ozzimark Posted June 29, 2010 Author Report Share Posted June 29, 2010 I've read Wizard Al post about VVT cams in one of the threads and can't figure out what is the best cam to run in VVT heads? It sounds like NA cam out of '03 on the intake but I'm not sure what to run on the exhaust. Does anyone know the specs and what cams would be the best choice for intake and exhaust? Based on the lift, the turbo VVT cam seems like the best choice. Duration will be the deciding factor, once someone who knows the duration of the cams chimes in :ph34r: Link to comment Share on other sites More sharing options...
tsuehpsyde Posted June 29, 2010 Report Share Posted June 29, 2010 Another vote for sticky on this beast. And any info from other threads should be pulled into the OP. Keep it all in one place. Link to comment Share on other sites More sharing options...
NEU Posted June 29, 2010 Report Share Posted June 29, 2010 Based on the lift, the turbo VVT cam seems like the best choice. Duration will be the deciding factor, once someone who knows the duration of the cams chimes in Hopefully they have the specs for my '00R cams too. :( Link to comment Share on other sites More sharing options...
impulse922 Posted June 29, 2010 Report Share Posted June 29, 2010 don't forget about the block windows either RN: N: Link to comment Share on other sites More sharing options...
ozzimark Posted June 29, 2010 Author Report Share Posted June 29, 2010 Indeed, thanks, I'll add that to the OP. The windows are only on RN blocks, and all RN blocks have them? Link to comment Share on other sites More sharing options...
RZT5 Posted June 29, 2010 Report Share Posted June 29, 2010 great thread! subscribing so i get notified of anything else added Link to comment Share on other sites More sharing options...
lookforjoe Posted June 29, 2010 Report Share Posted June 29, 2010 Based on the lift, the turbo VVT cam seems like the best choice. Duration will be the deciding factor, once someone who knows the duration of the cams chimes in I asked aonther ex-Volvo employee to check through his tech spec data from the late 90's - early 00's, and he did not come up with any specs on the cams regarding profiles, duration, etc. Great thread, thanks for bringing the info we do have into one place! Link to comment Share on other sites More sharing options...
NEU Posted June 30, 2010 Report Share Posted June 30, 2010 This post seems to be the only info on VVT cam specs that I've found. I hope someone else can shed some more light on it. As a note for those who want to use later engines/heads, and have heard that NA cams give better power due to more lift, there are a few problems. VADIS says that solid lifter heads started in 2000. Turbo engines then had VVT on exhaust, as noted in a post above. Also, at the same time, Volvo changed from type 55 NA engine to type 61 NA engine (type is the 6th and 7th digit of the VIN). According to VADIS, type 61 NA engines ALL had VVT on the intake cams. So there is apparently no solid lifter intake cam that would fit any engine that was a solid lifer turbo engine from 2000 and later, without making some modifications to allow the cam to fit, except for dual VVT heads from 2003 or later. But there's more! Take, for example, my '01 S60 T5 (B5234T3), I could get an exhaust cam from the later NA type 64 engine (available in 2003 or later), but I found out I would NOT get more lift (9.05 mm lift on my exhaust cam, 8.80 mm on the NA VVT cam!), and would be unable to use a type 64 NA intake cam for my car (anyway, going from lift of 8.40 mm to 8.65 mm is not a huge jump.) Unless I could get the earlier style type 55 NA engine hydraulic cam to work with my engine, a task I have doubts about undertaking. Thought of several possibilities that might make any conversion simply too hard, including different lengths of valves or springs, different thickness of tappets betweeen hydraulic and solid lifters, etc. VADIS was valuable for checking that out. turns out I was wrong on all of my ideas, and the answers are much simpler. Hydraulic Lifters 1999 B5244 NA Intake valve length and lift 104.05mm + or - .2mm 8.65mm lift Exhaust valve length and lift 103.30mm + or - .3mm 8.80mm lift 1999 B5234T3 Turbo Intake valve length and lift 104.05mm + or - .2mm 7.95mm lift Exhaust valve length and lift 103.30mm + or - .3mm 7.95mm lift spring length for both 43.3mm + 1.5mm or - .5mm Solid Lifters 2001 B5244 NA Intake valve length and lift 104.25mm + or - .25 mm 8.65mm lift Exhaust valve length and lift 103.30mm + or - .25mm 8.80mm lift 2001 B5234T3 turbo Intake valve length and lift 104.25mm + or - .25 mm 8.40mm lift Exhaust valve length and lift 103.30mm + or - .25mm 9.05mm lift spring length for both 45.1mm + 1.5mm or - .5mm NOTE: B5244T3 engines had 8.45mm lift on the intake! (LPT from 2001-2003) Results, the valves are virtually identical in length. The springs are even shorter on hydraulic cam engines. Neither theory worked there, either. These results imply to me that the supposed dramatic gains in performance from using a NA cam on our engines is not likely to be very important on 2001 and later engines, and even then, only on the intake cam. For earlier engines, there is .7mm to .85 mm more lift on a NA cam, which is likely to show up in your performance. The reason for a VVT head is to get the ability to phase the cams for better low end torque, better emissions, and then better high end power, by varying what is known as the LSA (Lobe Separation Angle). The V8 crowd watches this closely, because it means the difference between high end power and poor idle, or good idle and mid-range, but mediocre top end power. Only lately are Detroit Iron getting with it for VVT cams. The only option for me to get a better intake cam is to get a cam from a B5244T3, or a head from a later engine with dual VVT, and then try to figure out how to control the intake VVT with my ME7.x system. If iPD doesn't allow that to be done (unlikely they could add that functionality), then I'd have to wait for TurboTuner to release a system for the ME7.x cars, and see if I could wire the system to the additional intake VVT cam. Somehow, it doesn't seem worth the effort for .25mm of extra intake cam lift. Link to comment Share on other sites More sharing options...
ozzimark Posted June 30, 2010 Author Report Share Posted June 30, 2010 Note that all that data is organized in a little table in my first post I might just have to acquire some cams and measure them up. :blink: Link to comment Share on other sites More sharing options...
the commissar! Posted June 30, 2010 Report Share Posted June 30, 2010 don't forget about the block windows either RN: N: Nice shots...Got any of the other Half to add or is it windowless...I might have a reason to send my block to the machine shop soon Link to comment Share on other sites More sharing options...
impulse922 Posted June 30, 2010 Report Share Posted June 30, 2010 Indeed, thanks, I'll add that to the OP. The windows are only on RN blocks, and all RN blocks have them? only on RN(01+?) to my knowledge, but dont know the latter. Nice shots...Got any of the other Half to add or is it windowless...I might have a reason to send my block to the machine shop soon no idea, these are just some pictures i picked up a couple years ago. Link to comment Share on other sites More sharing options...
Tightmopedman9 Posted July 1, 2010 Report Share Posted July 1, 2010 What is the advantage of window blocks if I may ask? Link to comment Share on other sites More sharing options...
impulse922 Posted July 1, 2010 Report Share Posted July 1, 2010 What is the advantage of window blocks if I may ask? has something to do with reducing crankcase pressure on high output motors. Link to comment Share on other sites More sharing options...
ozzimark Posted July 1, 2010 Author Report Share Posted July 1, 2010 What is the advantage of window blocks if I may ask? There's more to it than this, but when one piston is moving down, it is pressurizing the air below the piston as it depressurizes the air above it, or draws in fresh charge from the intake, depending on what part of the stroke. That pressurization reduces power output, since the force pushing the piston is equal to the area* pressure on the top minus the area*pressure on the bottom of the piston. I'm sure it also improves crankcase ventilation as well Link to comment Share on other sites More sharing options...
dublin14 Posted July 1, 2010 Report Share Posted July 1, 2010 Whats the Duration on 98 NA cams? I have a set but would love to get 93 NA cams if anyone has them? Link to comment Share on other sites More sharing options...
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