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| Rebuilt and Installed a 3.4PR (Page 3/7) |
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Alex4mula
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MAY 01, 09:13 AM
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ManMadeChickens
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MAY 01, 09:18 AM
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My ChumpCar race car on the left, my Daily Driver behind it to the right, My friend Aaron's 1986 SE V6 in front and to the right of that, and then Damian's 1986 "GT" in the far right bay. Counting those four, and my Dad's that was over a couple times... we had 5 different Fieros at this place while working on mine.[This message has been edited by ManMadeChickens (edited 03-18-2014).]
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lou_dias
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MAY 01, 10:12 AM
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Nice writeup. Too bad you didn't have time to do any intake and head work. I might have missed if you removed the excess casting from the stock exhaust manifolds. Even with the higher compression pistons, I doubt you'll pass 145rwhp. That's what I made with that came using stock 3.4 pistons but had intake, head and exhaust work done. I also used 1.52 roller tipped rockers.
Next time, start with a 3400 roller cam block for a free cam upgrade. No holes to drill. Better oil pan. Less friction. I put down 187rwhp with the stock Fiero computer.
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Dennis LaGrua
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MAY 01, 10:31 AM
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A nice project and an excellent post. You achieved good results and thanks for sharing them with everyone. The subject that repeatedly comes up with an engine build/replacement such as this among Fiero owners, is the cost for the horsepower, mileage and performance that it returns. If you spent $1000 -$1500 then you did well but if you spent $3000+ then the DIY engine swap starts to become a very attractive alternative.
Enjoy the fruits of your labor as you've earned it!------------------
" THE BLACK PARALYZER" -87GT 3800SC Series III engine, custom ZZP Intercooler setup, 3.4" Pulley, Northstar TB, LS1 MAF, 3" Flotech Afterburner Exhaust, Autolite 104's, MSD wires, Custom CAI, 4T65eHD w. custom axles, HP Tuners VCM Suite.
"THE COLUSSUS"
87GT - ALL OUT 3.4L Turbocharged engine, Garrett Hybrid Turbo, MSD ign., modified TH125H
" ON THE LOOSE WITHOUT THE JUICE "
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fierohobby
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MAY 01, 10:32 AM
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Great job on the write-up! Thanks for taking the time and sharing the info.
-fh
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thedrue
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MAY 01, 10:56 AM
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Nice work Justin! It was a good project, just wish that darned 2.8 hadn't spun a bearing in the first place. Glad your rollin in the Fiero again and enjoying it. I am slightly embarrassed to be named as a member of the transmission breakage squad... We knew better and everything! Hopefully someone can learn from our stupidity.
When you coming back up so I can get that axle seal squared away?
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Bahrbarian
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MAY 01, 11:06 AM
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Great write up! Thanks for posting!
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ManMadeChickens
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MAY 01, 08:09 PM
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Lou, I have not yet done anything about the manifolds. That's on the list of things to do now that it's running again. If I could make 150 at the wheels, I'd be very happy. From the sounds of it, that's gonna take some more work. If I had to choose, I would definitely start with a 3x00 bottom end. This 3.4 was a great deal I couldn't pass up. Saved me a lot of money doing it this way.
Dennis, I think I'm right about $1500 for this build. Maybe a bit more after the oil pressure sender parts and the multiple gaskets... but it can't be by much. Getting even a small bump in power over a stock 3.4 for a few hundred less than the cost of a stock 3.4 crate motor is totally worth it in my book. I'm certainly enjoying the result, I've put almost 600 miles a week on it since it's been back together.
Damian- fear not, brother. Like I said before, if I had reservations myself, I wouldn't have gone with that strategy. I'm to blame, as I went along with it, and I was actually the one wrenching it when it broke. You gave me that spare 4 speed originally anyhow, so I'm really not at all worried about it. This one drives as good or better than mine anyhow. I might be up this coming weekend Saturday evening through Sunday night. How's that looking for you? The axle seal is apparently only at it's worst at highway speed or more. Around town it doesn't seem to be such a problem.
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mattwa
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MAY 01, 10:47 PM
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The cam was kinda pointless without an intake upgrade, if that's the stock 2.8 intake system. It really chokes a 3.4 with a stock cam, let alone a bigger cam. You will see a large improvement with a better intake. [This message has been edited by mattwa (edited 05-01-2012).]
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Brucepts
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MAY 02, 07:36 AM
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| quote | Originally posted by mattwa:
The cam was kinda pointless without an intake upgrade, if that's the stock 2.8 intake system. It really chokes a 3.4 with a stock cam, let alone a bigger cam. You will see a large improvement with a better intake.
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This will take this off-topic but I think this could be/has been highly debated. It's all going to depend on what your end goal of your engine build is. Not everyone wants or needs to run at max rpm's for peak HP. BUT, CFM and HP numbers do sell parts! This is a pretty hot topic for anyone who does cylinder heads for a living as they combat this "myth" the magazines tout as they sell advertising space in articles.
A big ole hole of an intake might move alot of CFM but it needs RPM to do that, it will be slow and lazy to move the air at lower rpm's. A cylinder sees open and close ramps twice as opposed to peak lift which happens once. So the faster you move the air on open and closing will make a difference in volumetric efficiency of your engine. Smaller ports & intake runners will aid in velocity and this will/can fill a cylinder with more mixture at lower rpm's and make more torque especially on a high compression motor. To some it's not always about peak HP 
I doubt many here have actually studied the velocities within the intake runners and ports to maximize what can be done with stock parts? Not just grinding away and making it larger. As you are aware I have actually started showing those numbers in a past post and have already disproved some of the "wife's tales" about what is happening in the stock intake.
Just getting in an intake/port and making it bigger is not always the answer. Personally, I am not of the mind-set to bolt on something bigger until I know what I have now is not at it's max potential for some it works for others we want to know the how's and why's . . . it's about the journey along the way
At some point in the very near future I plan on flow-testing a stock 2.8 head and actually seeing what can be gained in cfm and velocity as well as some wet-flow testing.
------------------
"There is no more formidable adversary than one who perceives he has nothing to lose." - Gen. George S. Patton
http://www.flowbenchtech.com
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