Quote:
Originally Posted by Pripyat
I read about building a DIY flow bench. I expected it to take a lot longer than it did. The shop vac fitting fits perfectly in the stock (trashed) cylinder. I had some leftover tubing and fittings that threaded onto a compression tester perfectly.
Basically there is a manometer measuring vacuum in the cylinder at the spark plug port. Massive shop vac pulls a vacuum in the cylinder. Lots of vacuum measured in the cylinder means poor air flow through the open valve. Little vacuum means good air flow. Youtube "DIY flow bench" for similar setups with a thorough explanation.
I made this because I am convinced that the new cylinder head I bought (61mm) has poorer flow than the stock head. I know, you get what you pay for. 
I ordered some items to port the cheap head and want to get it to flow at least as good as the stock head. Hoping to use the DIY flow bench to do that. |
Awesome! Interested to see your comparison test results.
We need way more testing and evaluation in the community to help keep sellers' claims in check. Not saying anything about the head or the seller, but in general the amount of misinformation around GY6 upgrades is getting out of hand.