R6Franky

iTrader: (2)

Hi,

Making good progress, just pistons to buy. Who runs their 1.6 with a 1mm overbore i.e 81mm. Just wanted to ask if there has been any problems with removing this much material from each bore.

Aiming for decent power, 250-300. and don't want to risk weakening my block by removing too much. Should I just take it to 80.5mm??

Thanks
Dan

rs shawn

My S2 only had 0.5mm overbore.
Not sure if piston prices are anymore for the bigger ones or if it would take too much off? Why are you going 1mm oversize?

R6Franky

iTrader: (2)

Hi mate,

To suit these:

http://cgi.ebay.co.uk/ws/eBayISAPI.d...8547&rd=1&rd=1

I've put up other posts about the piston and seller but noone is replying, think I'm going to buy them anyway. The seller assures me they are manufactured by wossner.

Dan

Tony Turbo

Are you really sure you want to spend near enough Ł500 with so little information on them? Why not spend another Ł50 and get something custom made by a quality piston company. Then you will know exactly what you are getting.


My 2 pence worth...

homer j

iTrader: (1)

i got some 1.5mm oversize pistons to go in mine so i'm deffo hoping thats not too much to take out

Rick

+1mm

Driven daily, done 40 odd k, 2 bar plus boost.....

You won't have a problem. The block is very very strong.

R6Franky

iTrader: (2)

Like whom??

I'm all up for that. From the posts I've read all there are cvh wise is Ross (Ł600) from the states, Genuine Wossner (Ł500) from germany, Possible wossners (Ł500) off the ebay guy, Cosworth (ŁŁŁ) Rocking horse shit or Accralite (Ł500) from burtons but are only 8:1. If I'm buying forged pistons there's no way I'm having them skimmed.

Aiming to build a strong an engine as possible (low comp) so I have no worries in the future when making other mods for more power.

Spec for this year: BOLD, items need to buy

1600 CVH
Lightened/balanced bottom end
Shotpeened crank
Low comp pistons
Steel H-Section Rods
arp conrod bolts
Stage 3 Big valve head
Newman Cam and solid lifters
2wd Cosworth T3 Turbo
-31 actuator
pro alloy front mount intercooler
Alloy rad
Air filter
Ap organic clutch
OFAB EFI Management
Beige 701 Injectors
Magnex 2.5" Bore Exhaust
New Ford OE Oil Pump
New Ford OE Water Pump

Dan

homer j

iTrader: (1)

rick, just had a look and see you got cosworth pistons but just wondering, what conrods you got in there?

Rick

Farndon.

JamboRS

you wont get 250-300bhp on ofab with beiges
so id be putting that in bold too

R6Franky

iTrader: (2)

I already know the management isn't capable of producing the power so will be the 'future mods' I was talking about. I've said that in my resto too. But I want the strong engine for when I do get a decent set up, along with a better clutch before you say so...

Dan

Red16

the management is fine, its the injectors that wont supply the fuel for that power level, the beiges will max out around 230bhp

scotty86d

use 8.1:1 and get the rtuner to retard the ignition at high rpm. im going to be running 9.0:1 on a zetec turbo in the future

Arjan

ive done a 2mm overbore,(+88 stroke=1858cc) which is 1 mm either side,the cvh block is beefy so Im told by the engine builder who did the rebore. he's done alot of cvhs including about 40 long stroke conversions running +220 bhp using a 3mm overbore with no problem.

steven botes

im running 80.895mm without a hassle. the cvh block will easily take it

R6Franky

iTrader: (2)

Champion,

If I'm lucky with a recent pm I may only have to go to 80.5 after all with a set of pistons.

Dan

Lee Reynolds

Bump for an old topic.

I cant find 82mm pistons for the CVH but ive read they have been used! Anyone know?

gus

iTrader: (1)

i think the max you can go is 86mm

russ rs

So what's the best piston and comprestion to use

J1mbo

iTrader: (1)

I have some wossners for sale, STD size keeping maximum strength and linered the block they're mint done dyno work and a hundred miles if any ones interested

Made 303bhp on my engine too!

essexRSTSouthend

If 86m is fine... then why do pec only supply up to 81m....

http://www.performanceenginecomponen....asp?id=250258

Canada1

You will hit water well before you get close to 86mm bore.
The cylinder wall thickness is paper thin at 82mm.

essexRSTSouthend

i thought so.

gus

iTrader: (1)

my bad

im getting confussed with different chats i have had

jonny s2

iTrader: (12)

i wouldnt personally run over a 1mm if going for big power tbh

jimbo where can you get liners for cvh blocks

J1mbo

iTrader: (1)

We use lyndale in Peterborough for mine and they supply and fit them!

essexRSTSouthend

Thought they called sleeves?

Rob_DOHC

iTrader: (4)

Same difference.

Thats really interesting Jimbo, wish i had thought about that when i was building mine!

Rob,