Engine blew kinda sorta

940 Views 13 Replies 2 Participants Last post by mike1967, Mar 30, 2021

MunMun

Discussion Starter · Mar 29, 2021

Ok so the other night I was racing my newly rebuilt r53 and out of nowhere the belt shreds it’s self off the engine and when I go to check the oil to make sure I didn’t blow a piston there was coolant mixed in BUT the engine still had full compression and doesn’t knock so I’m almost positive it’s just a blown head gasket from getting too hot without a belt on the supercharger can someone correct me if I’m wrong please.

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MunMun

Discussion Starter · #2 · Mar 29, 2021

MunMun said:
Ok so the other night I was racing my newly rebuilt r53 and out of nowhere the belt shreds it’s self off the engine and when I go to check the oil to make sure I didn’t blow a piston there was coolant mixed in BUT the engine still had full compression and doesn’t knock so I’m almost positive it’s just a blown head gasket from getting too hot without a belt on the supercharger can someone correct me if I’m wrong please.

I’m running 15% supercharger pulley and a 2% overdrive pulley by the way and I used a stock cosmetic head gasket instead of the .25 like I should’ve and a cheap gates belt that fit the 17%

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mike1967

· #3 · Mar 29, 2021

first off gates belts are not cheap prob the best around,, in the beginning gates made conveyor belts for factorys and were the best around for many years as rarely failed, i've been using gates for timing belt kits for years and are best on market in my book and many other techs, but there are cheaper fake china ones around that are rubbish,,
as you have pushed more boost pressure through then engine guess you have had it mapped to suit the boost ie cant just add air and not fuel as they will lean out and over heat and blow them selves up at some point,,
if you have water in oil and oil in water would suspect the heat exchanger on the oil filter housing might of failed common thing, or the rubber seals from housing to block another area,,
most likely i would suspect over pressure for for head gasket and caused head lift likely ie pushed the head gasket out perhaps,
really should of been mapped and fueling changed to prevent lean outs and massive increases of pressure and heat when dont

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MunMun

Discussion Starter · #4 · Mar 29, 2021

I thought r53 couldn’t be mapped without sending out your ecm to some company though? At least that’s what I got from reading forums mostly

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mike1967

· #5 · Mar 29, 2021

MunMun said:
I thought r53 couldn’t be mapped without sending out your ecm to some company though? At least that’s what I got from reading forums mostly

i work at a garage with rolling road and can be live mapped from eobd socket in car,, ie copy the files off ecu then rewrite them and reload back in to ecu,, easy to do when have a few thousand pound map tools as mappers have,,
yes needs doing correctly or will just melt the engine down as running lean really hurts them a lot,,

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MunMun

Discussion Starter · #6 · Mar 29, 2021

mike1967 said:
i work at a garage with rolling road and can be live mapped from eobd socket in car,, ie copy the files off ecu then rewrite them and reload back in to ecu,, easy to do when have a few thousand pound map tools as mappers have,,
yes needs doing correctly or will just melt the engine down as running lean really hurts them a lot,,

Ok so correct me if I’m wrong but they can be mapped and tuned from a tuner ? So if I went to a local place that could plug into the obd2 they could run a proper map for me?

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mike1967

· #7 · Mar 29, 2021

MunMun said:
Ok so correct me if I’m wrong but they can be mapped and tuned from a tuner ? So if I went to a local place that could plug into the obd2 they could run a proper map for me?

yes they can mapped we do them all the time,, done a r53 on 2002 jcw that i fitted fast road cam and done the head on it and decat as well got 233bhp at wheels,, when adding smaller pulleys it increases the air molecule's so by adding longer or higher pressure fuel to add to the air ie the magic number is 14,1 ratio ie 14 parts air to 1 part fuel tends to eb the number for best power and safer power ie prevents the lean out,,

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mike1967

· #8 · Mar 29, 2021

failing that i know a guy in uk who can do mail order map on a ecu sent to him,, really is top guy,

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MunMun

Discussion Starter · #9 · Mar 29, 2021

mike1967 said:
yes they can mapped we do them all the time,, done a r53 on 2002 jcw that i fitted fast road cam and done the head on it and decat as well got 233bhp at wheels,, when adding smaller pulleys it increases the air molecule's so by adding longer or higher pressure fuel to add to the air ie the magic number is 14,1 ratio ie 14 parts air to 1 part fuel tends to eb the number for best power and safer power ie prevents the lean out,,

Alright well thank you for all the helpful info when I get the issues fixed I now know that I need it tuned and will do so as soon as it’s drivable again thank you

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mike1967

· #10 · Mar 29, 2021

MunMun said:
Alright well thank you for all the helpful info when I get the issues fixed I now know that I need it tuned and will do so as soon as it’s drivable again thank you

they go so well when mapped with smaller pulleys,,, also worth fitting a newman fast road cam link below

NEWMAN CAMS FOR Mini Cooper S R53 W11 01-06 Ph2 Fast Road Supercharged Camshaft | eBay

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then get mapper to increase the rev limiter by 500 revs on stock rods and pistons,,, we done one like that 2 years a go and that car is stiff going well now on a 110,000 miles engine

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MunMun

Discussion Starter · #11 · Mar 29, 2021

mike1967 said:
they go so well when mapped with smaller pulleys,,, also worth fitting a newman fast road cam link below

NEWMAN CAMS FOR Mini Cooper S R53 W11 01-06 Ph2 Fast Road Supercharged Camshaft | eBay

Find many great new & used options and get the best deals for NEWMAN CAMS FOR Mini Cooper S R53 W11 01-06 Ph2 Fast Road Supercharged Camshaft at the best online prices at eBay! Free delivery for many products.

www.ebay.co.uk

then get mapper to increase the rev limiter by 500 revs on stock rods and pistons,,, we done one like that 2 years a go and that car is stiff going well now on a 110,000 miles engine

well luckily I put forged pistons in it just incase but I’ll definitely look into it

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MunMun

Discussion Starter · #12 · Mar 29, 2021

But back to my main issue it should be a head gasket or oil cooler gasket correct?

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mike1967

· #13 · Mar 30, 2021

MunMun said:
We
well luckily I put forged pistons in it just incase but I’ll definitely look into it

and rods i would guess then yep fill your boots should make good power without going bang,
so when you put head back on did you clean the surfaces with brake cleaner or preclean on head and block, also head stud holes in the head where they cleaned out before ie must be dry of any fluids then the new head bolts did you you run them in and out their holes with light oil on them to ensure they all torque down at same rates ,,, while head was off was a crack test done on it, and also surface check,,, i use wellseal on head gaskets these days as ensures it seals

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mike1967

· #14 · Mar 30, 2021

MunMun said:
But back to my main issue it should be a head gasket or oil cooler gasket correct?

do headgasket sniff test on it, can also over fill header tank then look for bubbles in the coolant when engine is running ,

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