[Gmecm] Crank & Cam signals on the 4200 GM six

[Bill Shaw]

Yes,  Google shows me that it is a variable cam problem.  Couldn't you use
the '749's wastegate output to control the cam?  Set it up to have the
'wastegate' come on at 100% duty cycle at 3500 RPM or whatever?

All you need for timing for the 749 is one pulse per cylinder and vss.  That
shouldn't be too hard to come up with.

What would you do for the electronic throttle?

Bill

> From: Bill Shaw <b.shaw at comcast.net>
> 
> What's the problem with exhaust cam phasing?  Does this engine use variable
> cam timing like the Porsche Variocam to move the exhaust cam at a certain
> RPM?  Is it electronically controlled?
> 
> Bill
> '84 928s 5 sp. Vortech/749
> '86 944 - http://bill.shaw.gotdns.com/red944/p-944fs.htm
> (several other 1/2 motor p-cars, too!)
> 
>> From: jb <jonnbell at gmail.com>
>> 
>> weve discussed this a few times and im working on that engine myself,
>> but the real problem is the exhaust cam phasing.  check out
>> inliners.org for their message board discussion as well
>> 
>> On 4/7/06, Mike V <efi at dyakron.com> wrote:
>>> Does anyone know what sort of signaling
>>> the new GM 4200 six cylinder uses on crank & cam?
>>> It would be great (read: inexpensive) if you could
>>> adapt a 7730 or 7749 to these engines.
>>> MV
>>> 
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