Ben's Z Posted November 19, 2012 Share Posted November 19, 2012 I have been shafted once and it appears I am on the verge of being hosed again by two different forum members on used P90 Cam. First member "Francisco" sold me a cam with a smashed dowel pin and a crack from the dowel pin hole to the edge. I will update this tomorrow if member #2 does not reimburse me in 24 hours. His cam was supposed to be here Thursday, problem is his USPS tracking number has never been valid. Given that, a member I trust said he would give me a P79 cam for my turbo engine swap. I have read both good and bad about doing this when I intend to run the OE ECU. The cam does need to be sent of to be polished. Should I tell Delta Cam to do anything else to it while they have it? What does having a cam cleaned up usually cost? As mentioned before in previous theads here are my intended mods. Bell RRFPR FMIC Manual Boost Adjuster 3" Exhaust I think I would have had this motor back in 4 weeks ago if I had gotten some honesty out of our fellow members. Getting real hard to trust people. Quote Link to comment Share on other sites More sharing options...
Xnke Posted November 19, 2012 Share Posted November 19, 2012 I've got one of those cams with the dowel pin smashed into it, but my machinist thinks it can be fixed...for a price. Is your cylinder head a hydraulic lifter P90 or a solid lifter? If it's a solid lifter, then the cam will *run*, but may not run that well, might run just fine, might run better than stock. I dunno how the ECU would handle it. Basically, under 4000RPM, and not at WOT, the ecu uses the AFM to calculate fueling. Over 4000RPM, or at WOT, the ecu enters a pre-programmed fuel curve. It can't make any kind of adjustment at that point, and is just going to follow that curve till it's under 4000RPM and less than WOT. Quote Link to comment Share on other sites More sharing options...
NewZed Posted November 19, 2012 Share Posted November 19, 2012 (edited) The dowel pin might be just for location. Clamping force from the bolt would hold the sprocket. The crack might be irrelavant since it's "pinned" by the dowel hole. Just a proposal worth thinking about. Edit - I got curious, did a search and found an old Hybridz thread on the same topic - http://forums.hybrid...-issues-beware/ And another - http://www.the510realm.com/viewtopic.php?f=2&t=11001&view=next Edited November 19, 2012 by NewZed Quote Link to comment Share on other sites More sharing options...
Ben's Z Posted November 19, 2012 Author Share Posted November 19, 2012 Here is the cam. Head is P90. I was told not to use this cam. Quote Link to comment Share on other sites More sharing options...
HowlerMonkey Posted November 19, 2012 Share Posted November 19, 2012 (edited) Actually.....it's 3500rpm where the stock zxt fuel system goes into open loop. With 108 ft. pounds of torque, the dowel does nothing but properly index the gear as you install it. The cracking is from the sprocket beating back and forth on the dowel because the bolt isn't tight enough. I would simply get a used p79 head, bolt it on, and now you have a running car while you can sort out the p90 and cam options. I'm about to put a p79 back on in place of a P90 and notice no difference in the performance between the two. Edited November 19, 2012 by HowlerMonkey Quote Link to comment Share on other sites More sharing options...
Ben's Z Posted November 19, 2012 Author Share Posted November 19, 2012 Actually.....it's 3500rpm where the stock zxt fuel system goes into open loop. With 108 ft. pounds of torque, the dowel does nothing but properly index the gear as you install it. The cracking is from the sprocket beating back and forth on the dowel because the bolt isn't tight enough. I would simply get a used p79 head, bolt it on, and now you have a running car while you can sort out the p90 and cam options. I'm about to put a p79 back on in place of a P90 and notice no difference in the performance between the two. I don't have a P79 head to put on and I have a rebuilt P90 on the bench minus the cam. Quote Link to comment Share on other sites More sharing options...
Ben's Z Posted November 19, 2012 Author Share Posted November 19, 2012 I got a line on a P79 cam at Awesome Z here in Houston. Please give me some feedback ASAP if you got any. Quote Link to comment Share on other sites More sharing options...
Ben's Z Posted November 19, 2012 Author Share Posted November 19, 2012 Ok here is another thought. I have my old motor could I/should I use that cam? 77 280z internally oiled.... Mull that around. I could just take the cam, bearings, rockers everything and run with it? Quote Link to comment Share on other sites More sharing options...
skirkland1980 Posted November 20, 2012 Share Posted November 20, 2012 I also was going to buy an item from a member but he lived closed to me so I was going to pick it up. At first it was ok but then he stopped replying to my emails. Makes me wonder if he was looking to rip someone off? Quote Link to comment Share on other sites More sharing options...
Ben's Z Posted November 20, 2012 Author Share Posted November 20, 2012 I think I am going to go with my 77 280z cam and be done with it. Should I use my cam towers from that head or my rebuilt P90? Should I use the rockers arms from the 280 or my resurfaced ones? I was thinking about keeping my resurfaced ones off to the side for now in case I have any errors in my first rebuild attempt. Quote Link to comment Share on other sites More sharing options...
Josh280z Posted November 20, 2012 Share Posted November 20, 2012 http://www.atlanticz.ca/zclub/techtips/cam/index.htm Quote Link to comment Share on other sites More sharing options...
Ben's Z Posted November 20, 2012 Author Share Posted November 20, 2012 http://www.atlanticz...s/cam/index.htm Been there, seen that. Doesn't say anything about cam towers. Quote Link to comment Share on other sites More sharing options...
Josh280z Posted November 20, 2012 Share Posted November 20, 2012 It depends is the cam you are using internally oil or use the spray bar? Also, do the cam towers have the oil holes if the cam is indeed internally oiled. Use the rocker arms that go with the cam. Quote Link to comment Share on other sites More sharing options...
Ben's Z Posted November 20, 2012 Author Share Posted November 20, 2012 I am using the P90 cam towers, everything else is coming off of my N47. If it runs like ****, it runs like ****. Quote Link to comment Share on other sites More sharing options...
Josh280z Posted November 20, 2012 Share Posted November 20, 2012 Not a good perspective, but hey, it's your car. Quote Link to comment Share on other sites More sharing options...
New 2 z Posted November 20, 2012 Share Posted November 20, 2012 I have a N47 head if you need it. Quote Link to comment Share on other sites More sharing options...
NewZed Posted November 21, 2012 Share Posted November 21, 2012 I would take a breather, study what's been suggested, and put a sensible plan together. I have this vision of you throwing everything together, getting it running, then revving the crap out of it until it blows up just to vent some frustration. Seriously, you have several paths to get a good cam in the engine and get things working. The whole cam, cam tower and rocker arm things have been discussed to death on the various forums. The most recommended suggestion seems to be to take the cam, towers and rocker arms out as a complete assembly, with every part in the same order and orientation and swap them over to the other head. Tap on the cam towers as you slowly tghten the bolts to make sure the cam spins freely befoe you torque the bolts down. "Blue" up all of the rubbing parts afterward, spin the engine over a few times, then check for high spots and/or odd wear patterns. This is what I've learned. I've never had a cam off though. Quote Link to comment Share on other sites More sharing options...
Josh280z Posted November 21, 2012 Share Posted November 21, 2012 I would take a breather, study what's been suggested, and put a sensible plan together. I have this vision of you throwing everything together, getting it running, then revving the crap out of it until it blows up just to vent some frustration. Seriously, you have several paths to get a good cam in the engine and get things working. The whole cam, cam tower and rocker arm things have been discussed to death on the various forums. The most recommended suggestion seems to be to take the cam, towers and rocker arms out as a complete assembly, with every part in the same order and orientation and swap them over to the other head. Tap on the cam towers as you slowly tghten the bolts to make sure the cam spins freely befoe you torque the bolts down. "Blue" up all of the rubbing parts afterward, spin the engine over a few times, then check for high spots and/or odd wear patterns. This is what I've learned. I've never had a cam off though. I agree, don't half-ass your project you will be sorry. It may take a little while longer but at least you will have the desired results.. I'm actually swapping a cam myself and doing what NewZed stated, because I had read multiple times that's what you had to do... Quote Link to comment Share on other sites More sharing options...
Ben's Z Posted November 21, 2012 Author Share Posted November 21, 2012 (edited) I am not doing anything half assed. I have just made the determination to use my 77 280z Cam, because input from the crowd for or against was never answered. I also think it is erroneous to use the cam towers from the 280z head and not the cam tower from my P90. The P90 has been shaved and I am certain my N47 has never left the block. Everything, rockers, lash pads, and cam will be used from my 280z engine. No one (still) has answered what adverse affects if any what my "A" cam will have in this turbo motor using the stock ECU. My 77 engine has less than 94k on it and the cam looks like brand new. I will put permanent marker on all of it and roll it over to check for wear. I took my f'ed P90 cam (that "Francisco" sold me) last night, oiled the P90 towers and the cam spun over in the journals, it was a little tight but I also wasn't done tapping and tightening. Edited November 21, 2012 by Ben's Z Quote Link to comment Share on other sites More sharing options...
Josh280z Posted November 21, 2012 Share Posted November 21, 2012 (edited) Look at this cam specs from the list I gave you, should give an idea whether it will work or not. Edited November 21, 2012 by Josh280z Quote Link to comment Share on other sites More sharing options...
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