[Land-speed] EGT

[Skip Higginbotham]

Dave,
  Lobe separation is 114, .750 valve lift, and the plugs look slightly rich.
Skip




At 09:17 AM 9/30/2008, Dave Dahlgren wrote:
>What is the lobe separation is the real number I am after do plugs 
>look like it is a happy engine? I have run some pretty good overlap 
>in a SC engine that would be too much for a turbo. 107 to 108 lobe 
>centers with an intake centerline of 110 is pretty common. The idea 
>is to blow a little fresh air over the piston to cool it down and 
>screw the fuel consumption or brake specific readings this is not a 
>mileage test..LOL The charge air cooling is a good idea on two 
>fronts.. first it will make more power with less boost second it 
>will lower the intake air temps a ton which will lower the egt as 
>well. Right now I would bet the intake air temps are well over 300 
>possibly close to 400. If you drop the intake air temp 200 degrees 
>the egt goes down with them.  as you suggest the O2 sensor readings 
>are probably not worth worrying about just read the plugs.
>Dave
>----- Original Message ----- From: "Skip Higginbotham" <saltrat at pahrump.com>
>To: "Dave Dahlgren" <ddahlgren at snet.net>; "Adin, David" 
><DavidAdin at mercydurango.org>
>Cc: <land-speed at autox.team.net>
>Sent: Tuesday, September 30, 2008 12:04 PM
>Subject: Re: [Land-speed] EGT
>
>
>>Hi Dave,
>>Cam timing is 322 duration split, ignition timing is 30 degrees 
>>locked, a/f ratios are not accurate (according to gage engineering) 
>>due to short stacks, 12", and sensor about 4" from valve (1 
>>cyl).....but it read .5 to .6 volts at power and RPM until the 
>>rockers both broke on that cyl.
>>Skip
>>
>>
>>
>>
>>At 08:33 AM 9/30/2008, Dave Dahlgren wrote:
>>>tell me about the cam timing and ignition timing a/f ratios if you 
>>>have them..
>>>Dave
>>>----- Original Message ----- From: "Skip Higginbotham" <saltrat at pahrump.com>
>>>To: "Adin, David" <DavidAdin at mercydurango.org>
>>>Cc: <land-speed at autox.team.net>
>>>Sent: Tuesday, September 30, 2008 11:06 AM
>>>Subject: Re: [Land-speed] EGT