rebuilding my 3.4 - S-10 Forum
 
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post #1 of 22 Old 09-29-2014, 11:27 PM Thread Starter
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rebuilding my 3.4

ok so I've finally got some time to work on my '85 s10 blazer 4x4.

I've got a 3.4 from a '95 Camaro 140k miles. I'm going to rebuild it what kind of upgrades can I do its going to be my daily driver not a track and semi offroad truck. not looking to go crazy at 300+hp. but would be happy around 200rwhp. I'm running the stock 700r4 and 3.73 rear end.

Also I'm looking at this TBI kit versus stealing parts from 4.3 and newer 2.8 and searching through miles of wires

http://howellefi.com/tbi-kit-universal-v-6.html

its pricey but I'm thinking it just might be worth Idk what do yall think.

thanks

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post #2 of 22 Old 09-29-2014, 11:28 PM Thread Starter
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Re: rebuilding my 3.4

also if someone could point me to an engine rebuild thread or site other than $90 book on amazon
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post #3 of 22 Old 09-30-2014, 07:23 AM
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Re: rebuilding my 3.4

I am going to watch this thread and take notes too. I have an 85 s10 that I ma going to do the same thing with. Maybe madmax will chime in.
One thing I want to do is build one with that crane extreme low end torque cam. It would make it more like a tractor and give a little better fuel economy.

I have the same transmission and rear end as yours too.

mark

85 S10 Durango 2.8L extcab rwd 36k actual miles.
"true wisdom is knowing you know nothing" Paraphrased from Socrates
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post #4 of 22 Old 09-30-2014, 09:30 AM
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Re: rebuilding my 3.4

Really not as difficult as you'd think to do the swap to the stock EFI. That kit would work I am sure, but it's pricey man. Really all you need is to find a truck that had a 2.8 in it, snatch the wiring harness from the truck, the computer, distributor, the intake manifold and TBI. You'll also need to weld a bung for the O2 or grab the Y-pipe too. You will also need a knock sensor. If your truck didn't have cruise you will need to snatch the VSS from the dash of the truck you're scavenging parts from.

You won't have to dig through any wires really if the harness is in good shape. Here's what I did. Get a GOOD schematic and study it thoroughly before you ever attempt to install it. Find the wires that go to the ignition and hot, which are orange and pink as I recall. Connect those to the proper places (constant hot and switched hot). You will have to modify the harness there. I put a secondary fuse box under the passenger side dash and connected all those wires to it for safety. Looks nice too. Connect crank signal wire ( I conneceted mine to the starter solenoid) and the check engine light. Don't worry, this is a LOT easier than you think. There is already a place in the dash for the engine light and the newer VSS fits the old speedo head as stock. Run the VSS to the ECM. The rest of the wires are already in place and you don't have to modify anything there.

Connect your sensors and hit the switch...I'm missing a few things I am sure, but check out my swap in my signature. Don't do like I did and spend three days wondering why it won't start cause you left the coil energizer wire off...
It's really almost plug and play.



1984 xcab s-10 3.4L GM crate engine 91 S10 TBI swap w bored intake, Edelbrock headers. 2" Rough Country Lift. Custom exhaust, shift kit, e-fan.


EFI swap https://www.s10forum.com/forum/f106/...e-help-513616/

My build thread (3.4L)https://www.s10forum.com/forum/f106/...stions-427168/
Quote:
Originally Posted by Racer_X View Post
I had to cut my nut in half .
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post #5 of 22 Old 09-30-2014, 09:40 AM
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Re: rebuilding my 3.4

C'mon JK... you make it sound so EASY.
How about the fuel lines and pump? Remember, this is an 85....
And, I bet he doesn't have a donor vehicle...
If the Howell system is run, it will be a bunch easier to do the install.

BTW, do the TBI engines have a knock sensor?

I don't think you will be able to get 200 RWHP out of an NA 3.4.
Mine has a crazy cam, roller rockers, headers, crazy exhaust, 4 barrel intake and Mallory dizzy. I think it may be pushing 175 - if I'm lucky. It runs high 14s at the 1320, and has a 4.10 rear gear with a 5 speed.
GM claims 160 HP (?) at the crank for the crate engine, which means about 125 RWHP.

Also, if the engine runs well, I would not rebuild it - unless you are going to run higher compression pistons, balance the rotating assembly and maybe port the heads.
Mine has almost 275K miles and still pulls like a freight train. It doesn't use any oil or have any leaks.

I would replace the rod bearings with Clevite 77s (probably not necessary) and the rear main seal. You can to do this when you change the oil pan anyway (4x4 is WAY different than the Camaro). I usually install a new high volume oil pump too. Felpro makes a one piece blue silicone oil pan gasket that is the shite.
I also run a Cloyes true roller double chain set ($$$) - but worth the expense. It outlasts the stocker by a stretch.
There are many cams you can source too. The low end cam will give you mileage and good low end power, but is not big on making large HP numbers.



Jimmykicker has done this swap, he is a good source for info.
Raven built a crazy hybrid 60* V6, he's another good source for info.

S10 addiction:
1)'82 S10, 383, 700R4, Shorty
2) '85 S10, 3.4, 700R4 4x4 stretch cab (Redneck)
3) '90 S10 2.5, 5 speed shorty
4) '91 S10, Built 3.4, 5 speed shorty (Voodoo)
5) '92 S10, 2.5, 5 speed shorty, (Barbie)
6) '92 S10, 2.5 5 speed, Shorty
7) 1979 LUV, Buick 3.8 V6, TH 350 Shorty.
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post #6 of 22 Old 09-30-2014, 10:08 AM
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Re: rebuilding my 3.4

Yeah I know. If I had someone spell it out like it my post it would have been a lot easier. I'm a real visual type person. I was working from scratch. There was another guy that had done it in the past, but I could never find his post.

Lines are no biggie. Patch em in. Low pressure will hold with clamps. Even if he swaps over to the kit he will still need to put in an electric fuel pump to make it work, so that's work either way.

Yeah, they have a knock sensor. It's on the passenger side by the starter.



1984 xcab s-10 3.4L GM crate engine 91 S10 TBI swap w bored intake, Edelbrock headers. 2" Rough Country Lift. Custom exhaust, shift kit, e-fan.


EFI swap https://www.s10forum.com/forum/f106/...e-help-513616/

My build thread (3.4L)https://www.s10forum.com/forum/f106/...stions-427168/
Quote:
Originally Posted by Racer_X View Post
I had to cut my nut in half .
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post #7 of 22 Old 09-30-2014, 10:37 AM
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Re: rebuilding my 3.4

I think I want to have mine dynoed after I have a proper tune done on it. It really runs awesomely. I can get it sideways really easy. I don't know if it is "fast", cause it is still a heavy ass pickup truck, but it certainly is torquey and pulls really hard. It's a hoot to drive!!

Even not properly tuned, it still is more powerful than when it was carbureted...substantially, and gets better MPG.



1984 xcab s-10 3.4L GM crate engine 91 S10 TBI swap w bored intake, Edelbrock headers. 2" Rough Country Lift. Custom exhaust, shift kit, e-fan.


EFI swap https://www.s10forum.com/forum/f106/...e-help-513616/

My build thread (3.4L)https://www.s10forum.com/forum/f106/...stions-427168/
Quote:
Originally Posted by Racer_X View Post
I had to cut my nut in half .
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post #8 of 22 Old 09-30-2014, 11:32 AM Thread Starter
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Re: rebuilding my 3.4

I already have an electric fuel pump installed but its rated for a carbed 2.8 the kit comes with a fuel pump ill just need a regulator to tune it the correct psi, which what are you guys running? And at least ive already got a spot to put the new pump and filter in.

Will i have any advantage in using the 2.8 tbi set up? Other than cost of course.

Jimmy are you running anything special on the motor or just stock, what kind of mpg are you getting?
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post #9 of 22 Old 09-30-2014, 12:04 PM
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Re: rebuilding my 3.4

Carter pump...12-16 psi I think?

MPG? When I had the Rochester I got about 13, and the 4bbl provided about 14-15 as long as I kept my foot out of it (yes 4bbl was better). 18 on the EFI system.

Stock TBI has a built in non-adjustable regulator, so I don't use one anymore. Some older Cadillac units have adjustable ones. And there is also a kit if you really wanna get serious with it being adjustable.

Factory 82-85 intake is pretty restrictive if you look at it. The later one is way better. If this is a stock type bolt on, I'd swap it to 86-93 and bore it. It will definitely be a performance gain by doing that and using 4.3 injectors. Still man, you can do what you want, but that's a lot of coin versus finding parts locally. Then again, if it's good quality, be nice to have a totally new system. Maybe I'm just cheap....

Wait...I did buy a $2000 crate engine...lol

Hey, what is the "add ignition control" option? $300? Wow...



1984 xcab s-10 3.4L GM crate engine 91 S10 TBI swap w bored intake, Edelbrock headers. 2" Rough Country Lift. Custom exhaust, shift kit, e-fan.


EFI swap https://www.s10forum.com/forum/f106/...e-help-513616/

My build thread (3.4L)https://www.s10forum.com/forum/f106/...stions-427168/
Quote:
Originally Posted by Racer_X View Post
I had to cut my nut in half .
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post #10 of 22 Old 09-30-2014, 03:02 PM Thread Starter
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Re: rebuilding my 3.4

Yah i hope i dont the ignition control...
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post #11 of 22 Old 09-30-2014, 04:02 PM
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Re: rebuilding my 3.4

If you have a local pull a part you can get basically everything for about $200...Hell, maybe even spring for a new harness you'd still come out better I think...



1984 xcab s-10 3.4L GM crate engine 91 S10 TBI swap w bored intake, Edelbrock headers. 2" Rough Country Lift. Custom exhaust, shift kit, e-fan.


EFI swap https://www.s10forum.com/forum/f106/...e-help-513616/

My build thread (3.4L)https://www.s10forum.com/forum/f106/...stions-427168/
Quote:
Originally Posted by Racer_X View Post
I had to cut my nut in half .
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post #12 of 22 Old 09-30-2014, 04:17 PM
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Re: rebuilding my 3.4

I like my Holley... I like my Holley... I like my Holley. Just keep saying it and it will grow on you

Actually, mine is amazingly well mannered and starts like fuel injection. I guess it's dialed in almost perfectly.

Funny thing, I don't know why, but my truck gets 22 on the highway at 70 MPH... WTF? Around town though... it SUX.
I'm sure running A/C has somthing to do with that too.

That Howell system looks really hot. I bet you would have a screamer with it. Too bad it's $$$$.

S10 addiction:
1)'82 S10, 383, 700R4, Shorty
2) '85 S10, 3.4, 700R4 4x4 stretch cab (Redneck)
3) '90 S10 2.5, 5 speed shorty
4) '91 S10, Built 3.4, 5 speed shorty (Voodoo)
5) '92 S10, 2.5, 5 speed shorty, (Barbie)
6) '92 S10, 2.5 5 speed, Shorty
7) 1979 LUV, Buick 3.8 V6, TH 350 Shorty.
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post #13 of 22 Old 09-30-2014, 04:39 PM
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Re: rebuilding my 3.4

I did my conversion because I wanted better fuel economy, easier starts and frankly, just to see if I could do it. It was pretty triumphant when it lit off although I felt like killing a M*therF*cker when I had trouble.
My Holley was leaps and bounds better than the Rochester. I remember the first time I stepped on it...I was like...what the hell?!?! Is this the same engine?? I couldn't believe the improvement in performance! I will say this though, I couldn't believe how terrible the mileage was till I tuned it properly and got the correct spring in the secondaries! 11 mpg! LOL. I got it doing about 15 most days...It got that basically if I drove it like grandpa or spun the tires at every light.



1984 xcab s-10 3.4L GM crate engine 91 S10 TBI swap w bored intake, Edelbrock headers. 2" Rough Country Lift. Custom exhaust, shift kit, e-fan.


EFI swap https://www.s10forum.com/forum/f106/...e-help-513616/

My build thread (3.4L)https://www.s10forum.com/forum/f106/...stions-427168/
Quote:
Originally Posted by Racer_X View Post
I had to cut my nut in half .
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post #14 of 22 Old 10-01-2014, 06:00 PM Thread Starter
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Re: rebuilding my 3.4

I forget...

Why cant we use the camaro efi setup?
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post #15 of 22 Old 10-02-2014, 09:47 AM
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Re: rebuilding my 3.4

Quote:
Originally Posted by Z-Bo89 View Post
I forget...

Why cant we use the camaro efi setup?
You can use the Camaro injection, but it will require the engine management system from the donor. (wiring hrness, ECU, sensors, intake assembly, etc.)
I haven't seen anyone do it yet, but the only other issue might be hood clearance on an S10. The engine sits way down - near the weeds - and the intake is pretty tall in a Camaro/Firebird.

Nothing a 4" cowl good wouldn't cure though...

S10 addiction:
1)'82 S10, 383, 700R4, Shorty
2) '85 S10, 3.4, 700R4 4x4 stretch cab (Redneck)
3) '90 S10 2.5, 5 speed shorty
4) '91 S10, Built 3.4, 5 speed shorty (Voodoo)
5) '92 S10, 2.5, 5 speed shorty, (Barbie)
6) '92 S10, 2.5 5 speed, Shorty
7) 1979 LUV, Buick 3.8 V6, TH 350 Shorty.
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post #16 of 22 Old 10-02-2014, 02:30 PM
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Re: rebuilding my 3.4

EH...it'll fit. I had a 4 or 5 inch tall breather sitting on top of my 4bbl which was on a high rise intake. I think Raven had one like that at one time...looked pretty bitchin' in there too. Might do it on mine one day...just to say I did it.

Oh yeah, and if you use an auto, you'll need the computer controlled tranny too unless I am mistaken....



1984 xcab s-10 3.4L GM crate engine 91 S10 TBI swap w bored intake, Edelbrock headers. 2" Rough Country Lift. Custom exhaust, shift kit, e-fan.


EFI swap https://www.s10forum.com/forum/f106/...e-help-513616/

My build thread (3.4L)https://www.s10forum.com/forum/f106/...stions-427168/
Quote:
Originally Posted by Racer_X View Post
I had to cut my nut in half .
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post #17 of 22 Old 10-07-2014, 07:51 PM Thread Starter
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Re: rebuilding my 3.4

I do have an auto... do i need to get a tranny from a newer 2.8 s10???
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post #18 of 22 Old 10-08-2014, 07:28 AM
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Re: rebuilding my 3.4

Nah. The 700r4 was never electronic. The only effect a newer one (than 88 I think?) will render your speedometer unusable since the later trucks went to electronic speedo mechanism. Your 85 will work just fine. I have an 87 EFI system on my truck with the factory trans.

What I meant was if you used the Camaro EFI you would need a Camaro auto trans since it is computer controlled...unless I am mistaken (and often am)...No first gen S series ever used computer controlled transmissions.



1984 xcab s-10 3.4L GM crate engine 91 S10 TBI swap w bored intake, Edelbrock headers. 2" Rough Country Lift. Custom exhaust, shift kit, e-fan.


EFI swap https://www.s10forum.com/forum/f106/...e-help-513616/

My build thread (3.4L)https://www.s10forum.com/forum/f106/...stions-427168/
Quote:
Originally Posted by Racer_X View Post
I had to cut my nut in half .
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post #19 of 22 Old 10-08-2014, 11:07 PM Thread Starter
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Re: rebuilding my 3.4

Glad that got cleared up, i have 4x4 so that wouldn't work anyway...

while i have you guys, i having a performance problem with my blazer. About 2 years ago my tranny went out, my grandpa had a whole powertrain from An '84 blazer with next to no miles, (was totalled at 6000 miles and donated to a tech school that taught auto mechanics was used for basic maintenance training for many years then sat in a garage for the next 15-20 years) we swapped everything out from the motor to the rear diff. I was getting 17-18 mpg with 4.11 gears. Now im getting around 13 but my speedo is off. It reads 45mph actual speed is 51 mph. Currently has 3.73 gears. Tires never changed, one of the lifters in the motor was stuck but got it fixed. Truck seems powerless im thinkin torque converter? Spark plugs, wires, cap and rotor are new.

Torque converter explains poor mpg and sluggish performance, but what would throw off the speedo? Unless the stock tires from 84 were smaller? Stock for 85 is 235 75 15.
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post #20 of 22 Old 10-09-2014, 10:52 AM
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Re: rebuilding my 3.4

The change of gearing from 4.11 to 3.73 is enough to change your speedo reading.
I am not quite sure what you did here... Changed the rear end also?
If you have a 4.11 front diff and a 3.73 rear, you will have a very jumpy truck in 4X4... The front tires will try to turn faster than the rears causing a big problem.
Am I missing something here?

S10 addiction:
1)'82 S10, 383, 700R4, Shorty
2) '85 S10, 3.4, 700R4 4x4 stretch cab (Redneck)
3) '90 S10 2.5, 5 speed shorty
4) '91 S10, Built 3.4, 5 speed shorty (Voodoo)
5) '92 S10, 2.5, 5 speed shorty, (Barbie)
6) '92 S10, 2.5 5 speed, Shorty
7) 1979 LUV, Buick 3.8 V6, TH 350 Shorty.
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post #21 of 22 Old 10-09-2014, 03:35 PM Thread Starter
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Re: rebuilding my 3.4

All the powertrain parts. Motor, transmission, both differentials transfer case all came from the same truck, i know its not a compatibility issue its a what went bad from sitting 15 years issue. Carb was rebuilt and tuned as well.
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post #22 of 22 Old 10-10-2014, 09:10 AM
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Re: rebuilding my 3.4

Any pics of this rig?

S10 addiction:
1)'82 S10, 383, 700R4, Shorty
2) '85 S10, 3.4, 700R4 4x4 stretch cab (Redneck)
3) '90 S10 2.5, 5 speed shorty
4) '91 S10, Built 3.4, 5 speed shorty (Voodoo)
5) '92 S10, 2.5, 5 speed shorty, (Barbie)
6) '92 S10, 2.5 5 speed, Shorty
7) 1979 LUV, Buick 3.8 V6, TH 350 Shorty.
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