Rossco

Right guys, after a head CC check last week a major compression problem has reared its ugly head and i think its only oing to get worse

So far ive got a block which has been bored to 86mm because we were going to use the Accralite pistons, problem being these pistons are designed for a ZVH conversion and a CVH has a lot bigger cumbustion chamber in the head than a Zetec.

We measured my head last week and it was 43.5cc, when you add the head gasket and asume that the pistons sit flush with deck at TDC (which iam led to belive they dont ) that is going to give me a compresion ratio of 12.49:1.

The Accralite pistons have a 10mm thick unfinished piston crown, so iam going to have to be removing around 6mm of the top

As i did not pay anywhere near full price for the pistons iam not that fussed and will easyly get my money back for them, so i thought foook it, new pistons and steal rods are needed

So guys what are your susgestions?

Head CC`s: 43.5cc
Head Gasket: 10cc
Bore: 86mm
Its an early Zetec block
Iam looking for around 7.8:1 - 8.0:1 compression ratio

Thanks for your help

Ross

Anonymous

I would sell those pistons and get some more suitable ones.

You cant just chop 6mm off them all the way across, the squish band will be gone.

you need a dish in the pistons.

Rossco

Yeh tell me about it Chipper, the pistons are going to end up like milk bottle tops

Do they need to be dished though, as they are unfinished crowns??

Iam waiting for Doug (garage19) to reply as iam sure he has just sorted some rods and pistons from the states.

Fudgey

iTrader: (4)

doug is in plymouth today, and going on hols for a week on weds.

he used diamond pistons and eagle rods, but i dont know the specs...

Anonymous

They need to be dished if you are trying to get that much volume out of them as otherwise the edges of the pistons are going to be 6mm down the bore!

Rossco

Well that aint good enough, bloody part timer!!

Think iam gonna give Ian Howel a ring and see what he can offer.

Rossco

I emailed Ian today, this is what he had to say:

"I have a several options for you:

1) Focus WRC rods and Forged pistons Ł1280
2) H beam eagle rod with custom forged pistons Ł1150
3) Farndon H beam rod with Vauxhall LET piston Ł1300

All will be provided in the CR of either your or my choice, and all can handle the boost without issue.

I also supply turbo's if you haven't already purchase one, along with valve springs, cams, modified water pumps, ARP's, & EEC4 kits for Mark/Ahmed to map onto.

Cheers

Ian"



Anybody want some Accralite pistons for a ZVH conversion??

Danny B

give me a call if your after eagle rods, were a dealer for them.

Smit

iTrader: (5)

Ross - Met Ian howell at USC this year with Faye + Alex.

Seemed a very very genuine bloke

AustenW

Go with Ian and you won't have any problems

Red16

what do people make of these ?

theyre allegedly

"For 2.0 l zetec engine standard bore (84.99mm) no need to over bore.

Inverted dome to give a compression ration of 7.9-1 for zetec (on 48cc UK head)

Inverted dome to give a compression ration of 7.35-1 for ZVH (on 55cc CVH head)"


http://cgi.ebay.co.uk/Zetec-ZVH-rs-t...QQcmdZViewItem

Brasso

Rossco

I cant recommend Ian enough mate. Go with him you wont be dissapointed.

Rossco

Blimey, sounds like a top bloke

Is anyone using any of the combo`s he sugested?

Brasso

Maybe.

Rossco

Brasso, just looked through your project thread, your car looks the tits mate

Its looking like the Focus WRC rods are gonna be the ones

Come on spill the beans which ones are you using?

JAP CRAP

...

mrviper

when i test fitted my accralites the pistons stuck out of the bore about 2.5mm so i skimmed off 4mm the max burtons advised

the head had been machined out to bring the combustion chamber to 49cc

and a standard focus rs headgasket

my c/r is 9.5:1 running a bar and get wheelspin in 3rd

Badman38

iTrader: (2)

i'm using eagle rods and je 85mm pistons in my zvh once i have fitted my twin plate paddle clutch so i can run full boost, i'll post up a power graph.

Rossco

Yeh i remember chatting to you when i first posted that i was going to use Accralite pistons, seems they are only designed for use with the CVH as the cumbustion chamber is quite a bit bigger.

9.5:1 is way to high for the FRST managment as its no way near as good as the stuff you are using, my engine builder has said 7.9:1 max!

That looks like a pretty impressive set up you have there mate, id love to see a full power graph, what are you aiming for?

Badman38

iTrader: (2)

on my old zvh made 311bhp 292fbt @ 19psi but the injectors were maxed out, the engine was low on compression on number one cylinder, the cam was'nt dialed in properly, the exhaust down pipe was too small like two inches in diameter losing me torque so thats a guide the base of my current engine, more or less is the same but just alot stronger i will be running my current engine at 2 bar of boost, anything over 350 i'll be happy with but how much power can you gain with an extra 9 psi? Now i am running 750cc injectors,s8 ecu coil pack, spoon style inlet manifold with 45mm jam jets,three inch down pipe,its an 2.0 litre now where as before it was a 2.1, newman cam dialed in by brom. i am also running pumaracing top spec 45mm valve head with his own double valve spring system.,i'm going to a rolling road shootout on march 12th @ engine advantages so will find out then



my old engine on weber management

Rossco

Care to shed any more on that??

Red16