A friend of mine had a 1098 Sprite motor rebuilt a few years ago by someone (who shall remain nameless), they managed to block the bypass valve to sump drain hole by trying to drill out that little brass plug below the bypass.
Anyway, long story short- it got to about 160psi before the Fram spin-on filter blew the seal out.
I've never had a problem with spin-ons, and I've used everything from cheap and cheerful to UK made Coopers and Oz Ryco.
Like M1100, I always do it up by hand then give it ~1/4 turn with a filter clamp until tight.

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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R.

I guess you might be right.

Although, the spin-ons I use have a nice wide flat seal while the cartridge type have fiddly little thin one that you have to be very careful to get into the groove properly - and are then prone to squeezing out if the filter is done up too tight.

In my view the spinons are more foolproof.

Cheers, Ian

Here is a list of all the vehicles that use the Z418 filter
http://www.partsallover.com.au/details. ... cid=116353
Cheers Pete

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A recent study found the average Aussie walks about 900 miles a year
Another study found Aussies drink, on average, 22 gallons of alcohol a year
That means, on average, Australians get about 41 miles per gallon

Kind of makes you proud to be an AUSSIE