re-cast every part by the number a 2.8 should spin 14,000. a 11,500 red would be cool.

RPMsxGears=Fun

Eliminate the need to burn oil and make it a 2 stroke 11,500 red line 2.8

Reving twice as fast, sweet.

 

I say lets all go this guys house


first we get a good laugh at his 245hp out of a 2.8
second we get a good laugh cause we can have whatever stuff he has been sniffing/smoking
three all our cars would put out 100hp above stock

 

lets see... it took 7 psi on a stock 3.1 in a Turbo Grand Prix to make 205 HP. a stock 3.1 (aluminium heads) makes 145 HP. most of the newer 2.8's ('87-90) made 130 hp.

I had a 1982 S-10 with a carbed 2.8 and on a good day (225k miles) i could still powerbrake it on 215.60.15's. they did make decent torque, but HP was around 100.

245 HP, no way on a STOCK 2.8. now.....

port and polish and shave the heads, P&P the intake manifold, swap the carb out with something decent, headers, underdrive pully, decent cam and a few other things and it would still be under or around 200 HP. those heads suck, just swapping a gen3 top end on a 2.8/3.1 is about a 20-25 HP gain. the flow difference is tremendous.

 

Gen3 is what - the 3100 stuff, that was introduced in '94, or is it even newer than that?

Oh and TGP's seriously ROCK. Seen only one here in Hawaii, old dude who looks like he maintains the car pretty good. The roof rack can go, though...

 

IIRC, gen 3 starts in 95. and yah, it's the 3100 and 3400.

Yes, TGP's do kick ***. someday i'm gonna use that setup in my 91 Z24. it's basically just a stock 3.1 MPFI with a turbo. the pistons are stock, the rods are the stock forged ones. they have slightly lower compression tho....