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| Quad 4 swap (lot of pics) (Page 4/31) |
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sardonyx247
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JUN 24, 09:01 AM
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Now that the head flows like a stock 086, time do do some bowl work porting.
I opened up the bowls to be the same size as the valve seats, there was a good 1/8" to remove, blended the bowls into the ports, and smoothed the short side radius.
Then did a mirror polish on all of it. This will help carbon from sticking to the walls of the port.
Taping off the valve seats. I used lots of tape and if you hit the tape at all add more tape.
This will/should stop the valve seats from getting nicked.
I also used old valves in the intake to protect those seats.
The rough cut.
The finished exhaust ports, so smooth and shiny. Should be good flowing.
Before and after, The finished bowls.
 
 
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sardonyx247
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JUN 24, 09:25 AM
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Compared to a stock 086 head.
086 on top, ported 753E on the bottom.
Now I have to port the intake, but on a Quad 4 head you just have to clean up the intake, not much to be gained there.
A bunch of parts ready to be cleaned. I took the best parts of the 3 engines.
Our parts washer, it is able to do HIGH pressure HOT soapy water. It is soooo nice.
It runs off of gas for the pressure and deisel for the heat, and special rigged to be able to do high pressure soap too.
Cleaned parts, courtesy of my friend Tim.
Engine mounts.
Tim spent a few hours and wire wheeled/brushed the cradle, to get ready for paint and to get rid of that east coast rust.
I got a bunch more to do tomorrow, almost time for reassembly, and only a week into it. 
Questions and comments are always welcome too. 
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sardonyx247
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JUN 24, 09:35 AM
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| quote | Originally posted by Quad GT:
Since 1992 Ive been driving my "85 GT with a Quad 4 16V H.O.
This little motor just never quits and loves revving
Soon Im going to have to do a full rebuild, any particular mods that you suggest? Turbo? Now that would be interesting. |
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Mods to suggest.?.?
Not sure on years that have these,
get the small crank pully, I think 90-92'
the biggest exhaust manifold, some are smaller than others, but they look the same.
the W41 cams 5HP
The W41 chip 5HP, and raises the redline from 6700 RPM to 7400 RPM. I can always burn you a chip if you need one.
Good free flowing exhaust,
get a high flowing head and have it ported.
gasket match the intake manifold
Use a power adder, boost and NOS are always fun, but must be built for.
And that is whole nother build itself.[This message has been edited by sardonyx247 (edited 07-30-2012).]
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ericjon262
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JUN 24, 06:58 PM
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Keep it up! ------------------
there's a Group on 60degreeV6.com for us 660 Fiero owners!
Fiero Owner's group on 60degreeV6.com
I know these lines Look crooked on paper, but I swear I've got them straight in my head.
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Carcenomy
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JUN 25, 02:41 AM
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Just a quick question regarding Quad4s, what's the story with the 2.4 Twin Cam LD9? Do any of the W41 or Quad4 HO parts fit it?
Pretty cool build by the way, quite fond of the concept. It just looks the part in a Fiero. 
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sardonyx247
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JUN 25, 05:08 AM
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| quote | Originally posted by Carcenomy:
Just a quick question regarding Quad4s, what's the story with the 2.4 Twin Cam LD9? Do any of the W41 or Quad4 HO parts fit it?
Pretty cool build by the way, quite fond of the concept. It just looks the part in a Fiero. |
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The 2.4L came after 95, the only way to get the cams to fit is you have to get the Intake cam from a 95 as the power steering gear is different, (called "the secret cam swap") but I believe the exhaust cam fits. I have seen a page with the H.O. Intake manifold moddified to fit, I think they cut off the flange and welded the 2.4 one on. The rest of the parts I don't know off hand.[This message has been edited by sardonyx247 (edited 06-25-2012).]
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sardonyx247
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JUN 25, 06:18 AM
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I finished up porting the head today, yea
I didn't really touch the intake much at all. Where the valve seats go into the head there was a little bump, smoothed that out. The divider between ports I knife edged a bit, but the rest I left alone. Porting the exhaust is where all the gains are on the Quad 4 head.
But I did polish the combustion chambers to a nice shine. You want to remove as little of metal as possible, just to get a good polish on it. (It eliminates sharp points causeing hot spots, and it helps stop carbon from sticking) I used the old valves I had and polished away.
Before and after the sanding.
More before pics.
All polished out, and done porting and polishing the head.
Now comes the intake manifold.
The intake on the head is bigger than the intake gasket, so the gasket needs to be opened up to match the head.
In this pic the new gasket has been opened up and is overlayed on the old gasket, the black in the post is how much it is opened up over the base gasket.
Kinda hard to see but it's there.
Now that the gasket matches the head, the gasket is alot bigger than the intake manifold ports. Time for more porting.
This shows just how much the manifold needs to be opened.
Again I used a sharpie to mark off the port.
But since I couldn't get the sharpie close enough due to the thickness of the gasket, I also used a sharp nail to scratch a line closer to the edge.
You can see how much needs to be removed and blended in.
Now you can see how much better it is.
On the left port above, there is a bump in the port I also smoothed out to open up the port to match the other ports.
Porting has shown some good gains in the Quad 4, thus where I plan on getting the other 15HP to bring me to 200HP, plus what the bigger throttle body gives too.
On a reg FWD Quad 4s they have headers now good for 15-20HP, having the free flowing exhaust on the Fiero should help quite a bit too
Almost done prepping the parts, then it's time to reassemble.
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sardonyx247
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JUN 25, 07:31 PM
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Carcenomy
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JUN 26, 02:31 AM
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Some pretty interesting reading. Damnit, I was going to use that 3800 in my shed from my old Fiero but heck if you haven't gotten me excited about a Quad!
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zkhennings
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JUN 26, 09:14 AM
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I like.
I wanted to do a quad 4 swap for a while but went another route instead... What did you use to polish the compustion chamber? And did you use those cutting bits in a dremel? I plan on a bunch of porting and polishing real soon and I need to buy bits for a dremel or an air grinder (I have both) And Im just not sure where to get them
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