56 cubic inch engines

[Dave Edge]

Hi Eric,

hmm, I think I'll get away with one of the issues you
hit - induction. I've got a 32mm throttle plate and
original (fairly) small bore inlets. Reason being that
I'm bunging a turbo on this thing so I should get good
mixing and the ram of the turbo should make up for the
small throttle plate etc. - I hope!

Re injector sizing - aarrrgh, that's my main worry.
I'm running the injectors from a Ford Fiesta xr2i (UK
car) which had a 1.6 engine capable of about 120 bhp.
"Oh, but that's way too big for your 930cc imp engine"
I hear you all say. I hope not, afterall what can I do
when I want 120 bhp with the turbo attached. 

On the plus side, there is a vacuum/boost sensor of
the fuel reg so the fuelling should go down at idle.
How about extending that theory and providing an extra
bleed valve to relieve more pressure in the fuel rail
when the throttle plate is closed? sounds a bit rough
and ready to me, anybody think it might work?

Cheers
Dave


> I've got a 61 cid motorcycle (Suzuki TL1000R) that's
> injected from the
> factory.  It runs like crap at lower speeds,
> primarly because of the
> induction that's required to produce high specific
> output (big cams, big
> intake ports, big throttle bodies, really big
> exhaust primaries).  That, and
> the hardware doesn't seem to be developed to the
> level of, say, Honda's
> VFR800 or CBR929 (both of which now *finally*
> incorporate closed-loop
> technology, as the EPA is starting to crack down on
> bikes).  
> 
> I'm not sure that there's a lot of pitfalls involved
> with injecting an
> engine like this, unless it's tuned for high
> specific output.  In that case,
> there's going to be some of the same problems you
> get with tweaked big
> engines - low air velocity at low speeds, the
> difficulty in delivering
> accurate amount of fuel throughout the rev range (my
> TL uses two injectors
> per cylinder to help out), and of course trying to
> find properly-sized
> components.


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