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

if your running that capcity ,and using a head off a 1200cc engine ,then you DO want to flow it as much as you can .
try the bike tuners ,bigcc down in bracknell etc ,look in the bike mags for head modifiers for alternatives .
jk is extremely professional in his business ,and judging by his bhp form the nat asp engine his company prepared ,you may go a long way to get better .
also the best sign of a good porter is they have ,and know how to use ,a flow bench ,get some specs of heads they have done before and after so you can judge for yuorself if they know what they are doing .

regards robert

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

IIRC Jon uses Schloar (sp?) for head work.

I've just done some calcs on the benefit of improving the airflow in the inlet port.

Take a 1293 with a K1100 head that should produce about 220hp at 15psi boost.

That needs an inlet port air flow of 46cfm. It has to get that into the cylinder in 180 degrees of a 720 degree cycle. So assume an average port flow of 184cfm.

The standard K1100 head has been measured at 150cfm at 25"Hg pressure drop.

Using the square law realtionship for pressure loss, the loss at 184cfm would be 22.5"Hg.

Assuming that you could improve the head to flow 184cfm at 25"Hg pressure drop, the improvement in hp would be the same as increasing the boost by 2.5"Hg or 1.2psi.

Hence, very little return for a high price when you can achieve the same with a little more boost.

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."

you might as well be talking Klingon Paul

http://guy-croft.com/

On 6th Oct, 2008 wolfie said:
you might as well be talking Klingon Paul

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."

so, small bore head =58 psi boost = 11 sec 1/4 lol

On 6th Oct, 2008 Paul S said:

On 6th Oct, 2008 wolfie said:
you might as well be talking Klingon Paul

It goes some way to explaining how Star Mag did a 12.8 second quarter with a standard 5 port head.

That's right. Tell me again why you fitted that 7 port head

On 6th Oct, 2008 mini13 said:
so, small bore head =58 psi boost = 11 sec 1/4 lol

On 6th Oct, 2008 Paul S said:

On 6th Oct, 2008 wolfie said:
you might as well be talking Klingon Paul

It goes some way to explaining how Star Mag did a 12.8 second quarter with a standard 5 port head.

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."

a very well setup car maybe? perfect suspension settings or a "standard head" which achually isnt?

On 6th Oct, 2008 Paul S said:

On 6th Oct, 2008 wolfie said:
you might as well be talking Klingon Paul

It goes some way to explaining how Star Mag did a 12.8 second quarter with a standard 5 port head.

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-Ford S-max Mk2 Ecoboost
-Rover 100 VVC #2 - track project

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because the injection code didn't exist yet

On 6th Oct, 2008 Paul S said:

That's right. Tell me again why you fitted that 7 port head

On 6th Oct, 2008 mini13 said:
so, small bore head =58 psi boost = 11 sec 1/4 lol

On 6th Oct, 2008 Paul S said:

On 6th Oct, 2008 wolfie said:
you might as well be talking Klingon Paul

It goes some way to explaining how Star Mag did a 12.8 second quarter with a standard 5 port head.

you have overlooked the most important factor! GRIP!

On 6th Oct, 2008 Paul R said:
a very well setup car maybe? perfect suspension settings or a "standard head" which achually isnt?

On 6th Oct, 2008 Paul S said:

On 6th Oct, 2008 wolfie said:
you might as well be talking Klingon Paul

It goes some way to explaining how Star Mag did a 12.8 second quarter with a standard 5 port head.

Ha Ha, got me there.

On 6th Oct, 2008 mini13 said:
because the injection code didn't exist yet

On 6th Oct, 2008 Paul S said:

That's right. Tell me again why you fitted that 7 port head

On 6th Oct, 2008 mini13 said:
so, small bore head =58 psi boost = 11 sec 1/4 lol

On 6th Oct, 2008 Paul S said:

On 6th Oct, 2008 wolfie said:
you might as well be talking Klingon Paul

It goes some way to explaining how Star Mag did a 12.8 second quarter with a standard 5 port head.

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."

All of those things, plus boost to overcome any flow restriction in the standard(ish) head.

On 6th Oct, 2008 James_H said:

you have overlooked the most important factor! GRIP!

On 6th Oct, 2008 Paul R said:
a very well setup car maybe? perfect suspension settings or a "standard head" which achually isnt?

On 6th Oct, 2008 Paul S said:

On 6th Oct, 2008 wolfie said:
you might as well be talking Klingon Paul

It goes some way to explaining how Star Mag did a 12.8 second quarter with a standard 5 port head.

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."

actually when i got the head i was going to go N/A with some bike carbs, but some cretins on here convinced me to stick a turbo on it.

true but we may never know. as for this topic as its gone abit to the west, i still think JK at Spechialist components will be your best bet. and do you really want a 1430 turbo? it seems like your not 100% sure you want t turbo charge your engine to me, why not supercharge or N.A screamer?

On 6th Oct, 2008 Paul S said:

All of those things, plus boost to overcome any flow restriction in the standard(ish) head.

On 6th Oct, 2008 James_H said:

you have overlooked the most important factor! GRIP!

On 6th Oct, 2008 Paul R said:
a very well setup car maybe? perfect suspension settings or a "standard head" which achually isnt?

On 6th Oct, 2008 Paul S said:

On 6th Oct, 2008 wolfie said:
you might as well be talking Klingon Paul

It goes some way to explaining how Star Mag did a 12.8 second quarter with a standard 5 port head.

Drives
-Ford S-max Mk2 Ecoboost
-Rover 100 VVC #2 - track project

Searching is all you need on TurboMinis

I see what your saying about the flow figures of the head versus the few extra psi of the turbo Paul S. What would the situation be with a 1460 though? Would I need to add a fair amount more psi of boost or will I need less?
The main reason I want to get the head fully worked is to bring up the torque figure across the rev range while the turbos not on song. I'm aiming for around an 8.5-1 c/r using a decompression plate. Now i know this isn't perfect but the big powered skylines, supras and the like use them so i cant see it being a problem.

if you do a little search, decompression plates are abit frowned apon due to being a shortcut, which brings alot more problems, eg more places for the head gasket to go! which is never good

Drives
-Ford S-max Mk2 Ecoboost
-Rover 100 VVC #2 - track project

Searching is all you need on TurboMinis

Ive wanted to turbo charge my car from the outset. The only thing that has changed is the cc. It went from 1380 to 1430 and when cash permitted, 1460. If i build an N/a motor or a supercharged motor its never going to be as powerful as I can make it. This will be my last mini for sure as sooner or later im going to think to myself fwd and 300+bhp is pointless when i can have a 700+bhp 4 wheel drive Audi S2 or Ur Quattro. Im just trying to go balls out in everyway.

somone has made 300+ from a 1293 with a 5 pot iirc. are you trying to make the most powerful in HP figures or the quickest 1/4, hill climb, curcuit racer? Hp isnt always everything a very well setup car that can get the power down can be faster than somthing with more hp you have to remember that. iy sounds as thought you have the readies for it so why not hold fire and decide what you want to do with it.

Drives
-Ford S-max Mk2 Ecoboost
-Rover 100 VVC #2 - track project

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Your most certainly right but as I said previously theres only so much you can take out of the head and piston. The block is completly dry decked too so this should help matters i think. I am however considering getting some JE pistons made with the pin moved higher up toward the piston crown

Edited by Oldskoolbaby on 6th Oct, 2008.

I know exactly what your saying. Well the thing is, my car is a 1960 Mk1 and has never been on the road. For years and years it was one of the quickest N/a sub 1000cc cars going. It competed in the Worlds fastest Mini race in 2000 and from then on was used for developing part for LYNX Ae who originally campaigned it. I suppose I'm trying to keep up the tradition for mentalism with this car and given that I'm making it a trackday/drag no rules are now holding it back. I want something similar to what you see go around Gatebill only Mini shaped really. Suspension wise it will be as played with there in that department as in anyother (though im not stupid and i know ill never beable to put 350+bhp down on the exit of a corner or at anything under 70mph lol)

Edited by Oldskoolbaby on 6th Oct, 2008.

If you choose your turbo right, you won't have any problems with lag. The K heads flow soo much better than the 5 ports, you can get away with running bigger turbo's without the sacrifice of having loads of lag.

I agree that getting the CR down to "normal" level would be difficult on a 1460, but with the extra fuel control it could be made to work.

A decomp plate isn't the way to go to lower the CR...You'd be better off running the pistons down the bore a tad.

Edited by matty on 6th Oct, 2008.

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

Yeah I'm pretty sure your right matty about the fuel control but like ive said before im no expert when it comes to ecu's etc.


By the way, thanks for the feed back lads. I really do apprieciate it good or bad.

with what you plan to use the car as track and drag imo you dont need 300 odd hp. im not 100% sure but i dont think the DON or Nic's car has 300hp and they are both very quick drag and track cars. i personally think you will be wasting money and time trying to get 300+ hp when you dont need that much for what you plan to do

Drives
-Ford S-max Mk2 Ecoboost
-Rover 100 VVC #2 - track project

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Yeah i know what your saying, but like ive said, I just want a little monster. If im sitting at the Pod on the start line there's no way ill have the boost wound right up. If i exit the last corner at silverstone, there also no way my foot will be flat to the floor but if im in the playful mode then hey presto