I know somebody with a 265bhp version and as most 2litre engines would need alot of work to get to that sort of power level, it might as well have Cosworth on the cam cover. (I'd be just as happy with Honda though
)
i recently saw a westfield advertised on the internet with a cosworth yb turbo engine. the turbo had been removed and its now a n/a yb motor. obviously some work has been done to modify the engine but what advantage would removing the turbo give? i would imagine a wider power band. but i would also imagine the tuning potential will now be far less. any thoughts?
To make a YB into a really good N/A engine takes a little more than take the turbo off and raising the compression ratio - the airflow of the head
suits a turbo engine moreso than a N/A application, as do the cams.
The reasons? Well, its a 2.0 16v engine with very strong internals, so will probably suffice for any extreme N/A tuning. I think the best was about
240bhp from these sans turbo.
Oh...and it says Cosworth on the top...
[Edited on 30/7/09 by ss1turbo]
i would have thought that it would be pointless removing the turbo!!!
In turbo form there would surely be a wider power band compared to n/a trying to put out the same amount of power.
I would stick to the turbo on low boost than waste a boat load of money on converting it to n/a
Just my view
It depends what you want really - there is something nice about N/A power.
I know somebody with a 265bhp version and as most 2litre engines would need alot of work to get to that sort of power level, it might as well have
Cosworth on the cam cover. (I'd be just as happy with Honda though )
here is a pic. he thinKs 220 BHP
Quite a few motorsports classes dictate NA only. It may have originally been put together (taken apart?) for motorsport. Look at the Millington Diamond!
to do this you need to spend a far bit of cash on the head as flow wise the yb head is crap.
its just not possable to do this mod cheap,you could end you spending alot but maybe not enuff and end up with disapointing power
the engine spec is massive! but i cant understand why you would spend so much moddifying the engine to get same power as standard turbo
Power delivery, space/heat restrictions and competition classes. Normally aspirated YB's are quite common, though it does take a lot of work on the head to extract good power.
quote:
Originally posted by daniel mason
the engine spec is massive! but i cant understand why you would spend so much moddifying the engine to get same power as standard turbo
quote:
Originally posted by jpindy3
to right,also there are so meny boost controls on the market that will give a good all range power,i dont see why people want to take the turbo off.its not as if you have to run a dump valve now is it.
Complexity and pipework, space, smooth bay, opportunity for noisey TB's, way in which power is delivered and traction. Personally I dont get it
and big turbo for me makes a cossie lump what it is although i do remember seeing some in great looking Mk1 Escorts.
[Edited on 30/7/09 by bassett]
I seem to recall seeing a dyno shootout in one of the mags (CKC?) where an owner had a NA YB. IIRC, the torque graph was pretty flat, even though the
power dropped off at the top end without the turbo.
Or maybe I'd eaten too much cheese before bedtime...
Some rules for competition would put you in the class with 3000 N/A leave the turbo on.