COLEYST200

iTrader: (3)

As the title says wots needed for a 500 BHP
cosworth yb motor . Like head mods / cams compression and so on

Caddyshack

My standard engine would do 500bhp with the safety of long studs and the best intercooler that can be bought.

I have looked at this a lot and the norm is pocketed pistons, head flowed to the spec of the builder. And I am pretty sure one of the cams is swapped and bd14 or 16 rings a bell.

I think the belt and braces but expensive route would include an arrow crank and suitable rods.

The block needs long studs and oil squirt jets, you have the big wing sump already I think.

Of course an Efr 7064 and twin scroll manifold make the job easier but gets pricey.

I assume you already have a 3 inch down pipe?

1000cc injectors make sense and have a lot of redundancy built in.

Hart inlet helps too.

As your car goes on track a lot I think you really would benefit from the intercooler but the best is very expensive

jontysafe

A good tuner and a large wodge of notes!

Caddyshack

Spec r is the intercooler of choice

COLEYST200

iTrader: (3)

Thanks for the replys the more info I can get the better as I would like to get and do as much of the work my self to save the Ł . Yes I will have to send the head off for CNC porting and possibly over size valves . But bolting it together I'm more than happy to do that . It's getting the compression right that I might need help with . But all being well when I get to that time I'm hoping I might be a bull to call on Martin Hadland for that bit . As to getting most of the block worked on / long studding and so on iv got some very good places I can use for this stuff .

ajamesc

Mine had. 200 block long studs m.a.d spec head and cams. Small turbo inlet cover and throttle body 044 fuel pump 1000cc injectors gt3076 turbo and an sm4 ecu. Other bits as well like water injection to keep charge temps down 500 intercooler ap 6 paddle clutch. Mine ran 2.6 bar of boost and went really well felt very strong on the road. Everyone will have a different opinion and way of doing it but that's how mine was and that's an older style set up now lol

Caddyshack

Did you need pocketed pistons with the cam(s), I thought Mark only changed one of the cams on his 500 spec? I know he doesn't use water injection as much now due to better intercooler....at least I think that is the case.

ajamesc

Mine had standard exhaust cam and one of his inlets still have them there in my garage lol. I had standard rods and malhe pistons they had valve cut outs. I sold my water injection set up so I'm hoping I don't still need it with the new intercooler lol

Mark Shead

Cams are dependent on what turbo is used. I pocket all pistons even if stock cams are used.
Used water meth mix when low octane fuel is only avl.

Mark

COLEYST200

iTrader: (3)

This info is starting to help me out as I was planing on using standard Pistons and iv all ways had my Pistons pocketed as iv all ways run BD cams and as even standard Pistons can get kissed by the valves it make for a safe motor to pocket them .

wots all so the Best size and spec turbo to use with out ringing the turbos neck to get the 500 BHP out of it . And good for track use

Caddyshack

Ian, even Rods car ran standard Valve sizes, I wouldn't bother.

COLEYST200

iTrader: (3)

thats one more tick in the box then

ajamesc

Best bet would asking your mapper or engine builder for turbo compression ratio cam and injector choices

jamie956

I'm now in the middle of doing this aiming for some where In between 500-550 this is what I'm going for,

200 block long studded, piston jets, big wing sump.
4x4 head, ported, matched inlet, 2x cams, double springs, solid lifters.
billet swedish plenum (due to space restrictions) 1000cc injectors, t6 ecu.
Harvey gibbs new spec gt30
probably going for water/meth injection as it's mainly drag racing I'm in to.

I really wanted to go down the efr road but it just wasn't going to pan out with the limited space I have, as I am heading more towards the drag racing I decided to go with a Gt as spool up isn't going to be such a big issue.
​​​​​​​
I think to get the best out of what ever you do you really need a engine builder to put it all together getting all the compressions equal and the cam timing right is what's going to make or break it.

Caddyshack

What car is this on? We got an efr in to the engine bay of a 205 gti with some room to spare.

As you say, spool up is less of an issue on a drag car as long as you can keep the turbo spinning during gear changes

COLEYST200

iTrader: (3)

Wots ring with using the standard oil spray bar that ford made and works so well ??

Caddyshack

I think the better one sprays the underside of the pistons to cool them....it's a bit like saying what is wrong with the t3 or the standard intercooler....it was built as a naturally aspirated engine and last minute turboed for 220 bhp, if you want more power you need to change a lot, especially at 500bhp from 2 litres

jamie956

It's on a MK2 cortina but I have a spaced framed front end with narrowed suspension top mounts, it's not impossible to fit one just to much hassle for me taking the car half way across the country to have a custom manifold made,

hopefully my gearing is right so should drop back into the power after gear changes, the turbo makes full boost at 3250 rpm and made 550 hp and 455ftlbs.

Caddyshack

That is good boost at 3250 and healthy figures. What rpm are you at for 550 bhp?

ajamesc

I was told I don't need spray jets with a standard crack. Obviously no harm having then just an extra expense and more block machining Best to ask your engine builder what he likes to do or says is ok or not.

jamie956

not 100% on engine spec lead to belive it was on a ported head and Harveys own cams, 553 @ 7k and 32 psi @ 3250rpm pretty much holding that boost all the way.

Adam-M

Would be interesting to find out more about this, what was the reason for ford fitting under piston spray in the small turbo engine?

jamie956

I belive the jets give a better piston cooling as it more of a direct spray on to the piston over the spray bar.

graham c

iTrader: (5)

Choose your mapper and ask them I use gt3076 15/16 cams ported head 500 cooler 83lb injectors pockets but standerd comp hlf mapped it made 400 hp@20lb boost so 500 should be fine

Caddyshack

The efr would monster the gt3076 if the budget allows this and a manifold to suit.

I switched to low boost today as at 4000 /5000 rpm on high it was beginning to spin the wheels in 2nd n 3rd, the low down torque is bonkers.

turbotrev

That will go like a rocket mate!

Cheers Paul