MG ZR: Cams & Maps

[lolsteve]

So getting a nice tax rebate soon so been looking at stuff to buy  


Been thinking about port&polishing the head for some time now as want to make sure the engine is able to properly breath and rover casting quality leaves something to be desired...ahem

Anyway found this interesting site with some flowbench values on 
http://www.sabre-heads.co.uk/2.html
Sounds like the guy running it was involved with rover during the 143 to 160 headwork and alot of the proposed improvements were turned down..
"while employed with Janspeed, we were asked by Rover to make changes to the VVC casting. Many porting, chamber/seatwork changes were made/offered BUT rover decided, to their detriment, to only implement the most basic of these changes - we later found this was part of the VVC160 development- so while people think the 160 casting to be far superior, it in fact offers little against the earlier version"


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First line of figures is the Std Inlet flow(143). 31.5mm valves. All std parts.                                                                                  

19.3    39.7     62.1     82        97.97      106.5      109.95      112.7      113.4


Later 160hp spec VVC. 31.5mm valves. All std parts, barely improved flow over 145hp version. 
21.1    43.9     65.2     84.2     98.55      104.9       111.3       113.4      114
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So the lower lift flow is greater on the 160 as advertised by rover but it seems after that the heads have about the same capacity. 
And exhaust..
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EXHAUST flow, 143hp VVC/Motorsport casting. Std flow- 27.4mm valves. All std parts. 

17.1    35.3     52.7     64.3      70.1      73.4       74.7      76.4      78


Later 160 spec VVC. 27.4mm valves. All std parts. Barely improved flow over 145 version. 
17.2    36.7     53.5     66.4      73.4      76.8       78.4      79.1      80
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Also ever since fitting the coilovers I've started taking an interest in how the car looks. Maybe I've been hit by the scene bug but really want to get the scratches and rust sorted now. bought some ebay clay bar and tesco polish too so as to have a play at "detailing"  helps I have a huge bag full of armour all better than a wax sample packets