Any suggestion on who to modify my K Head?
Turbo Mini Forums

Go for it...whats the worst that can happen!







And no im not joking...I seriously recon you should do it, try and get the CR to around 9.0:1 and you should still be able to run some good boost. Mine is at 8.8:1 and ive ran 12psi and will hopefully get round to running it at 20psi once the suspension is sorted. Mine is roughly the same power (if not more) on 6psi as my 5 port was on 17psi.

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1/4mile in 13.2sec @ 111 terminal on 15psi

Saul Bellow - "A great deal of intelligence can be invested in ignorance when the need for illusion is deep."
Stephen Hawking - "The greatest enemy of knowledge is not ignorance, it is the illusion of knowledge."

Matty, im not sure if I spoke to you at Mini in the park. Were you running up there?

Ah yeah, I may of done I think you caught me just after I found out my turbo had blown? Lol

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1/4mile in 13.2sec @ 111 terminal on 15psi

Was that the problem? Yeah u had some sort of issue

Yep, it blew big time! Managed to limp home though.

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1/4mile in 13.2sec @ 111 terminal on 15psi

Well at least you never had to rely on a break down truck

as regards off boost torque, I need to dig out my power curve, but I'm pretty sure I have the same torque at 4000 rpm as 7500 rpm. Not sure what you a trying to acheive but do your really want 300bhp for a track car?? a lot of cars here have a lot of power, and have not blown up .....yet, but how many of them could manage flat out on a track for 15 laps?? I think I can say that mine is one of the more track ready cars, but not sure it would hold together for 15 laps of hard driving, pootling around on a action day where you can't overtake on bends maybe.

Team Racing

Thanks for your comment Jimster. I can see your point and like i said a few replies back, it won't be boosted to the eyeballs when im hammering it around the track or down the stip. Its just once in a blue moon to see what its got for what ever reason. The same reason why these crazy sweeds tune m5s, m3s to 1000bhp plus. Its not because it will get them round the track the quickest, its purely because they can make that power if they want.

This sounds like an interesting project, make sure to post a build thread!

yeah im with jim , you wont find me hammering my mini to death for 15 miniutes ...ask nic he'll back me up ,nic .....nic...... you there .... ....
oh dear

Medusa + injection = too much torque for the dyno ..https://youtu.be/qg5o0_tJxYM

oh before i go off to bo bo 's , ill also say ,...go for it too..
id completely disagree with paul, with respect of course ,not to get into the thoery ,just to say that get absolutely every bit of flow and cam lift you can out of the head ,and it will make a huge diff to bhp. the difference betwen a 120 bhp k head car ,and a 160 bhp k head car ,is all porting and cams and pipes ,
when you think that boost adds a percentage of power ,you can see how a 120 time 100% is 240 ,and 160 times 100 percent is 320 .

big difference.

build what you want ,not what others think is best for you ,if you want 300 bhp ,go for it ,
try your best ,if it works great if not hey you knew that going in ,its still a bloody good adventure .

oh one last thing , if you have that capacity , isnt the gap between the middle cyls a touch thin for v high cyl pressure ?(he says shooting his rant in the foot lol)

Medusa + injection = too much torque for the dyno ..https://youtu.be/qg5o0_tJxYM

Team Racing

Saul Bellow - "A great deal of intelligence can be invested in ignorance when the need for illusion is deep."
Stephen Hawking - "The greatest enemy of knowledge is not ignorance, it is the illusion of knowledge."

the bore distance would be the same as for a 1380. Its just longer stroke.

Just received a pm from John concerning the head tuning. As I thought originally, its not something to be over looked because the head in question already flows well. The point is more that every little helps. The thing is, if I gain 20-30bhp, i'll be over the moon. Its 30bhp i wouldnt have had and maybe 10% of what im looking for.


After all, IT A MINI ADVENTEURE!! LOL

Hi,
If you're going all out you'll need every last bit to help you on the way!
Cheers,
Gavin :)

VEMs Authorised Installer / Re-seller. K head kits now available!

WB/EGT gauges. Click here for customers write-up

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My Mini build diary

Medusa + injection = too much torque for the dyno ..https://youtu.be/qg5o0_tJxYM

If thats the case I wouldn't bother going any bigger than a 1380! A long stroke 16v doesn't sound like a good combination to me?

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1/4mile in 13.2sec @ 111 terminal on 15psi

There an old saying 'theres no replacement, for displacement'

But In all honesty, it speaks bollox. Just fit a turbo and wind up the boost.

1460 BMW K turbo will be a head ache in every respect. I'll go with everyone else and say that the 1460cc is not needed, the 1380 will be more than enogh, make the combustion chamber more manageble, give you spare cash you would have spent on a crank, to develope the engine further.

Its all fine and well building a monster engine, with monster power and torque figures, but, even the Quaiffe box was only ever designed for 170bhp in a NA engine so as such thats on the limit, then there is the clutch, yes a twin plate is one answer, but then theres the drive train, and last but not least, putting the power down on the road, people already struggle with 250bhp.

Building an all out 350bhp monster might as well be sat on a stand and a video'd for Youtube.

No Im not trying to be negative, even though it may sound that way, im just trying to sound practical. Build the engine, but at least consider the effects a long stroke crank is going to have an a high reving engine. Dont forget that these engines can see 9k very easily, and with that sort of turns, large torque figures from the turbo will give the big bananas.

Stick a long stroke crank in there and you need to butcher the block and box ( possible weak point on a big banana motor) and the longer stroke reduces the rpm potential. John K has already spoken about the piston speeds on a standard stroke being higher than ideal.

Bigger is not always better. Just wind up the boost :)

In Light and Peace

Sprox

Notwithstanding the above, there are four things that make power in a turbo A series:

1. Head.
2. Cam(s).
3. Turbo.
4. Intercooler.

With a K headed engine the cylinder head is the least important as it already flows very well in standard form.

On the other hand the cam and turbo selection and a big efficient intercooler are critical to achieving the desired power output.

Forget the head and concentrate on the important bits.

Saul Bellow - "A great deal of intelligence can be invested in ignorance when the need for illusion is deep."
Stephen Hawking - "The greatest enemy of knowledge is not ignorance, it is the illusion of knowledge."

sounds like we'll have another candidate for in gear boost control and traction control!

- If you are serious give us a call and we can discuss specs to get what you are looking for

JK

If Carling made Mini engines
it would probably be like this one!

Edited by Rob H on 7th Oct, 2008.