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Bike enginesBenzBoy
@benzboy
Club Retro Rides Member 7
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OK lads and lasses, it is one of our favourite subjects of late! ;D But, when building them in my head (as you do  ) a few things trouble me... Bike engines are really powerful, we all know that, plus they redline at 10,000 rpm. Cool. If it's strapped to 400kg of bike. In a car weighing 800kg it's a bit of a different story. Torque becomes more of an issue than top-end power in order to get that extra weight shifting, and x amount of BHP at 9000 rpm is worth naff all.  A bit like putting a rally-spec Subaru WRX lump in an 18-wheeler - it might have masses of power but it'd do curse word all in a truck ;D I would suppose that when transplanting a bike lump, some tuning needs to occur . Either that or unbolt absolutely everything bar the seat, shell and wheels and lob it into the nearest skip! Also, are chain-drives normally kept? Call me a luddite but I prefer a nice propshaft! ;D Just trying to get it straight in my head really - not in any position to undertake another project but....for future reference..... ;D. Any info, links, etc gratefully received!  |
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Nathan
Club Retro Rides Member
Posts: 5,626
Club RR Member Number: 1
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Bike enginesNathan
@bgtmidget7476
Club Retro Rides Member 1
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Z-cars do that though, OK they use a Small car I.E mini as a start rip it to bits and wak the engine in,
Reckon they should develop car engines more to be able to rev to that amount and be 2litre bit like the s2000
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Well, if you don't think one bike engien will do a lot in a heavy car, why not have two...........  |
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 I like long walks, especially when they're taken by people I don't like. |
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greaz1989
Part of things
retro-rides best thing since sliced bread
Posts: 232
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the torque is a problem from what i know bikes have barely any torque so id guess the car would have to be pretty light
theres a mini in one of my brothers mini mags this month it runs a hyabusa engine and can do 0-60 in 3.8 seconds it still uses a chain to drive the wheels
on the other end of the scale what about lorry powerd cars ? that be somethig to see
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diffrent taste in cars than most people my age - is that a good thing........
YES!
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slater
Club Retro Rides Member
Posts: 6,390
Club RR Member Number: 78
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Bike enginesslater
@slater
Club Retro Rides Member 78
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Basicly a bike engine transplant will only relly work well in a light weight car. (minis, fiat 500etc.) IMO They simply don't have to toque to pull a larger car. You can tune it but it will still be a bike engine with bike engine chariteristics. Most converions retain the chain drive which is ok for occasional use. (replace every 1000miles, oil every time you use it) The one huge problem with a bike engined car for use on the road is the clutch. Its simply not designed to pull a cars weight and its going to be hella snappy and impossible to drive on a daily basis. One for track days/one off road use only relly |
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Bike enginesBenzBoy
@benzboy
Club Retro Rides Member 7
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what about lorry powerd cars ? that be somethig to see How crazy would that be?! ;D ;D. Fiat 126 with Cummins Diesel engine! ;D ;D ;D ;D |
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Now then. Having had a bike engined car, I finally can offer some proper help on here. The deal with the torque is that you have wheels that are half the size of bike ones and gearing such that you effectively double or triple the torque of the engine. I had a 'blade engined striker (pictures here) that was converted by me and a friend from a smoky 1.3 crossflow. We did what is now the accepted norm which is to mount the engine at the front of the car but 90deg round from how it is normally fitted, so that it runs longitudinally as opposed to the bikes transverse mounting. Instead of having a sprocket on the output it had a flange bolted into place and was attached to a diff via a two piece prop running a centre bearing. The diff was a 3.54 ford item. With the step down gearing inside the engine, and the 3.54 diff and 185x65x13 wheels it was geared for about 10mph per 1000rpm in top. So a theoretical top speed of 125mph. In fact it ran out of steam at about 117 and got a little skittish in the sidewinds. There is nothing to stop you changing the rear diff to something even more extreme and having the R1 unit in there that runs to much higher rpm, but you’ll be changing gears all the time and have a lower top end… For the gear change the best that I have seen is the push pull wire that some are using now. I think that it was used on the clutch pedal on the jag 220, but only costs 20£/metre, rigged up to a paddle behind the wheel set up. The best places to look at are z-carsyahoo BEC groupcomprehensive but blurry |
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Yesterday at 7:54, pogweasel wrote:
Nothing wrong with creature comforts. If I want masochism, I'll just go and slam my knackers in the fridge door for a bit.
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greaz1989
Part of things
retro-rides best thing since sliced bread
Posts: 232
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it does only seem to be kit cars running bike engine which is probably a good thing but small cars can benifit from the transplants from what ive seen
a cummins powerd 126 the cars about the size of the engine that would be nuts ;D
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diffrent taste in cars than most people my age - is that a good thing........
YES!
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not unless its a gold wing and youve ate all the pies
most bikes 120-250 kgs range for road bikes
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2001 HONDA CT110 (NOT RCV)
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Nick
Posted a lot
Posts: 2,483
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all I'm gona say is, 2engines sounds fun but its just gona end up in hassle and more weight and the drag factor unless its setup all perfick.
just use one bike engine and do it right,
i guess you've all seen the mk2 escort powered by honda cbr900rr engine, still pretty darn fast.
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idea stolen from rattely eddie.
this weeks car count "5"
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Bike enginesBenzBoy
@benzboy
Club Retro Rides Member 7
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not unless its a gold wing and youve ate all the pies most bikes 120-250 kgs range for road bikes Hehe, thanks for the correction - does it show that I know nob-all about bikes?! ;D |
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Has anyone seen the V8 engines being developed using Motorbike heads with custom crank and block - the result is a super compact + light engine of around 2 litres producing around 350bhp IIRC + alot more torque than from a 4 pot bike engine..... not bad for a N/A engine  |
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mercmad
Posted a lot
Flush Hard,it's a long way to McDonalds.
Posts: 1,740
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Aussie cars,Bike powered replicas of Aussie cars,holdens,falcons etc,these things started off as copies of those mini dirt track cars in the states but eneded up being miles better and faster around a race track than a V8 "supercar".  they handle better than go carts because they have proper suspension and the engines are all controlled to keep the cost down and the racing close, www.aussieracingcars.com.au/album/thumbnails.php?album=25 |
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Many years ago I changed my driving style to cope with rising fuel prices; I have now reached the stage where I am contemplating keeping my eyes shut in order to lower wind resistance.
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The big Suzuki engines are the torquiest bike engines, but you do lose some revs (max out at about 10500rpm). BadgerBill is right, bikes generally have a step down of about 1.5:1. Its easier to keep the chain unless it is a shaft drive bike ;D. If you want anymore help then visit www.locostbuilders.co.uk. They have a section just on BECs and it is not only about Locosts anymore. Adam |
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1997 TVR Chimaera
2009 Westfield Megabusa
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) a few things trouble me...
