Guest zfan Posted June 2, 2005 Share Posted June 2, 2005 I just got off the phone with Compcams Tech folks regarding swapping my Hydraulic roller lifters out in favor of Solid roller lifters. I know I will not make more power but will protect my investment. I will have to swap out valve springs as well. Also do to less ramp speed on the Hydraulic cam they said I would have to run a very tight valve lash, around 6-8 thousandths. I have never set them that tight before. The main reason for swapping is racing last friday night I found that I am trapping around 62-6300 rpm's. I ran the car 4 times and heard what I thought was a little valve float. Over 6k on a Hydraulic roller set up is a little risky and I have too much money in it to risk when I do not have to. Has anyone else run a hydraulic roller cam and swapped to Mechanical/solid with the same cam? I have entertained swapping cams as well as there are so many more cams/grinds available. A little more power wouldn't hurt either. Mike Quote Link to comment Share on other sites More sharing options...
grumpyvette Posted June 3, 2005 Share Posted June 3, 2005 solid roller lifters tend to be lighter and cost less, but as the cam manufacturer pointed out the lobes ramp varies mis-matching components seldom works correctly (yeah Ive done it, but I quickly smartened up and bought matched components) Im forced to point out that youll be better off using a cam DESIGNED for solid roller lifters and that the push rods may need to be a differant length as the roller lifters themselfs may be differant heights as well as changing the valve springs when you swap lifters. Ive generally had better results with CROWER and ISKY solid roller lifters (IE) they lasted longer under high rpm stress it really is not worth the differance in cost saved vs the potential problems you may have mis matching components http://www.compcams.com/Technical/CurrentCatalog/HTML/282-289.asp http://www.crower.com/misc/m_cat.shtml http://www.iskycams.com/durathon.php Quote Link to comment Share on other sites More sharing options...
Guest zfan Posted June 3, 2005 Share Posted June 3, 2005 Grumpy, I have entertained the idea of swapping the cam as well. If you get a minute scroll down the same forum page and see where I posted regarding the need for speed. I am trying to go faster but do not want to go crazy in doing so. No turbo or super chargers as they are to expensive at this time. I honestly know very little about nitrous so I am hesitant to go that route. If you have any cam grind ideas or can point me in the direction of someone who is knowledgable I would appreciate it. Thanks, Mike Quote Link to comment Share on other sites More sharing options...
grumpyvette Posted June 3, 2005 Share Posted June 3, 2005 http://www.chevytalk.org/threads/showflat.php/Cat/0/Number/629333/an/0/page/0#629333 heres a thread (ABOVE) that will answer most of your nitrous questions (BELOWS your combo) 385 sbc Forged 4340 crank forged 4340 6" H beam rods Forged JE ultra light pistons 11.0 to 1 compression Comp cams camshaft 236/242 duration-520/540 lift, 4 degrees advanced, with 110 lobe seperation. Cam card is XR288HR-10 1.60/1.50 roller rockers bring lift up to 553/540. Canfield 200cc heads with cnc chambers/bowls blended and full radius valve job 1000 miles ago. Victor jr. intake/port matched. Holley/Proform 750 dp carb- jets are 75 primary and 81 secondary. Hooker super comp long tubes 2.5" dual exhaust with H pipe. Transmission Built 1989 Corvette 700r4 with a 9.5" Edge racing converter 3500rpm stall. 1987 300ZXT 3.70 LSD rear end B.F. Godrich drag radials 235/60-15's obviously you did your homework, as its well matched, if it was my car ID seriously consider a 150-250 hp nitrous set up with direct port injector foggers and a nitrous controller..........and retarding your current cam to 4 degrees retarded, BTW, theres just no way to get that much of a boost in power for any where close to the money N/A I found adding a nitrous system to my 383 corvette to be one of the most effective mods I ever made, my combo is similar to yours , ported trickflow heads,11:1 cpr crane 119661 hydrolic roller cam,extensively ported stealthram intake, with nitrous BTW youll get the best results running a solid lifter roller cam specifically designed for nitrous but your current cam should work fine!, youll be wasting a few hp to pumping losses comp[ared to a nitrous design but Im sure youll be impressed with the nitrous anyway,once you get it dialed in correctly, (think retarded ignition, timing,controller, and rich mix) http://www.jegs.com/cgi-bin/ncommerce3/ProductDisplay?prrfnbr=3771&prmenbr=361 http://www.jegs.com/cgi-bin/ncommerce3/ProductDisplay?prrfnbr=3776&prmenbr=361 http://www.jegs.com/cgi-bin/ncommerce3/ProductDisplay?prrfnbr=3866&prmenbr=361 I run a 200hp nitrous system on my corvette and have for several years with no problems at all,(other than twisting off drive train parts very regularly) but I am very careful to retard ignition timing and kept the mix ratio at the richer end of the range at close to 12:1 and check the plugs very carefully and worked up in 25 hp jumps/stages from a 50hp to the 200hp level the only reason I don,t increase past that is it currently breaks drive line parts regularly and Im currently building a new garage so all my money/efforts are concentrated on the garage currently Quote Link to comment Share on other sites More sharing options...
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