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Post by MiNiTiCi on Mar 17, 2005 16:32:27 GMT -5
I know that Rob has been stocking up with Eaton M45 ex-BMW MINI Cooper S superchargers and bits from e-Bay But has anyone any good tips on how to adapt them for use on the A-Series motors? For my proposed Mk5 sports racer Terrapin - a 998cc A-Series with supercharger would still be in the up to 1400cc Sports Libre class in hillclimbs & sprints (applying the 1.4 equivalence rule 998 = 1397.2cc). Doug.
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Post by BigMark on Mar 18, 2005 4:01:40 GMT -5
I'm really interested in this aswell. 1300cc, fully lightened balanced and supercharged gets me shaking just thinking about it. oh ROB...... sure he'll be along to educate soon ;D
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Post by Terrapin on Mar 18, 2005 8:15:14 GMT -5
Researching myself at the moment. As you will know there is a guy already selling kits. In essence I have gathered that the MPI manifold can be modified (but I will probably make my own once I find a suitable milling machine). Use the BMW pulleys and tensioners (mate crank pulley to mini pulley or make your own - don't ignore the damper!) Breather has to be removed from front timing chain cover - fouls belt. Ideally you need to lower the compression but this can be done by finding the right head! All bits squirreled away ready to play with when time permits. You just can't help but buy a new supercharger when they are running around the £100 area Mark, send you some photos for posting!
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Post by BigMark on Mar 18, 2005 10:48:34 GMT -5
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Post by BigMark on Mar 18, 2005 10:49:53 GMT -5
So if we need to have a low comp head for this would a standard MG leaded head and shallow dish pistons not be perfect?
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Post by MiNiTiCi on Mar 18, 2005 16:14:15 GMT -5
As I was thinking of using a small-bore (998cc), fitting a 12G940 head from a 1275 would probably reduce the compression to a suitable level. Rob, Do the Eaton superchargers use any form of external oil feed? Doug.
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Post by MiNiTiCi on Mar 28, 2005 15:35:22 GMT -5
More thoughts on the supercharger installation.. I think I will use HTD timing sprockets and toothed belt (as per the VMAX Scart setup) Hopefully this will reduce the tension in the belt compared to the original Cooper S grooved belt - this should save bearing wear. Having had a quick search on the net, there appears to be a lot of HTD part suppliers and manufacturers about. Interestingly, I came across www.paceproducts.co.uk which was founded by David Lazenby who designed the Hawke single seater race cars. Now I just need to figure out what sort of drive ratio I need (so that the head does not blow off at 8000 RPM ;D Doug.
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Post by Terrapin on Mar 29, 2005 5:24:56 GMT -5
Yes, it's a dilema. Polyvee are easy to make on the lathe (if you haver access to one) HTD's tend to be somewhat pricey
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Post by MiNiTiCi on Mar 29, 2005 12:10:53 GMT -5
Hi Rob, I take your point about being easier (cheaper) to turn multi-V belt pulleys. I presume that the standard Cooper S supercharger pulley is just a very tight fit on the shaft. Doug
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Post by Mr Locost on Apr 3, 2005 14:29:28 GMT -5
Interestingly, I came across www.paceproducts.co.uk which was founded by David Lazenby who designed the Hawke single seater race cars. The guy I bought the Locost off worked at Pace Products, and he kept it at their workshops. Their products seemed very high quality! Adam
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allan
New Member
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Post by allan on Apr 11, 2005 18:19:09 GMT -5
All the development of supercharged Mini engine with which I set 1100 class records at Elvington in 1969 is detailed in HSLC, and reproduced unaltered in 40 Anniversary edition. Somewhat remarkably, the car still holds three of those records. fMore to the point is that much of the blowing information is still relevant. In particular: use toothed belts, nothing else. Cool the charge if at all possible. Surprisingly high comp.ratio can be tolerated without trouble. (9 or 10:l) especially with current fuels and addititive as belt and braces. Hairy, race cams including the legendary BMC comps 649 also worked well. Note that toothed pulleys and belts also permit fairly easy experiment with engine/blower rpm ratio experiments, not so vital now that engine revs.have risen over the years.
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Post by MiNiTiCi on Apr 12, 2005 12:21:21 GMT -5
Hi Allan, Any thoughts on water injection for 'charge cooling'? At most speed events in Scotland we are not permitted to run Methanol therefore we cannot benefit from that useful 'charge cooling' effect. I am not totally certain that water injection is permitted but as it is neither a fuel or oxidant and I can't see anything in the MSA 'blue book' that would not allow its use. Doug
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gator
New Member
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Post by gator on Jul 11, 2005 7:44:11 GMT -5
In Oz 4age (1.2 litre per rev) or Supra 1gze (1.4 litre per rev) are cheap at around A$250. I use one on a 1300cc Sprite with 1 3/4 SU with water injection, for hillclimbs. No flash technology like helical rotors and intercoolers but cheap and plentiful.
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gator
New Member
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Post by gator on Jul 20, 2005 5:17:23 GMT -5
Further to the Eaton Pics...what are the two drive pulleys on the MINI Eaton pictured about. Most blowers incl eaton M45 have one drive pulley with the second driven by the internal gear (contra rotating). Not both driven in the same direction. Can anyone help me here?
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Post by MiNiTiCi on Jul 20, 2005 6:22:57 GMT -5
Further to the Eaton Pics...what are the two drive pulleys on the MINI Eaton pictured about. Most blowers incl eaton M45 have one drive pulley with the second driven by the internal gear (contra rotating). Not both driven in the same direction. Can anyone help me here? Hi Gator, The pulley closest to the engine is an idler pulley and does not drive anything internally to the supercharger. This idler appears to be there to provide the tensioner pully something to react against. Doug.
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