So I have a Cossy engine that has had all the trimmings done to it:

SBD Tapered ITBs
Jondel race head that has been P&P'ed to a 1/1000th inch of its life Big valves, solid rockers, uprated valve springs etc etc
Custom cams
Wossner rods
Cosworth slipper pistons
Dry sump
Omex 600 management

It makes 232bhp @ 7400rpm with 7900 limit

I come from Honda engines so 7900 isn't a lot and I know I can get more by adding some revs.

Perhaps the best thing about the YB is that it is a good deal oversquare and, as such, piston velocities are low per given rpm compared to a normal 2 litre engine.

I'd rather not stroke it because of the cost - taking it to a 2.3 would mean looking at the £3k mark.

I was hoping that a set of cams would be doable.

Anyone any experience?

you could take it to 2090cc with 93mm pistons if your sticking with NA, or maybe even 94mm if your brave - that'll add a fair bit of torque and some power
(I've got 93mm forged ones for my pinto on cossie rods - they should be good for 8000 - 9000 rpm)

if the heads got solid followers in it you should be able to let it rev a bit more than that - the des hammill pinto book covers some of the options/limits

[Edited on 6/12/2011 by mcerd1]

Google cosworth YB tuning. There's info on cams there.

http://www.modifiedmonsters.com/t315-tuning-the-yb-cosworth-engine

You've got the right bit's in the engine, so it's down to cam's and rev's. The rev limit of 7900 is relatively low for the engine spec, but it depends on the 'custom cams'. Do you know what spec/timing/duration they actually are?, if they're mild/medium then 230/7900 is about right.

I have 93mm accralite pistons in mine, Kent L1/BD3 cams (which is a middle of the road set up), rev limit of 8000 and it makes around 220/230bhp. I'm planning on swapping the exhaust BD3 to an L1 and then raising the rev limit to 8500 or 9000 rpm which will make it far more exciting

Ian

Thanks for the replies!

I'll try and dig out the receipt for the cams to see what they are.

It idles at 800rpm so they can't be that lairy!!

I was thinking peak power at 8000 and 8500 maximum. I'd like to hope that offers some reliablility too.

As for the piston setup, i'll stick with the standard displacement. It's plenty torquey enough already with 175ft/lbs and the cost of getting it done would be high!

I'll have a look at that Des Hamill book too

with those ingredients your engine will scream to 9000.. easily.
must be cams if it wont make power beyond 7400

Took some pictures and did some research.

Apparently, the crank is a pinto crank. Obviously not as strong as Cossie crank, but lighter which is helpful.

Des says that it's good for 8500rpm which is fine, I was thinking 8500 anyway.

But check the cam picture out below. To me it looks extremely mild in terms of duration

quote:

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Originally posted by Rocket_Rabbit
So I have a Cossy engine that has had all the trimmings done to it:

SBD Tapered ITBs
Jondel race head that has been P&P'ed to a 1/1000th inch of its life Big valves, solid rockers, uprated valve springs etc etc
Custom cams
Wossner rods
Cosworth slipper pistons
Dry sump
Omex 600 management

It makes 232bhp @ 7400rpm with 7900 limit

I come from Honda engines so 7900 isn't a lot and I know I can get more by adding some revs.

Perhaps the best thing about the YB is that it is a good deal oversquare and, as such, piston velocities are low per given rpm compared to a normal 2 litre engine.

I'd rather not stroke it because of the cost - taking it to a 2.3 would mean looking at the £3k mark.

I was hoping that a set of cams would be doable.

Anyone any experience?

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quote:

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Originally posted by Rocket_Rabbit
Apparently, the crank is a pinto crank. Obviously not as strong as Cossie crank, but lighter which is helpful.

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it looks like it has ford stamped on the cams?? cant really see but if it is they may be standard turbo cams? most aftermarket ones be it kent/newman etc wont be stamped "ford" would they??

tbh they look pretty standard, (maybe a regrind) looks to have a tad more lift, cant be sure..

any idea what the the lifters are? solid or hyd

HTH

quote:

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Originally posted by mcerd1

quote:

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Originally posted by Rocket_Rabbit
Apparently, the crank is a pinto crank. Obviously not as strong as Cossie crank, but lighter which is helpful.

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the cossie crank is a strait swap if you fancy an upgrade - only real difference is that the flywheel has 9 bolts instead of 6 (which means no need to dowel the flywheel )

burtons sell nice light steel flywheels in pinto or cossie size and they can be drilled to suit either crank - I've got a pinto sized one (5.5kg) on my cossie crank with ARP bolts
I'll admit its not the cheapest option but I think its worth it for the peace of mind...

[Edited on 23/12/2011 by mcerd1]

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quote:

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Originally posted by Craigorypeck
Same as... had the cosworth flywheel machined down and the pinto ring gear put on. cheap

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quote:

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Originally posted by Craigorypeck
it looks like it has ford stamped on the cams?? cant really see but if it is they may be standard turbo cams? most aftermarket ones be it kent/newman etc wont be stamped "ford" would they??

tbh they look pretty standard, (maybe a regrind) looks to have a tad more lift, cant be sure..

any idea what the the lifters are? solid or hyd

HTH

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measure the height of the lobe top to bottom and subtract the radius.. should give the lift..

Cams will have to come out to see if the lifters are shimmed.

quote:

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Originally posted by Craigorypeck
measure the height of the lobe top to bottom and subtract the radius.. should give the lift..

Cams will have to come out to see if the lifters are shimmed.

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Rocket_Rabbit


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