Wtb 1(!) 87 mm cylinder

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Glauco
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Wtb 1(!) 87 mm cylinder

Post by Glauco » Sat Feb 20, 2016 2:21 am

Anyone who has a single 87mm cylinder for sale? Cracked on of mine..

Glauco

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ProctorSilex
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Re: Wtb 1(!) 87 mm cylinder

Post by ProctorSilex » Mon Feb 22, 2016 1:40 pm

How soon do you need it? I should have two good used ones in the US (I presume you are outside US). However, the earliest I will be getting to disassembling that engine is a few months from now. I do not recall the exact size. They are drop in larger than (but close to) 85.5mm cylinders.
By the way, I highly recommend against these as they are the main reason I have to tear this engine apart again! The thin walls dug into the head on one side. The other reason is that the cylinders on that same side are corroded. I could not replace them when I had the engine apart because I do not have spares in this size.

Glauco
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Re: Wtb 1(!) 87 mm cylinder

Post by Glauco » Wed Feb 24, 2016 5:43 am

ProctorSilex wrote:How soon do you need it? I should have two good used ones in the US (I presume you are outside US). However, the earliest I will be getting to disassembling that engine is a few months from now. I do not recall the exact size. They are drop in larger than (but close to) 85.5mm cylinders.
By the way, I highly recommend against these as they are the main reason I have to tear this engine apart again! The thin walls dug into the head on one side. The other reason is that the cylinders on that same side are corroded. I could not replace them when I had the engine apart because I do not have spares in this size.
I would need them sooner, I want to get the car on the road before summer starts..

Dupe
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Re: Wtb 1(!) 87 mm cylinder

Post by Dupe » Tue Oct 11, 2016 9:57 pm

I may have a new one in my shop thats been sitting the box for years. I'll mic it out and let you know.

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Marc
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Re: Wtb 1(!) 87 mm cylinder

Post by Marc » Tue Oct 11, 2016 11:18 pm

I know I have some...but this thread was started 8 months ago, I don't imagine he still needs one. :wink:

I've seen the "sinking in" problem with slip-in 88s, classic 92s, and old-school 90s but have run many, many 87s without that particular issue arising. They are, after all, only a couple thousandths thinner than 94s and you don't hear this complaint about those as a rule.

The genuine concern about them is that they are more susceptible to permanent damage from overheating - they'll hold up nearly as long as 85.5s if that never happens. A poor choice indeed for a heavy vehicle.
Consider that VW used to sell Factory Exchange engines that had 86.5mm bore, with a full warranty.

Nowadays, if I was looking for an easy way to boost the power of a stock-case engine I'd use the "slip-in thickwalls" from AA. They don't require any machine work to the case, just the heads, and have a generous wall thickness for good head seal and resistance to permanently distorting if overheated some. The 6% displacement increase is enough to feel, even with no other modifications; the 3½% you get from 87s, not so much.

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