Piper or Cat Cams, which to break 200hp in 1.8 vaux

[porszak]

hi, my engine is bored/stroked to 1.8ltr c16xe. with Mantzel, schrick 264, SuperSprint manifold it makes 176hp. which cams should be better, somebody know piper timing for over 1mm lift?
piper 280/278
catcams 272/272 or 282/282

[Davey j]

You want something up in the 80's to stand a chance I'd say. Piper 285's don't quite make 200bhp on a throttle bodied 20XE.

[spanishfly]

What lift on these cams? I know Cat like high lift lower duration.

[porszak]

cat 272/272 over 1mm duration is 235/235 with 8.9/8.9mm lift and 1.95/2.0mm at tdc
cat 282/282 over 1mm duration is 249/249 with 10/10mm lift and 3.45/3.7mm at tdc
piper 280/278 11.43/11mm lift and 2.74/2.49 at tdc
however i know, it's quite sure info that over 1mm lift at piper is no more than 210degree... so they arent so long like they seems to be

[spanishfly]

piper give 'fake' measurements. Out of them cams I would be going for the cats if the quest was 200bhp, on my XE I had 300 degree ones, they had 12.7mm lift
I just noticed the engine is an x16xe thats been bored rather than an x18xe1. What sort of headwork have you had done?

[porszak]

headwork includes polished channels, removed air channel from exhaust channel, 3 angle valves. valves are sts c16xe valves

[spanishfly]

What is the cars main use? Road or track work?

[porszak]

toy for a weekend, hardly ever as daily car

[Gordo]

I'd be looking at a carb or throttle body conversion first, TBH.
The other issue is valve to piston clearance - this may not be a problem, though, if you're using higher compression pistons that already have deeper valve notchets.
If it is a problem,ei, using a stock type piston, you may be restricted on how much furhter you can go without having them cut.