wayniac

first question would have to be.... is it worth it ?

Im not so much bother'd about the work involved, more the point about choosin the correct parts so they compliment each other.

I got all sorts of questions and things Im not sure of.... mainly bottom end stuff, so I'll jsut reel loads of shit out and see what kinda answers / replys / advice comes back.

at what point would you need to fit oversized pistons ? is 0.5mm gonna do anything, or does it just make for a fresh snug fit after 15 years of thrashin out your old block ? ( after re-bore of course )

while on pistons... flat, unfinished pistons, can these be machined to set spec or do you need to know what cam / crank / con rods are to be used ? how or who would spec your unfinished piston to a finished piston ? again, brings me to the "is it worth doin it diy?"

con rods... what point would these need to be steel ? what kinda power would / could the STD units fail givin that they are of sound condition.

would an aim of 230-250bhp need all this bottom end work, or is it a lil too over spec'd ? or is it better to over spec and increase the reliability side ?

also, while Im here... what makes for good torque figures in a 1600 ( or close as ) CVH ?

cheers for read all my shite

Wayne

wayniac

up fookin rapid this place... only bin up for 20mins or so and nearly off the page !

CozzyBrom

i will help ya mate

wayniac

its mainly the spec thats doin me... I dont wanna go an spend shit loads on uprated kit thats just not needed

cheers tho never turn it down.

wayniac

any ideas... ??

I get the feelin brom thinks Im fookin thick ?

CozzyBrom

i aint been on line all last nite mate
giz a ring what your looking for

zvhturbo

If you aint done it before take to to someone who knows what they are doing.

forgetting to check or tighten something to the correct torque could distroy Ł3K worth of your money.

But planning exactly what you want and getting a written quote before going ahead with the works will save you money.
Don't turn up, drop the engine off and tell them to rebuild it with loads of trick parts as they will just be rubbing there hands togeather charging you Ł30 an hour day works + materials

Matt.

CozzyBrom

wat the fuk are you trying to say ???????
i done around 10 zvhs now and loads of rsturbo builds i had a zvh 10 yrs ago then ht racing 1st used to do it

Stu @ M Developments

iTrader: (12)

What was that in aid of?

CabrioTurbo

If its had 15 yrs and prob 100k of thrashing then you may as well go for a rebore 0.5mm is the norm although i have gone 1mm due to scoring of the bores.
It will basically make that part of the engine like new again (execpt for corrosion in the bore walls which cant be helped)

Yes pictons can be machined to a set c/r (i bought accralite ones and had burton machine them down)
And yes you would be better knowing your final spec before you have a sit load lopped off the top of em

Circa 250 Bhp (i would allways replace the old rods with new std ones at least!)

Allways good to have a nice bottom end so more power can be achieved with out taking the engine to bit every 10 miles

A shit load of boost and a propperly speced engine!

IMO DIY is good for the CVH engine, obviously there are thing you arent going to do yourself like balance/regrind/polish the crank.. however the actual putting together of it is childsplay. (were you any good with lego ? )

For a 250 Bhp CVH my basic spec would be this. (using mainly off the shelf parts)

rebore (if necessary) 1600 block.
New forged pistons and rings (id go with accralite personally cant fault them in mine) with 7.6:1 compression ratio
Fully balanced bottom end with reground/polished crank and suitable Heavy duty bearings
Standard main bolts
A.R.P Big end bolts
Either new STD con rods (on limit) or steel h section rods
'Stage 3' hybrid turbo (.48exh .55 comp) although prob very near its limit @ 250Bhp
'Stage 3' big valve head Ported and polished IMO is only good for arround 220bhp MAX
Piper 285t cam
5th injector
and probably arround 25Psi

there are of course incidentals such as plugs (arround Ł100 ) zorst, filter, hoses etc and finally a suitable chip (turbosystems will remap your ignition ECU for arround Ł175)

Anyway hope that helps if you want anymore help give us a shout
CheeRS
Phil

zvhturbo

Are you talking to me cozzybrom??

I was not saying you don't know what you are doing ~ Wasn't even talking to you.

I was telling waynaic to take it to someone who knows what they are doing and not try it himself if he has not done it before.

Was trying to give him some advice from personal experience to plan and talk it through with engine builders before rushing into things.

Matt.

CozzyBrom

well from the way it looks to me our saying me
i offerd to help you come back with take it to some 1 that knows what there on about
i carnt map cars but i know how to build engines

zvhturbo

Your reading it all wrong mate.

I was simply telling him to not attempt it himself if he has never done it before and leave it in the hands of a engine builder like yourself.

Matt.

Stu @ M Developments

iTrader: (12)

I agree Brom, he was replying to teh topic starter mate.. you paranoid loony

wayniac

thanks guys

RE: take it to someone else... that kinda kills half my plan, Im gettin bored with nothing to do, sooooooo plan is to buy an escort turbo, nothin fancy but solid, then build another engine at my leisure. Im tired of all the loans and payments an shit that goes with it. so, I'll be debt free and build the engine myself, if theres something else needs doin or spending on (usually the chik ) i can hold the engine parts buyin off for a week or wotever and sort other things. Takin it to someone else usually means one BIG bill at the end, wheres the fun in that ? savin like fook for however long... and Im still not doin anything myself... thats one of the main things I like about these cars... so easy to work on. i aint afraid of bit of work and Im not know for missing tiny details when workin, so DIY building aint a problem for me it was mainly the spec, as above, I dont want to go and pay 600 odd quid for conrods that just are not needed.

its always nice to have the best of the best, but usually it just isnt worth it.

Phil.. bang on answer... thats the kinda info Im after.

its ok to ring round tuners and ask advice and wot to fit etc etc... but i see it as they're there to make money, business innit... I owuldnt like everyfooker ringing me all day askin how to re-wire their house... sure id run thru the basic's quick, but details ? Im not interested, Im not the fookin big book of electrical how-to, so I dont expect anyone else to be the big book of DIY CVH for me hence the public question/discussion.

thanks again

Wayne

Stu @ M Developments

iTrader: (12)

Here's a nice DIY CVH engine.











Ive just "Done It Myself"

wayniac

i was thinking that as soon as i saw the first photo !

Stu @ M Developments

iTrader: (12)

Sorry mate... it just came to me and i saw it as cheap easy amusement

Im sure between all us members on PF you will get some pretty accurate info on what to buy yourself for this engine... dont worry

wayniac

cheers matey... I aint startin next week or anthing, but I like to plan what Im doin and have a good idea of what to expect etc etc.

Stu @ M Developments

iTrader: (12)

This entire engine will depend ONLY upon your budget and projected horsepower so best you pluck us up a figure to play with here.....

Will you be shelling out for these puppies for starters?




Those items can cost more than a whole rebuilt engine so dont buy em unless you may need em!!

wayniac

this is it....... this is what I wanna avoid. loads of dolla when it aint needed.

Iv got here a burton catalogue...

crank 1400 quid !!!
pistons 100 quid each !!!
rods 175 quid each !!!

I bet that dont include shells and the rest or whatever is needed !!!!

what kinda figures would you be aiming for IF you where to install these few items ? keepin in mind you'd stick to 1600cc (thereabouts)

Id be happy with a reliable 230ish, nothin too close to its limits if possible ?!

zvhturbo

If its 230 your after mate then what you list above is not worth the money.

A good set of shotpeened rods and a low milage crank will see you with 230 for the rest of your days.

Pistons i would say are worth the money though IMO.

New oil and water pumps, new oil pick up pipe and its worth replacing the sump.

Get rid of the dodgy old oil cooler as well.

A decent cam, bigger intercooler, and a good set up will see 230.

wayniac

oh no.... I aint goin for no crank at 1400 quid..

Im not tight but Id want 900bhp instantly from that fooker !

zvhturbo

I don't think i've ever heard of a crank failing.

Steel cranks i think are stronger so therefore can be made with less meat on and therefore lighter.

What have you done to your car so far??

Is it totally standard?

You aint actually told us what car it is yet?
I assume its a S2 Turbo?

Matt.

zvhturbo

I reacon the best thing for you to do is to take the block in to your local engine builder and get them to rebore, regrind crank and get them to refit the crank with new bearings etc, check the face of the block is straight.

Really thats the only bit you can't do.

Make sure he tells you what size it needs boring to and make sure you can get pistons that size.

Take new pistons and rods to them and get them to fit the pistons to the rods (if the pins don't slide in (they will be tight to either the piston or rod but not sure which)

You can then re-fit every thing else ~ oil pump, water pump, oil pick up, sump, flywheel, seals, etc.

Get the head checked for straightness then refit it with all the new valves, cam etc.

TIP ~ don't fit the followers and rockers until the cam belt is set up and fitted correctly or you could easily bend valves.

wayniac

yeah, I aint got nothin yet... this will be the 5th (and fookin final, so Im told) escort turbo, so I wanna go for a total rebuild. I got plenty of space so woprkshop and tools aint a problem. just doin a lil research before anything gets done. I dont wanna get part way thru, then hit some stupid obstical that I should have thought about 2 months ago. it would be a fresh install... everything else from new (IC, cam, and so on) then either sell or put the old engine in the corner ?!



plenty of room especially with no car in there.

wayniac

nice one... you never in when i come over tho !

CarlRsT

How brews u had . . . . . . theres 3 empty jars there

Hansenturbo

wayniac

sounds fookin good that one

wayniac

Up for any ideas on a spec for high torque....

JesseT

High comp with a lean-burn head?

wayniac

whats a lean burn head ?

is that a stupid question ?

JesseT

hemi type cylinder head:

lean burn head used in 86-90 carb engines:

Eagle

iTrader: (2)

i did a diy on my old escort... was running a happy 22 psi when i sold it .. and i saved alot of cash by doin it myself too