spork Posted December 26, 2003 Share Posted December 26, 2003 Alright, I've got an 83 280zxt and I was wondering about swapping the cam from my p-90a with hydraulic lifters(yes it actually has the hydraulic lifters) onto a regular p-90 head from an 81 turbo car. I guess my main question concerns adjusting the valves. I've talked to a couple of local shops about this and wanted to confirm as they're used to mostly v-8 setups. Anyways, what I've been told is that when I'm running a cam designed for hydralic lifters that I can/should decrease rocker to cam clearance. I've got a buddy with a 351 clevland that had his motor setup like this and hasn't had any problems, so I figured I'd throw this idea past some of the more experienced guys to see what they think. I'm not really looking for theroies, but more actual experience. Thanks, James Quote Link to comment Share on other sites More sharing options...
Guest Zcarsmakemyheadhurt Posted December 26, 2003 Share Posted December 26, 2003 You'll never get the valve lash correct, it will always be very noise. Hydro cams are different. Quote Link to comment Share on other sites More sharing options...
Lockjaw Posted December 26, 2003 Share Posted December 26, 2003 There is NO difference between the hydraulic and solid cams in the P90 heads. Use whatever one you want, now I would swap the rockers from the P90a head, since the wear pattern with them is for the hydraulic head cam, but other then that, there is no difference. See this thread in the turbo section. http://www.hybridz.org/phpBB2/viewtopic.php?t=29272 Quote Link to comment Share on other sites More sharing options...
spork Posted December 26, 2003 Author Share Posted December 26, 2003 alex, why will the valve lash never be right? can you explain? Quote Link to comment Share on other sites More sharing options...
Lockjaw Posted December 29, 2003 Share Posted December 29, 2003 Lets make it more interesting. You don't have to use a hydraulic lifter on a hydraulic cam for a V8 either. Sometimes outside the box is where its at. Quote Link to comment Share on other sites More sharing options...
Guest Zcarsmakemyheadhurt Posted December 29, 2003 Share Posted December 29, 2003 A hydrolic cam is going to have a differenct profile than a solid and I have found problems with useing the P90A cam in a solid head. If you think I am wrong I would call Crane cams tec line and see what they have to say or grab a good book. Quote Link to comment Share on other sites More sharing options...
Lockjaw Posted December 29, 2003 Share Posted December 29, 2003 I just gotta take issue with that. Perhaps crane or a book may say as a general rule, but most of the Datsun books also said you could not swap cam towers from head to head, which is again, false. I have done that many times, with no ill affects. I have spoken and confirmed with Nissan Motorsports many years ago the cam data, and there is no difference in the cams for the hydro head and solid. See the thread from above for the cam info. If you are worried about it, send me your hydro cam and the rocker arms, and I will run it in my solid head, or better yet, I will sell you my solid cam for 20 bucks plus your hydro one. This is a datsun specific issue, and the hydro cam will work without issue in a solid head. For that matter, you could use a cam from an NA engine if you like, personally I thought they didn't work as well, but you could use it too, if you like. In fact, I used a hydro cam in my 240Z turbo engine, as it came with a hydro head, and swapped it out for a solid head, and ran the hydro cam foolishly thinking that hydraulic cams are slightly larger then their solid counterparts to make the same rated power. Hence the call to Nismo. Seriously, I will sell you my Solid cam if you are so worried about it 20 bucks, plus shipping and your M cam. There is not a difference. Quote Link to comment Share on other sites More sharing options...
Lockjaw Posted December 29, 2003 Share Posted December 29, 2003 Oh set your valve lash to 8 thous intake, 10 thous exhaust cold, and it will be all good. Quote Link to comment Share on other sites More sharing options...
Guest Zcarsmakemyheadhurt Posted December 29, 2003 Share Posted December 29, 2003 I had a problem when I used a hydro cam in a solid head, maybe you guys wont. Quote Link to comment Share on other sites More sharing options...
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