Baz 421 Posted October 25, 2006 Remember there being some talk of the standard 1.6 and 1.9 cams being different lift/duration. Have tried searching for a while now to no avail!! We are rebuilding a 1.9 at the moment to a mild spec, L&B bottom end, some cleaning up of ports/matching etc, wondered whether there would be any benefit of using a 1.6 cam in the head rather than the lazier 1.9 item? Eventually i think the owner is planning a more lairy cam for it aswel as management etc but for now would like to know whether to stick with a 1.9 item or perhaps given the probable more revvy nature could be more beneficial to go for a 1.6 cam. Any thoughts? Would anyone have the figures for lift and duration for each? Cheers. Share this post Link to post Share on other sites
welshpug 1,626 Posted October 25, 2006 its not the cam but the bottom end and head itself that giver the lazier feel to the engine. cam specs varied quite a bit so it depends what you've got access to as well. Share this post Link to post Share on other sites
welshpug 1,626 Posted October 25, 2006 found some numbers i'd posted on PSOOC Lift 11.5 mm Nominal clearance 1.0 mm Inlet opens 11 30' BTDC closes 43 ABDC Exhaust opens 46 BBDC closes 2 ATDC STD 1.9 cam. Share this post Link to post Share on other sites
welshpug 1,626 Posted October 25, 2006 (edited) oh, and for the 1.6 cam lift 11.5mm inlet opens 8 BTDC Inlet closes 42 ABDC exh opens 40 30' BBDC exh closes 2 30' ATDC (from early 87 on, as in 115bhp engines Edited October 25, 2006 by welshpug Share this post Link to post Share on other sites
24seven 104 Posted October 25, 2006 Are there any distinguishing markings that will identify the different camshafts? I've bought a spare head from a scrapyard and the cams in it look pointier than the ones in the head I've just rebuilt and refitted. Share this post Link to post Share on other sites
j_turnell 134 3 Cars Posted October 26, 2006 The earlier 1.6 cams has chamferd edges whereas the 1.9 doesnt and tend to wear. Later on from 91' onwards this changed to the same appearance to the 1.9 cam. Take it you dont know any info on the car the head was off? Share this post Link to post Share on other sites
mfield 20 Posted October 26, 2006 Eventually i think the owner is planning a more lairy cam for it aswel as management Might well be worth uprating the valve gear now while the heads off e.g. springs, Iirc puma racing's upgrade seems well priced ? The head might well need some machining for the lobes of a lairy cam, aswell cr needs to be thought about ? Share this post Link to post Share on other sites
Dazza 4 Posted October 26, 2006 (edited) As mentioned i would stick with the 1.9 set-up as your not going to feel any difference what so ever on the road beteen the two cam's . They do begin to die off in comparison to a higher torque spec cam from 4k . I would advise you to skim 28 thou of the head and fit a Piper BP 270 cam in it ,(ive a near new one For sale) On the rollers you'll see the difference from 4 K if you can fuel it correctly on the injection ,however youll not get the best from it with out 45's . If you get it right its a great performer , you might see an extra 10- 15 bhp circa 115 from a standard 100 at the wheels ? EG my car's figures at the WHEELS ; 106 bhp at 4K 120 bhp at 5K 140 bhp at 6k holds to 6800 rpm's before dropping . . Given a 20% drag loss from the gear box thats circa 165/170 bhp at the flywheel ? Dazza Edited October 26, 2006 by Dazza Share this post Link to post Share on other sites
Baz 421 Posted October 26, 2006 Thanks all for the replies, and the figures Welshpug, food for thought! The earlier 1.6 cams has chamferd edges whereas the 1.9 doesnt and tend to wear. Later on from 91' onwards this changed to the same appearance to the 1.9 cam. Take it you dont know any info on the car the head was off? The head is from an H plate 1.9, so '90/'91, and the choice of cams is from the same car or a '91 1.6, but as said, and looking at the figures, i'm not sure it will make a noticeable difference anyhow. Might well be worth uprating the valve gear now while the heads off e.g. springs, Iirc puma racing's upgrade seems well priced ? The head might well need some machining for the lobes of a lairy cam, aswell cr needs to be thought about ? Would definately make sense wouldn't it Mark, especially to skim the head now before it goes back together, and i have mentionned to the owner, but not sure he fully understands why and how it could benefit him later with his planned mods, or he just doesn't wanna spend alot more than he already has!! Cheers. Share this post Link to post Share on other sites
RobMGti 0 Posted October 26, 2006 Personally i wouldnt fit a 270 cam if someone paid me :s been there, got the T-shirt, waste of space. For the time being keep a 1.9 cam in. Address issues when he wants to upgrade Share this post Link to post Share on other sites
