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CharlieW

z24

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So I ended up going with a ported cylinder head...not polished on the intake side... A high performance Nismo cam, and a Weber 38 outlaw from redline. This was against much knowledge from others on several forums that...months ago when I planned this build... said that the 38synchrous was a definite over-carb situation for a dish pistoned Z24. I set the mark on the crank pulley to the 10 on the timing tab and set the cam dowel straight up on the number 2 sprocket hole. I think the engine spun over maybe half a turn and fired up. Mind you guys, I have not adjusted the carb at all. I aired up the tires tonight for a test drive thinking that at low throttle it would fall on its face because of what I had heard...

That is the farthest from the truth. It ran flawlessly. The choke worked perfectly. The truck ran and pulled smooth no matter what the engine load was in any gear. Never one did it skip/miss or have any flat spots. It pulled way harder than it ever did before, especially in 2nd and 3rd. I didn't run it hard at all...yet..., just because it sat for a very long time before I got to do this job. I am here to tell you guys that with a decent cam, a Weber38 is definitely not an over carb situation for these trucks. Hell, Im not even running a header. I did however port match both manifolds which took maybe half an hour. I am incredibly pleased with the results, and the fact that I spent a few bucks more with redline because the carb is perfect right out of the box. I ordered a jet kit at the same time, but the technician I had on the phone said I wouldn't need them...boy was he right. Those guys are fantastic. I would be glad to help anyone that has any questions about the setup and I will post a video link to YouTube as as I take it tomorrow. One proud 720 owner here and a huge thanks to Tigerracing/Corey for the cam recommendation.

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Good for you! Port matching the gasket was a great idea.

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which nismo cam did you go with?

 

i didnt even know nismo offered z series cams..

 

with the bigger cam, do you have stiffer valve springs, or was it okay with the stockers?

 

good luck with the engine man.

 

ive got a z24 in the garage right now waiting for my 620. prolly gonna be gettin it in next week..

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Good question with the springs. Popular wisdom has it they are only good to 4,500-5000 which is about as powerful as the Z24 gets anyway. A Nismo cam might rev higher and need stiffer ones. Sealick got some from a Ford? that added about 30 pounds of pressure to them.

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hmmm.

 

yeah i looked onthe nismo website, but they dont have any offerings for the Z series.

 

COMPcams makes 2 grinds for the Z series engines.. neither says anything about heavier springs..

 

guess when i actually do get a cam, ill worry about it.

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The cam is part number 99996-D1017... it is on page 83 of their 2010 catalog. It is listed as .406"/272°. I didn't have to use any different springs or shims...and it runs like a champ. MSRP on that cam is $86.20 and if you call your dealer with that part number, they will tell you its no good. Tell your dealer to call Nismo with that number and they had like 92 left available....forever. They are not being made anymore. I had heard that they were made by Mikuni

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wow! under a hundo for that cam??

 

i think i might have to pick one up...

 

how does the idle sound with that much duration? the lift is alot lower than the COMP ones.. theyre .420 and .422

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So I noticed...the guy at Nismo was especially not helpful, but I have a sneaking suspicion that those cams were the ones used in the R.V. camper edition trucks...the idle is just a tad more choppy, but not much. The difference in performance feels pretty good but I haven't stretched its legs yet....that should really be where it wakes up.

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Yeah but the carb is a Weber 38 that favors the big end...my hopes are that this is a combo that will be good all around, although I do realize that a cam and carb should be a matching pair...

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RV grind cams tend to favor low mid range torque and power for hauling loads. Less overlap

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So far, tires won't hold air very long so I haven't gotten a chance to open it up at all...stay tuned...got new tires sitting at the shop for Monday morning, and I gotta fix the dreaded exhaust

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