Re: [doc] French Car
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Re: [doc] French Car



The Island twin turbo boosts the L and R banks independently, however this is still NOT an engine suitable for forced induction. The crank is odd-firing and as a result, the pistons do not counterbalance each-other, there are counterweights on the crank which if you change pistons and conrods, will be wrong. However there are low compression pistons available in the US. To quote God "if the odd-firing PRV could be properly tuirbo'd, why did Renault go away and replace/redesign virtually every part of the engine for the even-firing R25 Turbo and Alpines?"

The problem with NOS is supplying enough fuel - the stock fuel pump cannot maintain the control pressure when the the extra injectors are firing.

Martin

Kevin Milliken wrote:

Hi Chris

Couple of questions and thoughts,

The firing sequence on the volvo engine is uneven as it seems they are
grouped in twos. Therefore the way is to use a bi-turbo setup with a
seperate inlet and carburation system per bank. As it looks as though from
memory that each bank fires alternately, this would then provide an even
boost pressure.

When turbos are factory produced (not Deloreans) the compression is lower
than a conventionally aspirated engine, to take into account the boost
pressure. Are the deloreans which have a turbo fitted running different
pistons and con rods? to decrease the compression or is the boost pressure
set lower to stop the engine meeting its maker?

The alternative could be to just to fit NOS, apparently this will produce
from 50 bhp upwards depending on jets.

Let me know you comments when you have minute, keep cleaning the Paris car.

Regards

Kevin #5959










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