ROG100

I am about to restock with flappy bearings.
I use INA as they seem to be the best available for a reasonable price.

Apparantly the design has changed - maybe for the better.

The existing design - HK1012-RS - has one seal in one end of the case and no seal at the other end.
The new design and replacement has a seal at both ends.

Does this in any way have a detrimental effect on fit and function in the manifold? I think it is fine and a plus, just wanted to canvas the experts on the forum.

Thanks,
Roger

Pictures are of the existing bearing.

dr bob

Roger-

That's a very suitable replacement. The extra seal will add a measure of comfort against possible vacuum leaks and limit possible contamination of the bearing. I will add that the double-sealed bearing should be mandatory for those with pressurized intakes.

Great find! Keep up the good work!

ROG100

Dr Bob,
This update seems like a win win all round.
Thanks for the confirmation.
Roger

Mrmerlin

if your installing the originals ( single seal) make sure the seal faces outwards this will keep dirt out of the bearings.
I like the idea of 2 sealed edges , Good find Roger!

OBehave

You don't think that there is a reason the original only had 1 seal?Is there any chance the inner seal could end up in the cylinder? Just wondering.Ed

aggravation

I'll take a set!
I just finished re-installing my intake for the fourth time inside of 2 months trying to pin down a possible leak. What I did this last time was bolt up plates to block the intake outlets, plugged the injector holes, plugged everything and pressurized it with intake cowl and MAF, ISV w/hoses etc. installed. I found leakage at both flappy bearings and they are brand new, single seal type.

Hard to say if it's enough to give me the extra 300 rpm's at idle that haunts me but that and the slight leak at the throttle plate shaft cable linkage is all that I can find in the form of an air leak....

So count me in as guinea pig #1!

ROG100

Craig,
You are second on the list - new bearings will be here in 3 or 4 days.
New bearings are $12 each - up a couple of $.
They will ship the same day.
Roger

Bill51sdr

OT... Stan, gorgeous Mustang picture you've got there!

Mrmerlin

George Preddy HO-P

Rob Edwards

Roger-

I'll take 2 pairs. Gracias!


-Rob

ROG100

Rob,
Thanks,
Roger

Ed Scherer

Nice bearings. Thanks for making these available, Roger. Mine are installed and working.

For the record, these bearings are o.d. 14 mm, i.d. 10 mm, 12 mm front to back. [more specs]

I'd like to see a segment on "How It's Made" on how they make these things. I'm always fascinated by manufacturing techniques, particularly of small, intricate items.

Since I enjoy taking photos of stuff, well... here you go:





(Hmmm... these macro shots are the first time I've ever noticed the texture on my workbench surface. )

GregBBRD

While I think the addition of the "extra" seal will help keep the bearing cleaner and will seal the shaft better, there are a couple of possible downsides....

Obviously, the addition of the second o-ring makes the surface area of the bearing rollers smaller, but this application is under such little load, that should not be an issue.

The addition of the second seal will increase the "friction" exerted on the shaft of the flappy butterfly. Since the original spring is designed for the resistance of single seals, it might be possible that doubling this resistance will make the flappy harder to close, leaving it open or partially open. There is enough "spring length" to get an additonal "wrap" on this spring and this might be needed to ensure that the flappy always closes.

jeff spahn

Will these bearings be included in a top end refresh kit list?

Speedtoys

I think they already are, Dwayne has a writeup that said they were, IIRC.