what about a stock jdm exhaust cam used on the inlet, i have one of them lying around
what about a stock jdm exhaust cam used on the inlet, i have one of them lying around
what is the main advantage of fitting the ex cam and pulley? Better mid range? More top end? More over all torque? Etc?
Thanks
mid and top
Hi mate.Originally Posted by JCD
Drilling the 5 holes a bit larger gives you some degree of adjustment.
It doesn't look bling but it works
The stock pulley has a collar that centers it very well over the shafts end.
Also it's somewhat awkward to adjust; you need to be familiar with dial gauge and have a stable fixture to attach it to the head.
Its not bling but if it works then thats all that counts
That other Jun Adjustable Sprocket didnt go to useEnded up selling the 200
Here it is;
http://www.nissansilvia.com/forums
Here are all the Spec's, i only included the spec's that i needed in my thread so i didn't include the EURO CA18 spec's but here they are.
EURO spec CA16DE....
In lift - 8.5mm
Ex lift - 8.5mm
In duration - 248
Ex duration - 248
In opens - 15 BTDC
In closes - 53 ABDC
In center lobe angle - 109deg
Ex opens - 59 BBDC
Ex closes - 9 ATDC
Ex center lobe angle - 115deg
EURO spec CA18DE...
In lift - 8.5mm
Ex lift - 8.5mm
In duration - 248
Ex duration - 248
In opens - 16 BTDC
In closes - 52 ABDC
In center lobe angle - 108deg
Ex opens - 50 BBDC
Ex closes - 18 ATDC
Ex center lobe angle - 104deg
EURO spec CA18DET...
In lift - 7.8mm
Ex lift - 8.5mm
In duration - 240
Ex duration - 248
In opens - 0 BTDC
In closes - 60 ABDC
In center lobe angle - 120deg
Ex opens - 59 BBDC
Ex closes - 9 ATDC
Ex center lobe angle - 115deg
JPN spec CA18DE S13...
In lift - 7.8mm
Ex lift - 8.5mm
In duration - 240
Ex duration - 248
In opens - 0 BTDC
In closes - 60 ABDC
In center lobe angle - 120deg
Ex opens - 59 BBDC
Ex closes - 9 ATDC
Ex center lobe angle - 115deg
JPN spec CA18DET S13...
In lift - 7.8mm
Ex lift - 8.5mm
In duration - 240
Ex duration - 248
In opens - 0 BTDC
In closes - 60 ABDC
In center lobe angle - 120deg
Ex opens - 64 BBDC
Ex closes - 4 ATDC
Ex center lobe angle - 120deg
Courtesy of Niscort
Last edited by D_Stirls; 16-12-2009 at 16:57.
ThanxSo the dark blue line was if I just put exh cam with stock gear, no need to rotate 1 tooth?
No, D_Stirls setup an adjustable cam gear, retarding inlet cam in 5 degrees (dark blue line).Thanx
So, using stock gear the cam get his maximum lift at 130° which make it
undriveable. Then, shifting 1 thoot clockwise the stock gear respect to the belt,
the maximum lift is achieved at 115°. Now, we need the maximum lift at
120° to let it as CA16 inlet cam (tested improvements). Then we need to
correct this 5°, retarding by, and here is the JDC great contribution,
drilling a bit larger holes on the stock gear and rotating the gear clockwise
respect to the cam (this time it means retarding).
BTW, talking about shifting 1 thoot the cam&gear respect to the belt, advancing is achieved rotating clockwise, and retarding by rotating anti-clockwise (respect to belt). It is, in reverse way that when we setup an adjustable pulley, where the gear is moving respect to de cam, not to the belt. I think there may be some confussion.
¿ JDC, just to be clear, may you tell us exact diameters you drilled out ?.
¿ If above is correct, this mean that we can use it as a guide to the swap,
without unsing a dial gauge at all ?
See post #1
If you're refering to the drilled stock pulleys I'd say no go
It will never be precise enough. You drill a hole with a 8mm drill and end up with a 8.07mm hole. Whats so frightening about dial gauges? Buy a pink one then
Thanks for the demystification
Is hard to find good answers when the info is completely disgregated.
I'll get an adjustable pulley (obx or tomei) to do this.
Why pink men? i had never like it, and will never like me again
Last edited by DLP; 08-12-2008 at 20:17.
I'd say get a dyno instead of dial gauge
That was me being sarcasticWhy pink men? i had never like it, and will never like me again
People get stuck with plug-and-play features and tend to forget the real thing.
Don't laugh, I've been thinking about the use of a truck or bus retarder, hydraulic or eddy current, or a large electric motor that can be rewired as alternatorI'd say get a dyno instead of dial gauge
lol, perhaps something for another thread JCD?
The exhaust cam on inlet side is common in other car circles as well. I bought an old VVT exhaust cam and adjustable pulley's for my metro gti k-series engine. Never got round to fitting it as I had my head needing to be heli-coiled and sold it before I got round to it, but was a reasonably well known mod.
hi, been reading this for ages, good stuff,
am i correct in reading that the standard inlet cam can be retarded 1 tooth to acheive much the same effect as an exhaust cam 1 tooth adv. ?
No, the std intake cam is of no use really - you may be able to time it a degree or 2 with a vernier pulley to get a bit more out of it.
The duration of the stock int cam is 240deg, the exhaust cam and the CA16 cam are both 248, but the timing is different meaning the exhaust cam needs to be timed if you are to use it as an intake cam, whereas the CA16 int cam drops straight in.
Hope that makes sense.
For the record when I put an untimed exh cam in it was super flat to about 4.5k (might well have been belching loads of black smoke out the back) then at some revs around 4.5k it would launch itself.
What sort of gains are we talking here, and how does it affect the power through the rev range but using the ca16 or exhaust cam?
The Euro CA18DET Exhaust cam has the same Duration, lift and base timing as the Euro CA16DE Exhaust cam. The reason the CA16de cams were seen as an upgrade is because if you drop both the inlet and exhaust in then it gave you the 248 x 8.5 which is what you will achieve if you do the exhaust cam mod. So there is no difference between using the full set of CA16DE cams (inlet and exhaust), fitting a EDM CA18DET or JDM CA18DE cam on the intake as all these cams have the same specs and base timing.
P.S. JCD i replied to your thread on NS.com, that thread was more about the difference between the CA16de cams (replicated using cam gears) and the JDM CA18det Exhaust cam. The base line wasn't with the standard cam specs it was with the Exhaust cams fitted but on 0 degrees, but the car definitely make a lot more torque now that what it did with the standard cams
Hi just one last question ... the ex. cam im going to fit to my car is of a jap spec head...sooooo... does that mean it will drop straight in ???
or have i got my sums wrong..
OOOPS!!.... nevermind.... was half asleep... all clear now
Last edited by Quest; 12-12-2008 at 18:33.
wonder why it never came off ? Piper seemed to work wonders on Tones old 20G combo
I'd think reprofiles with proven performance and at a reduce price would be a hot seller
can someone please advise me which is the best oem drop in combination using CA18DET exhaust cams, i have a euro spec and a jdm spec cam lying around. which is the best combination to use and with which cam pulley/gears? dropped in using the standard exh cam pulley/gear.
from what i've read i'm not sure which is most diserable.
i think its slightly leaning towards:
-a jdm exh cam on the exhaust side with stock cam gears
-and eudm exh cam on the inlet side with eudm inlet cam pulley/gear attached ?
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