Author Topic: To suck or blow? (Read 8778 times)

937ampd · « **Reply #15 on:** July 31, 2013, 08:08:11 PM »

Quote from: danhung11;6762

Very interesting thread. Just curious, how do you plan to keep the constant vacuum to gauge the test itself?

I was thinking about pulling vacuum and holding it with a valve somehow. Make something similar to your normal homemade leakdown tester, just pull instead of push. This would work, correct?

937ampd · « **Reply #16 on:** July 31, 2013, 10:48:09 PM »

Sure do, for those easy one man brake jobs. Have vacuum covered just have to go buy a bicycle pump to put air in.

C-Leigh Racing · « **Reply #17 on:** August 01, 2013, 09:02:06 AM »

The tester I made, used a hand pump from an old blood pressure cuff.
Neil

rablack21 · « **Reply #18 on:** August 01, 2013, 09:07:59 AM »

Quote from: C-Leigh Racing;6857

The tester I made, used a hand pump from an old blood pressure cuff.
Neil

Mine as well.

937ampd · « **Reply #19 on:** August 02, 2013, 07:55:08 PM »

Got the leakdown tester complete. Couldn't find a gauge I was happy with, it reads to 160psi. Pretty big to get a real accurate reading but I made sure I didn't go past 10psi. Held pressure without leaks so I'm pretty stoked. Also can't find a gauge to read vacuum so that's on hold. Just happy this held air. Here's some pics of what I set up.

937ampd · « **Reply #20 on:** August 04, 2013, 05:19:52 PM »

Was able to take the inHg gauge off my bleeder pump and just plugged the void on the pump with a brass fitting. I was also searching online and Grainger carries a gauge that reads psi and inHg for $10. They have bankers hours so I was s.o.l. this weekend, gonna go buy it for future use. This motor did very well though, held 6.5 inHg for well over an hour. Time for break-in, my least favorite part.

*update*
Just realized I should have tested at 12.22 inHg not 6.5 inHg. I feel stooooopid!!! Oh well, live and learn.

udontknowme · « **Reply #21 on:** March 21, 2016, 02:39:47 AM »

I wouldn't rule out a carb problem especially if its old. worn out carb will cause endless grief. hard to say where your problem might be but if theres no visible signs of leaks ,either at the seals or gasketed areas and the engine holds pressure then I would probly look elsewhere. even if you had a slight leek I don't think it would be a big deal. ive had the left seal leek a alittle and it didn't seem to affect anything that I could notice. allitle oil behind the stator clued me in but i never did bother to pressure it up, mostly because it still ran fine