[Gmecm] SB Chevy in boat

[Greg Etchell]

I was wondering the same thing?

I thought about drilling and tapping the exhaust crossover passage in the
intake and installing a heated o2 or drilling and tapping the exhaust
manifold right at the head before the water jacket starts.

The water is not dumped into the exhaust system until just at the end the
exhaust elbow before the rubber coupling.

I have not had the time or energy try either approach yet.

Greg

-----Original Message-----
From: gmecm-bounces at diy-efi.org [mailto:gmecm-bounces at diy-efi.org] On Behalf
Of Don Sauman
Sent: Wednesday, August 16, 2006 8:40 AM
To: gmecm at diy-efi.org
Subject: Re: [Gmecm] SB Chevy in boat

Hi Steve

There was a guy on this list some time ago who was offering information on
TBI conversions for Jeeps. If I remember right, the same person talked about
boat applications. Initially the system was run without an
O2 sensor in open loop mode. He then said that he had worked out a way of
getting an O2 sensor to work. I realise that is kind of muddled but I am
working from memory.

I would be happy to work open loop.

As far as the O2 sensor is concerned, on my I-6 there is one point where I
can access exhaust gas at the end on the water jacket and just before the
exit water injection. I think mine is not quite standard.

Cheers
Don


Steve Ravet wrote:

> 
>
>  
>
>>-----Original Message-----
>>From: gmecm-bounces at diy-efi.org
>>[mailto:gmecm-bounces at diy-efi.org] On Behalf Of Don Sauman
>>Sent: Wednesday, August 16, 2006 1:53 AM
>>To: gmecm at diy-efi.org
>>Subject: [Gmecm] SB Chevy in boat
>>
>>Guys
>>
>>I am looking at replacing the I-6 250ci Chevy/Mercruiser engine in my 
>>21' deep V offshore sport boat.
>>
>>I have 8.5CR Chevy 350 short motor which I will build with (probably)
>>LT1 heads and a TBI manifold. I have a TBI unit ex a C/K truck and a 
>>couple of 1227747 ECM and vehicle wiring diagrams.
>>
>>Can I get some advice on: code for ECM ie BCC etc,  best ignition 
>>system for this application, camshaft type, or any other comments.
>>    
>>
>
>Hi Don, let me add another question to yours.  How do you tune a boat
>installation?  In an I/O boat (for those who don't know) the exhaust
>manifold is cast with a water jacket around it, and water is injected
>into the exhaust so that it can pass through rubber bellows on it's way
>out the stern drive.  It doesn't seem like there's a way to install an
>O2 sensor.  I have a Mercury only block, 215 CI or so 4 cyl aluminum
>block so there's no factory efi.
>
>--steve
>
>
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-- 
Don Sauman
Cythera Communication
35 Asteroid Way
Carlisle 6101
Western Australia

P: 08 9361 0337
F: 08 9361 0581
M: 0427 389 547



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