leakdown tester
 

was wondering if anybody here has made a homade leak down tester,i have lots of bits and pieces laying around the shop.maybe modify a compression tester?

Just don't forget the relief valve. Out to be easy enough to make if you can figure
the threads out for the spark-plug end. After that it's just high-pressure hose, a guage and a relief-valve coupled together.

Ern