cosworth yb naturally aspirated

[tvralfagtv6]

I am doing a NA pintworth conversion i.e using pinto 205 bottom end and cossy
head. I have got bd 3 cams hydraulic followers and the standard flat top pistons,
has anyone done a similar conversion and what power did they get?
I assume the hydraulic lifeters go pete tong at about 6000 and that solid lifters are needed after that. I believe fiesta diesel ones can be used with a bit of mechanical ingenuity but which fiesta diesel? how much do they cost?

Background.

I want good solid performance all round the dial.not just at the top end.
I have been told that the 205 bottom end is good for 7000 and my change point and gearing/ mechanical synmpathy is suited to about 6800.
The motor is in a seven and with the standard injection motor on twin 45's it feels nice and surgey even if very limited revability and is deceptively quick for a standard cam / head.

185-190 bhp in a seven is the holy grail for me 150-160 reliable tractable horses with a nice high tec'ish exhaust note is my initial sights with upgrading to forged pistons and fully ported head to get the last thirty or so horses.

Any advice on skimming decking expected compression ratios with flat toppers instead
of the 600quid domed ones that i know i should have. Any one driven a normally aspirated
what do they go like? etc etc.Any info welcome .

[chassis 33]

It might be worth speaking to Richard Moore at Moore Racing www.moore-racing.co.uk/contact.html

They've done loads of the Turbo Tasmins and end up giving engines a fresh lease of life as NA spec engines.

Regards
Iain

[chuntington101]

why not go the more conventional Zetech route???? its very popular cos its easy and cheap! i think a basic direct to head throttle body set will give you 170-180bhp on an ontherwise stock 2.0 ltr motor!!! also it will way a lot less than the "boat anchor" that is the pinto/cossy!

you could pick up a sracp 2.0 for about 600 quid i think, or go for a brand new one from ford for around a grand!

just my thoughts.

thanks Chris.

[tvralfagtv6]

right well i have ordered the des hamill book so hopefully that will answere the questions ref the zetec considered it , but i did a rough calc and when you add water pumps, modified sump clearance for 2.0 flywheel , water take off, and at 350£ an ignition system your 200£ motor from the scrappy starts to look at about 700£ now my pintworth appears on course for a similar amount and although I hated the pinto I sort of like its unburstable bottom end, not saying the zetec is any less strong ..i don't know.It is heavy but the motor is 6inches from the floor max and nearly 2 foot behind the front wheels, the weight although an issue on paper is not noticeable, plus all the spring weights and roll bars are adjusted for it. If i were starting a new build yes i agree but the cosworth name under the hood has a certain wow factor in itself, plus a cosworth on carbs is a fairly pistonheady sort of thing to do?

[donkeasy]

Hi,

I drove that normally aspirated engine in a seven years ago.

Never whit hydralic cams had more than 165 hp. (proper build!)
Which was little hp for a lot of money. To low revs for hp

I also drove with steel followers, which was a lot better.
They were called L1 cams and had 304 degree 46/78 10.51 mm lift
But still not more than 200hp. The mahle pistons were gone in no time.

Than builded it whit 2.2 engine and had 240HP with 200Nm.

That crashed, so I have still al the parts laying around.
Wanted to build it in a (lotus) cortina, never happened.

Somebody interested?