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Compression gauge


tonyown

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hi I'm planning to buy a snap on compression gauge set and I wanted to know wich adaptator i need for the shee... I dont understand anything with this kind of number: MT26J2000 M14 X 1.25 STANDARD REACH ADAPTOR

someone can tell me wich one I need in the kit?

thank you

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That 60 dollar Craftsman kit comes will all the adapters you need.

Keep in mind, Tony...unless the adapter that screws into your head has the same depth as an actual spark plug, your reading will be low a few lbs....

 

dajogejr have you used the craftsman one I just got one & only get 145 w/ 20 domes at sea level Ithought that was a little low & I want to run 93 I should have been border line (been runnin 110 until I was sure & then 145 wft ) & yes I did it correctly lol

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To be 100% honest, no I have not. My good friend has a Snap On tool...and I've always used his.

 

I won't trust a cheapy....but, I think Craftsman is a brand I'd trust. I do plan on buying one one of these days...but, 60 bucks can buy me another part for my new build...LOL.

 

Remember to add a few LBS if the adapter doesn't thread into the cylinder as far as your spark plug.

 

At 140ish compression, as long as your timing isn't cranked WAY up....pump gas should be fine if your jetting is correct!!

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i have the craftsman one.... its good... quality like all thier tools... only thign is they didnt put a head to screw it in with a wrench... its a smooth round metal fitting and you have to use plyers or something to get it in there... so the metal gets messedup... i sent sears a question asking about replacing it... i got a number to call and see if they will replace or if they plan on repalcing this tool...

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i have the craftsman one.... its good... quality like all thier tools... only thign is they didnt put a head to screw it in with a wrench... its a smooth round metal fitting and you have to use plyers or something to get it in there... so the metal gets messedup... i sent sears a question asking about replacing it... i got a number to call and see if they will replace or if they plan on repalcing this tool...

 

 

yeah I freaked out when I went to put my plug back in saw all that metal(from the plyers) & thought it was my threads :mellow:

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Personally, I have the SNAP-ON compression gauge, I'll have to check the adapter number tomorrow. Mine also does not have a wrench fitting, but I've found on mine at least that it isn't necessary. I kick out over 175 psi and I've never had a leak to speak of. I haven't looked at the Craftsman but a big selling point to me on the SNAP-ON is the quick disconnect adapters, just like an air chuck. Maybe the Craftsman has that also, don't know?

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cxompression testers with long rubber tubes (like the kind for v8 engine) will show less compression then one with a short tube because more air is inside a long tube compared to s ahort one.

 

I would beg to differ with that statement. Now, if you had said it will take longer (very briefly at that) for a longer tube to reach max psi, I would buy that. The length of the tube will not (within reason) affect the psi reading of the gauge. If you had a very long (I'm talking stupid long, feet) you might see a minimal drop at best. All the longer tube does is make for slightly more air that has to be compressed before it creates a reading on the gauge.

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Both brands Snap On and Craftman are really good tools, but that is kinda odd that they dont have a hex head to tighten with a wrench............

 

Like I said, it's been my experience that even with compression north of 170 psi, hand tightening has provided plenty of sealing. I don't know about the Craftsman, but my SNAP-ON has a large rubber washer if you will, that seals against the spark plug surface.

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