daniel mason
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| posted on 30/7/09 at 06:21 PM |
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na engines?
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?
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ss1turbo
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| posted on 30/7/09 at 06:39 PM |
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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]
Long live RWD...
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tomgregory2000
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| posted on 30/7/09 at 06:40 PM |
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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
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Project7
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| posted on 30/7/09 at 06:56 PM |
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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  )
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daniel mason
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| posted on 30/7/09 at 07:13 PM |
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here is a pic. he thinKs 220 BHP
 
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Richard Quinn
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| posted on 30/7/09 at 07:20 PM |
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Quite a few motorsports classes dictate NA only. It may have originally been put together (taken apart?) for motorsport. Look at the Millington
Diamond!
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jpindy3
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| posted on 30/7/09 at 08:36 PM |
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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
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daniel mason
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| posted on 30/7/09 at 09:06 PM |
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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
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MikeRJ
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| posted on 30/7/09 at 09:12 PM |
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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.
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jpindy3
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| posted on 30/7/09 at 09:16 PM |
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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
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.
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MikeRJ
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| posted on 30/7/09 at 09:19 PM |
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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.
A turbocharged engine rarely if ever gives the instant response and controllability of a normally aspirated engine. I can remember back when I owned
an MR2 turbo, on track days the normally aspirated cars were hardly any slower, despite a significant power discrepancy (155/170 bhp vs 220/245bhp
depending on year)
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bassett
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| posted on 30/7/09 at 09:28 PM |
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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]
My MNR Blog Updated Jan 2010 - Track Day Prep Begins!
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mediabloke
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| posted on 30/7/09 at 09:36 PM |
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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...
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Canada EH!
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| posted on 30/7/09 at 09:49 PM |
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Some rules for competition would put you in the class with 3000 N/A leave the turbo on.
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