talldude Registered User
Posts: 1
(4/6/06 11:00 pm) Reply
VK commodore potential
Hello all i would like to go into this class of racing but i have a question to ask.
I have my old mans VK 6cyc commo which he gave to me he can no longer drive. i want to turn it into a race car because i like the old car but i want to put a vl turbo into the car.
i know it has to have the same amount of cycinders but seeing it was a nissan motor is it legal? or do i have to put a v6 motor in it?
If the motor was in an elgible car, then you can drop it in the VK. As the VL Turbo RB30 Nissan motor was run in a legal car,(the VL) you can therefore drop it into your 6 cylinder VK.
How do I know it's legit? Cause I have one in my Torana.
Re: VK commodore potential
As VK Commo came out with a 6 Cyl "inline" and "V8" you can run ANY inline 6 and V8 that HOLDEN put into thier cars... so VL 6 (with Turbo) is ok..but must run a 36mm restrictor which acording to most restrict power to @ 350 HP...but if you run a Holden 308, 304(VN to VT), Chev 307,327,350 and Gen 3 you can have as much HP as you like as long as you use the origanal Holden Block...heads etc are free and you dont have any weight penalties.... so it makes more sence to put in a V8 which is what most people do.... Scott Bucton, Col McCalister and the Vicary VC-VH commos go pretty good... which are all faster than my jigger... I have 503 HP by the way....
Btw.. you CANT run a V6... as VK didnt have a V6.
Hope this helps... maybe as a start buy an current race car similar to your VK as use your car as spares... cheaper in the long run...
Peter NSW # 60
LX Torana Chev 350
Race Driver = Empty Head, Heavy Foot - Ari Vatenan
Registered User
Posts: 289
(4/7/06 11:57 am) Reply
Re: VK commodore potential
The Vk is a early model car therefore no weight attached.
And no i don't want to bitch fight over year made and all that toss.
talldude Registered User
Posts: 2
(4/7/06 12:33 pm) Reply
Comment
thanks for the reply guys.
as was mentioned about the bottom end being free on a v8 would that also apply to the bottom end of the rb30? as i could graft a rb25 head onto it to make better use of the technology in the rb25 engine.
as for weight i can make it as lite as possible sounds good to me.
i prefer the rb30 motor as it is strong although a unrestricted v8 sounds great!
i would rather build the current vk i got i need another project as the datto 1600 i got is almost ready for targa use soon.
cant have too many projects
talldude Registered User
Posts: 3
(4/7/06 12:37 pm) Reply
comment
sorry i meant top end free
anyone know of a forum which deals with mod a vk commodore which doesnt have 15 year olds saying how cool the vl turbo is? i want some serious advice and helpful tips for the build up.
Re: comment
Yes, top end, twin cam 4 valve would be the way to go, wouldn't it Paul (anotherdatto)...
Sorry Talldude, problem with the internet and car forums is that they are ALL 15 Yo and telling you to "stick a pod and a 4' zoorst on and slam it",
Because, everyone knows that'll get 100 bhp/litre from your push rod, non crossflow cortina (For want of a better example).
My advise is take everything with a pinch of salt, until proven, and don't limit yourself to VK's for information. The fundamentals between engines are the same. Are the Black VK motors that different from the Red's from earlier cars?
One of the best things about IP is that you start with a hot street motor, and then build it up (it will cost more this way, but at least you get to drive)
Re: comment
Yep you could put the R33 Head on it if it fits...
one other thing to remember is if an engine is turbo'd it has a mulitiplication factor added against it which is 1.7, so a Nissan 3.0 x 1.7= 5.1L. with your engine (if possible?? ) you can stroke it out to 3.52 L which = 5.984 L. Our class has a 6L limit, so any Turbo engine has a max size of 3.52 L.
So your VK with a Turbo would be in the same class as all the other over 3L cars ie Big HP V8's and a certain Datsun 120Y Turbo
One other thing.... you can stroke the 3L Nissan (or any other Holden 6) out to what ever you like (non Turbo), and I bet if you worked hard enough you might be able to make more HP out of a Non Turbo Nissan 6 (RB30) than a restricted turbo'd 6. This is purly my own theory ... because if you can get over 600Hp from a V8 surely you can get more than 350 from an atmo 6??
BUT....one thing to remember....WEIGHT...a commo is not a light jigger... My old VC with a 202 was 1170KG. and its an uphill battle to fight agianst the RX7's with all that weight....
As I mentioned above... it is cheaper and quicker to buy an existing car....but if your heart is set in building it yourself ...good luck..I hope you get out there soon and have as much fun as possible....
Peter NSW # 60
LX Torana Chev 350
Race Driver = Empty Head, Heavy Foot - Ari Vatenan
Re: comment
You certainly can drop the RB25 head on it. That and injection are in my plans. It bolts straight on, if you get the right head. All you really need to do is move the belt tensioner and get a new cam belt made, then extend the belt covers.
I'm pretty sure you can get 350 out of an Atmo 6, though you'd likely need to inject and Motec it to do so. Mine still runs the RB30 head, with triple webers and it's got about 220 neddies. But it only weighs 1005 kg or so. Without this front row forward of a driver, that is.
As for a decent forum that talks about an RB25 head on an RB30 block, I did have one somewhere, but cant remember where the hell it was. I'll have a peek.
There's a 175.... yes I said 175 page thread in there about the very conversion. In that thread somewhere there's a poster called 'Cubes' who's done a PDF of the conversion. There's a link to it in his sig.
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