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Author Subject: Bottom end modifcation help
hovis16

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Location: Reading/parts for sale

Registered: 21 Nov 2008

Posts: 4,306

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Post #1
Right a mate and I have got hold of a SPARE engine and fancy doing some work to it. Our funds aren't skyhigh for this reason we are thinking S16 pistons and a diesel crank to give us a little grunt. The thing is will we gain much by using 86mm pistons instead of 87mm? Also i no we would have to take a tad off the top off the pistons? If so how would we go about figuring out the cc of the bottom end so we know what cams to go for? Clear sheet and top up jobbie? Im up to date with rebuilding a standard engine but this is a tad different lol good learning curve I guess.

Any help and i'd be grateful

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Posted 7th Oct 2012 at 21:35
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pete_rallye

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Location: Yorkshire

Registered: 12 Dec 2002

Posts: 5,253

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Post #2
Basically you put the piston down in the bore so the top of the piston is flush with the deck of the block. Then you add fluid to the cylinder, measuring as you go with a syringe or burette or similar until the fluid is level with the deck of the block also. Then you work out what the volume of the cylinder would be if the piston were flat topped, and then deduct the cc of the fluid from that amount. Makes sense?! Would be well worth your while spending £15 on a decent book if you plan to start changing strokes and bores etc!

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Posted 7th Oct 2012 at 21:43
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hovis16

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Location: Reading/parts for sale

Registered: 21 Nov 2008

Posts: 4,306

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Post #3
Yes the makes sense indeed. Was just looking at a haynes book online. I remember davey having an interesting looking book

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EX black 6 owner
But now a Black caged rallye owner

Hunting for Go faster bits!


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Posted 7th Oct 2012 at 21:56
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bigbadbowen

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Location: Winchester

Registered: 21 Nov 2003

Posts: 13,753

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Post #4
I have a spare diesel crank bud Yes
Posted 7th Oct 2012 at 22:09
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hovis16

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Location: Reading/parts for sale

Registered: 21 Nov 2008

Posts: 4,306

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Post #5
Nice one how much you after??? Trade job service for crank Whistle

________________________________________

Ph2 Black GTI 6!

EX black 6 owner
But now a Black caged rallye owner

Hunting for Go faster bits!


SEARCH

click here
Posted 7th Oct 2012 at 22:17
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bigbadbowen

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Location: Winchester

Registered: 21 Nov 2003

Posts: 13,753

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Post #6
Sounds like a good deal to me bud Thumbs up
Posted 7th Oct 2012 at 22:27
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