Epoxy for throttle plate screw?
 

Hi,

I keep reading about throttle plate screws coming loose. What type of epoxy are people using to secure the screw?

Is it as simple as putting a dab over the head of the screw?

Sorry if this seems like an obvious question, but it isn't something I want to get wrong!! :eek3:

Cheers

You *keep* hearing about it? How many times have you heard about it? I don't think I've heard about it for at least 2-3 years.

Just apply loctite red to the threads and be done with it. - Or don't remove the screws in the first place?

see cordus' buid thread.
this is a real thing. not just hearsay

Well I make assumptions, but it is playing on my mind. The guy on here with the chopped up compressor wheel, and another post today on the Adaptronic forum showing an MX-5 with ingestion damage.

Are you saying it's only a problem if the screw has been removed before?

Thanks

Why? So the epoxy can go through the engine too when the throttle shaft breaks and sticks the throttle wide open?

Shameless plug for actual solution to actual problem

I'm not sure if I love this solution, but my throttle plate screws were staked... It looks like someone set the butterfly on a die of some kind and staked a crosshatch in the backside of the protruding screw.
At least I know they're not going to fall out... or be easily removed

If you do epoxy it, make sure you prepare the surfaces correctly. At the bare minimum give everything a good wipe down with acetone or some other solvent that will flash off quickly.

Hysol e120hp is a good all purpose structural epoxy but you need to buy an applicator gun and mixing nozzles to use it.

Why the hell would you use epoxy at all? As stated before, Loctite red is what is called for here. High strength threadlocker. Epoxy is a piss-poor substitute.

I'd like one of you to explain how loctite does anything when the problem is this:

Attachment 233346

I'd like to know how the throttle screw got into the compressor wheel?

As Andrew is pointing out the epoxy doesn't keep the shaft from breaking. The skunk2 TB is the only true fix for BP's that see extended high rpm usage.

Henry (Team DNR) JUST had his built F-Prod motor eat a screw from a BROKEN throttle shaft in Savannah. The screws backing out are not nearly as threatening of a problem as the shaft breaking, in my opinion.

From what I remember reading, all the epoxy really does is change the natural resonant frequency to move it away from whatever rpm/vibration is causing the shaft to break.

I have not done any searching, but has there actually been a case of a screw coming loose, but the shaft staying intact?

--Ferdi

In my case, the shaft was fine, it's the SCREW that broke. It didn't back out, the head of the screw broke off. Look at the hole -- you can still see the other half of the screw in there.

http://www.codrus.com/miata/turbine/tb1.jpg

That screw chewed up the pistons, the head, and trashed the turbine.

http://www.codrus.com/miata/turbine/turbine1.jpg

--Ian

Damn that sucks Ian. Are you now running the Skunk2 item?

If so does the increased opening make the throttle really sensitive?

Out of interest I used to have a Jap import track car and it had a rubber damper fitted to the throttle body (OE), I wonder if this is relevant as the car had a slightly higher rev limit?

My skunk2 tb didn't change my throttle response that I could tell.

All the junk2 throttle body did for me was make the throttle touchier. I'm 100% only running one to prevent small bits from destroying $6500 worth of bits and things.

I have a Skunk2 now, yes. I didn't notice any throttle touchiness when switching, though.

--Ian

Braineack: please make a "Race Prep" forum (note the quotes) and banish all autotossers there.