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Old 07-08-13, 20:29   #1
elare69
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single cam vs twincam debate

single cam vs twin cam which is better ? is twincam cheating ?

twincam better my opinion
vl debate



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Old 07-08-13, 20:54   #2
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I like the single cam RB30 for the originality factor, plus it shows the ability of the builder/tuner to make more power with less 'potential' than say a twin cam

Only issue I see with going twin is adapting it to fit, especially for a 26 head which is apparently harder than the 25, plus the cost of finding one.
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Old 07-08-13, 20:55   #3
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SOHC was the Aussie spec RB3OT requested by holden for its simplicity, if 500hp is achievable for a road car then why would you want to complicate things with a higher maintenance spec motor that looks Japanese?
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Old 07-08-13, 21:25   #4
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Honest question and this is for the RB gurus out there, have you found a single or twin cam rb30 to make power more reliably? I know the twin cam comes at an additional expense but does it outweigh the fact it may last longer or be more efficient?

I love the good old single cam but you can't go past a twin cam rb30, it's like having a threesome every time you have sex. Having said that I still hold a higher level of respect for those pushing the single cam boundaries.
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Old 07-08-13, 21:32   #5
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I agree single cam for the vl but they do struggle to go past 400rwkw + on unleaded fuel while twincam 3l makes 500 to 550rwkw pump unleaded around 25psi ,
spend good $3000 $4000 on single cam still have the dizzy issues , lifters ect
while twimcam more driveable everyday even stock 25 head $300 can make nearly 450rwkw on pump fuel.
single cam really needs big cam make use of the head
+1 for twincam

parts to buy for the twincam are cheaper from the states
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Old 07-08-13, 22:12   #6
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I hate the cheating bull**** people go on with! The twin cam head are more efficient! Cost is not much difference when ur talking big power! It's up to what the owner wants! I love twin cams! Probly would of gone that way looking back! But 840hp (hydraulic cam) is proof the single cams do work! That's mild run in tuen, Still heaps more in it!
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Old 11-08-13, 19:50   #7
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whats most rwkw can single cam make on unleaded
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Old 11-08-13, 20:28   #8
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I have a single cam with a wade cam 125lb springs unported and it does alright has gone flat 10 & 142mph with only 18-19psi the way i see it unless you are going for the vl or nothing build its all personal e.g I chose to stay manual not auto. Twin cam is alot better but alot more expensive to setup as if you have a vl you already have a single cam head so spend the money on that it will be better than the stock rb26 head because you cant afford mods after all the machining costs etc. Big budget go the rb26 head with all the mods just my 2cents
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Old 11-08-13, 20:36   #9
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I prefer the OG factor of the single cam. If I cared about ultimate performance or bragging rights 26/30 would be the go but for something that makes good power for cheap you cant beat the SOHC for a street car imo.
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Old 11-08-13, 20:57   #10
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Originally Posted by CYNICL View Post
I prefer the OG factor of the single cam. If I cared about ultimate performance or bragging rights 26/30 would be the go but for something that makes good power for cheap you cant beat the SOHC for a street car imo.
Yeah i like the originality factor, also the fact that single cams can make tonnes of power on e85, theres more than a few now over 1000hp
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Old 11-08-13, 21:16   #11
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For the street with decent power, people keep thinking twin cam is more expensive - it's not! I built a 26/30 with just a set of cams and springs with a forged bottom end and it would outflow the majority of heavily ported single cam heads. The cost of porting, cam, springs, lifters, valves - vs a set of cams and springs and a head that can be had for 1k - it's not an expensive exercise for the street application.
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Old 12-08-13, 16:55   #12
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tomie cams set $500US and valve springs + seats + retainers $450 us dollars . cheap

don't even think full worked single cam wit roller rockers keep up to stock 26 head
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Old 12-08-13, 17:18   #13
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It won't flow as much... no.
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Old 12-08-13, 17:44   #14
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For the street with decent power, people keep thinking twin cam is more expensive - it's not! I built a 26/30 with just a set of cams and springs with a forged bottom end and it would outflow the majority of heavily ported single cam heads. The cost of porting, cam, springs, lifters, valves - vs a set of cams and springs and a head that can be had for 1k - it's not an expensive exercise for the street application.
What are the legalities like surrounding twin cam conversions? Do you need it engineered as an RB26? I assume they wouldn't see if its got a 30 bottom end or not. Also what kind of power were you making with the 26/30 with cams/springs if you don't mind me asking? Just curious how it goes value wise to a 30et.
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Old 12-08-13, 17:59   #15
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if you go twincam still wit the same engine number so wouldn't be anything hard to pass ,
twincam 3l making over 500rwkw on unleanded 98 fuel - cams average clean up ports ect
stock cams make just at 400rwkw - nice driveable vl
depending on turbo

just emission test and engineered same as would single cam

Last edited by elare69; 12-08-13 at 18:09.
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Old 12-08-13, 18:46   #16
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Haven't you got some cornicing to do you gronk..
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Old 12-08-13, 18:58   #17
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finished at 4pm today
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Old 12-08-13, 19:06   #18
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You ACT tradies tooo much cash money.
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Old 12-08-13, 19:17   #19
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single cam , vl come with single cam so leave it
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Old 12-08-13, 19:58   #20
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Soon as I hear twin cam or more so LS conversions to VL's these days I lose interest in the car. I can't pin point what it is that turns me off these options, I guess the SOHC is where it is at for me and gets the cred when it comes to VL's.
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Old 12-08-13, 21:02   #21
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if the maatouk boys such as GH can produce these amazing times with a SOHC , twin cam can stick it up its ass !

never been a fan on 26/30 , doesnt belong in a VL i say
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Old 12-08-13, 21:10   #22
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^^^ i kinda agree im a fan of single cam and after what gh747 has done with one i think the single can make the power 99.9% of willnever go past
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Old 12-08-13, 21:22   #23
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I have had all of them and really doesn't bother me either way as a modification is a modification.... Tell me how much of the high powered single cams have standard parts from Holden still? Anyways the 26 head coversion is cheap in gist of things, mine before rebuilding it has stock ports, valves, inlet and throttles and made 600rwkw through the glide and 9" and was still making power but blew a hose so we stopped. All the complete top end can be bought for $1000 minus the turbos and I'm sure you can't make that sort of power with the same bolt ons on a single cam. But at the end if the day you can't use the power on the street either way you go.
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Old 12-08-13, 21:27   #24
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I also like prefer looking at a wrinkle red rocker cover
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Old 12-08-13, 22:16   #25
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DOHC engines can be tuned for a wider range of torque with or without VCT than SOHC engines.

usually means smoother idle, earlier boost response, broad flatter torque curve.

sure total power may be the same in dyno figures but the graph will be vastly different.

They rev quicker due to less valve train weight mass needing to move.
this equates to less valve spring seat/open pressures which mean less wear'n'tear, less chance of a valve dropping.
Rb26 heads are solid, so top end gains are built in. RB25's are hydraulic but due to lower spring tensions can rev happily to 7500 in standard form.

Personally, I've tuned them all and 20/25/26/30 @ full song with a waste screamer dumping flames as you smack the next gear is the bomb regardless of the head.

Tin Cans just look bigger and therefore must be better
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