Whats the difference between................
Turbo Mini Forums

an 8v and 16v twinky cylinder head............ apart from double the valves!
Is there a huge advantage in fitting a 16v over an 8v or is it a bit like when the first Mk2 Golf 16V came out, people went for the badge first?
I'm sure I will be put right, just that I'm at that stage and pondering the + and - of each one.

Any pointers?

Vic

Basically the 16v head will flow a little better and I believe the torque comes in a little higher up in the revs. The 8V heads can be made to fit a small bore block but the 16V im not soo sure?

With regards to block mods and fitting kits they are identical.

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

As it was explained to me and from my own observations the K head conversions give you a more driveable engine along with the horse power gain. and as said above the 8v delivers better torque low down in the rev range.

If you want monster power at a fraction of the cost stick with the cast iron 5 port head but the price you pay is clutch slip and revy take off's every time for even the gentlest starts.

Edited by Mr Joshua on 8th Oct, 2008.

Own the day

Thanks Guy's.

I'm going the Twinky way, just could not or did not know which head to buy and wanted to know peoples thoughts.
Why have most peole gone for the 16V, is it just that there's more about!
Basically whats the difference..........hope I don't sound thick

Hi
No expert myself but the 16V will rev higher due to the smaller valves being easier for the springs to control.
Other than that I don't think there's much in it?
Cheers
Gavin :)

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The basic difference is that the 16v will flow more than the 8v thereby there is slight gain in volumetric efficiency, particularly at high revs.

I have a theory that the 8v would be better under very high boost because the 16v exhaust valves are too close together.

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."

Vizard got a patent on his PolyQuad idea. He uses one big, one small valve on the intakes, and ditto exhaust. So his 4V/cyl gets tumble and swirl, works like a 2V at low rpm. I like the idea and want to try it on a K head.

http://www.gofastnews.com/board/technical-...er-concept.html

On 8th Oct, 2008 Paul S said:
I have a theory that the 8v would be better under very high boost because the 16v exhaust valves are too close together.

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

Yeh like 30psi upwards

If the 16v has an achillies heel then my guess is that it will be exhaust valve seats.

I dont know at what boost that may ocurr, maybe far more than we want to use, who knows.

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."

Thanks for all your advice :)

I've gone for a 8V which has been stripped and will be dropped off for blasting at some point this week.

The gearbox got the same treatment and has turned out fantastic.

If I could post or knew how to post pictures you'd be able to see for yourself

Just right click on the photo, click properties then highlight the URL address. Add [i.m.g] before then [/i.m.g] after. But miss out the full stops in between the letters.

https://www.facebook.com/pages/Fusion-Fabri..._homepage_panel

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

On 8th Oct, 2008 Paul S said:
The basic difference is that the 16v will flow more than the 8v thereby there is slight gain in volumetric efficiency, particularly at high revs.

I have a theory that the 8v would be better under very high boost because the 16v exhaust valves are too close together.

Own the day

Bugger

Where do you find the URL on the picture?

Vic

right click on pic, click on properties and copy and paste the properties text in.

JF