Bbc Quench

[Chevelle]

Hi was wondering what would be the minimum quench to run on a 540 bbc
10.5 comp, 630 lift, 230@50 duration
Alloy heads , 6000rpm

 

[Grumpy]

welcome to the website

Id suggest you try for no less than .043, Id try for .044 -.045 (1.12 mm)
as a general rule
shoot for a quench of
Minimum .042", max .060", more important is the squish area and chamber shape.

and you might want to read these links

https://www.youtube.com/watch?v=LwLVOegI0Kg

Quench: Unlocking Performance Squished Between the Piston and Head

Quench is the clearance between the piston and cylinder head at TDC. It can affect engine effeciency and performance, if you truly understand it.

www.enginelabs.com

https://www.hotrod.com/articles/0606em-understanding-compression-ratio/

http://garage.grumpysperformance.co...ng-combustion-chambers.2630/page-2#post-54342

http://garage.grumpysperformance.co...mble-and-swirl-quench-squish.4081/#post-12283

http://garage.grumpysperformance.com/index.php?threads/checking-piston-to-valve-clearances.399/

http://garage.grumpysperformance.co...e-springs-and-setting-up-the-valve-train.181/

http://garage.grumpysperformance.com/index.php?threads/valve-train-clearances-and-problems.528/

https://uempistons.com/p-32-piston-compression-height-calculator.html

https://www.lunatipower.com/compression-height

http://www.wallaceracing.com/Calc-Piston-Pin-Height.php

 

[johnnmo]

I agree with Grumpy. Also, limit quench area to no more than 25% of the chamber area.