Tuning turbo time!

[craigb244]

Hummm I will look into it when I strip the head but the block water passages are differant on the block but if imaging the flow is controlled mostly by the head gasket.

The cams will be different but I definitely recon the mk1 will be better. But either way I'll probably have a set made once the cars up and running

 

[craigb244]

My email is the same as my username @gmail.com

 

[craigb244]

shweeeet

 

[fingers99]

View attachment 145048shweeeet

OK, so they're full floating and the rods are better. But are the pistons forged or cast?

 

[craigb244]

All the bits are in the parts washer at work so I'll have a look tomorrow... Not that I'm bothered! My home made pistons have held up fine so got no worries about these

 

[craigb244]

Oil pump on these are huge!

Gave it a bead blasting on the outside and rebuilt



Noticed something VERY strange on one of the bores!



Going to speak to our engine builder Monday and see what he thinks!

 

[hf turbo]

whats the piston and rings like on that bore?

 

[craigb244]

Rings and piston look fine they all look very good it's a very low mileage engine as you can see the cross hatching is like new.

The lines are to perfect. I recon it's probably something picked up on the tool when the bloke as bored out as its a actually a spiral down the vote from top to bottom

It's not deep just strange! Doubt it will cause problems or effect performance

 

[fingers99]

See what the man says. From here, though, it looks deeper than the hatching. Very, very strange.

 

[craigb244]

Yes it's deeper then the hatching but not deep enough that you could catch it with your nail you can JUST feel it!

To be fair the photos pick it out and make it look a lot worse then it is!

The engine is original and untouched

 

[craigb244]

Anyone happen to know where I can buy fiat engine parts from? I did have a fiat dealer with a big parts department by my parents but it's now a Nissan dealer!

I don't mind buying online!

All the shells in this engine are perfect except the centre crank shell with the thrust bearings attached! One of them has detached itself from the shell. Not really a problem as its fixed in place once the bottom half of bolted on and is just lightly spot welded to help assembly, but I really don't want to fit damaged parts for the sake of a few quid....

 

[fingers99]

Give Big Mick a bell. Failing that, I think Stoneacre will do stuff over the 'phone or there's Vickers in Shrewsbury or Guest in Wolverhampton.

 

[Razman]

Definitely go for big mick.

I used him for all my engine rebuild bits, very friendly and helpful. He can get all the little gaskets and seals most people can't!

 

[craigb244]

Rings and shells ordered! Ended up buying everything because fiat have updated the design of the thrust washers and was only a little more for a whole set of mains.

Pistons have been in the parts washer so now look like new. Going to smooth off all the sharp edges around the valve reliefs and have anti detonation groves machined into them.

Fingers crossed I'll have it built back up by Saturday then I'll strip the head and see what changes I find!

Also going to do a detailed measurement of the cams and see how they differ to the mk1 16v and a few other cams I have and see what is best to use

 

[hf turbo]

how different are these piston to the 1.2 16v pistons?

just thinking if they would fit the 8v engine

 

[craigb244]

They are totally different. They have a huge dish in them (like I did with my 1.2 Pistons! )
They have a fully floating gudgeon pin and it is a little lower down the piston so either the rod is shorter on the tjet or the block is taller (Id say taller block)

 

[hf turbo]

no chance of them fitting the 8v lump then, do you think the rods are changeable?

 

[craigb244]

Depends on the gudgeon pin size. I can measure them tomorrow. I made a list somewhere on here with a list of sizes but you'll have to search for that.


If you are thinking of using them in a 8v to lower compression on a 1.4 then I'd go for the 16v N/a Pistons as these would lower the compression far to much on a 8v!

Also they 16v Pistons will be much cheaper!

Could probably even get custom made Pistons for the price of a tjet engine just for the Pistons or buying new from fiat!

 

[craigb244]

Photo I forgot to add!

One piston as it came out!
One built up ready for fitting
One stripped fresh out the cleaner ready for rebuilding!



Wish I could get this thing done quicker but I'm doing it all at work for a hour at the end of the day

 

[craigb244]

Crank and rods shot blasted

Crank journals, Small end bush and gudgeon pins mirror polished