mike s2 rst

hi, im helping a mate rebuild a cvh hes just bought.iv just stripped it and found the block face to be in a bit of a bad way!!!it seems to be fairly worn between the bores.i was thinking of getting it skimmed but it looks like its been skimmed a few times already!so does anyone know of a good multi-layer gasket he could use or how i could measure the block??or any other ideas??

mike s2 rst

forgot to mention the head face isnt great but has also had the hell skimmed out it!!but should be ok with abit of wet+dry!!!would low comp pistons be a way to go or hes thinking of buying a used engine off ebay but im not sure thats guna b any better!!

Karlos G

iTrader: (4)

Take the block and head to a local engineers and get them to meassure it up and see if they are any good or not.
Low comp is a big waste of time unless you want silly power (eg:300bhp), will make it more laggy off boost.

mike s2 rst

local engineer has got the head and says its pretty f***ed!hes done quite abit with cvhs and says its one of the worst hes seen
im just cleanning up the block when i noticed its state!dont really wana go low comp due to lag and cost!its only going to be a standard re-build.
was wondeing would a decompression plate be an idea?i havnt much experiance with cvhs so any ideas welcome

Karlos G

iTrader: (4)

Lowering the compression is as I said above pointless, it has the same effect as fitting low comp pistons and will give you more lag!
It will be like driving a car thats done 250'000 miles on the same piston rings!

xr2wishy

iTrader: (2)

as above, you only run low comp when you've reached maximum power for a set engine potential, i've run over 200bhp on standard internals, as reliable as any other engine i've run too.
low comp is more laggy as said, plus uses more fuel also, basically needs loads more boost to get the best from them.
find a good known complete engine and fit it, you can spend a lot to sort a bottom end plus gaskets etc. just get a working engine for around Ł400 ready to roll.

Karlos G

iTrader: (4)

For Ł400 i'd rebuild!!
Shells/Bearings Ł80, Gasket Set/Bolts Ł50, Rings Ł85, Hone Ł50-Ł100?, Oil pump Ł25, Water pump Ł20.
If you want to do top end as well then add another Ł90 for a cam and lifters.
Job done!

xr2wishy

iTrader: (2)

for Ł400 i'd want a solid engine though, head and all.
not much in it i know, but then you've got a bottom end to work with for the future too and spare head for porting etc.

mike s2 rst

iv sorted all gaskets ,bearings and most other internals i just need to find a good block and head to put all the bits in!!!altho if the block is none in then maybe its a sign for zvh!!!!!!!!!!!!!

JamboRS

lag? with going low comp??

vroooom ptssssh

that's what I thought when I read it Jamie...

6.2:1 CR on a cossie doesnt feel any worse than a standard comp car!?

JamboRS

these few lines are worse,who buys rst's these days

vroooom ptssssh

But it's true, his mate down the pub said so!

Karlos G

iTrader: (4)

Do we really need to have an argument about going low comp making an engine drive less responsive off boost??
If you lower the compression of an engine from standard it will make less power/torque off boost than it did before, IMO this is not debatable! Even more so on a MFI RST where you cannot compensate for it a little with good mapping.
It's only done to allow bigger boost pressure to be run if your chasing big bhp figures, otherwise it's best to maintain as higher CR as possible....IMO!

jodyhoare

dunno if u have sorted this yet but i have a excellent block which i recently tremoved from my S" due to upgrade if interested

JamboRS

argument??i call it a discussion,surely u dont think im gonna not post when u say that low comp causes lag when thats a load of BS,ive never experienced lag on any low comp engine ive ever seen or car ive been in,maybe theyve been specced proper with right turbo etc,turbo choice causes lag not compression

Karlos G

iTrader: (4)

It's not BS, as I said above if you lower the compression of an engine from standard it will make less power/torque off boost than it did before.
The actual time it takes to spool up as you say will depend on the overall spec of the engine and turbo etc.. but if you drop the CR making the engine less responsive, dropping gas velocity, taking longer to reach the RPM at which the turbo makes peek boost (or even start to spool for that matter) it will make it laggier!
All i'm trying to point out to the guy is that it will feel slower, less responsive, laggier, off boost if he drops the CR and is not needed unless he's going for really big BHP.
Do you not agree?

jonny s2

iTrader: (12)

correct karlos,low comp engines are for less det to run more boost,on boost nice,off boost not very nice,hi comp turbo engine very responsive off boost

mike s2 rst

the thing is iv got all the things for a re-build but i have no block or head to build the bits to!!!

mike s2 rst

i know that if i lower the cp it wil make it lag more as said above.its not a big power build. but the thought behind low comp pistons was then i could skim the head and block so would even out the cp!but the head wont take anymore skimming so i cant do that!!

mike s2 rst

quick question are the block and head the same on an rs as on an xr3??would it matter if there escort or fiesta??thanks for any help!

jonny s2

iTrader: (12)

yes they are similar, replace the cam for a turbo 1,and the block will need a oil return in the sump,instead of the block,

Karlos G

iTrader: (4)

Cams are the same in all injection 1.6cvh's mate (Ford only has one part number for all), but yes the block will need a hole drilling if it isnt a turbo block.

JamboRS

no,ud never notice it on the road its that minimal,so the makin it laggy as fuk i still disagree
anyway am out,until u go away and test a std engine,low comp it then compare the differences then am not going to comment again