So is there a known length for pushrods on a hybrid yet?

[donk_316]

Ive noticed that there is a lack of definate information on this topic and its basically the last thing left to deal with. I would measure my own setup but its not together yet.

Just got 'stage 1' done and pulled off my carb setup and got my 3.4 to run on a fiero ecm / harness 20# injectors. which is wierd cause my cam is a crane h272 and alot of folks have said it would never work...probably a bunch of folks who havent tried it!

"stage 2" is rip it apart and hybrid it with a custom upper dual plenums with 2 factory fiero TB's, monster compression and dyno tuned chip.

Anyways once i know the length i can cross reference and find a stock app that came stock with that length and save the hassle of ordering custom pushrods.

[v6h.o.]

which cylinder heads are you using Donk? the GEN3?

really there is no actual set lenth as we have all measured different lenths based on amount milled off the heads and different rockers and such.

the lenths ive measured for one or two engines are posted on our dommesticcrew site.

[donk_316]

Yeah gen3 heads. okay ill check it out. thanks.

[Guest]

Yea it will be different for each application as tolerences between all parts are different. You will need a pushrod length checker and remember, with the gen 3 parts, you will need two different sized pushrods. The intake and exh are different lengths. Although I forget off hand which one is longer I am sure someone here knows.

What I want to know is what computer do you plan on using with your gen 3 heads?

Also I doubt you will be able to get the CC of the al heads up to 38 cc's. Maybe 32 or so but thats about 9 cc's overs tock. I wouldnt' try to do too much work to them as you could do more harm then good with the swirl characteristics of the chamber design. You will probably have to go with a really thick head gasket. Probably around .10 or so.



I see at least 94 octane in your future to run this without knock. Or lots of ignition retard.

You have higher then stock compression pistons now yes? I did some calculations awhile ago and with the fiero compression ratio of 8.9:1 with the al heads it jumped to like 13:1 or abouts. If you are running higher compression pistons now which I think I read somewhere that you were, then you might have some real hard problems keeping it out of knock. Might have to run C16 which can be around $5/gal

But yes the 272 cam will run with the stock fiero computer. I could have answered taht for you. Yea most who say it wont' work have not used it on their own car. The stock computer will allow it to run but that doesn't mean it can pass smog which is really what a lot of people are worried about so they go with a wussy ass 2030 cam :YAWN:

Saw your post about the tech tech section on pennocks. I agree. But cliffbag wont' change anything over there. He likes it the way it is. Which is the ghey way.

[donk_316]

Yea it will be different for each application as tolerences between all parts are different. You will need a pushrod length checker and remember, with the gen 3 parts, you will need two different sized pushrods. The intake and exh are different lengths. Although I forget off hand which one is longer I am sure someone here knows.

What I want to know is what computer do you plan on using with your gen 3 heads?

Also I doubt you will be able to get the CC of the al heads up to 38 cc's. Maybe 32 or so but thats about 9 cc's overs tock. I wouldnt' try to do too much work to them as you could do more harm then good with the swirl characteristics of the chamber design. You will probably have to go with a really thick head gasket. Probably around .10 or so.



I see at least 94 octane in your future to run this without knock. Or lots of ignition retard.

You have higher then stock compression pistons now yes? I did some calculations awhile ago and with the fiero compression ratio of 8.9:1 with the al heads it jumped to like 13:1 or abouts. If you are running higher compression pistons now which I think I read somewhere that you were, then you might have some real hard problems keeping it out of knock. Might have to run C16 which can be around $5/gal

But yes the 272 cam will run with the stock fiero computer. I could have answered taht for you. Yea most who say it wont' work have not used it on their own car. The stock computer will allow it to run but that doesn't mean it can pass smog which is really what a lot of people are worried about so they go with a wussy ass 2030 cam :YAWN:

Saw your post about the tech tech section on pennocks. I agree. But cliffbag wont' change anything over there. He likes it the way it is. Which is the ghey way.

LOL! okay where to start... im going to use the 6869 Fiero ECM only because I grabbed it when I was going to boost and it has the capability to run the knock sensor. Supposivly its the most "aggresive' hardware for the Fiero but thats yet to be proved.

As far as the heads im pretty sure from all the stuff ive seen and done on SBC and BBC heads that there is alot of room to open up those CC's. I know what your saying and without touching the squish area and knocking down that "swirl inducer" or whatever you wanna call it, Im pretty sure i can get the compresion down to 12.5 fromt the lofty 16.6 (based on 25 cc CC's) that the heads will give me untouched. Seriously if the flow is 'right going into and through the valve and bowl the 'inducer' is unnessisary. Plus think of the gains ill recieve from unshrowding the valves!

Emissions dont even play into it here so thats not a concern plus I can get my 100+ octane for not much more than normal fuel seeing i know and hang with a wholeseller of race gas.

As far as Pennocks is concerned, its starting to really piss me off with all the absolute retards that post there. I mean c'mon, how hard is it to goto the nut and bolt and buy some bolts as opposed to posting on an online forum and asking for a 'kit'....gimmie a break.

[dbtk2]

Since you weren't sure, the intake pushrods are shorter and the exhuast are longer.

Shawn

[Guest]

See I knew someone here knew that stuff off the top of their head.

Donk, be prepared to do some wiring for the DIS. I am sure the fiero ecm can run dis but will need to have some wires spliced. I know Cooter on the fiero forum did this mod once. Or are you going to try and use the fiero distributor?

[donk_316]

Oh shit. Now your gonna tell me that the distributor wont fit or something...

[Z2_4cams]

ya, it's going to be virtually impossible to run a distributor with a gen 3 top end. some cutting/pasting of the intakes is going to be required.

[donk_316]

Even if i dont use the gen3 plenum? if there is no plenum then is there still interferance?

[Guest]

There will still be some yes. Its not the upper plenum that interferes so much. Its the lower plenum. If you can get the distributor to clear the lower plenum then yes you will then have to deal with the upper plenum. If I remember correctly from my mock up, that the lower plenum doesnt' even allow the dist to sit in the hole all the way. The intake runners interfere with the baseplate of the dist. At least tahts how I remember it and I could be wrong.

I know Coinball on the fiero forum got a gen 2 intake to work. he had to cut part of the bottom of the dist cap off to get it to fit but it was possible. He never did try and drive it though so no idea there as far as the bottom of the cap cut off and driveability issues. He made some posts in the fiero forum about it. I doubt you can find his post as the search function over there blows donkey balls, but I would either look in the tech or the gen chat and just do a search for Coinball. The topic should stick out as to what you would want to look for.

I could mock up the distributor on a spare block I have with a gen 3 intake and show you what it would look like. But that would require me to pull my aluminum block out of storage. Thats not my cup of tea either. its a bit of a hassle but for the right type of motivation I could prob do it.

Or pm cooter on the fiero board. he modified the fiero harness to work without a distributor. by using the wires that go to the distributor to go instead to the coilpacks.

All this talk is probably starting to make you second guess your decision to go to aluminum heads, but I would rather have you be informed, then to buy my stuff and then find out the hard way.

Shaun

[donk_316]

no dude its all good and this doesnt make me second guess anything, if the dist wont work then ill goto DIS but i mean it would seriously have to be near impossible for it not to work for me to give up. I would rather make the dist. work cause i have all the MSD box and coil allready and i hate to ditch it just for DIS.

[Guest]

With enough creativity I think you could get it to work.

The only problem you have with going to DIS is that you dont' have a DIS compatible block nor probably the crank as well.

DIS requires a crank reference signal. I would ask Cooter how he did it as I think he still used a Fiero computer to do it all.

[donk_316]

Okay ill look him up and grill him for info. Thanks...again!

here look at all the good pics:

http://www.fiero.nl/forum/Forum2/HTML/051616.html

[Fierofiend]

I have a spare block I could try to line the plenums up for you. I don't think I have a fiero distributor lying around, but the S10 vacuume advance one could give you a good enough idea. My spare block has the iron heads so I'm not sure how the intake would seat itself. If you want, I can lay it on there just to reference the distributor, let me know...

John..