RB20DET cam question YES I SEARCHED

Discuss the RB20, RB25 and RB26 series engines.
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Project_RaceBreed
Posts: 21
Joined: Tue Jan 30, 2007 9:59 am
Car: RB20DET Powered 240sx hatch

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I was wondering if the rb20det Intake and exaust cams where the same or not. Any one know the exact specs. I am wondering if i could do a mild cam upgrade using 2 exaust or intake cams in one head.


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Coolwhip
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Joined: Fri Feb 06, 2004 7:29 am
Car: RB26 Raw Brokerage War Machine
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the intake cam does not have provision for a CAS, so having one (intake cam) installed on the exhaust side would just cause more variables to be addressed.

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DriftingisLame
Posts: 974
Joined: Wed Feb 02, 2005 1:41 pm
Car: '91 240sx coupe, rb20det

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Yes and I believe the exhaust cam is a smaller duration and lift than the intake cam, making that a pointless upgrade.

I've searched the **** out of the specs for stock rb20 cams and found mixed results. Some say they're both 240 duration with a 7.5mm intake lift and 7.3mm exhaust, some say 240 intake 232 exhaust, Every new set of specs I've found points to the intake cam being larger though.

I've seen large gains from properly adjusted aftermarket cam gears if you're looking to doing a budget cam upgrade.

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Carl H
Posts: 5985
Joined: Mon Aug 04, 2003 4:09 am
Car: 1995 Nissan 240SX SE RB30DET

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stock silvertop intake cam is 240* with exhaust being 248*use an intake cam from a redtop rb20 for 248* duration...but may not be worth the trouble.

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Project_RaceBreed
Posts: 21
Joined: Tue Jan 30, 2007 9:59 am
Car: RB20DET Powered 240sx hatch

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Well i have a silver top and an extra set of cam laying around so i just figured id ask. Thanks for the input.

danb8586
Posts: 15
Joined: Tue Jan 10, 2006 4:04 pm
Car: 92 240sx

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what about just getting an exhaust cam and putting it on the intake side considering its 248 vs 240 kinda like the what you can do with a ka and just degree it.

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rbsileighty
Posts: 1694
Joined: Sun Feb 09, 2003 8:10 am
Car: 92 S13 Hatch w/ RB20 & 05 Audi S4 Avant 6MT

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Here are the stock cams for a lot of cars (including the RB's) from Tomei. I found this a few years ago... not the easiest thing to find. Had to put it in Excel to make it fit...



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