Cosworth Yb turbo

Spent a few hours on the car Engine last night.

As a background I was racing with Special Saloons last month and managed to cook the head gasket.

Ive had the head skimmed got a new group A head hasket Cambelt and tensioner.

I needed to tackle two stripped threads in the head last night both of which are bolts that hold the cam caps in place so they are quite important.

As the head is back on the engine I had to limit the swarf getting every where in the head when I drilled it out ready to accept a helicoil. One trick that has served me well in the past is to fill the area that you are drilling with shaving foam. This catches the swarf as you are drilling and allows you to simply just scoop it back out.

ive also managed to get some light blue injectors that coupled with the current turbo should allow 380-400 bhp after its re- chipped

happy days

So that's three of us with engines in bits! I wonder what that says about us

Oh Bollocks !!!!!!!!!!!!!!!!!!!

Just had a couple of Days in Sunny Weymouth. Had the Fezza running briefly before i went and noticed it was belching a bit of white smoke. Fired her up again tonight all was well until she got warm and started belching white smoke again.So i whipped the turbo off and this is what i found.



exhaust housing wet with oil indicating fooked seals ! Then it got worse.

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Compressor housing indicating Contact with wheel

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Compressor wheel showing damage





Exhaust Turbine again wet with oil

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What is strange the Turbo Had shown no signs of seal damage on the cars last outing , it was stripped down with headgasket failure.

I hope i can find a new core unit tomorrow or i will be out of Silverstone

Fingers crossed for you mate

Cheers mate ! I can get the parts and rebuild it myself ! BUT some people say that Turbos MUST be balanced others say they work just fine not sure what to do as an exploding compressor wheel going through the inlet manifold is a bit of an issue.

Fingers crossed by me as well

Not sure about the balancing requirement, I would imagine individual parts would be balanced to a set standard, but for ultimate performance then an assembled unit would be balanced again as a complete rotating mass. In other words the same as for a crank, front pulley, flywheel, clutch cover. Hopefully the manufacturer of the individual parts could advise if this is the case.

Well ive just bit the bullet ordred a hybrid with a 360 degree thrust bearing staggered oil seal billet compressor wheel and new everything ive been promised it for friday

im now officially poor and will dance for pennies at Silverstone

Hate to think what you will do for a quid

IAN51 wrote:Well ive just bit the bullet ordred a hybrid with a 360 degree thrust bearing staggered oil seal billet compressor wheel and new everything ive been promised it for friday

im now officially poor and will dance for pennies at Silverstone

I'm looking forward to seeing your car this weekend Ian so good luck.

Maybe Ed could sell off some of his spare (Spare) £20K wheels to help you pay for the Turbo, he would not miss them.

Lol cheers Bill it means im going to have a manic rush on friday night to get it together and on the trailer I hear Andrew Jordans jealous of Eds racing budget

Ian

Just to give an idea of the size of Ed's racing budget, at Donington he was buying bacon butties for the crows!

The fezzas overheating has bothered me somewhat. On the weekend qualifying and race one 1 saw the water temps climb up to 115 degrees c pretty much the maximum i would want to see. The other problem being that when the car went over 100 degrees a misfire crept in.

So after much head scratching ive retraced my steps. I fitted an Aluminium Radiator a few months ago and the problem has got worse since.I have never been convinced that sandwiching the Radiator , Intercooler , and Oil Cooler were the greatest of ideas and by dinnertime to day i had convinced myself that the fins must be damaged on the Intercooler restricting flow to the Rad ! So i came home tonight stripped the front of the car down to measure up for a different Intercooler. Then it hit me i think that i have stumbeled on the issue a classic case of not seeing the wood for the Trees.

The front of the car with the old radiator



Front of the car now ! When i fitted the new radiator i had to fit some 40mm spacers to lift the Radiator as it had a return lip on the bottom that the original did not. What i think i have done is to restrict the Airflow through it by pushing it farher up into the slam panel/

Red line shows the outline of the Rad behind the slam panel
Yellow show the outline of the Intercooler



Out with the Angle Grinder tommorow

I hope you can cut straighter lines than you draw

Nope

Managed an hour on the car tonight! I have finally had a chance to cut the slam panel. Plus i have decided to relocate the coil as it sits right next to the Aluminium swirl pot in the top hose.

I just need to start making some ducting now

Much neater than your initial design photo