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backfiring through carb and exhaust??

Started this discussion. Last reply by Anthony Nov 21, 2014. 5 Replies

z24 cracked block

Started this discussion. Last reply by TigerRacing Nov 15, 2011. 41 Replies

 

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What is your profession? (not required, just if you want to share your knowledge)
michelin tire
About Me:
i know not nissan but powered by nissan(fastest sidekick around).i`ve been racing this rig a couple years with the napz engine in it
How many 720's or other Nissan trucks do you own? What years and types?
none at moment have had or drove about 5 over years
What modifications have you done to your truck(s)
motor is 40 over with flat tops ( out of 89 240 sx)
292 web cam
ported and polished,3 angle valve job
holley 2300 carb, 350 cfm(with one inch spacer plus nitrous plate)
big big shot of nitrous( between 60 and 120hp depending what i`m doing)
header and staight pipe for exhaust
31x10.5 15"bfg mud terrain front
31x13.00 15"bfg mud terrian on rear and welded diff
How many miles would you travel to attend an all 720 truck meet?
50

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z24 block cracks

Posted on January 19, 2010 at 12:51pm 2 Comments

anybody ever here of the z24 block cracking from waterjacket to the head bolt holes and will this hurt them? i`ve found 7 on race block with just my eye after block decked and 2 or 3 on two other blocks i`ve checked since one with naked eye other with magnaflux.any suggests or comments appriecated
james

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At 11:37pm on February 15, 2009, datzenmike said…
The rotor directs the intake and the exhaust spark to intake #1 and exhaust #1 and they fire together. Then rotates counter clockwise skipping the next terminals and lines up with intake #3 and exhaust #3, skips the next one and fires In. #4 and Ex. #4 and finally In. #2 and Ex. #2. The firing order is 1 3 4 2.
At 2:06pm on January 9, 2009, TigerRacing said…
Sorry, that is Taylor, not Jacobs, brain fart...
At 2:05pm on January 9, 2009, TigerRacing said…
My plugs wires are Jacobs 8mm Spiro-Pro (straight boot). They are great and have lasted many, many years. The plug ends are silicone and molded on, you cut/crimp length at the cap end to adjust lenth. I just used a universal V8 set and cut them to length. All you need is a cheap plug wire crimp tool available at most part stores.

http://store.summitracing.com/egnsearch.asp?N=700+400235+301889+4294891681+4294908395+4294920241+115+4294851167&autoview=sku
At 7:50pm on November 17, 2008, TigerRacing said…
This is a fixed step type, I think adjustable in 3 degree steps, but cheaper than the fully adjustable type.
http://www.zccjdm.com/catalog.php/azcarbum/dt43033/pd858308/KAMEARI__8_HOLE_ADJ._CAM_GEAR_
At 12:34am on November 17, 2008, Alicto said…
I had a 292 before in my truck And it did pretty good @ 6500 rpm. To me I think the 292 web cam had really good bottom end. But 300 and 310 web cams have some wicked top end. I am running a Z22 w/ 300 web cam, mikuni 44's, pacesetter headers, and MSD blaster 2 coils. Everything else is stock and my truck does its best at 6500 to 7000 rpms.
At 12:26am on November 17, 2008, Alicto said…
I am running the stock Z22 pistons. My Dad has a 89 Hardbody though w/ a 300 Web cam and KA24 pistons and his truck revs up to about 7500 rpms. But we shift @ 7200 rpm.
At 2:48pm on November 14, 2008, TigerRacing said…


This is the one I designed, differs from ratdats in that my adjustment screws come in from the rear, that way I don't have to bore as big a hole through the gear for the hub to fit through and the main bolt will sandwhich the gear and hub together rather than just the hub. I'll only use four screws, datrats old design used four, now they use eight. I think they had problems with the gear working loose from the hub, and that's why they pulled it off the website for a while, then it came back on with eight screws... My biggest problem with my design is clearing the cam tower ends behind the gear. I plan on putting in countersinked areas for the screws to tighten in to in order to have the clearance I need...
At 7:23am on November 12, 2008, Alicto said…
Your welcome. If you have any questions feal free to ask. I used to run a bigger cam in my truck though on stock valve springs. I had a Crower 318. It had like a .515 lift. Then I had a 310 Web Cam. It has a .503 lift w/ 280 .050 duration.
At 7:32am on November 11, 2008, plumcrazy2 said…
what exactly am i looking for other than dyno and g-tech readings different unless dyno was with smaller dyno.or the feul mamagement system
At 12:29am on November 11, 2008, TigerRacing said…
.503 is a lot of lift for stock springs, I'd be really afraid of valve float at high rpms..

hey found this today, same guy you pointed me to on cardomain
At 7:27pm on November 10, 2008, Alicto said…
You can just use stock springs. I am running a 300 Web Cam on my truck w/ stock valves and valve springs. Nothing needs to be done to the head. I have a stock head Z24 w/ a 300 webcam. The specs on the 300 webcam is .503 lift and 260 .050 duration.
At 9:24pm on November 8, 2008, TigerRacing said…
Yeah, and turning too fast can even result in pulling the side out of the aluminum diff housing on those. I might not happen to you, just a heads up so if it happens, you know why...
At 9:13pm on November 8, 2008, TigerRacing said…
I head ya... Not sure when I could spend that much either.
At 9:00pm on November 8, 2008, TigerRacing said…
Well, I know what you mean, but with that cam gear you can tweak your cam timing to bring your peak power band up or down. Cheaper than buying several cams... You can adjust power band up for a wide open track, down for a tight track. It is expensive, but then again, everything is expensive when it comes to racing.
At 12:55pm on November 8, 2008, TigerRacing said…
Hey bud, in case you're interested, DatRat.com has the adjustable L series cam sprocket for sale again, they had discontinued them some time back, these work on the Z24 as well. This allows you to shave head/deck height and still degree the cam back in...
http://www.datrats.com.au/
At 6:46pm on November 7, 2008, TigerRacing said…
Holy crap, found him. Looks like he found a Z18e turbo setup, those are hard to find... bolt right onto a Z22/24. Love to find one myself.
At 6:37pm on November 7, 2008, TigerRacing said…
Thanks Bud! Uploaded some pics of my '86 that I rolled back in 2005... I'm rebuilding that one now with a custom long travel a-arm setup, that's where the new motor was going, but thinking of stuffing an Infinity 5.6L in it instead and putting a Ford 9in in back lol...
At 4:03pm on November 7, 2008, TigerRacing said…
did your computer crash, or did I talk you out yesterday lol?
At 7:39pm on November 6, 2008, TigerRacing said…
Can you point me to the pink turbo beast? Can't seem to find him!
At 6:45pm on November 6, 2008, TigerRacing said…
Saturn? Really? How did he figure that one out! Does it require any modifications? Drops in every hole? I haven't caught up to him yet, I'll have to check his truck and page out. So many people have joined it's hard to keep up.
 
 
 

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