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General Category => General Discussion => Topic started by: Pescatore on May 30, 2022, 01:09:04 PM

Title: Oil pressure sensor adapter?
Post by: Pescatore on May 30, 2022, 01:09:04 PM

I would like to measure the oil pressure on my small block V65.
I'm not trying to make a full time monitor, just checking how it varies.
The stock pressure sensor looks like this, with a long stem:
(https://i.ibb.co/vVgrHzf/Oil-Press-Sensor.png) (https://ibb.co/vVgrHzf)

The pressure sensors I find online look like this, shorter:
(https://i.ibb.co/LYkNvNN/Oil-Press-Sensor2.png) (https://ibb.co/LYkNvNN)

Does anyone know what might happen if I use the shorter sensor?  Will it measure wrong, or will oil get into bad places?
Some time ago I saw an adapter, just the stem portion, and I can't find it anymore.
I also will add the 1/8 thread to M12 adapter and a 90 elbow to keep it under the air box.

Thanks,
P

Title: Re: Oil pressure sensor adapter?
Post by: Frenchfrog on May 30, 2022, 01:29:42 PM

The pin part of the original part is crucial...earlier smallblocs used a two piece sender set up but god knows where you would get that from.I think the pin bit has something to do with camshaft bearing location.

Title: Re: Oil pressure sensor adapter?
Post by: Frenchfrog on May 30, 2022, 01:42:44 PM

I think this would be the part here : https://guzziepiushop.de/oeldruckschalteradapter-breva-v7-5.html

Title: Re: Oil pressure sensor adapter?
Post by: Chuck in Indiana on May 30, 2022, 02:21:53 PM

Quote

Does anyone know what might happen if I use the shorter sensor?  Will it measure wrong, or will oil get into bad places?

Neither one. What *will* happen is the cam bearing will rotate, and you will "be in a heap of trouble, boy.."  :smiley:

Title: Re: Oil pressure sensor adapter?
Post by: guzzisteve on May 30, 2022, 04:03:06 PM

$25  from MG cycle to do it right w/light.

Title: Re: Oil pressure sensor adapter?
Post by: Kiwi_Roy on May 30, 2022, 04:45:48 PM

Just hook up a 0-100 psi gauge then, it will run at ~60 psi
You can hook it to the pressure switch or either of the lines supplying the valve gear, they are at full system pressure, there is a flow restrictor in the head.

Title: Re: Oil pressure sensor adapter?
Post by: John A on May 30, 2022, 09:33:24 PM

Do the modern small block oil pressure switches still have the locating pin for the cam bearing?
Edit: I reread . They do.  I must have been feeling good….. :boozing:

Title: Re: Oil pressure sensor adapter?
Post by: Pescatore on May 31, 2022, 10:44:52 AM

Thanks for the info about the bearing.  I'm glad I didn't turn the engine while I had the switch out.
Is it the half bearing #23, or a bearing in the engine casing?  Just trying to visualize the purpose of the stem.

(https://i.ibb.co/s2vtyTF/CamShaft.png) (https://ibb.co/s2vtyTF)

Title: Re: Oil pressure sensor adapter?
Post by: Frenchfrog on May 31, 2022, 02:44:19 PM

That's the one !

Title: Re: Oil pressure sensor adapter?
Post by: Pescatore on May 31, 2022, 03:04:54 PM

 Thanks