8000 rpm or bust!

[Driver_10]

This sounds a lot like my previous plans for my De-stroked 3500 build. It was to hard to get the machining work done here in houston, so I opted to keep the 84mm stroke and 5.7i rods. (same as a 3400). Im using modified 327 , H-beam rods and L19 bolts. I can get away with a safe 7500rpms without consequence. (which coincidentally, my cam grind has a peak power at 6500-7000rpms. Works out pretty nicely)

My car is a bit heavier than your fiero so I think that I can benifit from the added low-end torque of the higher displacement. (3500 w/ .020 overbore + 84mm stroke. I think that it comes close to 3.6l). In any case, Ill keep an eye on this thread. Keep us updated.

[AaronGTR]

My cranes on the other hand still wouldn't clear the LIM without modification. I sanded right through the bottom of the intake runners trying to get clearance, and ended up having to put a small radius on the nose of four of them. Same thing with the Scorpion SBC rockers I have now, which are much thicker and heavier duty than the cranes where. The nose of the rocker (on the pushrod end) won't clear the bottom of four of the intake runners. I put the same radius on all my Scorpion rockers and weighed them all on a digital scale so they would be balanced.


On a side note, I still have the cranes if anyone wants them.

[geoffinbc]

Yea some rocker may work without modification. Harland Sharp has a set that look like it is much smaller profile in the back and may work. When I put a set of Cranes on a 3400 the LIM was all that needed clearancing.

[AaronGTR]

Don't forget you will need to modify the rockers to fit under the LIM, and you will need heat treated pushrods and guide plates to use the floating rockers. The roller tips will be nice for high rpm, but not sure about the extra side to side movement and friction from the guide plates. I'd be most worried about that and the timing chain.

[geoffinbc]

Your right the valvetrain will be the limit. For a cam as specialized as your looking for I would just call COMP cams when you have all your specs in order. With a turbo you also need to calculate the expected pressure between the exhaust valves and the turbo. The pressure differential between the exhaust and intake side is critical when picking the right turbo cam.

You can use narrow body aluminum rocker arm for a small block chevy and install them with a set of ARP conversion studs. When your given a spring spec after getting your cam get yourself setup with a beehive spring. It will reduce the mass of the spring and you will have a lighter retainer compared to a straight spring. Your also going to need some strong pushrods which are easy to get once you know the length you need.

[ALLTRBO]

I just scored an AMAZING deal on some Carrillo Pro-H (H-beam) rods for my turbo 3200 destroker build (in a Fiero) and it's got me crawling all over in excitement again. These rods will handle anything I can throw at them. In fact, my whole car will explode into a blazing fireball of glory then entirely disintegrate off the face of the earth before these rods will fail on me.

So... 8000 rpm or bust!
Rods- check
Can WOT Tech's best give me the rest of what I'm after?

It'll be a turbo "3200" destroker using:
3500 block (bored about .020)
Diamond pistons for a 3400 (.100 over) w/all the goodies
5.85" rods
Gen II 2.8 crank (or maybe the billet 3" crank that my friend will sell me if it has the 2" journals, just will need the external crank trigger with that)
That gives a 1.95 rod/stroke ratio, relatively low peak piston speeds, and more overlap in the rod journals (vs. the 84mm stroke), it'll just beg for RPM's.

The current shortblock has a 3400 top end bolted to it with a 180 degree rotated upper so I'll need to keep the upper as is, but probably ported and with a 62 or 65mm TB. I'd rather keep the whole top end but with ported heads/intake, but if there's a better reason to use 3500 heads/LIM than ported 3400, I'll do that instead.

The exhaust has 2.25" primaries into 2.5" logs/crossover then into the .82 a/r T3 turbine housing w/a Borg-Warner S282 turbine wheel and compressor side, followed by 3" pipe (or 2.5" when I feel like using the muffler, I have a variable bypass in there controlled by a switch in the center console) into dual 2.5" tips. This will flow plenty enough for 8k.

That leaves the valvetrain, the real limit in most pushrod engines. Here's where I'm not so sure, considering what's available.
The Street/Strip Turbo Cam sounds about right for this based on the description, but I've never been great at spec'ing out cams. Keep in mind that a 3.2 is about ~5% smaller than a 3.4 (3.35) and ~9% smaller than a 3.5 (3.499) so it'll rev a little bit higher with the same cam. I'm worried about going bigger than this anyway because bigger = more load on the rest of the valvetrain at a given RPM. I don't want to make peak power at 8k, just enough to keep it going strong so I can be in the right range going into the next gear (better area under the curve that way).
So for all you 60V6 cam guru's, what thinks you?

From what I gather, the best as far as the rest goes is this:
Double roller timing chain (of course)
Manley titanium retainers and keepers (lighter is better)
PAC 1518 springs
Manley SS valves (are these any lighter than stock? Needed for the power level anyway)
Stock lifters with the TCE LS springs

Do you think this would handle it? Are there any better options available? Are there any full roller rockers available for Gen III's?

As for the tranny, an F23 5-speed is going in with a Quarter Master twin-disk and this combo should breeze through 8k shifts based on what has been done with the cars it came in.
OBTW, don't try to talk me out of the 3200, we've been there and done that. Please just help me get 8000 rpm so I can post lots of 8000 rpm videos for you!