[Fot] Race Engine Refreshing Frequency - compression results

[Ken Knight]

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:
1. 210
2. 225
3. 195
4. 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

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://autox.team.net/pipermail/fot/attachments/20231028/ada52a4a/attachment.htm>