Right long story short I sold my 370z, so now I get to spend some time and money on the 300 :)

 

I'm planning a proper build now, but doing the heads first, so need some help on cams, looking at Jim Wolf tech r5 cams. As I'll be getting bigger turbos down the line. But what do people run? Any recommendations advice?

Get that rust sorted first!! ;)

Yeah it's down the bodyshop over Christmas for that, and paint and fi the new 99 spec bumper.

Yes!! :)

Question is how and when would cams benefit you? Cams are pretty subjective in terms of use and in a quad valve per cylinder engine like ours a simple increase in duration may not do very much. Unless you go all out with big cams, solid lifters and adjustable cam gears, I dunno what you'd gain. Bang for buck I recon a port/valve job might be more worthwhile. Time for some research I recon.

I've got to rebuild my heads anyway, valve stem seals are on the way out,

 

Not sure if I'll be going for oversized valves yet, depends on how much rooms in the budget, the r5 are the ones below solid lifters, tbh I like hydraulic lifters. On the std turbos they will probably do more harm then good, but on the turbos I want they should help me run decent boost, I want to build this zed to 600bhp, got carried away with the 370 and the build got shelved, but all good now.

With the rebuild are you going to use forged components or just keep it cheap?

Yeah I will go forged, just rebuilding the heads over the winter, will take the engine out next year change the turbos and go forged pistons I've still got a block that was checked and seemed strong enough for 90mm pistons, will probably go for conrods too, for peace of mind.

How many litres is 90mm?

I had done the maths a one point, but iirc it's about 3.2L

90mm bore

83mm stroke

6 cylinders

 

528cc per cylinder

3168cc overall

Bore^2 x (pi/4) x stroke x no. Cylinders

90^2 x 0.7854 x 83 x 6

Edited November 3, 201510 yr by (adl) phoenix

I'm looking forward to seeing plenty of pics of this build:punk:

I've still got a block that was checked and seemed strong enough for 90mm pistons.

 

How was it checked?

Not sure but it involved an ultrasonic scanner, and a computer graph, it looked for imperfections and weaknesses apparently

Not sure but it involved an ultrasonic scanner, and a computer graph, it looked for imperfections and weaknesses apparently

 

Sounds (excuse the pun!) the right approach. Have you see this info under the "The Engine Block" section regarding overbores?

 

http://www.superstreetonline.com/how-to/project-car/9909scc-project-nissan-300zx-part-4/

 

You can see how much (little) material is available in these photos of a stock VG block that has let go in No 6 bore.

 

 

Sounds (excuse the pun!) the right approach. Have you see this info under the "The Engine Block" section regarding overbores?

 

http://www.superstreetonline.com/how-to/project-car/9909scc-project-nissan-300zx-part-4/

 

You can see how much (little) material is available in these photos of a stock VG block that has let go in No 6 bore.

 

[ATTACH=CONFIG]91836[/ATTACH]

 

[ATTACH=CONFIG]91837[/ATTACH]

 

wow that really is thin, seems any boring out is not a great idea

Thanks that's great information, might look into cryogenic treatment, interesting they stopped at 89 mm maybe that would be safer in the long run.