mistergrumpy
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| posted on 26/2/08 at 10:31 PM |
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V 6/8 BEC
Got thinking about this last night after doing the head gasket on my ZX9 (how easy was that, much better than a car one) Not going too deep but I dug
out Malcs avatar from Yorkshire engines and had a look at it. To me that is art not some poo overpriced picture by some jumped up so and so but
anyways, without getting too deep into the nightmare I just wondered how it could be done (not that I'm doing it mind) Is it just a V crankcase
with 2 engine blocks and heads on? What about the gaskets and differing con rod lengths? Would these be custom made and therefore cost arms and legs?
Just trying to get my head round it all.
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roadrunner
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| posted on 26/2/08 at 10:34 PM |
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I think the v8 in the new Caterham as a bare engine cost £25000 GULP.
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jambojeef
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| posted on 26/2/08 at 10:42 PM |
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http://www.powertecracing.com/pdf_downloads/v8engine.pdf
Some bedtime reading!
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mistergrumpy
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| posted on 26/2/08 at 10:56 PM |
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Yep thems the ones. £22,000!! Build your own car for £22,250 .....and race it! Stunning piece of engineering though. Sometimes a bit sad I moved
out of engineering for a living, would love to be involved in summat like that.
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DIY Si
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| posted on 26/2/08 at 11:05 PM |
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As long as you can use the bike head, the rest is of relative ease. Not saying it's easy, but easier than starting from scratch as you now have
known bore spacings and so on. The crank would be expensive, but not overly complex, you may even be able to use a version of the manufactures middle
block part with the bores/sleeves in, and then just need a lower crank part of the block. So simple really, should only take a long weekend......
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mistergrumpy
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| posted on 26/2/08 at 11:12 PM |
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Aye I know what you mean. A simple look through a few engine specs and you should be able to piece summat together eh. In theory it don't sound
too painful but I bet it could cause more than a few sleepless nights. 
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DIY Si
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| posted on 26/2/08 at 11:25 PM |
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One head ache would be the alignment of the heads, as oen would be inside out, as it were, with the inlet/exhaust the wrong way round. Turning it
round and using different/billet cams with the drive cogs on the other end should sort that out though. However, as you say, it sounds like a fairly
logical process, but I can guarantee it wouldn't be! The block should be too much bother, you could even build it in layers, ala the K series.
Oiling systems shouldn't be too hard, just dry sump it.....
Arrrggghhhh, I'm not going to be able to think of anything else for a fair while now! Damn you.
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nitram38
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| posted on 27/2/08 at 12:09 AM |
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You have to be a precision engineer to get the tolerences right.
Ok in theory but a right pain in practice.
Easier and cheaper for the "amateur" to just use two engines.
Ask Russ Bost!
[Edited on 27/2/2008 by nitram38]
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worX
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| posted on 27/2/08 at 12:15 AM |
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There is a company doing a cheaper version of the powertec one I believe. (I think you may even be able to build it up as a part kit???)
Or you could give Malc a call as a mate of his is building up his own version too!
Steve
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chunkytfg
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| posted on 27/2/08 at 02:53 AM |
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quote:
Originally posted by DIY Si
One head ache would be the alignment of the heads, as oen would be inside out, as it were, with the inlet/exhaust the wrong way round. Turning it
round and using different/billet cams with the drive cogs on the other end should sort that out though. However, as you say, it sounds like a fairly
logical process, but I can guarantee it wouldn't be! The block should be too much bother, you could even build it in layers, ala the K series.
Oiling systems shouldn't be too hard, just dry sump it.....
Arrrggghhhh, I'm not going to be able to think of anything else for a fair while now! Damn you.
Not necessarily If you used a Bike engine that had two horizontally opposed heads then just engineered a block to take it from a boxer 6 to a V6 and
away you go. Possibly even be able to use the original crank aswell(he says just imagining things are probably easier in my head than reality bearing
in mind my head donesnt have a clue ) ?
Goldwing engine!!!
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02GF74
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| posted on 27/2/08 at 09:57 AM |
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It is not that impossible for someone at home to do it with the right sort of machinery.
z1300 V12
somewhere else you can get to the builder's site that explains a bit more how it was done.
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