SOHC rev limits
 

i have a y7 head that im thinking of using along with a bisi cam.

how high do you think its safe with stock springs/retainers ? 7500k ? stock is like 6600k on the y7. :-\


are z6 springs any better ? i have a whole head thats fucked but with good springs/retainers.

Re: SOHC rev limits
 

Don't use a almotor cam in a turbo motor. I seen people push more then that on stock y7 head.

Re: SOHC rev limits
 

All motor cams are good for boost.

Re: SOHC rev limits
 

Ahh no there really not, they blead off boost. Bisi knows his stuff, if you call him up he will make a cam for your setup.

Re: SOHC rev limits
 

REALLY? ENLIGHTEN ME!
Show me any proof and don't type me a essay about why you think they suck.

Re: SOHC rev limits
 

i talked with bisi and he said he will make the cam fit my setup. and ill just take his word on that.

cam isnt really the issue here, its the springs.


are the z6 springs worth swapping ? (time and effort)

Re: SOHC rev limits
 

If you talked to bisi, why didn't you ask him about the springs?

Re: SOHC rev limits
 

This is what bisi him self told me when I call for a cam. The motor that it was going into was a y8 with a 16g and a na cam. Boost would take for ever to come in and would just die off. Bisi said the cam was bleading off the boost.

Re: SOHC rev limits
 

Honestly if you're going to go through the trouble and the immensely large sum of money that it costs to have Bisi himself design you a cam, why would you not in all honesty want to upgrade your valves and springs/retainers? And FWIW, z6 springs are a different length than most other D-series springs I've seen (except for maybe a y8), so you would almost want to assume them being longer than the y7's as well. Upgrade everything else, and if you can't find the parts to do so, then you might want to consider a change in head design. :P

Re: SOHC rev limits
 

those heads wont really flow much over ~ 7k w/o extensive port work and properly tuned intake manifold and exhaust system


SOHC allmotor cams suck for boost BECAUSE 2 resons


1 all motor cams have alot of OVERLAP, aka when the intake valve and exhaust valve are open at the same time, helping scavange excess exhaust gasses due to the vacume created after every exhuast pulse, wich also pulls in extra intake gasses, causing the whole intake charge to pass through the combustion chamber


2 SOHCs have no adjustability in the overlap, DOHC arnt as bad, because you can dial out the overlap with adjustable cam gears. therefore you have a large lift and duration with less than recommended overlap, POSSIBLY produceing more hp, but not necessiarly.




sean

Re: SOHC rev limits
 

cam isnt expansive. its like 225 + shipping. reason im going non vtec is b/c the sohc vtec cam from him is like 380 or w/e.
bisi > zex

z6/d15b springs=y8 springs=y7 springs. ( = meaning interchangeable ) 8)


again, are z6 springs any better then the y7 once ?

slo_crx1, i forgot to ask him when i called, and its hard to get a hold of him. :-\


btw, overlap is good. ;)

Re: SOHC rev limits
 

Is it a hole y7 setup?

Re: SOHC rev limits
 

Re: SOHC rev limits
 

Here's my opinion. If your going to boost it, the last thing you really need to worry about is how high you will rev and what cam/springs to use. My car had a completely stock Z6 and the only reason I ever needed to rev higher was because first gear seemed pretty short when I was at the track on my slicks (still worked pretty well). I might have been able to lower my ET a little bit if I had another 1,000rpms to play with, but other than that when daily driving or street racing going to 7k was perfectly fine. So just think about if it's really going to be worth it in the long run before you spend all the money for a little extra rpms. Oh and my cam/springs were free because the motor was stock. ;)

Re: SOHC rev limits
 

I wouldnt rev it under 9,000 they make the most power after 7k O0

Re: SOHC rev limits
 

no, z6 bottom end.

i know what your saying. and i know i should hold off until i get everything put together and see how it all works like stock, AND then upgrade. :y
thats why i asked are z6 springs better then y7 springs ?, because i have some that are "free," but im yet to get an answer. ----, there is more talk about the cam here then the springs. lol



i dont even know what to say to this, well, maybe an LOL is fitting enough ? ???

Re: SOHC rev limits
 

its sad how no one knew. i guess flaming is the only thing you guys are good for. lol j/k



called bisi today to order some springs and he said that z6 springs are the same as the y7. (cam will have to wait. :()

Re: SOHC rev limits
 

haha, i take my b2/y7 to 6800 daily. all stock btw. oh i also seen an article that i believe was the bisi you talk about in a tuner mag today that i was browsing through. never knew he was banned from drag racing for a short time.....or still is??

Re: SOHC rev limits
 

I know nothing about hondas, nor do I care to. however, valve overlap is awesome...for NA. for turbo you want minimal valve overlap. boost takes the place of vacuum with a turbo, therefore you dont have to worry about scavanging.

sorry, still no help on the valve springs.

Re: SOHC rev limits
 

My stock turboed d16y8/z1 bottom end seen 8500 rpms all the time for 8 months of beatings.Only reason it broke was
the ring lands.So the stock head can take a beating.It pulled hard all the way too the rev limit of 8500.

Re: SOHC rev limits
 

My stock z6 head sees 8,000 rpm everyday. Maybe I shouldnt beat on it that hard? W/E I have a few spares and it still makes all kinds of power so why not?

Re: SOHC rev limits
 

Actually that's not entirely correct. Everyone likes to assume that overlap is bad on a turbo car, even though a lot of results tend to say otherwise in some cases. If you're running a log style, more than likely you will benefit from some overlap as it helps promote a scavenging effect that's typically not present in log setups. Ram horn and equal length styles won't really see any benefit because of the way the exhaust pulses and scavenges. What little loss in boost pressure you see with an extra few degrees of overlap can usually be made up by turning the pressure up to compensate, and 9 times out of 10 you will gain some power out of it.

Re: SOHC rev limits
 

sweet i reved my y7/z6 mini me to 8200 all day for 3 mounts until i melted a piston cuz i had a ricer egay chip and it was lean.. but no reason to rev if you have a nice small fast spooling turbo i had a gay egay t3t4 so i was keeping it spooling so wehn i shif i have more boost..



piston owned bye lean burn i was racing on the freeway pulled to 132mph and died only 6psi lean = BAD :S

Attachment 20642

update
springs as i know i took a few heads apart and pulled out spring
the hx y5 head springs look about the same as z6 ones im guessing y8 are same too but y7 ones look a a little different never pulled them out the y7 to closley compare

Re: SOHC rev limits
 

Thats what you get for buying a egay chip :P. You should always have your setup tuned!

Re: SOHC rev limits
 

my stock zc sees 7600 a zillion times a day. after driving in my b16 del sol, i end up pegging the hell outa my sohc zc every gear lol. so used to taking my other car to 9400, kinda hard to remember to shift so much earlier.

Re: SOHC rev limits
 

thats why i got my ---- together and tune it my self O0 :P :P :P :P