bigkev

hi guys ive bought a silver top block bored out to 2.1 breathers fitted. i am goin to zvh turbo this block. i ve heard there is a diffrence from black top con rods to silver top con rods, do i have to use silver top conrods for conversion with low comp pistons.

i understand gettin uprated conrods , so will have to get rods compatible with silver top , which i am unsure of, will i b able to buy pistons tht r a straight fit without skimming them for low compression ,

wow ive got a sore finger now,

first time engine builder although ive done bits n pieces to the 1 im running now, but had loads o probs with it ,

all info welcome guys

this site is addictive

jonny s2

iTrader: (12)

If your buying forged pistons and rods just buy ones for the silver top engine, company's like Wossner etc....do piston and rod packages suitable for cvh,zvh and full zetec turbo, just tell them what you require and what type of engine your building

juffer

Depends what budget you have. If you have decent management then your options are open. Me and a friend have identical bottom ends that were build for a few hundred quid and work well and do what we want. Im using a ZVH 2.1 and a friends is ZT 2.1. Just find a H/g to suit your compression.

The bottom ends are basically this:

Block bored to 86mm
Vauxhall c20XE pistons
Silver top rods machined to 21mm
Pistons drilled ( to allow oil to the pin)
8mm ARP rod bolts

My ZVH got 246bhp and my friends ZT got 299bhp.

bigkev

its cool u got tht all done
wats h/g mate

block ive got in my car the now has c20let pistons , its a blacktop zetec, block im building is silvertop was wanting to try n get good power from it, want to do it right, would like to buy purpose made bits for zetec turbo conversion, im getn my crank lightened n balanced want to get acralites or some other piston ready made n con rods ready done to but uprated, not sure wat make to get.

juffer

If your wanting forged items then do a search on here and many people have already done this. IIRC i think janno does a good deal on wosner pistons and pec rods.

There is not a lot of rods out there with a 21mm small end this is why the standard silver top rods are machined out. The black top rods can't be used for these pistons. If you do decide on using standard silvertop rods then i wouldn't use LET pistons because of compression. From memory they have a 13cc dish compared to the pressure cast XE items which have a 3cc dish. If your getting the crank balanced then i would do the rods and flywheel at the same time. How much power do you want?

I used a felpro head gasket.

bigkev

[quote=juffer;5647835]If your wanting forged items then do a search on here and many people have already done this. IIRC i think janno does a good deal on wosner pistons and pec rods.

There is not a lot of rods out there with a 21mm small end this is why the standard silver top rods are machined out. The black top rods can't be used for these pistons. If you do decide on using standard silvertop rods then i wouldn't use LET pistons because of compression. From memory they have a 13cc dish compared to the pressure cast XE items which have a 3cc dish. If your getting the crank balanced then i would do the rods and flywheel at the same time. How much power do you want?

I used a felpro head gasket.[/quote


im lookin to get maybe 280 at wheels a know thts mad but thts wat i want . the engine i have in the now is running just 187 at wheels . its been knock after knock with it i dont know if i would get away with taking the rods n pistons for my new block, the engine im running the now is a blacktop

im goin to get a multilayered gasket from sitech, hes a cool guy
good gaskets,

juffer

My advise then is to talk to your mapper and they will advise you at which route to take.

bigkev

i did tht today juffer, lol he has pistons n conrods there he will give me them for half price cool eh

thanks for all your advice mate much appreciated,