diy budget 998 turbo head pictures
Turbo Mini Forums

Here is something for you Turbo guru's to have a giggle at.

Its my kitchen special 998 unleaded turbo head.

Its a work of art I tell ya





Not finished just yet but almost there now

What kind of valves are you using?

It seems as you haven't ported the valve throats. These are much more important than the area near the manifold face.

Its not finished yet mate.

I need a flexible extention to get into there.

Valves will be the standards... Its just a home brew jobbie to learn the basics.

Engine will be a 70-75bhp job

What cc's your chambers ends up with ?

Rusty by nature

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

pop the valves out and get rid of the bosses that the valve guides sit in, theyre a huge restriction

"Turbo's make torque, and torque makes fun"

"did you know you can toast potato waffles?"

pop the valves out and get rid of the bosses that the valve guides sit in, theyre a huge restriction

"Turbo's make torque, and torque makes fun"

"did you know you can toast potato waffles?"

I'm getting 112hp from 12 psi boost on my 998 with a totally standard 12G295. I have fitted 214N valves though.

So they are pretty good in standard fettle. I will be improving mine in the future.

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."

Good on you for having a go. Last time I tried it, was on a crossflow head. after about 8 hours or so went straight through into a water way. :(

Thanks Guys

I have limited tools,time and money so the valves will stay and standard but I will work the throat area a little.

What do you mean by remove the bosses?

Do you mean the valve guide ends?

Sorry I am very new to this

The chambers are not completed yet and are still a little low on CC.
I am aiming for the same as a 12g295

Edited by garrett3 on 22nd Jan, 2010.

Rusty by nature

Ha, ha, brilliant, you can write fake quotes !!!!

Rusty by nature

eh?

Edited by garrett3 on 22nd Jan, 2010.

Sorry mate, did I mis-spell something ?

Rusty by nature

dont go crazy on the ports,

concentrate on the valve gude bosses, throat and seats, these will make the most diference.

Garrett, the bosses referred to are the lumps sticking up surrounding the valve guide.Maybe a bit of caution here as the guide needs some support and, more importantly, contact, to get rid of the heat, especially on the exhaust side.
Any reduction will be a help. Have you read Vizard ? If not do have a look.

Garrett, the bosses referred to are the lumps sticking up surrounding the valve guide.Maybe a bit of caution here as the guide needs some support and, more importantly, contact, to get rid of the heat, especially on the exhaust side.
Any reduction will be a help. Have you read Vizard ? If not do have a look.

advantage: what are you on about?

advice / ideas, whatever you want to call it

I understand you retain standart size valves.
This choice implies issues.
I try and list the issues and previous experiences from people on here to help you get the most of your setup.

The mention I made of a fake quote was my own : it says david Vizard in 1999 !!!
(he did write that actually)

Rusty by nature

Ahh, I see

It looked like you was talking about me with the quotes lol
Sorry bout that.

Thanks for the advice and I do realise that the potential is limited but my whole point of this is to learn basics without spending large sums of money.

When I think I can sort a head out without wrecking it then I will get a better casting and larger valves etc.

For now I'm just learning as I go with scrap parts and seeing what happens.

And the CC is now 28ml



This should see me good for the compression side of things.

Next will be to try and get a good throat?

Edited by garrett3 on 22nd Jan, 2010.

christ, did you piss in it?



lol, remember to measure all the chambers and get them the same within reason

"Turbo's make torque, and torque makes fun"

"did you know you can toast potato waffles?"

Vizards Theory and Practice of Cylinder Head Modification is worth getting hold of, maybe a bit out of date, but it will take you in the right direction.

Thanks

Not piss mate lol its diesel engine oil :$

Believe it or not I have been working with a vizard book... guess my work must be bad then lol

yup its within 0.4 right accross the board mate... not very polished but it will do.

Ive done things a bit back to front and upside down but its all part of learning.
I think? lol

Edited by garrett3 on 22nd Jan, 2010.

lol actually its looking good :)

the book above just gives more info on why things are done than the tuning BL's a series as its not specificly for one engine.

I will see if I can find one of those books online.

I have the third edition book at the moment

Thanks for the pointer