petermintrst

What are the differences internally to a n/a cvh from an xr3i and an rs turbo engine.

Reason I ask is that I have an xr3i engine that I will be rebuilding and I wouldnt mind rebuilding it into an rs turbo engine. As the block and cylinder head are the same physical size surely it is possible....is it?

thanks

peter

Chris69

i'm pretty sure the block is the same but obvio the pistons are lower compression mahle items.
i've heard the valves on the rst head are slightly differnt (surface coating or somthing but tbh i don't think thats a big issue.
not sure if the rods are differnt etc

addiction

you'd also need to drill a hole into the block for the turbo oil return pipe

jonesymk2

iTrader: (2)

the erst crank is slightly different,the erst uses different big end bearings i think aswell,pistons are different for lower compression,xr3i block has to be drilled to take turbo oil return,there is something different on the heads but cant remember what it is,as far as i know thats the differences

petermintrst

going on the comments (thanks everyone) it might be less hastle just buying turbo engine to rebuild

Billy_RS

iTrader: (5)

I'd rather use a RS turbo engine. You can get them on eBay for decent money

jonesymk2

iTrader: (2)

yeh that would probably be your best bet mate

orion turbo

rs turbo exhaust valves are sodium filled (n/a cvh's are nimonic)

8.3;1 comp ration (n/a 9.5;1)

secondary oil rings are tapered

beefier gudgeon pins

main bearings are uprated from xr3i spec

retarded cam timing by the fitment of a 1.3 cvh cam sprocket

sump had oil return

xr3i and rs turbo k-jet and ke-jet are the same the E in the ke only means electronic control of the cold start valve and period

petermintrst

you sound like you know nothing about engine....






cheers for that

orion turbo

is that sarcasm

every single car except 2 has been cvh

petermintrst

sacasm.....yes


how many cvhs you had?

And for my next question....if I was to buy an rs turbo engine and replace all shells, rings bearing, re grind crank etc etc with standard parts...how much would it cost roughly (for the parts)

orion turbo

cvh's have to guess at something over 20

the shells and rings ect. are not that expensive and the crank work wont cost a forture butit depends who builds the engine?

petermintrst

an cheap amateur would fit it together but the regrinding/honing would be done by a proffessional.....then when it goes bang the minute i turn the key

MarkN

I had my Mk3's original engine rebuilt as a turbo block back in May. I got the CPS hole drilled at the same time so that I could run FRST management.

Be warned though - the NA and Turbo block castings are different. The turbo block has extra metal on the inside where the turbo oil drain hole is to "point" the oil straight down into the sump. When you get a NA block drilled the drain stub just pokes through the wall and the oil runs down the inside of the block.

I converted mine because I wanted to keep the original engine number. I also got the bargain of the century with a new set of pistons, rings and shells for Ł20 of ebay. Made it a no brainer really rather than buying some unknown RS turbo block that could turn out to be a pile of crap...

whitneyd

Is ther any differences in the Fiesta turbo blocks and the Escort turbo blocks??

MarkN

I don't think so apart from the CPS hole that most Escorts don't have.

The fiesta block also has a threaded oil drain, but this is not technically part of the block and can be extracted and replaced by a t3 version...