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Discussion Starter · #1 ·
Hi

Compression test results, What you think?

Engine cold. Intake manifold off. Toda cams. Its a new cheap gauge so not sure how well calibrated it is. From what I googled so far I should be happy they are all 4 similar but maybe all a bit on the low side

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Cilinder 1 : 155psi (Wet 170psi)
Cilinder 2 : 154psi (Wet 165psi)
Cilinder 3 : 147psi (Wet 160psi)
Cilinder 4 : 154psi (Wet 160psi)
 

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Toda cams have a little longer duration compared to OEM cams both on the low and hi cam profile.
This will create a little overlap at 0掳 VTC reducing compression.
 

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Discussion Starter · #3 ·
Thx, are you the same German that answered this on fb? :) Danke! Confirming my thoughts! although was not sure how much lower the compression test would turn out. Good user name. This k20 is housed in a Lotus as well.
 

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yes.
Me neither. But even small changes of cam timing and/or overlap make a huge difference at low revs on VE and compression.
 

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Cilinder 1 : 155psi (Wet 170psi)
Cilinder 2 : 154psi (Wet 165psi)
Cilinder 3 : 147psi (Wet 160psi)
Cilinder 4 : 154psi (Wet 160psi)
Looks indeed low but perfectly matched beside #3, but looks like a testing issue (wet vs. dry). Like @Lotus said, the bigger the overlap, the less dynamic compression is available. Especially if one combines stock compression ratio with bigger cams. But, I know at least two stock small block engines, having 14.5 to 15.0 bar with TODA A3. But this could be an measurement offset issue.
 
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