Here is my problem,,,i have an 88 camaro 2.8, and i'm trying to switch to a 3.4, but on the 2.8 head there is a cold start valve that runs from the fuel rail assembly, to the head of the 2.8. On my 3.4 there is no spot for this valve. Also on the front of the 2.8(head) there are two sensors,,,and on the 3.4 there is only one spot for a sensor, plus a place for something that is behind the water pump, on my 3.4 block there are three wires coming out of this spot(green, red,black). Do i pull these? and try to flip sensors?? PLEASE HELP thanks

 

Are you sure it's on the head? I think what you mean is the cold start injector on the intake. Swap the intakes, cut those wires off the 3.4 as close as you can to the block and don't worry about them.

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--'87 Camaro LT --
Currently undergoing a 2.8->3.4 swap.....

 

ok,,,i think i have figured out what i was doing wrong,,,i take the complete intake manifold right? and i change over the vavle covers? I thought that i only used the top of the intake,,and then the fuel injection. thanks

 

Trying to juump on the train, by standing there, are we?
You swap complete intake systems.
You swap complete timing chain & water pumps
You have both engines out, side by side & RECREATE EXACTLY WHAT WAS IN THE ENGINE BAY, by putting it back on the 3.4 long block.
Oil filter housing, distributor, motor mounts, EGR assembly.
Do NOT touch exhaust manifolds. No need to.
Swap injectors onto old fuel rail. You did get the 3.4 injectors, right?

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Chat Soon,
KED85
Karl
1985 Firebird 2.8 to 3.4 swap project for Smog Happy LA, CA

 

yes i got the injectors

 

Alright, class is open J/K
What do you need to know?
Keep rereading the above message reply and you should be real good.
YOU MUST MAKE THE FUEL RAIL 100% SPOTLESS. Especially inside the fuel rail.
NO DIRT AT ALL!!!!
The rest is observation and action.
Ask any specific question you can, here or better email me.

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Chat Soon,
KED85
Karl
1985 Firebird 2.8 to 3.4 swap project for Smog Happy LA, CA

 

Hey, KED85, why do you call the 3.4 a "long block"??? Is it not the exact same size block? I'm quite sure it is.....just different bore and stroke.

 

Karl, how did you clean out the rail? Did you slosh fuel around inside it and pour it out?


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-Tom P (Hot rodded 1986 Firebird 2.8l) from http://www.f-body.net/mailbag/3rd/3rd_mailbag.html message boards
---Think your car could be pic of the week? Visit http://www.f-body.net for details!

 

Here's what I did to clean.
1. I screwed up big time, got lots of dirt in it by removing the injectors and letting dirt fall in.
My friend said clean it!
SO
I removed everything.
EVERYTHING.
Including fuel pressure regulator housing.
I then wiped outside with kerosene to clean outside.
Then used compressed air inside.
Looked again. Poured kerosene inside. Air pressured it out. Did this about 4 times.
I even picked out stuff inside.
Then brought it to my buddy.
Start reassembling it now.
When it looks clean, it isn't. Keep at it. BE SO **** YOU LAUGH AT YOURSELF.
If you leave anything inside, guess where it goes?

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Chat Soon,
KED85
Karl
1985 Firebird 2.8 to 3.4 swap project for Smog Happy LA, CA

 

Oh, long block.
I call it a long block, as I used the short block with the heads attached.
At Pep Boys, many other places, they call that engine replacment asssembly a long block.
Just the pistons, crank, rods, bottom end block, is a short block.
FROM MY UNDERSTANDING, the 3.4 is the "same" block, more meat in it, to bore it out to a 3.4 litre size.
Educate me if I am incorrect!
I understood you cannot/nor should you bore a 2.8 to become a 3.4.

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Chat Soon,
KED85
Karl
1985 Firebird 2.8 to 3.4 swap project for Smog Happy LA, CA

 

Ok, I happen to be making a point to take a second and poke my nose into the boards cause wicked 88 cam got ahold of me about the swap. KED85, you do not need to swap the timing chain or water pump. I'm not sure which heads you were implying to use but the 3.4L heads can be used.
-pod

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88' Sport Coupe W/ T's
2.8->3.4 5-speed, accel coil-8.8 wires w/ bosch platinums
black and silver, grey interior, w/ 95' cloth seats, 3way power driver

 

I throughly agree that the 3.4 heads can be used. No problem, but, they match the better bottom end of the 3.4.
I used the 2.8 timing chain & pump on my project to compete the disguise and fool anyone looking at my engine.
It has worked. The smog guy believes I only have a 2.8 in there. It cna be smogged without any aggrivationor questions.
ALSO, all my former brakcets and such went right back into place, by swapping the timing chain and pump.
IN MY INSTANCE, it worked, to my goals/needs, 100%.
That is why, I recommend it.
A swap is custom work/job. How one completes it, is always up to the individual.
I also know of another, that did use the 3.4 stuff during his swap. He only drilled an extra hole. Yet, he did not have a 1985 car.
This is the pleasure of Hot Rodding, that individual persons touch on his creation.


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Chat Soon,
KED85
Karl
1985 Firebird 2.8 to 3.4 swap project for Smog Happy LA, CA

 

actualy ked a 3.4 is stroked to! Its been a year sice i put a gm ho 3.4 in my blazer and i forgot the specs but im sure its stroked also. PS wik88 are you getting a new prom also? and ked did you need one after your swap?

[This message has been edited by SUPER-SPORT-CHEVY (edited April 09, 2001).]

 

No,,,to what i understand, we don't need one, it's just a bolt on swap...

 

Hey SSC
Here's why I did not need a need chip, etc.
I used the same computer set up before, as I kept the 1985 electronics intregrated into the 1985 engine bay.
From my understanding the 2.8/3.1 did not have enough meat to make a 3.4.
So I solved the problem by getting the 3.4 long block.
This is just like a 265/283 block. It can only go so far. It cannot be used to make a 350. The biggest a 283 block can go was to 331 (or 327, .030 over).
But starting with a 350 blcok, you can go to 383 & even pushing it to almost 400. But, to thin cylinder wall create distortion in the cylinder for holding shape under punishement of power.
So, a 400 block is used to make the small block 427!
Why?
More meat to remove and keep block in good shape.
Does that help?
I understand the 3.4 block is the same situation. It has the meat, but, the smaller sizes, do not.

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Chat Soon,
KED85
Karl
1985 Firebird 2.8 to 3.4 swap project for Smog Happy LA, CA

 

Hmmm interesting. The dealer told me i must use a upgraded prom or the engine would run lean. I taked to the guys a jet performance and they told me that i would need a stage 2 chip with this swap. I know some people who droped 3.4's in thier fieros "whew they haul a**" and some did do the upgraded prom and some did not. well I was just kinda curious about the chip thing guess its user prefrence and dealer BS. SSC

 

thanks so much for everyones advice,,,,i appriecate it so much,,,,but anyways,,,i'm going to try and drop in the motor thursday,,,i'll keep you guys posted on how it turns out,,,thanks again,,wicked...

 

All I can add is that I did what I did and I run it every day.
Some days hard!
Lean...nah.
I changed the injectors to cure that problem.
Maybe others mixed and matched stuff.
I kept mine all the same. That's how I solved my problems.
I went the easiest secured path.

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Chat Soon,
KED85
Karl
1985 Firebird 2.8 to 3.4 swap project for Smog Happy LA, CA

 

As far as the lack of need for a new prom, that's where putting in the injectors for the 3.4 comes in. 2.8, 3.1, and 3.4 injectors all have different flow rates, while fuel pressure at the rail and base injector pulse width are fairly similar.. not saying pressure or BPW is exactly the same between them, but it's not far off. If the engine does end up running slightly lean even after using the 3.4 injectors you can always bump the fuel pressure up until it gets close enough to 14.7:1 for the ECU to handle the rest.

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'86 Camaro SC, black /w silver racing stripes
2.8l MPFI/700r4 /w special 2nd gear delete option
In search of new v8 engine & transmission, now contemplating t5 swap to get me out of this mess.
MSD coil, Accel 8mm wires, SplitFire plugs, Gabriel hijackers, possible performance chip I don't know about.. gotta crack open the ECM and check sometime