M30b34 E30 twin-screw supercharged muscle car

[LJ851]

Not sure with boost, 85% is a rough guess of a NA 2V engine.

[Ether-D]

That's what was troubling me, the boost part. So it will be over 100 when forced. I'll run the calculator a few more times with 100+ as the VE and see what that gives me.

[Ether-D]

In order to get a runner size of 1 5/8", it had to have a VE of 140. That doesn't seem to crazy right?

[The Dark Side of Will]

Not sure with boost, 85% is a rough guess of a NA 2V engine.

I think 85% is too high.
VE relates volume of air through the engine to the engine's volumetric pumping rate. We'll assume for the sake of this discussion that air through the engine is the same as air trapped in the chambers and used for combustion. Air trapped in the chambers for combustion translates directly to torque... so specific torque is a proxy for VE.

An S54 makes 85 ftlbs/liter. That's the highest specific torque from a naturally aspirated production engine I've ever come across, so I call that 100%. An M30 at 210(?) ftlbs and 3.4 liters is 62 ftlbs/liter. 62/85 = 0.73, or about 73% VE.

So if the engine has 73% stock, then 140% represents about 14# of boost, assuming ideal intercooling efficiency.

I think 140 is reasonable as a goal for the final state of tune of the engine.

[Ether-D]

^Werd.

On another note, I picked up a m54 crank pulley today to modify and make fit to run the charger. Little by little...

[The Dark Side of Will]

It was e23 then. But mine is still different. It looks to come out straight like the one you posted, but that part is blocked off and then it jogs upward, which is open. I'll post a pic.

Weird.
You might simplify your plumbing by getting the other fitting, but this helps out with the coolant circulation problem noted above.

[Ether-D]

Right?

Yeah, so I need to gather the ole thoughts. I'm running around like a chicken without a head here. Must focus.

To do:
Wiring
3rd pedal
Make a decision on intake setup
Intake setup
Cooling setup
Suspension
Brakes
Interior

This should finished lickety-split. :/

[agent]

This better be finished by April.

[Ether-D]

I know…

[frankenbeemer]

Not 100.

That made me laugh.

Keep it up Ether-D, I love this thread.

[Ether-D]

Alright. I've got the b35 harmonic balancer (HB) and it seems that when I stick it on the b34, the missing two teeth should be just before the cps when motor is at tdc like the single tooth is from the b34 HB. But the gap is actually about 120 degrees past the cps. What is this tomfoolery? And does that mean I need to move the cps bracket to where the gap is, or move the gap to where the cps is (same result).

B34 HB at tdc.


B35 HB on B34 at tdc. The tdc mark on the b35 HB is lined up with the timing cover mark. Just the gap is not where I expected it to be.

[ThatOneEuroE30]

I think I had the same problem. There is an extra sport for the bracket you gotta take the balancer off put the bracket on then the balancer. Or did you do that?

[Ether-D]

Looking at an m20b25 it appears to be in the same place relative to tdc. About 120 degrees past the cps. So much ado about nothing?

[ThatOneEuroE30]

As long as your gap ain't like this

[Ether-D]

Yeah, I don't think that's gonna work…