Question for the KAD experts RE. Supercharger

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Surely, if you run with the chargers out, the fuel mixture will be massively over rich, meaning you'll be washing the cylinder bores with diesel.

I have a aftermarket supercharger fitted to a car I own, and the
injectors, and map had to be changed & a secondary fuel pump added!!!
 
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Hi
It is as simple as that, cut the white cable and insert a switch or in my/your case extend the cable to a switch at the helm. Regarding the damage part of your question, as RIN said he went to Paris on his boat and had the compressors off all the time, his engines are OK, I suppose at the end of the day it's down to how long and at what RPM you are going to run with it off.
For your crazy looking switch may I suggest a 'Missile Style Toggle Switch Cover' - Maplins N42AT, I have a feeling this maybe just the thing for you??

Steve

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peanuts - you know me too well! Perfect switch /forums/images/graemlins/laugh.gif

Now that I think of it, the thought of running the engine rich with the supercharger off isin't too much of a concern because it's not like i'd be sitting in the supercharger range all day - it would be only for a few minutes at a time, and i'd also be running at planing speeds so i'd be giving the engine some 'welly' now and again
 
Poltergeist - I'm not an engine expert so I am not able to comment on that. The switches were installed by a Volvo Dealer at the same time as a service so I assumed they would be ok. Just having looked at the log for the Holland trip, we did 862 miles and we used 1,349 litres of diesel which gave us 2.9 mpg which is actually better than our usual consumption of 2.5 mpg (twin KAD32's)
 
I have 3 way switches. "Off-Auto-On"
The injector pump uses a pressure signal from the inlet manifold to the diaphragm on top of the injector pump (smoke limiter) to alter fuelling.
*EdIt* (Except EDC 44/300) Therefore no boost = no overfuel.
 
Re:Supercharger

It is a switched neg (earth) that operates the clutch. To disable, the simplest way is to disconnect the two way plug Near the top hose.
 
Is all this stuff about switching of this and that necessary ?

I've never worried or even thought about it. Don't remember seeing any advice or warnings in the engine operator manuals and I've read them pretty much cover to cover.

I just drive the boat and let the engines do their own thing.

Am I missing something ? Doesn't the engine know what's best for it.

If I'm at sea doing normal sea speed then that's normal I suppose. But if I'm going down a river I'll be doing way under 1500rpm so from what I've read here neither SC or TC will be running. So what's the problem ?
 
Hi Paul,
We has some advice from a Volvo dealer that the use of the compressor was to to get you onto the plane quickly at those revs that the turbo is not efficient, and that once you are there it switches off, and that like most planing boats, we are good up to 6/7 knots, good at 18+knots but very bad in between. So if we wanted to push on a bit on a river where there are few areas where you are allowed to get on the plane (i.e. up the Seine) Esp the first bit where you have no real stopping places until Rouen, you would have your compressors on for 10 hours a day which isn't good for them. The Dealer did not even charge for fitting so he wasn't trying to get work out of it. I supplied the switches and they were fitted at a a service.
Now I don't know whether this is good advice or not but it hasn't done us any harm
Richard
 
Hi Richard,
I hear what you say about the purpose of the SC & TC.

I still don't really see a problem though. My boat is rubbish between about 7 & 15 knots anyway, so I don't run between those speeds. Absolute minimum nearly planning speed about 13knts but it's not pretty. So at 7knts no compressors running and at 15 knts no problem anyway.

15knts was what we did down the first part of the Seine which is at the speed limit. I guess I would only be kind of knackered if the limit was say 10knts.

But for me it's not just about compressors it's about chronically disproportionate fuel consumption between displacement & planning speed. (7 & 13) So 10 knots is just no good for chargers or MPG. And in addition to that at 10knts Petrolia drags a stern wave that's frightening !!

So I got three reasons not to do between 7-13 knts. Chargers, fuel consumption and waves !

Any idea where that nice MBM cruise club is going this year ?
 
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