Fatz Goes Racing

[fatz]

crank!

[Gerg_R31]

Paint and Welsh plugs

[Gerg_R31]

Rods torqued to specs with arp lube and checked for size, up to 1 thou smaller, quick hone and now they're on size

[Gerg_R31]

And the bottom end is done (minus the tensioner relocation)

[fatz]

yea baby!

i am starting to get excited about this heap of shit again

[fatz]

top work greg

above and beyond as always

[johnbarry88]

looking good pete getting exciting

[fatz]

yea hopefully ill have alot more updates in teh comming months

[bigmikespec]

What was the fitment of the block brace like and what is the reason for it? Just to tie in the bottom the stop flex?

Edited January 3, 2012 by bigmikespec

[fatz]

Well I hope the brace does something cause the cost of machining to make it fit 1000 percent was high. Greg can confirm how it fits though

Does look purrty though

[fatz]

It toughens up the bottom end

Makes sense I guess especially when going a 3 liter with a modified Gtr sump that has bracing chopped out of it for a dry sump

[Gerg_R31]

Id assume the stock girdle strengthens to front to back flex, and this would strengthen the side flex

but I'dsuggest to speak with platinum racing for more details on it, im aware they have 2 products 1 is the brace (purple) the other is a brace and awd conversion (blue)

Sump rail and girdle are milled for exact height, the edges of the girdle are machined at an exact angle on a mill, 32 holes are drilled and tapped on the sump rail and girdle for it to bolt onto

[Gerg_R31]

Head cc'd at 69.6 cc's, aiming for 61.2 - 61.3 cc's

10 thou grind

[fatz]

yea baby bump that compression up to the right amount

[fatz]

at least this isnt another thread about a engine that the answer to everyone question is

"secret spec"

lol

[Gerg_R31]

Yeah but there is a good chance only 1 in 50 people will actually understand the details, which i have skipped some detail (i can add all the maths with all working out in as well if you like, would be a very long post )

Oh and I've ground 29 thou off so far, re cc'd it and its now at 64cc's which would make it 8.67:1CR (before with the 69.6 would have been 8.06:1CR)

[fatz]

go maths crazy

makes me feel smarter

[BOZ22N]

Great stuff Greg I love it.

Fatz your ok too hehe

[BOZ22N]

And Fatz you think Skylines are high maintenance wait till the little one pokes it's head out omg they eat any spare time whole.

I have an 11 week old and between work, house and him I am flat out and f**ked if I could tell you where all the time actually goes hehe but when they look, smile and laugh at you it's all worth it.

[Gerg_R31]

Well i took another 15 thou off, im at 62.1cc's

ok the comp ratio maths

SV

bore x stroke

86.5 x 86.5 / 4 = 1870.5625

x 3.142 x 85 = 499,571.13688

/ 1000 = 499.57113 (SV)

Engine cc's

4.99.57113 x 6 = 2,997.42678cc's

/ 1000 = 2.99743 litre

CV

Head gasket

88 x 88 / 4 = 1936

x 3.142 x 1.2 = 7299.4944

/ 1000 = 7.29949

Deck to top ring

86.5 x 86.5 / 4 = 1870.5625

x 3.142 x 6 = 35,263.84425

/ 1000 = 35.26384

85.65 x 85.65 / 4 = 1833.98063

x 3.142 x 6 = 34,574.20284

/ 1000 = 34.5742

35.26384 - 34.5742 = 0.68964

Piston dome volume

85.65 x 85.65 / 4 = 1833.98063

x 3.142 x 1.397 = 8,050.02689

/ 1000 = 8.05003

Volume around dome measures 1.8cc's

8.05003 - 1.8 = 6.25

piston above deck height

85.65 x 85.65 / 4 = 1833.98063

x 3.142 x 0.1016 = 585.4565

/ 1000 = 0.58546

7.29949 + 0.68964 - 6.25 - 0.58546 = 1.15367

+ Head cc's

69.6 + 1.15367 = 70.75367

+ 499.57113 = 570.3248

/ 70.75367 = 8.06 :1

Also did

64cc's = 8.67:1

62 = 8.91:1

60 = 9.17:1

61 = 9.04:1

61.5 = 8.97:1

61.3 = 8.99:1

61.2 = 9.01:1

So that how i worked out it needed between 61.2 and 61.3