Forums/Z31P/z31-performance-upgrade-forums engine-mechanical-aa/i need advice on cams
Imported from Z31Performance.com Forums{{#if:GABBY OLUONYE| — original post by GABBY OLUONYE}}{{#if:2008-01-07 12:07:55|, posted 2008-01-07 12:07:55}}{{#if:9| · 9 post{{#ifeq:9|1||s}}}}{{#if:/Z31performance_archive/forum/z31-performance-upgrade-forums/engine-mechanical-aa/3934-i-need-advice-on-cams.html|
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GABBY OLUONYE: (2008-01-07 12:07:55)
i need some advice on my z31 drag car project.this car has a stock bottom end right now and i am running 850cc injectors 75 shot of nitrous, t3/t4 turbo with stage 5 back end .63 a/r and.50 a/r compressor,iam also running a back half with aford 9 inch witha3.5 ratio.i live in the island of Grenada where i am the only person running a z 31 in this type of application .i also have a home made intake ,a 60mm throttle body,i have just purchased a new cam from schiender 294 duration and i am a bit confused cause someone who is supposed to be an expert in the z31 arena says that my cam is too big .this is a full race application iam a newbie, so excuse my ignorance. also my heads are ported.please respond asap
OrionMCP: (2008-01-07 14:36:56)
sorry, dont know a whole lot about cam grinds but from the list of stuff youve done, Id hardly consider you a newbie, any chance you can get some pics of your rearend swap? I would be really interested to see how you set that up. [archived image: smile.png]
Steve88t: (2008-01-07 15:27:22)
The engine can be made to make use of those cams. But at a minimum you will need valve springs to deal with the rpm.
The more you improve the airflow, the better you will be able to use the cams. A safe limit on a stock bottom end is 7200-7500rpm. I would not go beyond that without replacing some parts.
1SickZ: (2008-01-07 15:41:01)
I too believe that it is too big of a cam.
Matt89: (2008-01-07 23:32:45)
I have jwt s2's in stock heads and im starting to think they are not helping much without a port job. Im considering putting stock cams back in. Plus im getting tired of the added lifter noise.
2+2turbo: (2008-01-08 00:25:58)
you should have read before you went ahead and installed those … its been stated in a few threads a while ago that cams without porting is useless.
Taris Blue: (2008-01-08 01:50:31)
[quote]2+2turbo wrote:
I have jwt s2's in stock heads and im starting to think they are not helping much without a port job. Im considering putting stock cams back in. Plus im getting tired of the added lifter noise.
you should have read before you went ahead and installed those … its been stated in a few threads a while ago that cams without porting is useless.
not true at all…my stage 1 schneider cams made a very noticable difference to my top end power. The main problem is that it is VERY EASY to go too agressive…pretty much a stage 1 grind from any company is usually as agressive as is useful. With stock heads you can actually lose power with going to big for sure. Also I would think that since a duration of 280/280 is already considered a race grind, 294 has to be WAY too much…then again I don't design cams, I'm just a rational person.
88sinZ: (2008-01-08 03:58:00)
matt ill buy your cams! :-)
considering the casting flash is similar to small pebbels lining the ports, even getting rid of the flash alone i imagine would help
Matt89: (2008-01-08 14:28:13)
OK, the cams are definitely coming out…but im not sure if i want to sell them yet. I would consider a trade for a set of jwt s1's. 88sinz, pm me with an offer and i'll let you know.