compression testing on engines out of the frame/on the bench

[28hodge]

I didnt really know there was a difference, but I am 99% sure that it will be plumbing solder as its outta my dads plumbing box, so i'd imagine its plumbing stuff.

I had the same problem this time last year trying to solder up some A123 batteries, all it ever did was run off couldn't get it to stick, drove me mad!

[StrayAlien]

Any pics of the compression tester you are building? I am very interested.

[28hodge]

viewtopic.php?f=24&t=39256&hilit=compression+adapter&start=10

All i have done is pulled a plug in bits so that I have the metal jacket seperate from the porcelian insulator. As per the pic in the attached link.

I'll then solder/liquid metal/epoxy resin a small pipe into the end then tap the other end of the pipe to accept a standard compression testing fitment - prob M10x1.5.

Sykes Pickavant actually do a M8x1.0 compression tester adapter, its for a diesel engine and is for use in the glow plug hole, so it would still need some modification, as the threaded end would be too long and it'd hit your piston. Cant find a stockist that will sell me that piece seperate though. The entire compression testing set is £425 so not really an option.

If you had access to a small lathe, it'd be a doddle, just turn down some 13mm hex bar and get yourself a m8x1.0 die.
Drill a hole down the centre and away you go.

[28hodge]

http://www.toolaid.com/content/diesel-t ... 8mm-kubota

This would do!! just need to find a UK stockist.

[StrayAlien]

I've got a few old plugs about .... might be worth a go ...

[lukemillar]

Man, I wish someone would machine up a batch of adpators! I'd be down for one. I'm also in the boat of having old plugs but never got round to making one. Problem is I just don't need one right now so the motivation isn't there

[kostritzer]

http://www.toolaid.com/content/diesel-t ... 8mm-kubota

This would do!! just need to find a UK stockist.

Bought one, it's not very useful actually. The end protrudes too far into the cylinder and will most likely contact the piston. The schrader valve is in the tip of the adapter, so if you remove the end for clearance, you also removed your check valve.

I have three different compression gauges and none of them have a matching quick disconnect fitting for this thing either. I'm sure you could modify it and make it work, but you might as well have modified a spark plug at that point.

I can't believe there isn't a readily available compression tester for plugs this size! What other engines use 8mm spark plugs anyway?

[Neosophist]

http://www.toolaid.com/content/diesel-t ... 8mm-kubota

This would do!! just need to find a UK stockist.

Bought one, it's not very useful actually. The end protrudes too far into the cylinder and will most likely contact the piston. The schrader valve is in the tip of the adapter, so if you remove the end for clearance, you also removed your check valve.

I have three different compression gauges and none of them have a matching quick disconnect fitting for this thing either. I'm sure you could modify it and make it work, but you might as well have modified a spark plug at that point.

I can't believe there isn't a readily available compression tester for plugs this size! What other engines use 8mm spark plugs anyway?

NC30 / NC35 and NR750R (Oval pistoned bike)

You can buy the adapter direct from Honda but it isnt cheap.

Someone must have access to a lathe right, get Kayla or one of the engineers to turn some brass bar down and drill a hole through it, cost will be low, stick an o-ring on the end and your done.

[james66]

Leave it with me ill see what my machinist could do, im guessing everyone has 10mm adapters?
Easiest m8 adapter would be m8 male one end for the plug hole with m10 female other end, that way regardless which compression tester you have you would be able to use it

[dobbslc]

I have a pair of testers and one came with a set of 4 different adapters all on hoses ready to use, I then bought another set with the small Honda size. I think they were either Sykes pickivant or draper & quite cheap.