danc

edit:TITLE CHANGE: V7 block work in a V5.


I have a V5 sti R with bottom end failure.


Will it be a straightforward job fitting a V4 bottom end.

If so which head gasket size would be most suitable?

has anyone done this sucessfully?

Thanks.

danc

anyone?

merlin24

iTrader: (1)

Version 5 has thin steel head gaskets, Version 4 has thick Composite head gaskets. Pretty sure the volume of the piston crowns are different also.
Vers 4 and 5 Sti pistons are both Forged HF and the Vers 4 pistons sit slightly "proud" of the deck hence the thicker gaskets( and Vers 4 head vol.)
You would have to check the volume of your heads to calculate the final CR and head gasket thickness.

danc

cheers for the info.

haven't started stripping down yet..
I must remove my Ver5 heads next and compare the pistons.

I was hoping someone had done this swap in the past

danc

well i removed the engine from the car a few days ago.


Has the procedure for removing the heads been posted before, I tried a search , but didn't find anything.
Are there any things to watch out for ?

thanks

Phildodd06

Are the type r v5 pistons forged?

500

Ask Mark at Lateral, he will know and can supply all the OE seals and gaskets needed

danc

I have the heads off my sick motor, and ...

I need someone to help confirm what version bottoms ends I’m playing with.
I need to confirm that I’ve removed a ver5 bottom end, ( the car def is)
, and that the donor is a ver4..
I have head off/ TDC pics here if someone would like to look , and try and identify both bottom ends

The engine I’ve removed
the pistons have a 'square shaped recess bowl, and the piston is flush with the deck of the block at TDC. This motor used steel gaskets

The donor block; the pistons are raised across the centre, and slope down slightly each side… and have 4 small valve cuts…….. hard to explain, have pics but can’t host them.
On the donor block the piston is down the bore a slightly at TDC. This motor used composite gaskets, I know this simply because some of the material is still stuck to the block..

Other differences include there is a timing belt small roller which is on my Ver5, and not on the donor.
Also there is an extra breather barb next to where both block halves meet on the donor, but not on my Ver5.

Any info appreciated….

Jay m A

iTrader: (2)

As 500 said, give Mark at Lateral Performance a call, he will be able to answer all your questions and provide the solutions

Shmerman

iTrader: (14)

You can use Image hosting, free photo sharing & video sharing at Photobucket for hosting pics.....its free.

danc

thanks for the link, but the filtering software at work is blocking image hossting websites

rasonline

if you email me the pics i can try and put it up for you (that's if you email filter doesn't block picture files)

rasonline@gmail.com

merlin24

iTrader: (1)

Sounds like your Vers.4 bottom end is a Legacy one from the description of the Pistons.

500

nope, I've got a 97/98 here and it has cast square recessed pistons in it

danc

rasonline.............. email sent.
thanks


It appears that the 'ver4' (donor) Semi closed deck, I have is not a ver4,

and I'm told too that the 'ver 5' i removed, should be down the bore slighlty,at TDC, but it clearly isn't.

rasonline

Here's the pics. Numbered for reference.

1.

2.

3.

4.

5.

6.

7.

8.

danc

thanks.

merlin24

iTrader: (1)

Picture 6 shows that the Doner Engine is a later Version 7 twin breather block hence the shape of the pistons.
If you remove a piston and the sump,you should have the later v7 bolted rods which are chamfered on the gudgeon pin end.

danc

thanks,
so far the donor is looking like a V7

So the title should read V7 block work in a V5 ,

merlin24

iTrader: (1)

Ah Well - got there in the end
Should have put the pictures in the first Thread

Jay m A

iTrader: (2)

Interesting to see the v5 block is not as 'semi' closed deck as the v7.

Is it really a v5 block?

LegacySTi

iTrader: (13)

V5 is open

Jay m A

iTrader: (2)

OK thanks