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How big is a standard pulley? Contact Carl at www.Force-racing.co.uk, he should be able to turn a belt grove down in a standard pulley. He made me a custom pulley for my supercharger. Bear in mind, if you are using an E45 charger in suck through form, between 7 and 12psi+ all you get is more heat as it's hugely inefficient and you end up with next to no gain for the extra 8psi (in your case). |
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no no no, just go here - www.transdev.co.ukThe pullies for my blower were about £10 each  J |
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10psi is what all the mini supercharger kits seem to run as standard so i think that figure will be ok as it seems a tried and tested route. Probably not hugely effecient as you say but seems to work.
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no no no, just go here - www.transdev.co.ukThe pullies for my blower were about £10 each J Did they make your crank pulley too? |
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Just bought it off the shelf there, had it machined by a local engineering company for about £25, to bolt onto the centre of a stock crank pulley.
J
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no the eaton chargers run 8 psi standard. i was running 10psi on mine. i bought a smaller charger pulley which cost £70. anything over 10psi is no good. its the chargers they just arnt built for high boost. at 10psi on my 1380 i was running 150bhp......
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realistically i think i will get about 80bhp out of the little 998, hopefully with more work and development time on it i will be able to reach the 100 mark, that is my ultimate goal at the moment.
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A Chap with a standard 998 got 62bhp out of his with an SC12 charger running 7psi. With a well worked 12G295 head he got closer to 80.
Don't forget the A series engines have a harmonic damper in the crank pulley so you can't just whack another plane pulley on it, you end up shaking your bottom end to bits. Hence my advice to get a standard one modified.
An additional bolt on pulley won't work as the 80mm one will be smaller than a standard pulley and the M45 kits are designed to run the belt from there, so having it face a different direction is out.
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craig1010cc
Club Retro Rides Member
Posts: 2,993
Club RR Member Number: 35
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What about looking at the crank pulley from a MPI mini?
Plus (I think) only the later A series bottom pulleys where damped.
From the experience that a couple of mates had with theirs (1 998 and 1 1310), carb icing is a real problem (the pipe to the blower get frost on it) so you wany to look at either water heating that pipe or a electric heater eliment in the air filter to warm the air.
Personally, I would front mount the blower and force feed a metro turbo carb in its normal position. should be easier space wise in a 'tro.
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The MPi pulley doesn't have the single V pulley, so you need to sort out something for your alternator and water pump pulley.
Harmonic dampers where on most A+ engines, certainly the metro engines.
Carb icing is a problem as the carb is miles away from the charger.
Blow through supercharging isn't that simple, you need to do some form of re-circ system as the charger is still pumping air into the carb even though the butterfly is closed. There's a chap with a 1275 engine with blow through M45, does about 160BHP.
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DutyFreeSaviour
Europe
Back For More heartbreak and disappointment.....
Posts: 2,944
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All good advice fella - but get yourself over to turbominis.co.uk and do some reading. Loads of builds on there with superchargers etc.. too. I've 'lost' hours on there regularly. They also give fairly honest reviews of traders/experts for bits or work. Get readin' |
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Back from the dead..... kind of
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thanks guys, With regards to the harmonic balancers how come so many people run the billet bottom pulleys with no problems on most supercharger conversions? I think ive found somebody who will make me a custom 1 piece pulley that will do what i want for a reasonable price. I didnt think such an early and small engine would have a harmonic damper?
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You might just find me on turbominis too, with my clubman that will one day be supercharged and my turboed metro van.
The harmonic dampers are there to remove resonating vibration (wrong words...) at certain RPM. Remove the harmonics and eventually your bottom end will shake itself to bits.
A lot of people are replicating the original vmax kit and try and do it cheaper. Chances are they use the none harmonic pulley. buyer beware, they are spinning time bombs...
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The original vmax kit doesnt use a harmonic balancer though does it? Ive been in talks with them about a pulley being made to the size i need.
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The way I see it is that BL (austin, rover etc etc) didn't develop anything they didn't need to. So if they went to the effort of the harmonic damper in the pulley, then it's there for a reason. Then add in twice the factory power and what do you think the likely result could be?
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yeah i totally understand that, but to be honest I'm not expecting it to last long its going to be a highely tuned 998. Good thing is the 998s are 10 a penny because everybody wants the 1275s
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I have a jackson racing eaton 45 on my zetec mondeo (not very retro yet) with a larger crank pulley and a smaller charger pulley which produces 10 ~ 11 psi at the redline. iirc it spins the charger at somewhere around 15k rpm which is about the limit of the charger, any faster then it becomes inefficient. heat is a problem and due to the way it fits to the manifold it cant be intercooled (easily) . I have fitted water / methanol injection to help combat this which is a help in the warmer months. heres a pic of my set up. I have since relocated the battery to the rear and fitted a cold air feed from the headlight to the cone..   |
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Why mess with blowing an a series when for less ££ you can drop in a k series and have more power and 5 speeds?
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Koos
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because i don't want to be the same as everybody else  i would rather have a charged a series. That is far far cooler than any k series to me. |
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i would rather have a charged a series. That is far far cooler than any k series to me.