3100/3400

[poormansvette]

Anybody have any idea what a 3100/3400 series motor can be maxed out to without supercharger,turbocharger,or nitrous. In other words, an all out motor ,what horse can be produced out of it with pistons,cam,headwork, etc

[geoffinbc]

400hp on stock internals.

[Drenis]

And thats probably spending about 25 grand too right.

[TurboZ24]

I have seen an NA 2.8 reach around 290 crank HP, but that's in a non-streetable, small powerband racing setup. GM did have the 3.4 prototype in the Beretta Convertible upto 225, so I'm sure that's attainable.

[RidgeRunner]

Then of course there's the 2.5L boat racing engine that was dynoed at 349hp.

[TurboZ24]

I thought the boat 2.5 was supercharged.

[bszopi]

No SC there...

[Sorin]

WTF!? Does each cylinder have it's OWN air intake!?

[Corpse]

"GM did have the 3.4 prototype in the Beretta Convertible upto 225, so I'm sure that's attainable." - Well, that was actually only in the one pace car made.

It used the Aluminum block along with a forged crank I believe and Carillo Connecting rods (far beyond stock), Id on't remember the pistons used or much else though. It was basically built to take some serious abuse.

Although, the Turbo Grand Prix has a few less horses and wasn't built up like the PaceCar engine and, it shows the durability without the extra cost.

Also, that 2.5L boat engine, Iron Duke/Tech4? If it is, we all know that the stock internals of those motors can't take much abuse, serious modifications are normally required to be able for the engine to endure the extra pain. But, you can actually push upwards of 700-800 horse out of the 2.5L GM L4. (But, don't expect any stock parts to be usable)

Nonetheless, I beleive that this question was about how much HP can be made not withstood by the engine.

It is nearly impossible to calculate what you could make for power due to the various parts you can choose.

If you up the compression to somewhere in the 11's you can get away with pump gas (93/94) most of the time. As for the cam setup, AFAIK, there aren't any direct slap-in cams for the engine you are talking about. You can get aftermarket roller and tappet based cams, both hydraulic and mechanical. The downfall is that, you will have no usage of your cam position sensor which will disable Sequential FI and run Batch-Fire mode ("Multiport").


Sorin, I have not seen the picture that you speak of but, it is not uncommon in a high-performance engine for it to have each cylinder divided. Usually, you end up with a velocity stack for each cylinder, either on a carb or with a throttle body(or throttle plate) setup. The fuel injection, if used would normally go below the throttle plate unless it is not quite that sophisticated.

Actually if you go to my website, there is a pictures section with two 70's Ford Super Cobra Jet 428 Intake manifolds, both are fuel injected and I own the one with the orangy-red velocity stacks. http://24.151.142.74/info1.htm

Sorry, I'm bored.

-Dave