*deep breath - epic post warning....*
How much are race-bearings? And who do I get them from?
rod bearings....whatever you want to call them...nothing special really...
Basically, I take the SR-rods and machine them so they don't fit so tight? That makes sense, given the way the bearings finally gave in my bud's motor.
nope, they machine it so the big end WIDTH is the same as the FSDE rods....
clearences should of course be checked to insure everything is within spec.
An FPDE crank would be cool, but I don't have a local source, and I want the build to be as simple as possible (IF I go in this direction).
look for a wrecked short block - will be easier to get ahold of then the crank on its own funnilly enough - and all the other bits you might need will be there with it
Right now, we're looking at how much the FS-ZE can make, chipped. I'm wagering it'll make about as much as I'm making, maybe more. Then the porting guy is willing to do the intake manifold. Will try to get the FS-ZE guy to bring his 626 mani and his stock FS-DE mani so we can compare everything and I can decide which one to have ported. Port-guy basically wants to remove the VICS and rework the manifold to remove the flow turbulence that the whole shebang induces at high rpm, but if we can get enough flow out of the 626 manifold, we'll use this instead. Currently stuck in the 170-180 bhp range, exactly where I wanted to be when we started.
FSZE wont give a GREAT improvement over the DE - everything is the same save for cams (which you've already dealt with), higher comp pistons and a few other odds and ends...the engines are not THAT different.... and its certainly a no better platform one way or another.
Can't eke out much more without high compression, high revs and bigger valves (though this last part is up for debate). If we can get the power curve to hold up to 6500 rpm, we might get within the 190 bhp range at 7000 rpm (which is still relatively safe)... but that's a far cry from 200 whp. It's more like 160-170 whp. From my torque calculations, for 200 whp, we might need at least 8000 rpm to hit 200 whp, and that's only with a perfect matching of cams, intake, exhaust and high compression. At 9000 rpm, it's a certainty that 200 whp can be reached.
Bigger valves are definantly up for question. However, there are plenty of other head mods that can be looked at. For example, noone has looked at playing with the combustion chamber shape and volume. 7000rpm is safe as houses...7500 is where it gets scary. The VE required for the FSDE with stock crank (without taking into account boring the block) to achieve 250 CRANK horsepower at 8000rpm is 121%, assuming 0.50 BSFC. That is unrealistic. It doesn't start becoming realistic until you ramp the revs up to 9000rpm (108% VE) - but thats assuming your peak power occurs at 9000rpm, which without some REDICULOUS head work, its not going to happen. You'll also need some rediculous internals, custom manifolds and so on and so forth.
Of course, if you can get the engine running with a lower BSFC (say, 0.45) things start looking MUCH better...only 97% VE required. with a mere 2mm overbore, that drops to 92%. Push it to the limit with 3mm, and you're well in the realms of plausable with 90% VE @ 9000rpm on the FSDE Crank.
Moving to the FPDE crank means you can support the RPM being talked about without exotic rod materials and so forth - but the VE Requried for the same power goes up (because displacement drops). Lucky for you, the target HP also drops
So whats this all mean? getting 100hp/L at the wheels NA with the FSDE is hard. Damned hard. You need to push the living HELL out of your engine to do it. It can be done. Its not impossible, but off the shelf bits and pieces are really not going to cut it and you're going to have to get wildly experimental to pull it off.
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RE: water/meth: a friend just eked out 5 whp with meth-injection and programming. That octane boost only goes so far. But he's got a distributor-type SR20... we might be able to fiddle with the timing even more with our electronic ignitions, giving 3 or 4 more ponies than that..
water/meth allows you to run leaner (leaner is meaner) with more timing. Its unreal for a FI, and can help with the last few % on an NA car - unfortunatly, water meth injection is illegal in this competition (refer to page one of the thread)
