xrt-mart

iTrader: (1)

Thinking of buying a set of FRS rod and pistons to go with my 2.0ltr silver top.

I assume I am right in the fact the silver top and black top 2.0litre are 84.8mm bore? So if I wanted to use the piston/rod package this would be ok providing my engine is in good order and I use new rings?

The Only problem I can forth see is that the cylinder head has a different cc and thus change the compression ratio.

Does anyone have any other stats for me to help work this out.

Any help is appreciated.

Cheers

Mart

rs-tuner

iTrader: (1)

not 100% sure but i thought the black top had a different crank so you wont be able to use the pistons and rods for the silver top. might be wrong tho.

xrt-mart

iTrader: (1)

From what I have read its the piston and rods that are different but if used in pairs then both are fine in either engine?

pa_sjo

It'll be fine.. but.. i've never seen a used zetec block that wasn't worn beyond acceptable tolerances.. Really you'd need a nearly/new block.

xrt-mart

iTrader: (1)

So in theory it should be fine.

I have at the moment a set of arias pistons off ian howell which are 87.5mm bore so would need a big rebore and the rods machining or I could sell them and get the above.

what do you recon?

orion_crazy_carl

iTrader: (3)

i got focus rs pistons fitting in mine today for a mock up,like pa said,u need a nearly new block other wise u get some piston slap!rods fit crank fine

xrt-mart

iTrader: (1)

hmmm..

Looking better all the time. The rest of my spec is as follows:

FRST OFAB management
Ian Howell/ Ahmed Bayjoo superchip
2.5bar Cosworth map sensor
IW30 330cc Webber injector's
ERST exhaust manifold modified for Zetec head
2WD Cosworth T3 turbo
130ps inlet manifold with end-feed injector conversion using a modified focus 1.8 fuel rail and FRST fuel regulator and remote ISCV

Mondeo 136ps throttle body


Hopefully be able to run 1 bar+ and see some good results for my MK2 Fiesta

xrt-mart

iTrader: (1)

The Arias spec for those who maybe interested are:

Flat top
Bore 87.5mm
Pin diameter 21.00mm
Compression height 29.50mm

mart

xrt-mart

iTrader: (1)

any more opinions on which would be the better route?

youngben

iTrader: (2)

tbh mate if you have already got them pistons you would probs be better off putting them in! the frs pistons and rods are more based on budget builds as they do the job! up to you bud

xrt-mart

iTrader: (1)

Yeah I know what you mean but where I stand at the moment I dont know if if I will sleeves to go with the arias stuff as it is such a big bore and it will cost me Ł200 for the machine work.

If I go the FRS route then I can re-hone myself and just build it up as is now.

Decisions decisions

SiZT

Not wanting to argue etc.. but are you sure they are 87.5, not 86.5? that sounds like a hell of a re-bore and wouldn't leave much meat on the bore

XRT_si

iTrader: (2)

As stated I steered away from this method because the chances of finding a block that hadnt worn too much was rare!

Hope you make sure yours is very low mileage other wise isnt worth it imo.

xrt-mart

iTrader: (1)

Yeah 100% positive on that hence my concerns


Yes mate, I wanted to check my block for wear first and also checked with Ian H today

orion_crazy_carl

iTrader: (3)

took my zetec block and pistons and my engine chap is gonna do the measurments for me to see if the bores are to worn, but he can get new 2 litre blocks,so be handy!