Being re-introduced into the world of Fieros after 10yrs or so, I see a lot of talk about a Quad 4 engine. What is this? What does it come out of? Does it give more hp/performance than the iron duke engine?

quote Originally posted by Techbot: Being re-introduced into the world of Fieros after 10yrs or so, I see a lot of talk about a Quad 4 engine. What is this? What does it come out of? Does it give more hp/performance than the iron duke engine?

Quad-4 was introduced on 87 oldsmobile cars and in 88 on the Pontiac Grand Am. They were rated at 140hp and a HO version was 180ish. I think they stopped calling them quad-4 in 93. Aluminum 4valve head, cast iron block and as with most 4 valve engines they make power in the upper rpm band.........Paul

gives more hp than the duke think anything does

they had 2 versions high out put and non high out puts, think the high outs were 180 hp? and the lower 140's? sure someone will chime in

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88 5spd Modified 3800 Series II SC Formula
Modifications 2004 - Intercooler | 2.8 pulley | 1 inch drop | Interior | 17 inch wheels

If I remember correctly there was a rare version of the H.O. Quad4 called W41 with I belive about 190hp. It was only in Olds Calis(sp?) 442 and a year or two of the Achiva's.

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'88 Fiero Formula "Interceptor"
'90 Trofeo "Interceptor XB"
'90 Olds Cutlass Cruiser S (Wife's)

91 or 92 beretta GTZ had 190hp quad 4. They have called it quad 4 later than 93. they used it in the recent model grand am's and sunfires.

Here is a link to a page that will give you information about the quad-4. http://quad4forums.com/darkfox/history.htm They also have information about 2.4 twin cam which is the newer version of the quad-4.

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Cool. So is there a conversion kit to drop this into a Fiero or will it bolt right in?

Look at the 2.2 Ecotech as a newer, more powerful engine replacement. There isn't a swap kit for the Ecotech, but a forum member is looking at duplicating his project for those who want to follow in his steps https://www.fiero.nl/forum/Forum2/HTML/045570.html. The engine doesn't bolt to our transmission, so you would have to get donor engine and transmission.
There are a couple of different Quad 4 install kits available or companies installing Quad 4s and one active installation-turbo link on going https://www.fiero.nl/forum/Forum2/HTML/040182-2.html as we speak. Have fun thinking of the possibilities.
Jim

the quad 4 was in the 90-92 GTZ's (among other cars, i.e. grand am, calais). the 90 and 91 H.O. was rated at 180 hp, the 92 was rated at 185. they actually have a SOHC version also, kinda crappy though and i wouldn't advise it. you could get a W41 qaud rated at 190 from a oldsmobile Calais 442 (new ones, not the muscle car) and Acheiva SCT...or some special edition..not too many made. actually, good luck finding a W41 quad, alot of them are already taken and if they aren't, they usually have a pretty hefty price on 'em. and if you find one in a Calais and the car is in good shape, i would say screw the fiero (i know, i know) and concentrate on the 442...i guess, they are quite the collectible. you can buy a regular DOHC quad 4 and put in the W41 cams and H.O. manifolds and pretty much make a W41 with out too much work. they got alot of this stuff on mantapart.com. 1995 was the last year for the quad 4, it came in grand am's, cavaliers, and sunfires. in 96 they introduced the 2.4 liter (quad 4 was a 2.3) Twin Cam...essentially the same engine...just a bit more reliable if you ask me...less power than the H.O. though.

as far as puttin one in a fiero, i've heard it's some work, you're gonna need a tranny and some custom motor mounts and computer and things like that. a donor car would be perfect. i'm not too sure on all this cause i've never attempted this or looked into it too far either. i have owned two GTZ beretta's and can tell you that they are a blast to drive (as with most H.O. quad 4's). i owned a 92 and still have a 90 that is under construction at the moment.

Here's another use someone found for one.