Technical Punto Mk2 1.2 8V to 1.2 16V Conversion

[SamuelAbarth]

I'm looking to convert my punto 8v to a 16v 1.2, and im just wondering what i would need and the the average amount of money it will cost. it's a Punto 1.2 8v 2001 with 72k. Thanks. just want that Extra power. was considering putting GSr Induction, re-map etc on my 8v engine but the power gains i was told i thought its not really worth it. thanks

 

[bredsticz]

Power gain between an 8v and 16v engine are extremely minimal.

An induction will probably give you more gain.

I don't actually see how more valves give a car more power

 

[Moosey]

I don't actually see how more valves give a car more power

Higher flow capacity.

For a 16v conversion.. You're better off buying a 16v car. You'd need to swap a lot of the engine over, wiring loom, etc, fusebox, keys, lockset (unless you got the ECU decoded), etc.

More hassle than it's worth.

 

[bredsticz]

So does 1 valve still have an intake and exhaust capability?

I presumed doubling them you have a set for intake and a set for exhaust, so 1 valve does either intake or exhaust, not both.

If all valves still do both jobs then I understand the power gain then!

 

[Moosey]

You have dedicated intake valves and dedicated exhaust valves, they only flow one way.


The only engines i've ever heard of that can have only 1 valve per cylinder are large 2-stroke diesels. They're 2-stroke with exhaust valves. Most of these kind of engines actually have 2-4 exhaust valves.

It's all about "proprietry valve area", ie the size of the valves. The bigger the valve area, the higher the flow capacity and the more power potential as you can cram more air/fuel mix into the cylinder.

Example of valve area:

2-valve per cylinder:

4-valve per cylinder:

5-valve per cylinder:

You get 3-valve per cylinder too, but who cares..


Aaaaaaaaaaaaaaanyway, if you're going to the trouble of swapping an engine, you're better off putting an HGT engine in, instead of doing a 1.2 8v to 16v swap.

 

[alexbpl]

If you can find an engine for cheap then the conversion will cost you little, other than time, and will probably be worth it.

If you do everthing yourself, then it will take you a fortnight of evenings. Less infact, if everything goes to plan.

I have just done a 16v swap. Albeit in a different car, but everything is more or less the same.

Any questions please ask, as I ran into pretty much EVERY problem you could have!

 

[simondhopkins]

power gains minimal? From 60 to 85, thats not exactly minimal. But don't forget extra power means extra petrol. I just want my 55 to breath better for a cleaner burn.

 

[simondhopkins]

You have dedicated intake valves and dedicated exhaust valves, they only flow one way.


The only engines i've ever heard of that can have only 1 valve per cylinder are large 2-stroke diesels. They're 2-stroke with exhaust valves. Most of these kind of engines actually have 2-4 exhaust valves.

It's all about "proprietry valve area", ie the size of the valves. The bigger the valve area, the higher the flow capacity and the more power potential as you can cram more air/fuel mix into the cylinder.

Example of valve area:

2-valve per cylinder:

4-valve per cylinder:

5-valve per cylinder:

You get 3-valve per cylinder too, but who cares..


Aaaaaaaaaaaaaaanyway, if you're going to the trouble of swapping an engine, you're better off putting an HGT engine in, instead of doing a 1.2 8v to 16v swap.

Note the busted 8v head

 

[bredsticz]

Ahh ye I get it abit more now and I didn't think the 16v had that much more power than the 8v.

 

[karbineftw]

It's simple really. More valves mean more fuel can be put into the cyclinder to be burnt.

 

[arc]

and air, and get out the cylinder quicker, and mix better.

worth noting though, 8v engines tend to have better low down power but then 'run' out higher up the rev range. 16v engines behave the other way round.

 

[karbineftw]

and air, and get out the cylinder quicker, and mix better.

worth noting though, 8v engines tend to have better low down power but then 'run' out higher up the rev range. 16v engines behave the other way round.

Yeah sorry, fuel-air mixture