bgpzfm142
crossmember
- Joined
- Dec 25, 2013
- Location
- Launceston, Tasmana
John, you seem to be wasting your time, from a quick read it looks like the OP has no intention on upgrading the internals....
Perhaps afraid of doing any real engine work or wants to invest all his money on things people see when he opens his hood? (or is it bonnet over there?)
Bonnet. The hood is the driver (short for 'hoodlum').
It's unfortunate that he didn't wish to talk DOHC camshafts. While there's plenty of data
around for 8V cams, I haven't been able to find enough data on 16V cams to be able to
compare the numbers on equal terms.
However, I thumped all the numbers I could find into an Excel spreadsheet.
For example, the B234 UI/UA set has a lift of 9.38mm and an advertised duration of 268?,
and the valve opening and closing events are documented.
OTOH, the B204FT FI/FA set has lift of 6.81 mm (intake) and 7.45mm (exhaust), opens the
inlet at 12.9? ATDC and exhaust at 31.2? BBDC... and, well, that's about all I could find on
them.
When it comes to the AQ171 cams there's not a lot of data I could find on them, although It
Is Claimed By People (yes, the ubiquitous People) that they are Better Than Standard,
whatever that means. But when it comes to finding out and documenting the actual
numbers for them, as well as other things, there are a lot of blank spaces.
See?
And with the numbers that vendors like to publish, it's difficult for a tinkerer like myself to
compare apples to apples. (Although Cat Cams, bless 'em, seem to publish more
extensive data about their items than what I have listed above).
Might be wrong about this, but I read somewhere that the ideal cams for a boosted
applications had less overlap when compared with NA performance cams, but instead
focused having on greater lift than standard NA units. Yet the B204FT has less lift than
the NA cams.
So, people out there with B230 16V turbos and those in the know, I seek your guidance.
What cams are you using? On what fuel? Mechanical or regular tappets? Standard size
or oversized valves? And what kind of results are you getting at what boost levels?