drift mekanik

I am building another YB engine as a replacement for my Nissan Silvia...
I am lookign for 500bhp ish.... maybe a little more. The engine is a 2wd setup.

I have just managed to bag some Cosworth Racing std size pistons at a good price to go with my arrow rods.

I have been advised to get some Newmans cams.. BD16 inlet and I forgot the exhaust side profil but..... by concern is with the BD16 anyway...

Question, I know I will need to double spring the valves but will I have issues with the valves hitting the pistons. The Cosworth pistons have a bowl but no valve pockets??

If this is a problem, can I have the pockets machined into the pistons? Or will the pistons I have got just not be suitable??

This probably sounds dumb but I have never modified a YB to this extent before.... I am used to 2JZ GTE engines!

JamesH

iTrader: (21)

Yes if running a BD16 inlet you will need to have valve pockets, you can get these machined cheaply into your pistons.

If you can use a 200 block, 6 long studs, multi layer steel head gasket, ported head would be nice, if not use a ported turbo shroud. A GT3071 .82 would give you good results on either! Don't make the compression too low, standard 8:1 is nice.

Use a standard exhaust cam, BD16 inlet would work well at this spec, you will need double valve springs, newman ones don't need to have the head machined. Pistons may not be suitable depending on the compression they will give, remember you'll loose a bit by having the valve cut outs too!

I see you're in Kent, get on the phone to Mark Shead

tabetha

Basically as above, but shop around a LOT for prices of doing the cut outs in the pistons, my prices varied from Ł45 to Ł172.80, for the exact same work.
The cut outs take so little CR wise from the engine I wouldn't worry about it, get it mapped on the rollers with a decent ecu/mapper and a huge amount of lag can be eliminated anyway, my CR is around 8.4:1 now to try and lose lag.
tabetha

Stu @ M Developments

iTrader: (12)

Good advice so far. The BD15 exhaust works well with that inlet and a big turbo.
I have most of the parts you need in stock too.

tabetha

For anyone interested I use B.E Randal, of Hepworth near Diss/Suffolk, 01359 251888 for all my engine work, anything and everything he does, but can be a little waiting time unless you tell him it's needed yesterday, don't whatever you do tell him there's no hurry, been there and made that mistake ha ha, work is perfection though, he will give straight advice as doesn't need to generate work, he's snowed under.
tabetha
mods, please note this is for information only, I have NO interest financial or otherwise with this company.

boost mad

iTrader: (8)

Stu, wouldnt a bd15 exhaust move the power way up the rev range and make the car worse off boost as compaired to a std exhaust cam?

drift mekanik

All sounds good to me.....

Anyone know what a GT3071 will set me back??

Miller 3

iTrader: (4)

http://reyland.co.uk/Details.asp?ProductID=73

Miller 3

iTrader: (4)

If you want more than 500hp tho id go for the GT 3076 either that or the new GTX 3071

JamesH

iTrader: (21)

About Ł1200 IIRC CR Turbos...

drift mekanik

cheers for all the help above. I have beem in touch with sutton rebore who i have used several times in the past. They can do the valve pockets for 80 quid which i thought was reasonable. They asked how deep they needed to be...

Can anyone help with this?

As above, i will be using a bd16 inlet cam, double valve springs, multilayer head gasket and my pistons are cosworth racing std size.

Miller 3

iTrader: (4)

Dont know about how deep but you can get the Cosworth racing pistons with cut outs already in them.



What comp ratio are you going?


Where abouts in Kent are you?

DAN400

iTrader: (3)

iirc 5mm on the inlet side and 3mm on the exhaust side

drift mekanik

I'm in Bromley

Comp ratio is yet to be considered. Pistons currently are std compression, they are direct replacements, just forged ones from cosworth. 7:5:1 I am guessing by the time I have had the pockets machined??? not sure really.....

Miller 3

iTrader: (4)

Are cool,
just saying as you can get them at 8:1 with the cut outs using a 4x4 head.

Do you know what head you have?

drift mekanik

Thats cool,

I have to get what I can afford. I am a drifter and so the car is track only, but also means its an expensive hobby and i dont get paid a lot from work.

The upgrades will either be done on a budget or in a sponsorship deal. I already have a couple of big sponsors on board..

MattLewis or MSD..??? anyone??? lol
Talking to Newmans directly at the mo as they are 2 minutes from my house!

The pistons are coosie racing and new but from a garage from a few years back, so were heavily discounted.

The head is a 2wd model.

drift mekanik

Right, Done some research...

The pistons I have just bought are 8:1 compression. made for the 4x4 so I will lose some compression fitting them into the 205 block... but that should be compensated by the 4 layer WRC headgasket and ability to run higher boost levels. I am sure I wont notice the suggested 0.2cr drop.

Miller 3

iTrader: (4)

205 block.. im sure it will be fine but rule of thumb is anything above 450 and your pushing your luck with that block as its better to use the 200 block from a 4x4 as it is thicker at the bottom.

dont know if you are aweare of any of this, just thought id make sure

drift mekanik

I was not aware but I am now.... cheers

I will keep my ears and eyes open for a 200 block at a "decent" price.

Miller 3

iTrader: (4)

All so the STANDARD Mahle pistons will do 500hp as they are a very good piston.

drift mekanik

I know about the Mahle pistons but mine needed some TLC. I have an odd set of 3 with the fourth being from a different set so I needed to get that sorted hence buying the Cosworth Racing Forged jobs on the advice of Mountune. This way I can get the whole bottom end renewed and balanced during the rebuild, knowing that all the parts are fully uprated. All for peace of mind.

Afterall my car will be spending about 8 hours a day at 7K revs bouncing off limiters on the drift track.

rsmark86

iTrader: (3)

if your doing it too you 2wd engine then theres 2 options either change to a 4x4 200 block or speak to someone like www.norrismotorsport.co.uk about wire ringing a 205 block.

you will need to have valve pockets machined in but try and keep standard compression as it will drive so much better.

then look at a gt3076 turbo i would recomend externaly gated / 83lbs siemens and at least a 4x4 inlet plenum with a spacer. but i would look to getting a hart inlet.

and get someone to port your head. along with the cams you have

and you would benifit from changeing the management to either aftermarket of at least p8 from a escort cosworth so can be live mapped to the car..... along with wasted spark coil pack set up

and a nice spec r cooler and breather system and it will piss 500bhp.

good luck mate


my car has 200 block, big pockets standard compression and a gt35 and runs 2.2bar and it flys and drives like a t34 car

drift mekanik

Cheers Mark,

All good stuff there. I have to consider options for the upgrades and the block appears to be my starting point.

Head work is already planned so thats cool, inlet plenum is an idea, I never thought od changing to a 4x4 inlet... I am guessing they have better air flow?

Turbo I am looking at is gt3076r now. I have heard loads of graet things about them on Driftworks too so think thats my angle!

About the management, you say the P8 is the way to go, thats cool but is it just a plug and play into my engine loom? I have the 2wd loom from a saph.

I do have to think about a budget too, as I am far from rolling in it!