| bam88 |
| My friend told me that there was a RB30DETT. I was just wondering if he was joking with me or if it is true? And if it is true where could i get one and about how much would it cost? |
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| jberger |
| your friend is right , |
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| entelijint |
well... there is an RB30DETT... but it's custom made. it was never available in any vehicle from the factory which makes your friend half right.
mmmm 3L RB |
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| Blaine B. |
quote:
Originally posted by entelijint
well... there is an RB30DETT... but it's custom made. it was never available in any vehicle from the factory which makes your friend half right.
mmmm 3L RB
RB30DETT is a wicked setup for daily drivers. Ultimate power production king is still the RB26DET(T) |
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| sil_eighty |
yes its quite the feat to convert a SOHC into a DOHC monster...
it starts life as a sohc in a holden..then either the RB25 or RB26 head can be bolted on..the RB25 being the easier one of the two....the only problem with the 3.0ltr is u dont get the revs that u get from th RB25/26 setup...but the torque increase is quite substancial.... heres some info http://users.tpg.com.au/cobra30/twincam.htm like mentioned above its a total hybrid engine, and your best luck for parts is Austrailia, and for your source of information, they seem to be the only ones doing and runnin this conversion on a regular basis... try www.skylinesdownunder.com |
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| entelijint |
www.skylinesaustralia.com is the one i prefer... sau will accept your hotmail email addy whereas sdu needs an isp style addy to create an account.
sau and sdu have pretty much the same info anyways.:dunno:
as for RB26DETT being the ultimate power production king... i beg to differ. useful power, yes. most power, no. |
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| Blaine B. |
quote:
Originally posted by entelijint
www.skylinesaustralia.com is the one i prefer... sau will accept your hotmail email addy whereas sdu needs an isp style addy to create an account.
sau and sdu have pretty much the same info anyways.:dunno:
as for RB26DETT being the ultimate power production king... i beg to differ. useful power, yes. most power, no.
Of all the RB series engines you don't think the RB26DETT has the most power potential? How not? |
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| McFly |
there is a rb31 that you can make out of the rb26 if you wish.
or you can take the holden rb30 block and use that with a rb25/26 head.:)
if you want real information you go to gtr uk board.
sau is a bunch of ricers.
and sdu is pretty dead. |
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| Godzilla |
| how do you get a RB26 up to 3.1L, the biggest i've heard of is 2.9L and that don't leave you much cylender (spelling?) wall |
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| McFly |
apexi and crower have 2.9's
apexi's is for sale.
it uses a 87 mm piston which is safe.
crower is unknown and coming in january
The 3.1L is the os gliken 3l kit with 25mm spacer using 87mm pistons instead of 86mm.
or you could use a rb30 holden block and bore it. |
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| DarrylBleau |
quote:
Originally posted by entelijint
as for RB26DETT being the ultimate power production king... i beg to differ. useful power, yes. most power, no.
For a street car, you are better off with the RB26. Unless you are planning on running copper rings and rebuilding often, the 2.6 has better power potential (read: capable of ingesting more air at it's max rpm as dictated by sidewall stresses). |
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| Cobra_R |
I still cannot figure why anyone would ruin in my view the most wonderful engine ever built buy boring it out to 2.9l thats just my view.
I mean If you can kill the 2.6 block with aftermaret internals at 600 hp all I have to say is good luck. |
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| tokes |
| How is stroking the motor out to get a fatter powerband, spool a turbo quicker, and make the car more fun to drive ruining it? :confused: |
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| McFly |
100% stock engine has been used to 750 whp in the uk.
in the usa they have gone to 643 whp.
Stock crank has been used for 1450 whp.
and you cannot bore a rb26 to 2.9, hell you cant even safely bore it to 88mm(2mm over)without going to sleeves which no one does.
If you could bore to a 2.9 i would do it in an instant. that would make a 73.3 stroke with around a 95mm piston.
Would rev just the same as a rb26.
you dont ruin an engine by making it bigger:p
so i agree with tokes:thumbup:
A 77.7 stroke with a 87mm bore is the perfect compromise for the rb26. (makes an rb28) |
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| Soulfly |
quote:
Originally posted by Godzilla
cylender (spelling?)
That's Cylinder :p |
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| McFly |
| thanks treviyorer:) |
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| Cobra_R |
quote:
Originally posted by McFly
100% stock engine has been used to 750 whp in the uk.
in the usa they have gone to 643 whp.
Stock crank has been used for 1450 whp.
and you cannot bore a rb26 to 2.9, hell you cant even safely bore it to 88mm(2mm over)without going to sleeves which no one does.
If you could bore to a 2.9 i would do it in an instant. that would make a 73.3 stroke with around a 95mm piston.
Would rev just the same as a rb26.
you dont ruin an engine by making it bigger:p
so i agree with tokes:thumbup:
A 77.7 stroke with a 87mm bore is the perfect compromise for the rb26. (makes an rb28)
Bah I am a fucking purist ford lover what do I know:rolleyes: |
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| McFly |
dont they have a 300 ci inline 6?
that would kill any rb:lol: |
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| Cobra_R |
quote:
Originally posted by McFly
dont they have a 300 ci inline 6?
that would kill any rb:lol:
you would think that wouldnt ya lol
We all love are vehicles for differant reasons.
I love Ford because of there trucks the mustang and the 302 windsor the ford GT.
other then that I love Nissan for the 180sx 240sx 300zx (Z31 Z32)
350z
And the skylines. other than that I would not even look at Nissan.
Toyota for the Supra.
I like the RX7 but I fail to understand rotarys. :dunno:
But if I had a choice of vehicle to be daily driven.
A loaded diesel rig suits me. but my sunday driver would be the r34 nur edition skyline.
One of those things will happen the other never.:( |
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| tokes |
quote:
Originally posted by McFly
100% stock engine has been used to 750 whp in the uk.
in the usa they have gone to 643 whp.
Stock crank has been used for 1450 whp.
and you cannot bore a rb26 to 2.9, hell you cant even safely bore it to 88mm(2mm over)without going to sleeves which no one does.
If you could bore to a 2.9 i would do it in an instant. that would make a 73.3 stroke with around a 95mm piston.
Would rev just the same as a rb26.
you dont ruin an engine by making it bigger:p
so i agree with tokes:thumbup:
A 77.7 stroke with a 87mm bore is the perfect compromise for the rb26. (makes an rb28)
I really don't think a longer stroke is going to hurt it's ability to rev though. Honda B18's with an 87.2mm or 89mm stroke are able to turn 10K plus RPM's without issue. I know of one NDRA Turbo4 Racer who runs a 92mm stroker crank and shifts his motor at 10.5K and runs through the traps at over 11K RPM's. With such a large bore you're going to start creating a much heavier piston, and the squish/quench will be reduced so the motor will be less efficient, and start taking less timing/boost for any given octane level. There's going to be an optimum bore and stroke for a given displacement and cylinder head, it would just take waaay too much money to try and find it :) |
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| McFly |
high hp rb26's remove the quench area all together as they are prone to creating huge det.:)
os gliken rates their rb30 at 9500 rpm sure it can go higher but they don't recommend it. It is identical to a 2jz at that point.
As the standard withthe rb tuners it seems no one except hks is pushing into the 5000 foot/min piston speed. |
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| DarrylBleau |
quote:
Originally posted by McFly
If you could bore to a 2.9 i would do it in an instant. that would make a 73.3 stroke with around a 95mm piston.
Would rev just the same as a rb26.
Not quite, because the 95mm piston is going to weigh more than a piston made of the same material for the factory bore. Same piston speed, maybe (I didn't calculate it, so I'll take your word on that) but higher stress (sidewall, bearing) because of the heavier piston.
In other words, if you can rev to the same limit with a heavier piston and same piston speed, you could have revved even higher with the lighter piston. Assuming you can make effective use of the cylinder bore (can fill the cylinders with air) at this higher rev, the smaller displacement but higher revving engine has more top-end power potential (though perhaps less 'under the curve', depends).
To put some (fantasy) numbers on it, say you can rev your 2.6L to 10k, and the 3.0L to 7500. (Pulling numbers out of my ass, don't pay much attention, it's the theory that matters not the specific numbers here), at max rev the 2.6L is going through 26000L of air (all piston strokes considered, not just intake), while the 3.0L can go through 22500L. (What's that make, something like 6500L injested for the 2.6L versus 5625L for the 3.0L? Something like that). To make a 3.0L have as much top end potential as the 2.6L, you'd have to rev it to just over 8500.
Of course, if for whatever (magic?) reason you find you can bore out and run a 2.9L to 10k as well, it's going to make more top end (29000L). But a bigger piston is always (of course) going to weigh more than a smaller one, and kinetic energy considers mass and velocity, not just velocity, hence, all else being equal, a heavier piston is going to have a lower rev limit.
There's of course much more to take into consideration, under curve power being foremost, shift points, whether or not your tranny can shift at 10k, etc, but for raw top end potential, revs matter just as much as displacement. |
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| jdms13rhd |
RB30's are great. I drive one myself and son will have al the bugs worked out. If anyone wants to know more about them or wants to drive one just look me up. Ive got a twin turbo one and a single GT25R one aswell.
RB30 is a factory engine. Mostly avalable is ausi. Even the DR30 Skylines came with an RB30 in Ausi. To swap on a twin cam head takes an hour when the engine is out of the car and if you can do a head gasket anyone can convert there RB20 Skyline to an RB30. In y opinion to do the best combo I would use the neo cyl head or the 26 head. Both will work awesome and even the ausi's would say leave the single cam head on. They can stil make them bloddy fast over there!! I think the fastest RB30 is still a single cam head. |
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| McFly |
I like the point you raise Darryl:)
Theory is a bitch and a half.
would ~50 grams of pistons make much difference when they are still going to be lighter then the cast ones:p
but yes revving is the replacement for displacement. |
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| sil_eighty |
| why r ppl throwing stupid numbers out of nowhere... hks, trust, jun, tomei all make the 2.8kit as well as which strokes and bores, as well as a kniofe edge crank is included.... but a 1mm over bore is sufficient to give u a good increase to 2.7ltr and more than 1mm and u risk of runnin too thin cylinder walls, and u must sleeve. im goin to run 9:1 compression so i dont have to run as much boost to make over 500hp im thinking 1.2-1.4bar should easyily give me 550wrhp.... Os does make the kit but liek mentioned u cannot rev a long throw rod as much as the shorter one....so yah |
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