Bench Racing: Blow-Through Turbo.

[BloodOnTheApex]

It seems that I have enough parts laying around, Datsun and not, to have gone ahead and started to have crazy ideas for a new project.

I have an L24 bottom end, seems to be from 1971.  It's been rebuilt at some point in the past, bored 1 mm over.  I would like to bore and stroke it.  Perhaps I would not go larger than 2.8, since I doubt I can afford a diesel crank.  I'm not sure if a bore past 86 mm is safe or worth the expense of custom pistons.  I would like to remain in the realm of factory parts as much as possible.

I suppose that L28 NA dished pistons would be best, bringing the compression somewhere around 8.3:1.  I would like to use the E31 head I have available, but with larger valves and some port work.  This head would raise the compression a bit, yes?  I would like to be closer to 8.5:1.  I suppose I could use a P90 head and flat tops, but I would like to use what is most commonly available and what I already have.

The fun part:  I have a pair of Zenith Stromberg carbs that I picked up from a friend in Norway.  They were factory modified by Volvo for blow through turbo use.  One carburetor fed a 1.9 litre single cam 4 banger with a Garret T3 turbo.  They bolt directly to the L6 SU manifold.  I would like to run both carbs with a 60 Trim T3 whatever intercooler I can find to fit.  I'm not sure at this point if these carbs would provide too much fuel for a 2.8, and if the needles would have to be changed.  If they have to be changed, that would be a real bummer, since they're specific to these carbs and were never available in the US.

Utilizing L28ET, L24, L28E parts, I believe this engine could be built almost completely with OEM parts.

What to y'all think?  How quickly would I explode this junk yard collage?

Any thoughts or experience with methanol/water injection would be apperiated.

[madkaw]

I would run what ever is the cheapest and easiest. Why spend a bunch of money boring and stroking a motor you might just blow up anyway.

[BloodOnTheApex]

I already have most of that stuff.  There's a couple NA 280zx's at my local yard.  I figure I can just bore this block another 2 mm and slap in 280z internals.

 

I would like to increase diplacement for 2 reasons:

 

1) To take full advantage of the amount of fuel these carbs will flow.  A single carb may be used on a 2.3 litre 4 cylinder at 10 psi.

 

2) To avoid fabricating an intake manifold.

 

I was hoping an adequate intercooler, timing, and perhaps meth injection would help to prevent detonating this engine to pieces.  I only plan to run 10-12 psi.....Okay, maybe 15.  15 would be nice.

[madkaw]

So you want to bore the p30 block to put in l28 internals?

I guess I'm missing something here.

Just grab one of those zx motors and work it. It sounds like those carbs are too much for any L displacement anyway.

[Tony D]

Nothing like making more work for yourself on something you plan on breaking anyway.

 

Less talk, do it and tell the results.

 

Wanking endlessly on what if scenarios and overly-complex mechanisms for power when adding boost does the same thing with a flick of your wrist.

 

I can show you non-stroked 1100hp L28ET's

 

Can you show me a 3.2 in that power range? Verified?

 

Put it together first. Then turn up the boost.

 

The L20ET ran to 680HP, you plan on needing more than that?