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1600cc to 1800cc upgrade
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redbuggy
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PostPosted: Mon Jul 25, 2016 10:23 pm    Post subject: 1600cc to 1800cc upgrade Reply with quote

Is the 1600 and 1800 casing interchangeable? I have a 1600 for a 71 super beetle and was wondering if I could upgrade it to a 1800 easily?
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Bama Dave
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PostPosted: Tue Jul 26, 2016 2:41 am    Post subject: Re: 1600cc to 1800cc upgrade Reply with quote

Depends on the definition of "easily." To get to 1800 exactly, you need a 74mm crank and 88mm pistons. The stock setup is 85.5mm pistons X 69mm crank. If you have no engine/mechanical experience, then maybe not easy. You can buy the "slip in" 88mm pistons to avoid machining the case, but machining of the heads (or new heads) is required. Alone, (with the head size increase and stock crank) the 88mm pistons get you to 1679, but to go larger, a complete tear down and build up is needed to put in a larger crankshaft. And once you tear it down, who knows what you will find. Likely you will need many other new parts to replace old, worn out ones. Not to mention that the case itself may need more work. Before you go any further read a bunch in the Engine forum, then check your budget, then decide which direction you want to go. If you have an expert in your area, talk to them for advice. Good luck.
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modok
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PostPosted: Tue Jul 26, 2016 2:44 am    Post subject: Re: 1600cc to 1800cc upgrade Reply with quote

If by 1800 you mean type-4, then, they are not any interchangeable parts, besides.....I can't think of any, well, it's 90% different.
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redbuggy
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PostPosted: Tue Jul 26, 2016 7:41 am    Post subject: Re: 1600cc to 1800cc upgrade Reply with quote

@bamadave The plan is to tear it all the way down and rebuild it I just wasn't sure if I would be able to keep the same casing and make it an 1800 by exactly that, replacing the heads and all other parts.
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Cusser
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PostPosted: Tue Jul 26, 2016 8:41 am    Post subject: Re: 1600cc to 1800cc upgrade Reply with quote

redbuggy wrote:
@bamadave The plan is to tear it all the way down and rebuild it I just wasn't sure if I would be able to keep the same casing and make it an 1800 by exactly that, replacing the heads and all other parts.


You could tear down the 1600cc engine, have the case and cylinder heads bored and make into larger 1776 or 1835cc engine relatively easily in terms of mechanical ability, like rebuilding a stock engine. Machining will cost some, larger pistons & cylinders will cost some, but you could stay same camshaft and carburetion if your budget had constraints. I would add a combination oil pump/filter though, like CB Maxi2.

Myself: I've run 1835cc engine for 4 decades now, stock camshaft, nothing special on heads, single Weber carb, Quiet exhaust, CB Maxi2. Like it.
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MConstable
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PostPosted: Tue Jul 26, 2016 10:54 am    Post subject: Re: 1600cc to 1800cc upgrade Reply with quote

http://www.aircooled.net/1800cc-vw-engine-no-machine-combo/


Great article...spells it out
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