undecided
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| posted on 30/7/04 at 10:26 PM |
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It will cost you more than 15 grand to make a v8 yourself that works so why bother
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JoelP
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| posted on 30/7/04 at 10:45 PM |
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[chong]
for the ride, man!
[/chong]
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tks
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| posted on 31/7/04 at 03:23 PM |
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Engine building...
I think its possible to do it..
but not in the way you want to
I think you can't put all that power on the normal clutch/gear box.
to make a 8 cylinder i wouldn't place it in V vorm i would just put it in line...
Bike engines are short..soow i think it could fit..
but then you have the problem of the clutch and then the gearbox.
I think the project after allot of money will work..!!
and the car will run but it will no be practical because of the replacement of allot of components or you should also invest moeny in that
part...etc...
if you want 2 engines i suggest just put 2 unther the bonnet connect both whit a chain.
double all the things..clutch, gas, gear..
and go in that way.. you could use one way bearings to overcome rotation speed problems.. (if they resist the power..)
TKS
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Wadders
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| posted on 31/7/04 at 03:48 PM |
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Thats it! 2 V-Max engines, joined in line, 280hp and 140ft/lb of torque mmmmmh
i]Originally posted by tks
to make a 8 cylinder i wouldn't place it in V vorm i would just put it in line...
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crbrlfrost
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| posted on 1/8/04 at 03:06 AM |
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Wow, definitely surrounded by optimists here aren't we? As we all know most great projects are not about the money but about the journey. Since
we're on the Locost forum, it certainly makes no sense to try to dissuade someone from building something. Besides, the primary component that
would need to be sent out is the crank. If he could do the block and send it out to be final machined, then build and intake and exhaust, it should be
to huge of an issue. Not to belittle thousands of man hours put into a new engine, even using some pre-existing components, but I'd never be the
one to knock someone for trying it. Cheers!
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NS Dev
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| posted on 1/8/04 at 09:16 PM |
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why bother joining the engines at the engine? Just jpin the transmissions (after the gearbox). IN autograss where you are all sick of hearing that I
race (!!!) They have been doing this for years!!!
Look at Chris Allanson's (Z-Cars) creations, like the twin engine Tiger's and Westfield's he has built, for less than is being
talked of for an engine!!!
I don't wholly agree with the idea of an engine foe the front and an engine for the back like his Tiger, but the Westfield used both engines to
drive a bespoke transfer box which drove the propshaft and was just rwd.
Loads and loads of twin Hayabusa/ZX9R/ZX12R/GSF1200/GSXR1100 cars in autograss class 10!!!
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JoelP
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| posted on 1/8/04 at 09:21 PM |
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the glory is in the struggle! the whole idea is, IMHO, to make a badass v8 on one crank! linking them end to end may have the same effect but it is
definately cheating! If you successfully make one of these real v8s, you would be a workshop hero of the first order.
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NS Dev
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| posted on 1/8/04 at 09:33 PM |
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yes, I know where you are coming from and I agree with that sort of thinking, but the machining required would make the engine more expensive than
almost any of the alternatives!
Nive to be able to say " I made that" though!!
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stephen_gusterson
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| posted on 1/8/04 at 09:33 PM |
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why build a V twin for a 3 wheeler when a honda CX500 engine is already that, AND has the convenience of shaft drive......
atb
steve
quote:
Originally posted by paulf
I once considered building a V twin to put in a morgan three wheeler replica and intended to either get the crankcase cast or fabricate it from plate
with bolts and dowels.and use 2CV barrels and heads.However never got around to it as I started building a seven instead, maybe it could be my next
big project.
Surely it would be easier to make a billet crankcase, it would be stronger lighter and more stable than a welded fabrication .A welded crankase would
also have to be very carefully stress relived and machined to avoid distortion, as the tolerances involved are a maximum run out on the main bearing
housings of half a thou.
Maybe a primary reduction gear could be used to drive a car gearbox as in bike engines.
Paul.
quote:
Originally posted by Bob C
For the custom crankcase I planned to fabricate from ally plates tig welded up - there's some history for this approach, in fact TVR used a
fabricated crancase in their recent V12.
Plus remember I'm just shooting the breeze for the next couple of years on this - IF it looks practical I'll start building in 2006!
cheers
Bob
PS I still can't see why a normal gearbox should'nt be run at 2x speed - nothing will break, the main worry is lubrication - will all the
oil get thrown off????
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liam.mccaffrey
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| posted on 1/8/04 at 10:14 PM |
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refering to the mention of the twin bike enginened tiger i think it was,
does anyone know why the bespoke transfer box costs £2500!
I have seen the pictures
it doesn't look that complicated unless the gears themselves are special?
as usual though i am happy to be proved wrong
P.S.
the idea of mating 2 bike engines into a v8 is a cracking fun idea, why the hell not so what about the expense let the people with the cash have a go
!
[Edited on 1/8/04 by liam.mccaffrey]
Build Blog
Build Photo Album
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paulf
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| posted on 1/8/04 at 10:28 PM |
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I never really liked the CX500 and wanted to have an aircooled engine to look more original, I could have used a Motoguzzi ,but the main reason was
to make it myself.I would have fitted it to a car gearbox.
Paul
I dont have as easy access to the required machinery now so will probably stick to building model engines.
Paul
quote:
Originally posted by stephen_gusterson
why build a V twin for a 3 wheeler when a honda CX500 engine is already that, AND has the convenience of shaft drive......
atb
steve
quote:
Originally posted by paulf
I once considered building a V twin to put in a morgan three wheeler replica and intended to either get the crankcase cast or fabricate it from plate
with bolts and dowels.and use 2CV barrels and heads.However never got around to it as I started building a seven instead, maybe it could be my next
big project.
Surely it would be easier to make a billet crankcase, it would be stronger lighter and more stable than a welded fabrication .A welded crankase would
also have to be very carefully stress relived and machined to avoid distortion, as the tolerances involved are a maximum run out on the main bearing
housings of half a thou.
Maybe a primary reduction gear could be used to drive a car gearbox as in bike engines.
Paul.
quote:
Originally posted by Bob C
For the custom crankcase I planned to fabricate from ally plates tig welded up - there's some history for this approach, in fact TVR used a
fabricated crancase in their recent V12.
Plus remember I'm just shooting the breeze for the next couple of years on this - IF it looks practical I'll start building in 2006!
cheers
Bob
PS I still can't see why a normal gearbox should'nt be run at 2x speed - nothing will break, the main worry is lubrication - will all the
oil get thrown off????
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bikkel
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| posted on 2/8/04 at 06:24 AM |
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hi
some guy in germany has done it:
look at :
v8 bike engine
thought that some mp3's are on his site
i hope you knowledge of german is good
koen
www.zx12r-indy.tk
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Noodle
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| posted on 2/8/04 at 06:58 AM |
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I've mentioned this before, but Hart made a V8 from two FZR1000 Exup motors a few years ago.
They displayed it at one years Autosport show. I know because I won a bag o' crap for being the first person to spot it for what it was.
Never saw it used anywhere though.
Cheers,
Neil.
Your sort make me sick
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Bob C
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| posted on 2/8/04 at 09:39 AM |
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cheers Koen - stacks on that german link (I understand a tiny bit..)
Everyone seems to use yam donors - wonder why..
Bob
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locost_bryan
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| posted on 3/8/04 at 01:01 AM |
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If John Britten could build this in his garage 15 years ago http://www.nzedge.com/heroes/britten.html  , the world's first
carbon-fibre motorcycle with a home-built stressed member V-twin  and p*ss all over Ducati at Daytona , then why can't you build your
own V-8?
[Edited on 3-8-04 by locost_bryan]
Bryan Miller
Auckland NZ
Bruce McLaren - "Where's my F1 car?"
John Cooper - "In that rack of tubes, son"
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crbrlfrost
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| posted on 3/8/04 at 04:34 PM |
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The yamaha motors are most likely used due to proven performance, the ability to have them in 5 valve if you wish and the center cam drive which makes
things a bit more convienent (Don't have to run a chain off both ends of the crank or, alternatively come up with a machining intensive front
cam adaptor for one head.) The block and crank are usually enough for people to worry about....not to mention intake, exhaust, ignition.....Cheers!
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