JDM S13 CA18DE Camahaft Specs Qstn

[exacyzm]

Firstly I'd just like to say hi to you all, this forum has got lots of great information.

I would like to know what the camshaft specs are for the JDM S13 CA18DE. From what I can find, it appears that some sources suggest the intake cam has a duration of 240 degrees and 7.8mm lift, however other sources state 248 degrees duration and 8.5mm lift.

The exhaust cams appear to be all the same specs (248 degrees duration, 8.5mm lift) regardless of the origin of the engine (JDM/USDM/AUS/EURO).

I am hoping someone here has a FSM for the JDM S13 CA18DE (or knows offhand) and can find this info for me.

Thanks in advance for any assistance.
Modified by exacyzm at 3:06 AM 4/20/2009

[themadscientist]

You are in luck.

[exacyzm]

Thanks for the prompt reply. I can't see where the duration & lift are definitively stated on that image though.

I can see '8.5mm' is stated in the first table, perhaps that is the lift?

Also that table looks like its for the CA16DE and CA18DET, or am I reading that wrong?

[mbmbmb23]

http://www.tomei-p.co.jp/_2003....html

[exacyzm]

TMS - does (in the first table) the 64 indicate a 256 duration intake and the 62 indicate a 248 duration exhaust cam for the S13 CA18DE? It also appears all the cams have 8.5mm lift, is this correct?

mbmbmb - thanks for the table I have seen that before, but I know the specs of the CA18DE's camshafts change depending on country of origin, and I'm unsure which country those specs from Tomei refer to. I'm specifically interested in the JDM version of the CA18DE that came out in the S13 Silvia.

[mbmbmb23]

TMS - does (in the first table) the 64 indicate a 256 duration intake and the 62 indicate a 248 duration exhaust cam for the S13 CA18DE? It also appears all the cams have 8.5mm lift, is this correct?

mbmbmb - thanks for the table I have seen that before, but I know the specs of the CA18DE's camshafts change depending on country of origin, and I'm unsure which country those specs from Tomei refer to. I'm specifically interested in the JDM version of the CA18DE that came out in the S13 Silvia.

That chart is from Tomei's Japanese website.

[niscort]

from the S13 manual...

[exacyzm]

Thanks very much for that.

If I was to replace the standard cams with for example Tomei 256*/8.5mm lash style cams, could the new cams be dropped straight in, or do I have to get the head tunnel bored (or similar) where the cams run to suit the new cams to ensure they sit and run perfectly?

[r34 gtr]

They should just drop in.

[exacyzm]

^Thanks.

Does anyone know how the power band will be affected when changing from standard cams (240*/7.8mm inlet & 248*/8.5mm exhaust) to a set of Tomei poncams (256*/8.5mm In & Ex)?

Standard cams make max power at 6400 rpm and max torque around 5200rpm, so I would expect this to be shifted up slightly, but how much?

Anyone have any before & after dyno graphs?

Lastly, when you guys do the camshaft caps back up, do you use a torque wrench and tighten them to FSM specs or do you slightly over tighten, or just use a normal ratchet and nip them up evenly and firmly?

[mbmbmb23]

^Thanks.

Does anyone know how the power band will be affected when changing from standard cams (240*/7.8mm inlet & 248*/8.5mm exhaust) to a set of Tomei poncams (256*/8.5mm In & Ex)?

Standard cams make max power at 6400 rpm and max torque around 5200rpm, so I would expect this to be shifted up slightly, but how much?

Anyone have any before & after dyno graphs?

Lastly, when you guys do the camshaft caps back up, do you use a torque wrench and tighten them to FSM specs or do you slightly over tighten, or just use a normal ratchet and nip them up evenly and firmly?

New cams with old caps....I would just torque them. Make sure you keep the caps in the same exact locations facing the same direction from when you uninstalled them, they were bored out that way.