Rb20/25/26 cams

Post by **Sil240** » Mon May 10, 2004 2:20 pm

Does anyone know if the all the RB20/25/26 cams can be swapped with each other?Does anyone know if the Rb25 or 26 cams are more agressive and if they'll work in a RB20?

Post by **Yellow4g63** » Mon May 10, 2004 2:20 pm

Yes you can run gtr cams in the RB20 head. You can also use the springs. And if you want to go all the way you can dwap over all the GTR rockers an lifters too but you have to machine the head.

Post by **bobdhead39** » Mon May 10, 2004 2:20 pm

Sil240 wrote:Does anyone know if the Rb25 or 26 cams are more agressive and if they'll work in a RB20?

And can anyone be more specific? Both RB25/6? Or just one?

Post by **Sil240** » Mon May 10, 2004 2:20 pm

but i thought the rb valve train was cam on bucket?or is that just the 25?

Post by **GTR Shop** » Mon May 10, 2004 2:20 pm

You can use any cam i any head.You can also run exhs as inlet, but not other way around due to no CAS drive.

Post by **Sil240** » Mon May 10, 2004 2:20 pm

which should i get???

Post by **GTR Shop** » Mon May 10, 2004 2:20 pm

Engine Cam Deg lift (mm)

RR20DE IN 232 7.3RB20DE EX 240 7.8RB20DET IN 240 7.8RB20DET EX 232 7.8RB25DE IN 240 7.8RB25DE EX 240 7.8RB25DET IN 240 7.8RB25DET EX 240 7.8RB26DETT IN 240 8.58RB26DETT EX 236 8.28

Remeber, uou can use a exh cam in inlet.

Of you cango aftermarket and pick your duration/lift

Post by **WDRacing** » Mon May 10, 2004 2:20 pm

I thought the RB20DE had 248 Dur cams?

Post by **GTR Shop** » Mon May 10, 2004 2:20 pm

Nope.. not according to any of the lists I have here.. they all say the same.

Post by **WDRacing** » Mon May 10, 2004 2:20 pm

One of the cheap mods we were doing in Oki was to swap the DE cams into the RB20 do to a longer duration. We got noticeable results.

Post by **GTR Shop** » Mon May 10, 2004 2:20 pm

You're going backwards with the inlet cam.... less lift and duration.

Post by **PROJECTRB240SX** » Mon May 10, 2004 2:20 pm

WOULD A RB25DET EX CAM AND A RB26DETT IN CAM BE A GOOD COMBO FOR MID TO HIGH RANGE POWER?

THE REASON I'M LOOKING FOR MID-RANGE POWER IS THIS IS A MORE OF A STREET/DAILY DRIVER AND I'D RATHER HAVE POWER AT CRUSING SPEED THAN DOWN LOW OR REALLY HIGH.

Post by **Sil240** » Mon May 10, 2004 2:20 pm

so if i put a exhaust rb20de cam in my det i dont have to change any springs, lifters or anything i can just drop them inI wont have to worry about valve float right

The RB isn't a interference motor right because its a hemispherical chamber?

Post by **WDRacing** » Mon May 10, 2004 2:20 pm

The RB20 isn't intereference, I don't know for sure about the 25 and 26. I'm fairly sure the 26 isn't a non interference type.

Brian

Post by **GTR Shop** » Mon May 10, 2004 2:20 pm

Sil240, a DE ex in the inlet of your DET.. yip.. bolt her up.

Post by **93RPS13** » Mon May 10, 2004 2:20 pm

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

Post by **WDRacing** » Mon May 10, 2004 2:20 pm

Man, I can't believe I actually installed a smaller intake cam on my RB20. It just goes to show you can't just listen to someone and assume they are correct. Although the source was reliable I thought. The guy had built several high HP rotaries.

Brian

Post by **GTR Shop** » Mon May 10, 2004 2:20 pm

How many cams did his rotor have?

BTW, rotary porint is about increasig duration of the port, and the widening of them is effectivly the lift

Post by **93RPS13** » Mon May 10, 2004 2:20 pm

the 248 is the R31 RB20 cam...

Post by **SeVa-S13** » Mon May 10, 2004 2:20 pm

A set of RB25 cams sounds nice for my 20. Now to get someone to part with them...in about a year when I have the money.

Post by **GTR Shop** » Mon May 10, 2004 2:20 pm

Let me know in a years time as I've got some here

Post by **WDRacing** » Mon May 10, 2004 2:20 pm

GTR Shop wrote:How many cams did his rotor have?

BTW, rotary porint is about increasig duration of the port, and the widening of them is effectivly the lift

He has two GTR's that aren't slow either...just not as quick as his FC and FD.

Post by **Sil240** » Mon May 10, 2004 2:20 pm

Thanks guys i really apreciate itHey quick question has anyone bought anything from Venus-Auto??

Post by **bobdhead39** » Mon May 10, 2004 2:20 pm

Yes, my rb20det, runs great, idles really good, can send vid clip of it running if you want. Compression was great, and after 3k on this oil change it is still clear. Very pleased.

Post by **Sil240** » Mon May 10, 2004 2:20 pm

bobhead you got you rb from venus?I think im gonna cancel my order with Jarco and order it from venus cause jarco want 3 times what venus wantsbut no Diff and rear brakes and stuff

Post by **bobdhead39** » Mon May 10, 2004 2:20 pm

Yes the motor I have is from Venus. $1200 + Shipping to San Diego. Ended up being about $1700. I think shipping for you will be the expensive part.

Post by **Sil240** » Mon May 10, 2004 2:20 pm

oh ok cool but i think it'll still be cheaper than jarcoim gonna give them a call today

Post by **goofynick6** » Mon May 10, 2004 2:20 pm

So, just to be sure..

The RB20DE cams have a smaller duration on the intake than DET, and the exhaust is the same as the DET. The only difference would be the R31 intake cam which has 8 degrees more than the 20DET cams.

So, not worth a swap unless you have an R31 intake cam...right?

Nick

Post by **GTR Shop** » Mon May 10, 2004 2:20 pm

Exactly.

Post by **goofynick6** » Mon May 10, 2004 2:20 pm

Thanks:)

Rb20/25/26 cams

Rb20/25/26 cams

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Re: Rb20/25/26 cams

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