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| Rebuilt and Installed a 3.4PR (Page 5/7) |
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Blacktree
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SEP 20, 12:58 AM
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| quote | | Originally posted by mattwa: I highly doubt removing the restriction on the TB neck of the stock upper 2.8 intake will effect low RPM operation, yet it will very much improve CFM where this cam wants to go. |
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The CompCams 260H is designed for mid-range torque (in the 2000-4000 RPM range). The stock Fiero intake should flow up to 4000 RPM without much parasitic power loss. Granted, porting the manifolds and heads would extend the torque band a bit. But the cam isn't really going to waste.
I was actually reading the thread thinking to myself "why did he put such a mild camshaft in it?" But with the stock heads and manifolds, it makes sense.
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Grantman
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FEB 14, 08:51 AM
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manmadechickens any updates on doing a dyno run? make any changes to the intake/exhaust? ------------------
1986 Fiero GT Fastback
1979 Naked Honda Goldwing
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ManMadeChickens
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FEB 14, 03:40 PM
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Nothing yet. I've been busy with my ChumpCar race car, work, school, etc. I've been thinking it's about time to get it on the dyno. Perhaps Soon. I'd like to know before summer.
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Grantman
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FEB 14, 04:43 PM
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meant to compliment you on your write up with photos. very nicely done and is proving helpful to me for my 3.4 swap. I don't expect to have mine running until April or May.
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NW-Fiero
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MAR 02, 05:35 PM
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ManMade.... If you had left the original 3.4pr pistons in and upgraded the rockers to 1.6 could you have raised the compression ratio above the stock 8.9:1 and also allowing for #17 injectors.....or is this a direct function of internal top end space ? ------------------
Mark
In the Great Northwest!
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ManMadeChickens
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MAR 04, 06:47 PM
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If one leaves the original 3.4L pistons, you are going to have the stock compression ratio of 9.5:1. Installing ratio rockers won't change the compression any, it will simply open the valve more. With lower compression, the motor will make less power, and you could run the stock 17lb/hr injectors from the 3.4L. I had only the 15lb/hr 2.8 injectors from my Fiero, as the 3.4 I started with was a longblock, without any accessories and such. I believe you could still run the 1.6 rockers with the DOHC pistons, I just didn't know for sure, and didn't want to experiment.
Upgrading the pistons in the 3.4 is about the easiest way to get more compression. The .040" 3.4L headgasket for the iron heads is the thinnest stock one available, so you can't go thinner there too easily or inexpensively. Cutting the heads changes the geometry of things too, which is a pain. Custom pistons are going to be many hundreds of dollars, so I figured the DOHC pistons are the cheapest means of upping the compression.
I hope this answers your question.
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ManMadeChickens
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MAR 18, 07:15 PM
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Edited posts to fix image linking issues.
Update - this engine now has 17,000 miles on it. Running great, just as strong as when I broke it in. Very pleased with the results. Ironically, it must be more efficient too. I have been getting between 1 and 2 MPG better than I did with the 2.8, in the same driving style. Open it up a lot, and you have the potential to get worse mileage for sure, but if you behave this has been an improvement. Still no money or time to get it dynoed, but I hope to soon- my college just got a new auto shop facility, and is setting up the dyno there.
Another couple points to make: in my later builds for my racecar, I have found better parts in a couple different spots. I now prefer the Fel-Pro PermaTorque Severe Duty head gaskets, as these have a nice built-up ridge around all the openings. I have not had HG problems with this engine, but I like knowing I have the better parts on there.
In addition, I highly recommend upgrading to the Volkswagen aircooled exhaust gaskets. These are much more robust than the stock one-piece gasket. If your manifold bolts loosen even a little, the stock style gasket blows out very quickly, leaving your Fiero sounding like a single cylinder go-kart or a lawn mower. Not nice. Buy six to do a whole engine. Costs about the same as a Fel-Pro exhaust manifold gasket set, but these last forever rather than having to be replaced all the time.
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ericjon262
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MAR 18, 11:57 PM
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| quote | Originally posted by ManMadeChickens:
Drive one Fiero to rebuild another... This is my Dad's 1985 SE V6 that he's had since new. At about 170,000 miles he replaced his 2.8 with a 3.1. Now 110,000 miles on that motor and going strong. It should hit 300,00 miles next year.
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what wheels are those? they look good.
------------------
1st class A**hole.
we're in desperate need of a little more religion to nurse your god-like point of view...
http://www.fiero.nl/forum/Forum2/HTML/119122.html
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ManMadeChickens
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MAR 19, 12:04 AM
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2002 Chevy Cavalier. They're 5x100, 16x6" aluminum wheels. Available in "painted" like those, or in chrome.
Painted
Chrome[This message has been edited by ManMadeChickens (edited 03-19-2014).]
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ericjon262
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MAR 19, 04:09 PM
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| quote | Originally posted by ManMadeChickens:
2002 Chevy Cavalier. They're 5x100, 16x6" aluminum wheels. Available in "painted" like those, or in chrome.
Painted
Chrome
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Thanks! just need to find a set and some arrowheads for them!
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