[Fot] Fwd: Re: Engine Problem

[Tony Drews]

Msg too long.  Snipped and resent.

TD


>Date: Tue, 07 Apr 2009 22:21:49 -0500
>To: "Gary Horstkorta" <vintage.racer at comcast.net>, <Fot at autox.team.net>
>From: Tony Drews <tony at tonydrews.com>
>Subject: Re: [Fot] Engine Problem
>
>When doing a compression check, make sure you have the carbs opened 
>up.  I had weird compression values, and after remembering to open 
>the butterflies got over 200 psi in each cylinder.
>
>If you ran it hot, you can easily stick a valve.  In my case, that 
>happened between 200 and 220 degrees F.
>
>Mallories have weird condensers, Jack used to scrape off the outer 
>coating where it hit the bracket.  The bracket that holds the 
>condenser has a couple of spikes that are supposed to pierce the 
>outer coating - not very reliable.  Not sure why this would be 
>corner dependent, but could explain why changing out the dizzy would 
>fix the problem kinda.  Rotors have been a problem too, another 
>thing that would have changed with the new dizzy.
>
>SU's (at least the HS-6) can take a surprisingly high fuel 
>pressure.  Also, the brass floats don't seem to like racing gas and 
>can sink sometimes.  With the HS-6's we needed to have the lids on 
>in a certain position or you get starvation in cornering.  Left 
>handers were our biggest problem.  We found that having the fuel 
>inlet at the front of the front carb and the back of the rear carb 
>(may have that backwards but I don't think so) was the optimal 
>setup.  You don't have enough acceleration to screw up the rear 
>carb, and the problem caused by braking fixes itself by the time you 
>get on the gas hard.
>
>I wonder if the new dizzy install got the timing off causing the 
>higher water temp.  Then you stuck a valve.
>
>No fixes, but food for thought.
>
>- Tony Drews
>
>At 07:45 PM 4/7/2009, Gary Horstkorta wrote:
>>Hello:
>>
>>
>>
>>OK, here's a TR4 engine situation I'd like to receive some feedback on.
>>During the winter layoff, no major engine changes just routine maintenance.
>>Engine always started quickly and ran smoothly up and down rpm range while
>>in the garage.  However, at this past weekend's vintage race at Infineon
>>Raceway, I encountered the following:
>>
>>  <snip>