RudeBoy - 11.3sec 400m

veecee · Post by **veecee** » Tue Jul 29, 2008 6:02 pm

uh - i think rudeboy is in the eastern cape???

thats a long way from benoni!!!

WarrenS13 · Post by **WarrenS13** » Tue Jul 29, 2008 6:48 pm

Ah....

Knew that, hehe

Um, nevermind, carry on...

RudeBoy · Post by **RudeBoy** » Tue Jul 29, 2008 9:30 pm

veecee wrote:uh - i think rudeboy is in the eastern cape???

thats a long way from benoni!!!

what gave it away: all the no plates

veecee · Post by **veecee** » Wed Jul 30, 2008 5:59 am

RudeBoy wrote:
veecee wrote:uh - i think rudeboy is in the eastern cape???

thats a long way from benoni!!!
what gave it away: all the no plates

perhaps?

WarrenS13 · Post by **WarrenS13** » Wed Jul 30, 2008 12:05 pm

Ja , duh

RudeBoy · Post by **RudeBoy** » Thu Sep 11, 2008 4:57 pm

Update:

well, after being delayed by customs, finally received valves and springs.

head assmebled: +- 60hrs of work by hand + 24hrs on the cnc later the head is now ported and fitted with supertech S/S intake and inconel exhuast valves, Tomei valve springs and a pair of Tomei cam-shafts.

engine still on stand, waiting for branch to get back from powerkote.

will take some more pics over the weekend...

Gary57 · Post by **Gary57** » Fri Sep 12, 2008 8:23 am

+ 24hrs on the cnc later the head is now ported

How did you do that?? More info please.

RB25SX · Post by **RB25SX** » Fri Sep 12, 2008 8:27 am

What size turbo are u using? I wana go single turbo on my RB26, but not sure whats the best size for good power and driveabilaty, thinking of T61 or T66.

RudeBoy · Post by **RudeBoy** » Fri Sep 12, 2008 8:41 am

RB25SX:

have a look at this site: http://www.turbobygarrett.com/turbobyga ... rgers.html

this is the one I'm using:

http://www.turbobygarrett.com/turbobyga ... 4568_2.htm

http://shop.rezlo.com/SA/index.php?act=viewCat&catId=4

Gary57 · Post by **Gary57** » Fri Sep 12, 2008 8:42 am

Rudeboy how did you port your head with a cnc?? Did you write a program just for your head??

RudeBoy · Post by **RudeBoy** » Fri Sep 12, 2008 9:22 am

yea Gary, have a friend with a cnc that wrote a program to do a portion of the head work that would have been sh*t by hand, kinda like this:

http://www.theoldone.com/components/cyl ... s/skyline/

RudeBoy · Post by **RudeBoy** » Fri Sep 12, 2008 9:24 am

p.s the cnc work had more to do with combustion chamber work and less with the actual porting....

Gary57 · Post by **Gary57** » Fri Sep 12, 2008 9:53 am

Oh ok.

What kind of gains do you think this head work will make??

RudeBoy · Post by **RudeBoy** » Fri Sep 12, 2008 10:21 am

more flow... (unshrouding the valves) - lower compression ratio at 8.6:1, that allows for more reliable high boost ( 2bar+) , should also allow more agressive timing, but i quess time will tell.

quote from "Endyn / theoldone" :

"Note that we've made some major changes to the factory's box-style combustion chamber. Our chamber design unshrouds the +.1mm oversize valves and our unique recessed quench pads completely eliminate the detonation-prone deep-stepped factory quench pads."

lotsa info available re this subject, but at the end of the day , you got to decide what you think will work for your application and how much of a risk you willing to take

RudeBoy · Post by **RudeBoy** » Fri Sep 12, 2008 10:23 am

should also enable us to "safely" add nitrous at a later stage