SR20 Freddy aka Ebay baffle pan.

[WorkInProgressK]

Its just a little question. I own one and its installed but I lost the oil plug, so I am using the oil pan plug from the stock SR pan. The thread is the same(thank god) but its not taper so its slightly leaking away.

Does anyone know if its Iso pipe thread or bspt/npt. I would guess Iso because of the similarities to the stock plug.

And I cant really remove the plug before the next oil change...sigh.

So if anyone has the pan and can confirm me the dimensions I would be very grateful!

[Def]

Are you talking about the oil drain plug? It seals with a copper crush washer.

The sensor port is 1/8"-27 NPT IIRC, been a long time since I messed with it. My Defi oil temp gauge screwed right in.

[WorkInProgressK]

The one I have came with a taper plug... then other hole I have my oil temp sensor in it. so no problemo.

[Def]

I've never seen a metric tapered thread, but maybe they are out there.

Just use a copper crush washer and torque the stock bolt to about 15 ft lbs. Should be fine, since that's how the stock bolt seals.

[Rittmeister]

You canNOT use a stock drain bolt in the Freddy-style oil pans! The threads are tapered and the drain bolt barely sits in there.

I think I remember that the Freddy-supplied drain plug is 1/4NPT. I always used the drain plug they supplied, and since I'm paranoid I always wrapped it a couple times in teflon tape.

I would hit the hardware store in the plumbing section, should be pretty easy to find a brass or steel tapered plug that fits. I wouldn't try to use the factory drain bolt, it either won't hold (bad) or will strip some of the threads out of the cast aluminum pan (worse).

[Def]

Interesting change they did. The GReddy pan uses the stock bolt.

I'd probably just put in a 1/4" NPT to -6 AN fitting then a -6 AN cap. Just uncap the fitting to drain oil, then cap it back.

[WorkInProgressK]

You canNOT use a stock drain bolt in the Freddy-style oil pans! The threads are tapered and the drain bolt barely sits in there.

I think I remember that the Freddy-supplied drain plug is 1/4NPT. I always used the drain plug they supplied, and since I'm paranoid I always wrapped it a couple times in teflon tape.

I would hit the hardware store in the plumbing section, should be pretty easy to find a brass or steel tapered plug that fits. I wouldn't try to use the factory drain bolt, it either won't hold (bad) or will strip some of the threads out of the cast aluminum pan (worse).

lol dont look at me. The car is sitting with that pan for 2 years. with the same bolt.

So your saying its 1/4 NPT... I have one laying around but its way smaller then the hole if I recall well.

Yes Def I already put a brand new crush washer. worked till I arrived to my oil change. Errr. Doesnt like to be reused.


So yeah I will look into. Thx.

Oh and def the reason I think they chose to go taper is to not need to surface the face for the crusher to sit on. Its probably easier just to drill and tap taper.

[Def]

A 1/4" NPT fitting is larger than 3/8" on the major diameter of the threads if you didn't know. 1/8" NPT is about a 1/4" OD. Has to do with pipe being measured from a "nominal" ID.

[CodyAce]

I'd sooner take the pan off, have a welder tig a tradional drain bung on it, and call it a day. We did this with my buddies Freddy pan and haven't looked back since (although he cranked the threads out of it, WITH a torque wrench)

[WorkInProgressK]

FOUND THE PLUG!!! lol yeah I hate how NPT is offset in sizes. Any idea why you wouldnt call a 1/4 OD plug a 1/4 NPT? Seriously what were they thinking.

I compared it to the plug and the thread pitch gets offset after the 8 thread. Also the OD of the plug is smaller then the mean OD of the taper plug. That is why I was able to fit the stock plug in it without scraping some threads.

[jmauld]

I didn't think NPT was intended to be reused that often? Can you drill it and re-tap it?

[WorkInProgressK]

I sure could. But if it doesnt strip I shouldnt have trouble.