-beefy-

iTrader: (6)

been doing a spot of reasearch into big valve cvh heads for my 2.1 project ,

now i know theres the head with the cross hatch cast on it and that head will accept 45mm inlet valves ,

but im hearing conflicting reports about increasing the size of the exhaust valves ??

some people are saying there too big as standard and should be left at that size ( upgraded to stainless )

yet other people are saying they should be opend out with a bigger exhaust vale fitted for max flow ?


so who the fuck do i listen to lol , even the cpl tuners in spoke to recommend diff options ,

will the fact im going 2.1 mean i need bigger exhaust vavles ?

obviously this is in conjunction with a havily ported head and newman cam solid lifters double vavle springs ect ??



opinions peeps , what you big power cvh lads running head wise ??

-beefy-

iTrader: (6)

bttt , come on peeps ??

TIFF

This is one for the NMS CVH boys

Rick

if it's a 45mm valve, make sure it's made of unobtanium, as you WILL drop one...

-beefy-

iTrader: (6)

yeah , be nice if they answer lol.

-beefy-

iTrader: (6)

why u say that rick ???

Garage19

Eh?

Do you mean titanium and why will he drop one?

Alot of bike tuners are taking the stock tit valvs out of bike engines and replacing them with traditional stainless ones when they tune the engine as they have found the tit ones un reliable / less duarble.

I theory the tit valve should be more reliable due to the lighter weight, less reciprocating mass, less forces but certainly with suzuki made ones it doesn't seem to be that way at the moment.

As for the ZVH engine..... i always think they are a waste of time, effort and money as you have taken off a perfectly good 16v head that flows better than the one yuou have puut on in the first place.

But if i was building one and it was a 2.1 i would fit bigger valves and port to suit on both sides. The 1600cc engine could barely breath through its stock valves so add another 125cc and i think it will need all the help it can get.

Red16

i know this is no help to your question but... why not just go full zetec instead?

LEE-RS

Turboboss off here made 428 bhp 2.0 zvh 45mm inlet vales standard exhaust valves

-beefy-

iTrader: (6)

why did i know u were going to say that ??

dont get me wrong i could be tempted to go 16 v ,

just after soemthing with alot of toruqe and ive been told the 8v headed 2.1's are better for tourqe than out and out bhp .

i could be wrong ,

its happend before lol


garage 19. how does the standard head struggle to breathe , when the info on the exhaust valves is based on staying on the 1600cc capacity ???

AndyKam

iTrader: (2)

Go for a full 16 valve zetec if you are starting from scratch. I think a ZVH is better suited for those who already have a big spec 8 valve head which you can transfer straight over to the Zetec block.

I run a 1905cc NMS CVH with Karls spec cam and valves running about 320bhp and 350 ft/lb with a T34. Dont ask me what size valves its got. I just drive it.

-beefy-

iTrader: (6)

yeah i know mate and over 400ft/lb f torque if i rember rightly




hence why im wondering why i need to got 16v when a 16 v heads going to cost me more , than what seans cost

Garage19

400 ft/lb of torque low down is not what you want in a fwd car. It will be total crap to drive.

How can a stock mk2 mondeo head cost more than a worked over cvh?

If you want more performance still you can pick a st170 head up for about £250 and i expect that that will outflow most worked cvh heads without a problem.

-beefy-

iTrader: (6)

stock mk 2

silver top or blacktop ???

ive never had much intrest in the full zetec route thb , not saying i wouldnt be against it ,

just wighing up the price of a worked 16 v head cams ect got to me alot more than a worked 8v,

and surely its driveabilitys down to the way its mapped ?

but im looking for low down grunt ,

the box i got in mind should be able to take the power ,

jacko

low down power is good but you can have too much of it way to early on a front wheel drive car

the rs turbos have no grip of the line and throwing more torque at it will make it worse your best bet is just buy a focus rs motor and bang it in job done thenyou can mod it from there

-beefy-

iTrader: (6)

but if the cars set up properly , suspension wise it will get grip .

granted 400 ft.lb its never going to be easy , im not necassarly aiming for that just want somthing with a bit of grunt ,
.


and you of all people should know 300 ft.lb aint undriveable in a fwd car

just look at grahams jacko ,

yea its got torque steer but it dont spin

its all about dialling it in properly

jacko

its got nowt to do with set up mate yeh grahams goes like stink and its got a proper zvh in it but its 6psi try driving it when its at 28 or so then tell me its useable a car like that will not get grip before 30-40 mph

better ow with more power than torque in a fwd if you did it rear or 4x4 then you can throw loads at it an because of where the drive is given it will grip

the only way you can do it with a fwd car is droop limiters and have the rear suspension as stif as pos

-beefy-

iTrader: (6)

so you recon its got nothing do do with supension set up ????

jacko

it will get a bit more mate but its got no where near as good a chance as r or 4 wheel drive cos it still lifts the weight off the wheels under load

-beefy-

iTrader: (6)

i'm not debating the fact rwd or 4x4 is going to have more grip jack ,

what i'm saying is that with a well set up motor and a well setup suspension,tca's equal length driveshafts ect torque steer can be massively reduced ,almost to the point of none ,

wich would mean a big power fwd car is just as useable ,

It's Czech Mate

http://www.pumaracing.co.uk/CVH.htm

jacko

how you going to put equal length drive shafts in a fwd escort mat when the gear box sits to one side

It's Czech Mate

Check out a mk 5 fiesta zetec-s, two equal length driveshafts with a 3rd shaft in the middle, nil torque steer.

-beefy-

iTrader: (6)

fuck me jack you behind the times or what ??


im not planning to run the bc box , im going to run a st box ,

it runs a two peice shaft to the driver side which crates equal length shafts ,

very similar to the mtx75 setup .

same way graham was going to go and the way karl is going

much better in every way to the bc box

-beefy-

iTrader: (6)

hence why i won a pre 86 cast head on ebay eairler lol

-beefy-

iTrader: (6)

great minds and all

jacko

realised after i sed what i sed cos the new minie is like that

gus

iTrader: (1)

equal length shafts has been done in both new and old fwd fords

-beefy-

iTrader: (6)

hence why torque steer aint a prob


hows the car coming along gus ?


what new one jack ??
didnt know ur were running a diff box ?

thought u had a s2 box to go in ??

gus

iTrader: (1)

its getting there


should be done soon


ifn the dude building it would stop painting, polishing and cleaning as he goes

jacko

http://cgi.ebay.co.uk/FORD-ESCORT-RS...QQcmdZViewItem

thats what you need mate

jacko

i ment new mini,s mate

Shings

Run a mile.. thats Spadges old one- it hit something very big and very hard.


SIDE WAYS



As for 8v heads NMS is the best place to go for one... but I wouldn't count on the secrets being let out- Karl works hard to obtain the power and relaitive reliability out of em- and as for PumaRacing - thanks to recent threads.... PMSL

-beefy-

iTrader: (6)

thought i reconised that car

telepone pole wasnt it , he was only poping to the shops or sumthing ??

whats wrong with puma racing shinings ??


beef

Turbo Zetec

iTrader: (1)

i think he may be getting mixed up with pumaspeed?

-beefy-

iTrader: (6)

yeah must be md ,havent head bad reports from puma racing

-beefy-

iTrader: (6)

so bk on track guys ??

what are my options with my cylinder head ??

It's Czech Mate

Puma Racing isnt Pumabuild Jake

He knows his shit

over 400bhp and 400ftlbs from a zvh is no mean feat and he builds some great engines. That site is a usefull resource for both cvh and pug gti tuning

-beefy-

iTrader: (6)

true . s sites very useful , and some gud info

think im going to go fr one of his superdupa heads ,

mitchrst

If you think torque low down is not good just check out turboboss's 100 - 150 time will beat most 16 valves with the same bhp