COLEYST200

iTrader: (3)

hi lads can any one tell me are mahle 4x4 pistons and rods and same as 2wd ones as a new set is going to cost me about £400 and iv got a ofer of some second hand 4x4 one i just dont no wot to do

RWD_cossie_wil

iTrader: (9)

Rods are identical, If you need any spare rods drop me a line I have a couple spare you can have.

Pistons are different, 4x4 has an offset gudgeon pin so stops the 2wd piston slap when it is cold, I would use 4x4 pistons if you can.

Dirty Harry

iTrader: (12)

rods are different there is a "light" and a "heavy" rod,difference being the counter weight above the little end,so make sure you have a match set,also the 4wd pistons have a different size bowl in the piston which will effect yout compression ratio,persoanly I what ever pistons you use gets them decked and bowled oout the decking will avoid any pistion to valve contact which all cossy engines had even from new,so you will get even more conatact as your head will have been skimmed at some point

RWD_cossie_wil

iTrader: (9)

Good info Pete. Reading the Cosworth manual, apparenly the rods were marked on the caps, L for light, no marking for normal weight and H for heavy... Is the counterweight different between the 4x4 and 2wd Rod?

Dirty Harry

iTrader: (12)

I am not quite sure as i have seen both type rods in both 2 and 4 wd engines,I think its what was to hand when they were assembled

RWD_cossie_wil

iTrader: (9)

I got that feeling as the numbers on the rods are the same, and I have a set of 2wd rods and a set of 4x4 rods, but a few have the L/H stamps on them.

Chip

iTrader: (3)

3 types of rod arent there?

H
S
L


No correlation ive ever seen between wether its a 2wd or a 4wd though, like Pete mentions, seems to be entirely random.

RWD_cossie_wil

iTrader: (9)

The Cos manual says that the heavy/ light rods are marked as such, standard are not marked, but over the years I have seen loads marked with S, and loads with pin punched dots indicating 1-2-3-4, so I think the best thing to do is just get them balanced when you build the engine.

COLEYST200

iTrader: (3)

IV GOT 2wd rods at the mo which are still on the standerd pistons but iv had it bord out to +5 pistons as the motor went sick . the lad has got 4x4 +5 pisons with the 4x4 rods would they go straight in . im going to have wot ever pistons i get pocketed out as in putting bd14 cams in martin at rayland is going to be doing this for my

RWD_cossie_wil

iTrader: (9)

just use your rods mate

COLEYST200

iTrader: (3)

so 4x4 pistons will fit on 2wd rods

RWD_cossie_wil

iTrader: (9)

Yes mate

COLEYST200

iTrader: (3)

just got to see wot he wonts for them now

RWD_cossie_wil

iTrader: (9)

Matt Lewis will do a set of brand new pistons for about £350 I think. Might not be worth using secondhand pistons it is a bit of a false economy.

COLEYST200

iTrader: (3)

you are right mate me and matt have had a chat on the phone about them its just £££££££££ is so tight at the mo . but saying that it needs to be right when it gose back togever

-beefy-

iTrader: (6)

coley , ive pm'd you fella ,


beef

LHD220Turbo

iTrader: (4)

if your building a motor i wouldnt scrimp on pistons mate; do it right first time

Matt Lewis

iTrader: (2)

Exactly!!


Regards Matt