MINI2

25inprogress · Sep 17th, 2007, 08:52 AM

Hi there sorry if i have got this in the wrong section, i am looking into supercharging my engine on my rover 25, i know you probably get this quite alot, but could someone tell me what boost the standard mini cooper s is running? and also what size pulley is on the crank and also on the supercharger. also i have read on this forum about different size pulleys on the charger, what boost do these make the charger run at.
thanks for any information.

MiniPetrolHead · Sep 17th, 2007, 09:42 AM

Not to sure about the boost situation but the rover 25 has been known to have head gasket problems so if you do supercharge it make sure your running on a low boost so you dont get such problems or even worse melting a piston.

Why not attempt putting a Mini cooperS lump in your 25 that way the intenals are set up to take the stick from the supercharger, plus you could then put a smaller pulley on it and wack the boost right up!!!!

Alex

25inprogress · Sep 17th, 2007, 10:36 AM

i know about the head gasket problems but i know of a 1.4 zr that got turbo'd running 160bhp @ 4psi and thats been going strong for a few years now.
the main reason that head gaskets go on rovers/mg's is that people dint let them warm up properly.
as for the idea of sticking a mini engine in it, that could be good, but if i was to stick a new engine in then it would be the t16 out of the old rover coupes (2litre turbo) as thats pretty much a straight swap, so i could do that myself

any more info anyone might have to help me with supercharging it would be greatly appreciated

Richard Crofts · Sep 17th, 2007, 11:50 AM

The charger on the MINI is the Eaton 45 supercharger. As for a mm measure of the pulley I can't say but boost on a 15% reduction pulley weighs in at around the 15 psi mark i believe from the tests I have seen and boost guage readings in the past. Peaks of 20+ psi have been seen from -17% reduced pulleys some with +1 over sized cranks and some without. It is common for 17% or equivilant cars to peak over 18psi with ease (this is known even without guages because of the traction or DSC switching off at high boost)

Thats a lot of boost for a K series engines internals to stick. Even with a stock pulley the boost is probably going to be more than the internals of a 1.4-1.8 K series can stand. I should know I have blown 2 of them up!

25inprogress · Sep 17th, 2007, 12:06 PM

o joy, was only looking at running about 4-6psi tops.
could i stick a bigger pulley onto the charger to reduce the boost, or maybe get a recirculating dumpvalve and have that so it reduces the boost down to 4psi???

chuntington101 · Sep 18th, 2007, 06:20 AM

Quote: Originally Posted by 25inprogress (original)

o joy, was only looking at running about 4-6psi tops.
could i stick a bigger pulley onto the charger to reduce the boost, or maybe get a recirculating dumpvalve and have that so it reduces the boost down to 4psi???

use bigger supercharger pulleys mate. easier than spinning the blower faster and then bleeding the boost off. if the bleed fails then you could have big boost spikes that could total the engine!

are you keeping stock comp. ratio or dropping it?? if you are how are you going to do it?? also are you still going to run some kind of intercooling??

thanks Chris.

PS intresting project!

chuntington101 · Sep 18th, 2007, 06:22 AM

25inprogress, for got to ask where your are form? if in the UK then there is a mag called Practial Performance Car. good mag and this month has a BMW using a MINI blower. worht a look!

also i have seen a K-Series Lotus using one of these blower to i think.

Chris.

Richard Crofts · Sep 18th, 2007, 08:13 AM

I have heard of an original K series (1.8) elise with a blower too. I imagaine though it was not a bolt on mod.

The K could handle it but would have to either run large pulley to reduce boost a fair amount or some engine internals upgrading would need to be done. Some K series can throw big power but most just go bang....like I said I know this from experience!

chuntington101 · Sep 18th, 2007, 11:20 AM

Quote: Originally Posted by Richard Crofts (original)

I have heard of an original K series (1.8) elise with a blower too. I imagaine though it was not a bolt on mod.

The K could handle it but would have to either run large pulley to reduce boost a fair amount or some engine internals upgrading would need to be done. Some K series can throw big power but most just go bang....like I said I know this from experience!

think it was a built motor mate. work a treat but they found it hard to cool the intake charge down. that BMW is well worth a look in PPC mag. really nice conversion and good power form a stock motor!

thanks Chris.

MINI-Morgan · Sep 18th, 2007, 01:22 PM

This could be an interesting project then! Only issue I see is that you will need to produce more HP to turn the supercharger so if its blowing head gaskets at the moment then with an extra 50hp.... Uh Oh!

Richard Crofts · Sep 18th, 2007, 01:39 PM

I think his isn't but there were many K series that have. Particularaly there was an issue with the 1.8 engines. The 1.4 seams to have done better over the years with less HG failures than I have heard of on 1.8s

MINIMANIAUK · Sep 18th, 2007, 04:25 PM

The supercharger does not make boost,it only pumps air,the boost will be dependent on the flow of your engine,so it is not possible to predict either pulley size or boost output accurately.
First calculate what flow you require ie power level ,then what size your intake valves are as this will be the limiting factor.
Then look at the flow and rpm that the eaton provides and calculate from your max red line what ratio you need for the charger.It will be a lot of work ......and costly
fudging with cylinder head gaskets never works,low comp pistons made is the answer that will allow higher boost levels ,cam profile will then need to be looked at to one more charger friendly
then the exhaust system to cope with greater airflow,then the intake system,then fuelling and mapping as the present system has no recognision of positive pressure.
you really must love your car!!!

chuntington101 · Sep 19th, 2007, 06:21 AM

if your only running low boost and there are other people doing it then go for it! get a decent head gasket put on and make sure everything is flat. as long as you built a K-series right they can hold together. its just rover couldn't be ars*d to att he factory.

mild boost aplications are fine even with high compresion, just watch for dept!!!!

Chris.

Sep 17th, 2007, 08:52 AM	#1
25inprogress MINI2 Newbie Join Date: Sep 2007 Local Time: 08:29 AM Posts: 3 Offline	supercharger Hi there sorry if i have got this in the wrong section, i am looking into supercharging my engine on my rover 25, i know you probably get this quite alot, but could someone tell me what boost the standard mini cooper s is running? and also what size pulley is on the crank and also on the supercharger. also i have read on this forum about different size pulleys on the charger, what boost do these make the charger run at. thanks for any information.

Sep 18th, 2007, 01:22 PM	#10 (permalink)
MINI-Morgan MINI Obsessed... My Classifieds Join Date: Nov 2003 Location: Southampton, Hants Local Time: 08:29 AM Posts: 2,765 Offline	This could be an interesting project then! Only issue I see is that you will need to produce more HP to turn the supercharger so if its blowing head gaskets at the moment then with an extra 50hp.... Uh Oh! One Man, One Project......find out what happens next at MINIProject.co.uk For MINIs in the south it can only be South Coast New MINI Club

Sep 18th, 2007, 04:25 PM	#12 (permalink)
MINIMANIAUK MINI2 Sponsor Join Date: Mar 2006 Local Time: 08:29 AM Posts: 1,007 Offline	The supercharger does not make boost,it only pumps air,the boost will be dependent on the flow of your engine,so it is not possible to predict either pulley size or boost output accurately. First calculate what flow you require ie power level ,then what size your intake valves are as this will be the limiting factor. Then look at the flow and rpm that the eaton provides and calculate from your max red line what ratio you need for the charger.It will be a lot of work ......and costly fudging with cylinder head gaskets never works,low comp pistons made is the answer that will allow higher boost levels ,cam profile will then need to be looked at to one more charger friendly then the exhaust system to cope with greater airflow,then the intake system,then fuelling and mapping as the present system has no recognision of positive pressure. you really must love your car!!! www.minimaniauk.com

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Sep 17th, 2007, 09:42 AM	#2 (permalink)
MiniPetrolHead Banned My Classifieds Join Date: Oct 2006 Location: Eastbourne E.Sussex Local Time: 08:29 AM Posts: 702 Offline	Not to sure about the boost situation but the rover 25 has been known to have head gasket problems so if you do supercharge it make sure your running on a low boost so you dont get such problems or even worse melting a piston. Why not attempt putting a Mini cooperS lump in your 25 that way the intenals are set up to take the stick from the supercharger, plus you could then put a smaller pulley on it and wack the boost right up!!!! Alex

Sep 17th, 2007, 10:36 AM	#3 (permalink)
25inprogress MINI2 Newbie Join Date: Sep 2007 Local Time: 08:29 AM Posts: 3 Offline	i know about the head gasket problems but i know of a 1.4 zr that got turbo'd running 160bhp @ 4psi and thats been going strong for a few years now. the main reason that head gaskets go on rovers/mg's is that people dint let them warm up properly. as for the idea of sticking a mini engine in it, that could be good, but if i was to stick a new engine in then it would be the t16 out of the old rover coupes (2litre turbo) as thats pretty much a straight swap, so i could do that myself any more info anyone might have to help me with supercharging it would be greatly appreciated

Sep 17th, 2007, 11:50 AM	#4 (permalink)
Richard Crofts THE STICK Join Date: Feb 2003 Location: Worcestershire WR15 Local Time: 08:29 AM Posts: 3,000 Offline	The charger on the MINI is the Eaton 45 supercharger. As for a mm measure of the pulley I can't say but boost on a 15% reduction pulley weighs in at around the 15 psi mark i believe from the tests I have seen and boost guage readings in the past. Peaks of 20+ psi have been seen from -17% reduced pulleys some with +1 over sized cranks and some without. It is common for 17% or equivilant cars to peak over 18psi with ease (this is known even without guages because of the traction or DSC switching off at high boost) Thats a lot of boost for a K series engines internals to stick. Even with a stock pulley the boost is probably going to be more than the internals of a 1.4-1.8 K series can stand. I should know I have blown 2 of them up!

Sep 17th, 2007, 12:06 PM	#5 (permalink)
25inprogress MINI2 Newbie Join Date: Sep 2007 Local Time: 08:29 AM Posts: 3 Offline	o joy, was only looking at running about 4-6psi tops. could i stick a bigger pulley onto the charger to reduce the boost, or maybe get a recirculating dumpvalve and have that so it reduces the boost down to 4psi???

Sep 18th, 2007, 06:20 AM	#6 (permalink)
chuntington101 MINI2 Regular Join Date: Jul 2007 Local Time: 08:29 AM Posts: 116 Offline	Quote: Originally Posted by 25inprogress (original) o joy, was only looking at running about 4-6psi tops. could i stick a bigger pulley onto the charger to reduce the boost, or maybe get a recirculating dumpvalve and have that so it reduces the boost down to 4psi??? use bigger supercharger pulleys mate. easier than spinning the blower faster and then bleeding the boost off. if the bleed fails then you could have big boost spikes that could total the engine! are you keeping stock comp. ratio or dropping it?? if you are how are you going to do it?? also are you still going to run some kind of intercooling?? thanks Chris. PS intresting project!

Sep 18th, 2007, 06:22 AM	#7 (permalink)
chuntington101 MINI2 Regular Join Date: Jul 2007 Local Time: 08:29 AM Posts: 116 Offline	25inprogress, for got to ask where your are form? if in the UK then there is a mag called Practial Performance Car. good mag and this month has a BMW using a MINI blower. worht a look! also i have seen a K-Series Lotus using one of these blower to i think. Chris.

Sep 18th, 2007, 08:13 AM	#8 (permalink)
Richard Crofts THE STICK Join Date: Feb 2003 Location: Worcestershire WR15 Local Time: 08:29 AM Posts: 3,000 Offline	I have heard of an original K series (1.8) elise with a blower too. I imagaine though it was not a bolt on mod. The K could handle it but would have to either run large pulley to reduce boost a fair amount or some engine internals upgrading would need to be done. Some K series can throw big power but most just go bang....like I said I know this from experience!

Sep 18th, 2007, 11:20 AM	#9 (permalink)
chuntington101 MINI2 Regular Join Date: Jul 2007 Local Time: 08:29 AM Posts: 116 Offline	Quote: Originally Posted by Richard Crofts (original) I have heard of an original K series (1.8) elise with a blower too. I imagaine though it was not a bolt on mod. The K could handle it but would have to either run large pulley to reduce boost a fair amount or some engine internals upgrading would need to be done. Some K series can throw big power but most just go bang....like I said I know this from experience! think it was a built motor mate. work a treat but they found it hard to cool the intake charge down. that BMW is well worth a look in PPC mag. really nice conversion and good power form a stock motor! thanks Chris.

Sep 18th, 2007, 01:39 PM	#11 (permalink)
Richard Crofts THE STICK Join Date: Feb 2003 Location: Worcestershire WR15 Local Time: 08:29 AM Posts: 3,000 Offline	I think his isn't but there were many K series that have. Particularaly there was an issue with the 1.8 engines. The 1.4 seams to have done better over the years with less HG failures than I have heard of on 1.8s

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Sep 19th, 2007, 06:21 AM	#13 (permalink)
chuntington101 MINI2 Regular Join Date: Jul 2007 Local Time: 08:29 AM Posts: 116 Offline	if your only running low boost and there are other people doing it then go for it! get a decent head gasket put on and make sure everything is flat. as long as you built a K-series right they can hold together. its just rover couldn't be ars*d to att he factory. mild boost aplications are fine even with high compresion, just watch for dept!!!! Chris.