Building a 3.2 Fiero V6

[82-T/A [Work]]

Hey guys,

I currently have running in my Fiero a 2.8 with a 3.1 crank and rods, .040 overbore Hyperutectic pistons, hastings rings, a crappy camshaft (Pro-Builder Phase 2), set of 1.52:1 roller rockers, and about 8.5:1 compression.

Basically, I didn't do my homework before I rebuilt this thing.

I want to keep the 3.1 crank and rods, and the pistons and rings.
When I had it installed, I never balanced it, I just assumed it was because it was a kit (I assumed wrong). It runs fine, but it literally dies above 4,000 rpms.

I intend to go with an H260 CompCams Camshaft.

This is what I was planning on doing, and please tell me if this is an acceptable solution to my problem.

I want this 3.2 to run well, I hope to get about 170-180 horsepower.

Currently I have an 8.5:1 compression. I read somewhere that I can deck the heads (matched with the intake of course) to something like .020 safely. I was planning on doing about half that, and go with a .010 cyl head shaving (with the intake). I also planned on completely balancing the entire rotating assembly to within half a gram.

Then I would of course compliment it with all the usual stuff (complete 1.52:1 roller rockers with the entire top-end set-up), complete port and polish (mostly already done). I already have the bored out 57mm TB from Darrel Morse, I've got the hogged out exhaust manifolds, ceramic coated, along with the Y-pipe. A borla exhaust (don't have that yet), high output ignition coil, 17lb Accel Pintle fuel injectors, and the Holley 250hp fuel pump.

Does that sound like a plan? Will decking the heads by .010 be a good solid way to boost compression? I have plenty of spare Fiero cyl heads, so I'm not worried about re-using them 20 years from now.


Thanks!!!

Also, if anyone else has any other suggestions, I'd appreciate it.

My ultimate goal for this is to have a GOOD solid running Fiero engine, with as much power as I can squeeze out of it, while still having it look stock.

Oh yeah, this will be mated to a 5-Speed getrag as well..


thanks!!!!!!!!!

[v6h.o.]

you wont gain a huge amount from decking the heads but it will likely get you closer to 9:1,

i'd go for some better pistons to bring it up closer to 9:5 or 10:1 personally.

i'd recommend either the H-260-2 cam from Crane, either that or the Comp cams 16-233-4 camshaft. both will bring up the powerband.
or if you want just a bit more camshaft and if you went with a good 10:1 CR i'd go with the Crower Ultra Performance compu-pro cam #03043.

[82-T/A [Work]]

Thanks for the info Yoda (v6ho)!!

Do you know where I might be able to find some better pistons? Unfortunately I have the 2.8 to 3.1 conversion. As I understand it, there are no other piston options for me. There is another set of pistons, but they drop the compression even lower supposedly.

Any ideas?


Thanks!

[Guest]

I know where you can get aluminum heads that will bolt to your fiero intake. They might be a bit pricey but you will not find them anywhere else.

Shaun

[Guest]

H562Cp. I want to say is the part number for the 3.1 pistons with iron heads. This should be around a 9:1 compression ratio, you can always shave a bit from the heads but no more then .010.

Get a 272 cam as it will work with the computer. use the 1.5 rockers. Do lots of intake and port work if you want to make pwoer. Power comes from the intake and the heads. If you dont' get the air flowing well through the heads you wont' make power no matter what you try to do. So clean those heads up. Pay someone to port them if you have to. install some SI valves and get a 5 angle valve job done. You need as much help as you can get

Hope some of this helps

Shaun

[82-T/A [Work]]

Hey Shaun, are you currently using the 272 cam in your Fiero? If so, I noticed that you're from Florida. Is DB as in Delray Beach? If you wouldn't mind one day, I'd really like to check out your Fiero. I've heard a lot of pros and a lot of cons for the 272 cam. Most people have been suggesting to me to get teh 262 cam, but from what I understand, I stand to aquire much more power from the 272.

Do you go to the car show at the Tower Shops ever on Friday night? Perhaps we could meet up one day there and I could check it out?


Thanks,