NA FSI with port injection

Hi,

After some searching on here I see the FSI engine has specific pistons for the direct injection.

I've read you need to change the pistons to run the engine on port injection. Why is this?

How would this engine run with port injection with this type of piston?

And does anyone know the rod length? or the gudgeon pin size?

I'm wondering if ABF/9A pistons could be fitted, with machining to the block or pistons to get the desired compression ratio.

Thanks

 

I hope Jason will turn up I'm sure he has/was/is building one

 

The shape of the FSI piston is not intended for port injection and would compromise power output , so a more classic pentroof type piston would be used.


OEM rod lenght is 144 mm but tapered small end / 20 mm pin

more and more parts are now coming available as pistons , cams, inlet manifold, exhaust flanges, heads , valves, etc

for more info and pictures sent an I.M or Email

 

Thanks for the reply.
HPR, I've sent you a email.

Does anyone know how much effect the standard piston would have to power?
Around 5? Or more like 15+?

Has anyone seen or heard of this setup running in any cars?

 

if it helps I have 1600FSI stripped in work at the moment, not as nice as a 2L

 

Thanks for the offer, but i'm only really interested in the 2.0.

After a bit of searching I read one benifit of a direct injection engine, is injecting the fuel last minute can help prevent detonation.

So I guess using the original FSI pistons with port injection might limit the amount of ignition timing before detonation. Please corect me if I've got this wrong.

If this is the case, it would be interesting to know how much effect it has to the power.

9A 16v also use a 144 rod length and a 20mm gudgeon pin. I wonder if these pistons could be used in the FSI engine

 

Injecting fuel directly into the cyinder cools the combustion chamber increasing the det limit and allowing more compression.
On engines like these you can run mulitple injections from on the suction stroke right to the compression stroke.
The pistons for VW DI NASP EA113 engines are wall guided i.e direct the fuel spray mix with the swirling air towards the spark plug and promote a better burn.

If you attempted to run the engine as a PFI you would encounter mixture distribution issues when the piston is sweeping up and down the bore with its odd crown.

The real benefit of the this engine for people like us is the cylinder head design. Thanks to the increasing requirement to have clean burning engines, VW had to design a prper pent roof head that is similar to that found on the Ford Duratec, Opel ECOtec, Honda K/B series and Toyota "GE" type engines.

 

Thanks for explaining Toyotec.

It's the head design thats got me interested in these engines. After reading about so many people spending lots on the older 16v engine's and not getting great results when normally aspirated.

I've watched a few engines go fairly cheap on ebay aswell.

Do you think the 9A pistons could work in this setup?

 

How would you compare it to those heads? if you have any experience with those..

 

They should work but if you are going n/a for getting great results why use these?

 

Because I would aim to do it on a budget

And I can't see any off the shelf pistons available.
Where as there are plenty available for the 9A with different compressions

 

Improved squish pads.
Valves with more than 40 deg between IN and EX.
Ports with minimal bends into valve bowl.

 

Yes, Wossner does the pistons.

 

Have you got any links toyotec?
I've seen some but thought they where custom jobs.

 

My bad mate,i thought you were talking about using stock compression 9A pistons.

And yes wossner have them

 

I wanted a comparison of the tfsi head with the other make heads, not the 027/051 head..

 

Does anyone have a link to the wossner pistons or any others?

I've search the net and there catalogue and can't find any.

I know HPR has some, but I believe these are custom items (hopefully wrong)

 

http://www.tsr-performancestore.com...-compression-wossner-forged-pistons-716-p.asp

 

Why would you start from 9A pistons, you need to machine valve pockets and 2nd squish pad
this add to the total price , spend a bit more and it drops in without hassle.

There are N.A FSI pistons on the internet, off the shelf

JE , Wiseco , Wossner , CDS all have made them before , so they should be able to deliver them
( not always in their catalog) ... apart from the fact most piston manufacturers have made TFSI pistons , so they have the basic dimensions already to make some custom pistons

My Wossners were made for a lambo Galardo V10 and became absolete

 

Searched all there catalogues. And nobody list them.

I'll send them some e-mails and see if they what they come back with.