[Fot] Video from yesterday at Arizona Motorsports Park

[David Gott]

Just because I’ve missed this myself and watched others do the same; check timing.    I take it you are running webbers if you mention jetting?  Curious about fuel pressure…
Normally would sound like detonation if you lose midrange; possible if you have an intake leak even with low compression.  What do the plugs look like?

I’m likely stating the obvious things, but sometimes the simple is overlooked….
Hope that helps,Dave Gott


Sent from Yahoo Mail for iPhone


On Monday, April 7, 2025, 7:39 PM, Dave Riddle via Fot <fot at autox.team.net> wrote:

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https://youtu.be/MQjU3jhW7Y8
 
  
 
Took the TR4 out in an HPDE3 Session to test how she’s handling. I like how she handles but we have developed a lean condition.  Revs fall flat between 4-5k then come back between 5-6k.  Changed jetting and that did not really help. Neither did hotted plugs. Lyman checked valve adjustments. That was not the issue either. It is odd however that we are blowing out the intake gaskets but no issue with the exhaust gaskets.
 
  
 
Lyman figures we are running about 90 hp at the wheel. Hopefully putting it on a dyno next month will help find the lean issue and maybe some more hp from this low compression engine.  This is the motor (and 5 speed Toyota) that was in the Baja Car which needs low compression to deal with low quality fuel in Mexico.  This fall a rebuilt high compression engine along with a 4 speed Triumph box will be installed.
 
  
 

 
Dave Riddle
 
Business IT Consulting
 
Office: 480.610.8234
 
Cell: 602.692.5276
 
eMail: dave at microworks.net
 
Website: http://www.microworks.net
 

 
  
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