i wanna get a set of prolly crower cams, i want something that will make a little more power to my car now, but will still work good when i get my drag 3 setup later this summer, please help, i was thinking either the crower 402 or 403's, my car is an rs by the way, oh and wheres a god place to get comptech axle back exhaust??????????

 

There are no NA cams that will work well with turbo, AFAIK. Too much overlap. Either leave the cams stock or get ready to change them back out when you get turbo. Also, I have heard tons of stories about crowers breaking (do a search) so I would recommend something else.. Skunk2 perhaps. HTH

 

I think the crower 402's are okay for turbo, but stay away from the 403's

 

stock

 

nuff said

 

Stock Cams man!!

If you can't wait until summer for some more speed, and you want to waste money now for a little horsepower, you are very impatient!!!!

Stay with the stockers and save your money to build your motor and be able to run more boost.

Later,
Jon

 

if youre going to go turbo you need to build up for that, forget the NA buildup, ie intake and header and exhaust will all be different, so might as well just start prepping the car for turbo. stock cams are fine w/ turbo.

 

Well first the cams are not gonna break. Its kinda like saying a wheel broke cause its cheap when in fact in wasnt mounted straight. And I dont know what poeple are talking about using the stock cam for best performance...maybe at 2000 rpms, but how many turbos are on at 2K??. Last I saw a VTEC head kicks *** when the VTEC engages at high RPMS. I say get a turbo that comes on at 3500 and full by 4000 and you could get away with the 403's probably maybe 404's

Heres check this out a 91 LS turbo..7psi


A GSR running at 7psi


As you can see the bigger cam only extended the breathing life of the head

 

blow by sucks

 

if you have the cash get a set of custom spec cams from crower. somthing with high lift low duration and less overlap.

BUT i do recall someone on this message board making some insane power with 62403 and lots of boost!

 

Call Crower.

 

the problem with big cams and turbo is the blow by that occurs due to overlap.


But turbos love duration because it gives even more time to suck in loads of air.


So I think that most of the time you here people talking about not getting big cams for turbo they are talking about big vtec cams because their durations are so huge that even with cam gear tuning you can't get rid of the large amount of overlap. This is not as big a problem on non-vtec cams because they simply cannot run as much duration(on a street car) as the big vtec cams do and so alot of the overlap can be taken out.


So for the people that said the bigger cams are a bad idea let me know your reasoning.





[Modified by Muglit, 4:51 AM 3/6/2002]

 

a friend of mine had cams designed for his turbo application and had them ground by web cams. gained 50 whp (fully built b16a2 and a lot of head work)

You could run the 403's with a turbo... but it will take a lot of tuning and ecu work

 

Re: which cams for N/A now, but turbo later? (Acura_I-RS) (MaliceGSR)

stock

 

also, i had my ecu chipped from pyr racing, can i still use it when i start boosting???

 

The non-vtec Crower Cams have not had issues...

but EVERY VTEC cam from Crower that I have heard about was a broken one.

Crower does not know how to make any parts for a vtec car.... Go Skunk2, JUN, Toda... not Crower...

So since you are not VTEC.... You choose... I wouldn't trust them though...


[Modified by GSR_Hacker, 2:27 PM 3/6/2002]

 

I know this thread is for the Non-Vtec, however information like this does filter into poeples mindset that takes things for face value. These incident have been discussed at great lengths in the past. The VTEC cams that broke were the first batch and some were shown to be installed incorrectly. Crower did the right thing and paid for at least the cams and fixed the problem. I have not heard of anymore cams breaking on street driven cars since then. I say street driven, because with how much load a drag engine is subjected to, anything can break on them.

Please takes things with a grain of salt in here and get a second opinion always

 

What about good cams (ITR, Skunk2, Jun, Toda) for a supercharger, and not a turbo...I'm thinking ITR would be no problem since a lot of R's seem to be supercharging.

 

have you looked into turbo cams especially made for turbo. seriously dont waste your money building up NA if your going to go FI later, summer is just a couple months away.

 

As another thought, people in the past (such as with JRSC) were talking about using the bigger exhaust cam, but leaving stock intake. The higher lift of exhaust cam could help with "exhaust scavenging."

I never really followed up, since I never went FI, but something to consider. For example, get the ITR Exhaust cam and leave stock intake cam. Haven't heard if this was particularly helpful or not? Also, I think that once you're turbo, you can just make more power with more boost or whatever, so the extra 5 HP from the cams is insignificant?

Thoughts?

FB

 

Turbo motors like big lift and short duration, overlap is the variable, you can change it with cam gears on a DOHC motor. Look at the crower turbo cams vs NA. The duration is short and the lift is damn near that of the all out drag profile (62405A). I have 62403's and like em, but no boost yet. Duration on the 62403's isn't so severe that you can't reduce overlap enough, it just doesn't have the big lift.

 

berkel-

I think the cams would give alot more than 5 HP because the increased duration and lift would allow ALOT more air on a turbo motor than an NA motor so the potential increase in power is alot more than the increase gained on an NA motor.


Acura_I-RS-

I just went to crower's website. It seems they just added the perfect grind for what you want, 62402T. It has a little more duration and a lot more lift than your stock cams so a little better NA performance but were designed for turbo so that works for your future plans.


[Modified by Muglit, 10:44 PM 3/6/2002]

 

wow the new 402T's have a higher lift than the 404's and a really short duration.

those would be an excelent choice for turbo.

 

Looking at the 402T's specs I wonder if this cam would not be perfect for a stock redline non-vtec primarily concerned with street performance with a little drag strip time.

I say this because the duration is only slightly more than stock thus eliminating the ill effects to low rpm power of high duration, while having a large lift to keep the engine breating to ~7000

Thoughts?


[Modified by Muglit, 10:59 PM 3/6/2002]