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| Re: Compound Turbo A Series |
Subject: Re: Compound Turbo A Series
by reuby_tuesday on 2010/10/3 2:14:22
If you are chasing simply what the failure limits are of a std a-series, then its simple enough to hack up something like what you have mentioned.
Engine stand, two turbos, mig welder, safety cage around engine, jerry of fuel. boost guage.
Its a bit hard to really quantify what the approachable limits are unless you have specific details of what you start with.
eg A12, early model block. full beuild, including new bearings, line bored, new rods, pistons, rings etc.
Without starting from a clean slate, any results are difficult to apply to the real world.
You also need to decide on what the ultimate goal is. eg the maximum amount of boost that the engine can hold before failure. Determining what failure is, also needs to be decided. eg leg out of bed in less than 2 minutes or maybe just a blown head gasket.
If the idea is just to boost up a second hand original block till it goes bang just to see what it will hold, then I suspect that you may not get as much useful information as the effort is worth.
The supercharger and turbo idea is a more achievable and realistic project I think, in that the results that it will prduce are more usable to the datsun community in general.
For the record, If I had the cash to burn, and the time, I would do it this way.
A12 block. Full rebuild to std specs.everything new, but std spec parts. No performance or special gear. No custom parts for the turbos excpet the flanges to mount them.
Onlty modification is a carby that can feed enough fuel to allow increased combustion rates.
Failure is determined by the engine able to hold the boost, running for 5 minutes at max boost, without any parts, gaskets, or seal failing.
Once you have that baseline number, you can then begin to modify parts one at a time to find out what adds what.
Or you could grab that block out the back and add two turbos, and wait for the bang.
From general experiance of people from this forumn and around the place, approachable limits of usable boost would max out at about 20psi. But thats usable, and realible enough to be useful. Im sure you could wind it up to 30+psi, but its just not stable enough to be usable.
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