Electramotive/Haltech/Motec Fuel Injection - Injected LPG

[Carl Summers]

Michael Bachmann wrote:
> 
> -----Original Message-----
> From:   Carl Summers [SMTP:InTech at writeme.com]
> Sent:   Friday, 13 February 1998 16:08
> To:     diy_efi at efi332.eng.ohio-state.edu
> Subject:        Re: Electramotive/Haltech/Motec Fuel Injection - Injected LPG
> 
> Sorry to be such a pest about this,,,but does this restrict or virtually
> eliminate boost at high rpms???does the intake achieve vacuum at wot
> because of the restrictor...I ask this because I have been involved in a
> great number of restricted carburetion engine programs and worked for a
> major camshaft manufacturer,,so enquiring minds blah blah .....
> -Carl Summers
> Carl,
> 
> 
> 
> In your experience, can much be gained in this format with an alternative camshaft grind as comopared to the N/A grinds that the manufacturer puts out ?
> 
Michael,
   Yes there is always hp to gain by changing the cam specs,,,The
exhaust closing event has to be timed for the rpm band so as not to
waste boost out the exhaust,then intake closing event has to be late
enough so as to broaden the torque band(but not too late or it will
pulse back up through the intake at low speeds, although boost seems to
stay up cylinder filling goes down)Then intake opening event is set to
maximize the overlap cycle(there is a huge difference between total
overlap and effective overlap) for combustion chamber cooling,,static
compression,fuel type and minimum rpm controlls this...then exhaust
opening has to addressed so as not to cause spool up to be too
slow.......I am not familiar with your engine so there are many
questions to be addressed...but hope this info helps....
-Carl Summers