[Fot] Race Engine Refreshing Frequency - compression results

[Rick Parent]

The numbers are what one would expect doing a cold pressure test. If the engine was hot when you did the test I would pull it.
Rick Parent
"Doing the right thing is always the right thing, regardless of consequences"
 

    On Sunday, October 29, 2023 at 07:37:22 AM MST, James Trudeau via Fot <fot at autox.team.net> wrote:  
 
 Thanks Ken and Tony,
Glad to hear the bottom end has more life. Will do a leak down test and be asking about Triumph top end rebuilders in New England. 
Jim

Sent from my iPhone

On Oct 28, 2023, at 7:06 PM, Ken Knight <kknight at klaenv.com> wrote:



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If you can barrow a leak down tester that is still the best tool to assess engine health.  I also change oil filters after each race and cut it open to see what is trapped inside.   A well built TR race motor can easily do double those hours on the bottom end.  In my opinion the key to long tern motor health, assuming a good build, is a high quality race oil.  My choice is Joe Gibbs Driven XP-3 10-30, I have bearings that look almost new at 50 hrs. using this oil.  No such thing as “cheap” racing oil.  “Never be beaten by parts” K. Kastner.

  

Ken

  

  

  

Sent from Mail for Windows

  

From: James Trudeau via Fot
Sent: Saturday, October 28, 2023 2:06 PM
To: fot at autox.team.net
Subject: [Fot] Race Engine Refreshing Frequency - compression results

  

I finished a 9 weekend race/school/track day season that started in April and finished at Thompson in October with no obvious performance problems. Total of 38 engine hours including warmup, grid, race, cool down. 

  

Did a dry compression test today:
   
   - 210
   - 225
   - 195
   - 200

  

I get some oil blow by at the valve cover cap and maybe some drips from lower end seals (not sure if oil starts at valve cover). 

  

I’m sure I’ll hear a suggestion to do a leak down test and / or wet compression. 

  

Oil filter forensics?

  

In the absence of obvious issues, how much of a tear down is warranted? 

  

Jim

Sent from my iPhone

  

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