R34 Gtr Build

[BEN 0]

Excellant work bobby I commend you.

Thought I'd add I was working for APC in springwood couple years

ago, in which I had the pleasure of working on a Bathurst r31 skyline.

I was told by the owner that during the racing year of 1987 the budget was

3 million dollars. Replacement cost of the exhaust manifold on the car was surprisingly

10 thousand dollars!

[BOBBYr34]

Excellant work bobby I commend you.

Thought I'd add I was working for APC in springwood couple years

ago, in which I had the pleasure of working on a Bathurst r31 skyline.

I was told by the owner that during the racing year of 1987 the budget was

3 million dollars. Replacement cost of the exhaust manifold on the car was surprisingly

10 thousand dollars!

Thank you

Was that rod marklands old car the R31 rb20 turbo?

[BOBBYr34]

There has been a slight change in this build with cam selection. Previously mentioned we were using IN EX 260 10.25 lift Tomei now we will be using IN 270 10.25 lift EX 260 10.25 Lift still Tomei cams, John has done some further calculations and found this to be the best combination for the motor.

I will get more info on why he has decided on this Intake cam!!

[r33_racer]

Do you get a cam card with the Tomei camshafts?

If so do you know what the IVO, IVC, EVO and EVC degrees are?

[BOBBYr34]

Do you get a cam card with the Tomei camshafts?

If so do you know what the IVO, IVC, EVO and EVC degrees are?

Yes i have all the details on the cams.

The site link is below very helpful by tomei

http://www.tomei-p.co.jp/cam_spec/cam_spec_list-e.html

[NoFigJamHere]

Do you get a cam card with the Tomei camshafts?

If so do you know what the IVO, IVC, EVO and EVC degrees are?

Those figures should actually be decided on by the engine builder. The info they supply (Tomei etc) are for a given lobe centre figure. That why i laugh everytime i read some-one quoting cam sprocket degree adjustsments as cam settings. . Unless you know where the cams are set ie: lobe centres before you start playing with them your just guessing and hoping for the best...

Good to hear your getting close to start up Bobby

[r33_racer]

The manufacturer normally gives you the suggest LCA. I guess that would be on the cam card also?

[mico]

so he calculated that lift exactly ? i always thought having higher lift would get more air into the chambers and = more power with a bigger exhaust. even if its small duration and a little turb ? (im a noob lol)

[BOBBYr34]

We have also changed the headgasket to a 0.9mm Nismo Gt500 gasket from the 1.00 mm cometic, and the final deack height is +4 thou and using the 0.9mm head gasket we can achieve 33 thou squish.

[BOBBYr34]

The above pic shows the external oil supply tot he head , No oil will be supplied from the block. We can alos control the amount of oil for the head.

The above video, John has give a light skim of the head, he only took off 2 thou.

Motor is ready for final check and finished off very soon

[wedge_r34gtr]

Wow this was an astonishing read.

I can't wait to see the final product. Keep the information coming.

Edited March 8, 2012 by wedge_r34gtr

[BOBBYr34]

Wow this was an astonishing read.

I can't wait to see the final product. Keep the information coming.

Thank you

Well its not far now soon you will hear the beast

[nisskid]

Huge respect for this build, proven builds are great in practice and economic terms, but there is something to be said about the satisfaction of looking outside the box and creating solutions which push the boundaries. To succeed doing this is to properly achieve something, however just dumping a bunch of cash at a workshop to build your car to 400kw using the same methods that have been used a million times before, is just that, very little has been learned, and in my mind, very little has been achieved.

[BOBBYr34]

Huge respect for this build, proven builds are great in practice and economic terms, but there is something to be said about the satisfaction of looking outside the box and creating solutions which push the boundaries. To succeed doing this is to properly achieve something, however just dumping a bunch of cash at a workshop to build your car to 400kw using the same methods that have been used a million times before, is just that, very little has been learned, and in my mind, very little has been achieved.

Thank you for your comment.

Yes its not the money its all about getting it right

[bigmikespec]

We have also changed the headgasket to a 0.9mm Nismo Gt500 gasket from the 1.00 mm cometic, and the final deack height is +4 thou and using the 0.9mm head gasket we can achieve 33 thou squish.

With this quench distance, static compression 10:1 what boost pressure will be achievable to make the power you want?

[BOBBYr34]

With this quench distance, static compression 10:1 what boost pressure will be achievable to make the power you want?

Squish at 33 thou 10: 1 comp - boost in manifold will be 34psi and in the cylinder i think john said this will become like 15 psi.

In the documents with calculation there is a right about boost pressure.

[bigmikespec]

Bobby, early on you mentioned that John looked at making a custom plenum for this engine... can you go into any detail on what was proposed before you scrapped the idea?

I have been looking at "Lehmann" style plenums recently and wondering if this is what John was considering.

[bigmikespec]

Thanks Bobby email me if you get a chance.

[r33_racer]

There was a really good thread on the hydridz forums about a 'lehmann' style dual plenum inlet manifold being designed and made for an L28 I think it was. It was a long thread but had alot of drawings and CFD testing done with the guys design, think he got it all CNC machined out of two big chunks of billet in the end. Looked amazing!

Damn you Michael! I want to make one now!

[bigmikespec]

There was a really good thread on the hydridz forums about a 'lehmann' style dual plenum inlet manifold being designed and made for an L28 I think it was. It was a long thread but had alot of drawings and CFD testing done with the guys design, think he got it all CNC machined out of two big chunks of billet in the end. Looked amazing!

Damn you Michael! I want to make one now!

I read it!

I want to design one and I want you to make it... I am so time poor it is making me sick.