bp valve stem seals

datfreak · Postby **datfreak** » Sun May 02, 2021 10:10 am

About to buy some valve stem seals- has anyone used:
https://mx5mania.com.au/products/valve- ... -1989-2004

I've read in a few places the Supertech ones are too big and leak badly, but unsure about other brand.

thoughts?

manga_blue · Postby **manga_blue** » Sun May 02, 2021 12:28 pm

I would just go with whatever Mania are using themselves

ManiacLachy · Postby **ManiacLachy** » Mon May 03, 2021 8:09 am

I heard similar issues, I bought mine from Supermiata.com - who sourced theirs as a result of the Supertech issues.

These days I don't see any issues with buying from the US, it's usually cheaper despite shipping and FedEx is faster from the otherside of the world than Australia Post is from 3 suburbs away (exaggeration, but you get my point). The only time I have any pause is when I need to consider duties. If the price difference is negligible then I'll support the locals though.

GR124 · Postby **GR124** » Mon May 03, 2021 9:29 am

I just put a new turbo engine together, put in all genuine mazda gaskets n seals. Done a dyno and a track day with no sign of oil from valve stem seals.

rossint · Postby **rossint** » Mon May 03, 2021 4:21 pm

OEM have the best tolerances but they're not cheap. I went with Supermiata valve stem seals after reading about the problems with the Supertechs, they seem to be working so far.

StanTheMan · Postby **StanTheMan** » Tue May 04, 2021 1:45 pm

the cost seem irrelevant when you then are faced with either pulling the head & have t0 replace the headgasket or doing it without removing the head is a serious pain in the butt. Go with OEM. Ive done the same before too. when it comes to the seal kit. stick with OEM.

datfreak · Postby **datfreak** » Tue May 04, 2021 2:46 pm

Thanks for your inputs.
I'm still not sure - mx5mania emailed me back and said the seals are there own brand and is what they use on their own performance engines. I'm very tempted to get the $40 set.
Mx5mania do sell genuine other BP seals, I'm buying the rear seal from them also.

For genuine https://www.amayama.com/ru/part/mazda/kl0210155
Comes to about $100 plus post, but 2 months of postage .

I think it was only the supertechs they were crap right?

Roadrunner · Postby **Roadrunner** » Tue May 04, 2021 5:50 pm

Mania sell a lot of Supermiata stuff. I'd take a guess that the seals they sell are sourced from Supermiata.
The description on both websites are similar

ManiacLachy · Postby **ManiacLachy** » Wed May 05, 2021 8:21 am

Valve stem seals aren't the hardest part to replace if they fail, engine stays in, but it takes a while to perform so if you're getting a shop to do it labour will be the main cost. And, if they fail you won't destroy anything. So all up you can take a chance on the cheaper option.

I'm thinking the same as Roadrunner, Mania wouldn't have made their own they are likely the Supermiata ones due to their relationship. Like I said earlier, I have the Supermiata ones (still in a box), and so Mania's would be a decent option to get.