Efi Trials - will I damage a new engine?
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The 998 engine I have needs a complete rebuild for which I have most of the parts now.

Am I likely to cause damage to the new engine during the initial start up and tuning stages when running the efi? Mainly worried about overfuelling and washing the bores.

The basic set up will be as follows: (NA for now)
Ms3 with msx
Mpi inlet manifold with injectors/tb/iac
Twin widebands
Wasted or cnp for spark
Cam sensor in dizzy poll type

I have an old 850 that I could get going for the purpose of the trials otherwise.
Thanks

Edited by minivan63 on 4th Jan, 2012.

No problem, it will only take a couple of hours on the road to get the tune close.

I can let you have an .msq for a 998 that will get you off to a safe start.

I've used 2 newly built engines with Efi so far.

Saul Bellow - "A great deal of intelligence can be invested in ignorance when the need for illusion is deep."
Stephen Hawking - "The greatest enemy of knowledge is not ignorance, it is the illusion of knowledge."

Thanks Paul that's reassuring to hear.

I must admit I have probably been through all your trial posts along with Rod's and Graham's, etc, to try and get an idea of the settings!! An msq would be very helpful thanks for the offer.

I will go ahead and get the engine off for machining then :)

There's only one trial that you need to go through and that's the MS3 one. We were running near optimum after less than one hour on the road.

None of the MS2 and Siamese Code trials are particularly relevant to what you are doing.

Saul Bellow - "A great deal of intelligence can be invested in ignorance when the need for illusion is deep."
Stephen Hawking - "The greatest enemy of knowledge is not ignorance, it is the illusion of knowledge."

This is the first start of the Mig on the MS3 and new engine:

http://www.youtube.com/watch?v=5Pipx9ECDAQ...0beAUAAAAAAAAAA

We got it to start and took it straight up to 2000rpm and started filming.

Saul Bellow - "A great deal of intelligence can be invested in ignorance when the need for illusion is deep."
Stephen Hawking - "The greatest enemy of knowledge is not ignorance, it is the illusion of knowledge."

That was the bit I was worried about after getting it to start up - running up to 2000rpm to bed in the cam. Although I guess there is no load on engine at this stage so could get away with less than perfect fuelling

As Paul says, I wouldn't worry too much about individual settings (msqs) or the difference between MS2 (siamese) or MS3, they both achieve the same thing in different ways.

So long as you start with symettrical (or near symettrical) injection timing and a reqd fuel value that is about right, you won't harm the engine.

And if your reqd fuel value is way out, it won't start :)

Once it starts you can read the widebands and do quick adjustments to most of the settings whilst its running to bed in your cam. There is a tiny pause on an MS2 as each setting is changed (not enough for the engine to stall from 2k RPM) maybe even less on an MS3.

My suggestion would be to familiarise yourself with what all the settings mean first. It took me 20 minutes and four different settings before I got my first one started - with hindsight and experience it's easy, but I made a few silly mistakes the first time.

Good luck.

Schrödinger's cat - so which one am I ???

Saul Bellow - "A great deal of intelligence can be invested in ignorance when the need for illusion is deep."
Stephen Hawking - "The greatest enemy of knowledge is not ignorance, it is the illusion of knowledge."

Schrödinger's cat - so which one am I ???

Yes, very important to understand exactly what all the settings mean, even if you use an established .msq.

Saul Bellow - "A great deal of intelligence can be invested in ignorance when the need for illusion is deep."
Stephen Hawking - "The greatest enemy of knowledge is not ignorance, it is the illusion of knowledge."

Thanks for the replies

I think I have some understanding of the different settings / tables etc from reading the MS documentation, but I'm getting to the stage where I would find it easier to have it set up on an engine to see the effects!

Just need to finish the shell as well and I'll be away :)