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Old 05-11-2018, 11:07 AM   #1
oemoilleaks
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Default B18 Identification

I'm having a bit of trouble identifying a b18 I'm picking up this weekend.

I can see the casting marks and the serial number but alas, none of those numbers match up to the decoders I've found. I'm hoping someone here can help me decipher what's in the engine.

Full Res pictures here: https://imgur.com/a/5xC7aqt
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Old 05-11-2018, 04:45 PM   #2
hiperfauto
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What's to know? All B18 internals are essentially the same. That one is an early block that doesn't have bosses for the aluminum bell housing brace or for an alternator.

The only real difference would be the compression ratio which is determined by the thickness of the head.
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Old 05-11-2018, 04:55 PM   #3
JohnMc
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And the cam, but you'd probably be swapping that as well.

You can sort of roughly guesstimate how thick the head is by looking at how far down it goes from those flat shelves next to the sparkplugs (pic 1). And that looks pretty thick. Low compression engines were often teamed up with tractor cams to make a lower output engine.

We didn't get the low HP single carb engines in the US market. But even here, they wanted to make sure that their cheapest car, the Pv, didn't outrun their most expensive, the 1800S, even though they had the same engine, and the PV weighed several hundred pounds less. So they stuck the PV with a low compression engine with a tractor cam.
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Old 05-12-2018, 08:59 PM   #4
oemoilleaks
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Quote:
Originally Posted by hiperfauto View Post
What's to know? All B18 internals are essentially the same. That one is an early block that doesn't have bosses for the aluminum bell housing brace or for an alternator.

The only real difference would be the compression ratio which is determined by the thickness of the head.
Ian,

I guess I'll need an alternator bracket adapter. But for the bosses to install the bellhousing brace, is it just as simple as tapping the block? Or am I kind of boned here?

Last edited by oemoilleaks; 05-12-2018 at 09:25 PM..
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Old 05-15-2018, 04:54 PM   #5
polaris
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I believe you are looking at the wrong set of numbers. It should be the number cast onto the block and the next 4 digits.

This is the B20F engine off my 75 242: 498191

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