What did I just buy??

shifty6d · Samba Member Joined: November 24, 2005 Posts: 93

Picked up a pile of VW parts yesterday. I was mainly interested in the exhaust and a pair of carbs in the lot, but it was one of those all or nothing deals. Anyway, it came with a long block that I'm trying to figure out, I just split the case and the crank is counterbalanced and 8 pinned but I don't know what the markings mean or the rods are, the case halves and rod ends have been clearanced so I'm assuming it's restroked.

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I get that it's machined .020 but a 76 stroke, or?

Thanks for any help/input.

66brm · Posted: Mon Aug 24, 2015 7:22 pm Post subject:

76mm stroke, reground .020 under mains with Rabbit rods, it was an old school way of creating a stroker cheaply
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Dan Ruddock · Posted: Mon Aug 24, 2015 7:24 pm Post subject:

I think it is a rabbit rod 76mm crank. Turned out to be not such a good idea. They tended to pound out the center main in short order. The crank also tended to crack and break.

Remove a rod and mic the journal to confirm. Shoud be in the 1.800 range.

shifty6d · Samba Member Joined: November 24, 2005 Posts: 93

So it was a bad stroke length then? I thought 76mm didn't sound familiar.

GTV · Posted: Mon Aug 24, 2015 8:06 pm Post subject:

Dan Ruddock · Posted: Mon Aug 24, 2015 8:09 pm Post subject:

The stroke length was not the problem but the small rod journal cut out most of the cranks overlap between the rod and main journal weakening the crank.

Limit it to 5k rpm if you want to use it and make sure it is not cracked.

Dan

modok · Posted: Mon Aug 24, 2015 8:19 pm Post subject:

Wow, you guys are sharp!
yeah, rabbit rods.

shifty6d · Samba Member Joined: November 24, 2005 Posts: 93

The case looks cut for bigger barrels too and it's Brazillian (single relief). Isn't starting to sound like a good choice for a builder.

These heads were in the deal too:

Oops upside down, sorry

The diameter of the head machining doesn't match the machined diameter of the case though.

modok · Posted: Mon Aug 24, 2015 10:39 pm Post subject:

looks like eepco heads, cut for 94's
Really made in USA, unfortunately, there isn't anything particularly good about them.

Howard 111 · Posted: Mon Aug 24, 2015 11:29 pm Post subject:

My guess is you just bought someone's spare parts, soon to be your spare parts.
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FreeBug · Posted: Tue Aug 25, 2015 2:52 am Post subject:

The heads look semi-hemi'd, too.

vwracerdave · Posted: Tue Aug 25, 2015 4:48 am Post subject:

It would make a good engine for a play Buggy or sandrail to goof around in. Put it all together cheaply as possible and keep it under 5000 RPM's and it will last a while playing in the sand.
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vwinnovator · Posted: Tue Aug 25, 2015 4:50 am Post subject:

good for your boat as well Wink

shifty6d · Samba Member Joined: November 24, 2005 Posts: 93

Thanks for the replies, I'm gonna end up passing these along. The exhaust and the Dellortos were was I was really after in the deal like I said. They're too much carb for the engine I just built and was hoping these items were a good start on a bigger one, oh well.


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