wickiewicked240z Posted August 12, 2013 Share Posted August 12, 2013 I got my delta 270-2 camshaft and resurfaced rocker arms. Everything looks good. Quote Link to comment Share on other sites More sharing options...
skirkland1980 Posted August 12, 2013 Share Posted August 12, 2013 Could you measure your lobe width and height for me? I ordered this same grind and got a stock cam in return. Just wondering if all of them were ground the same. Quote Link to comment Share on other sites More sharing options...
wickiewicked240z Posted August 12, 2013 Author Share Posted August 12, 2013 I don't have a caliper to measure. I'll go to harbor freight and buy one. Do you have your measurements? Quote Link to comment Share on other sites More sharing options...
skirkland1980 Posted August 13, 2013 Share Posted August 13, 2013 My 272 cam was supposed to be .450". The lobe height: was 1.51", width was 1.24". That equaled to .405 lift. Quote Link to comment Share on other sites More sharing options...
skirkland1980 Posted August 13, 2013 Share Posted August 13, 2013 Also make sure your rockers were surfaced properly. If not you could have an extremely noisy and short lived valvetrain. I'm posting a video of my results now. Quote Link to comment Share on other sites More sharing options...
wickiewicked240z Posted August 13, 2013 Author Share Posted August 13, 2013 (edited) Intake Lobe height-1.526" Diameter -1.226" Exhaust Lobe height-1.534" diameter - 1.234" Edited August 14, 2013 by wickiewicked240z Quote Link to comment Share on other sites More sharing options...
wickiewicked240z Posted August 13, 2013 Author Share Posted August 13, 2013 (edited) Stock F cam specs I have in p79 head right now Intake Lobe height-1.577" Diameter -1.308" Exhaust Lobe height-1.588" Diameter -1.308" Edited August 14, 2013 by wickiewicked240z Quote Link to comment Share on other sites More sharing options...
wickiewicked240z Posted August 13, 2013 Author Share Posted August 13, 2013 These are the specs that the 270-2 cam supposed to have. Is my camshaft even close to those numbers. I don't really know how to read the sheet they sent with those numbers. Quote Link to comment Share on other sites More sharing options...
skirkland1980 Posted August 13, 2013 Share Posted August 13, 2013 It's better than mine was. I didn't get one of those sheets with mine. They think the L6 rocker ratio is 1.5, it's only 1.4. You can get it closer to 1.5 with thicker lash pads where the lobe peak is a little closer to the adjuster. Quote Link to comment Share on other sites More sharing options...
skirkland1980 Posted August 13, 2013 Share Posted August 13, 2013 I also got some rockers that were cut unevenly. I made a video of me measuring them with a dial indicator. I'm on my phone right now but if you look in the L6 forum under ' loud tapping noise even at idle' it's posted there. Quote Link to comment Share on other sites More sharing options...
NewZed Posted August 13, 2013 Share Posted August 13, 2013 If you look at pages EM-29 and EM-30 in the 1976 Engine Mechanical chapter you can derive 1.5 and/or 1.6 ratios yourself. If you calculate in the hot lash numbers you'll get ~1.53 (intake and exhaust different), if you ignore lift lost to lash you'll get 1.57. Both above 1.5, no way to round down to 1.4. Later FSM's, ZX's for example, don't have enough numbers to do the math. Quote Link to comment Share on other sites More sharing options...
skirkland1980 Posted August 14, 2013 Share Posted August 14, 2013 You have a usable rocker length of 2.4". Dead center of the contact pad is 1.7" from the pivot point leaving 0.7". It makes triangle then you can calculate the lengths from there. Quote Link to comment Share on other sites More sharing options...
NewZed Posted August 14, 2013 Share Posted August 14, 2013 You can also do the math in Delta's spec sheet. Those are all measured numbers. Theirs comes out to 1.5 (.466/.3104). Subtract the lash out and you get 1.47. I'm just doing math on numbers available, not real rocker arms. Delta actually measured the lift on ww240z's cam, so the math is kind of moot for his wonderings. Looks like they added lash back in to get "gross". The bulk of the internet and literature uses 1.5, so the fight to change thinking to 1.4 will be a good one. Quote Link to comment Share on other sites More sharing options...
skirkland1980 Posted August 14, 2013 Share Posted August 14, 2013 It's actually 1.41:1. Quote Link to comment Share on other sites More sharing options...
wickiewicked240z Posted August 14, 2013 Author Share Posted August 14, 2013 Sorry I mess up on the cam measurements I put the right ones already for the delta cam. They all calculate to 0.45 Quote Link to comment Share on other sites More sharing options...
wickiewicked240z Posted August 14, 2013 Author Share Posted August 14, 2013 Exhaust (H)1.534-1.234 (d)= 0.3 x1.5=0.45 Intake (H)1.526-1.226(d)= 0.3x1.5= 0.45 Quote Link to comment Share on other sites More sharing options...
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