RE: IML: Big Block Red Hot Manifolds

[Mike Pittinaro <mechimike@xxxxxxxxx>]

I found the problem was solved by richening up the
Thermoquad mixture screws and advancing the timing. 
Took it out for a test drive last night and the temps
(with a 180 stat) stayed at 190 even after prolonged
high speed driving.  And no more orange
manifolds!Timing had been set at 4 degrees BTDC spec,
but it works much better at about 7 or 8 with todays'
gas (vs 1978 gas) and the TQ carb will eventually get
rebuilt or replaced with an Edelbrock, but for now it
seems to be OK.

--- Otis Davidson <otisdavidson@xxxxxxxxxxx> wrote:

>    Remember a while back when the Bus was doing the
> same thing?   It was a 
> lean condition caused by the factory Holley that was
> on it.  I had 30 or so 
> miles to go,and tried my best to richen it up,to no
> avail.
> 
>   The fix:  Install one of my aftermarket Holleys on
> it.  A 750 cfm 
> 4160-3310 with vacuum secondaries.   No more
> orange-hot manifolds after 
> that.
> 
> 
> "otis"  <--'79 440 powered 35 ft RV
>
> ----Original Message Follows----
> From: Mike Pittinaro <mechimike@xxxxxxxxx>
> To: mailing-list@xxxxxxxxxxxxxxxx
> CC: otisdavidson@xxxxxxxxxxx
> Subject: Big Block Red Hot Manifolds
> Date: Tue, 28 Jun 2005 20:57:47 -0700 (PDT)
> 
> Anyone care to lend a helping word of advice on what
> could cause both manifolds on a 1978 400 cu in big
> block to glow red?
> 
> Timing is set to the spec, new t-stat, new fan
> clutch,
> radiator flows OK, belts/hoses OK and lower rad hose
> has the internal spring.  New plugs and wires. 
> Engine
> reverse flushed and new coolant installed.  New
> vacuum
> lines and stoppers.  Engine has a thermoquad
> carburetor.
> 
> My own thoughts are a cracked base of the carb, or
> possibly a leaking intake manifold, something that
> would cause a lean-running situation.  Engine seems
> to
> idle OK though, and has decent power.



		
__________________________________ 
Yahoo! Mail 
Stay connected, organized, and protected. Take the tour: 
http://tour.mail.yahoo.com/mailtour.html 



-----------------  http://www.imperialclub.com  -----------------
This message was sent to you by the Imperial Mailing List. Please 
reply to mailing-list@xxxxxxxxxxxxxxxx and your response will be 
shared with everyone. Private messages (and attachments) for the
Administrators should be sent to webmaster@xxxxxxxxxxxxxxxx
To UN-SUBSCRIBE, go to http://imperialclub.com/unsubscribe.htm