it never ends for me ..

 

looks like a may of blown a piston ...

 

soo its forged time looks like

but gonna be off the rd for a little time and going to

miss some shows looks like :(

 

any one got a good bottem end with forged parts they want to sell ?

ok ... the lot should be here tomorrow/fri ...

 

was just pre thinking

Piston Gapping

 

Just reading the tech info on the rings ...

 

87.5mm Bore = 3.444"

i have to multiply this by top ring application size .0050 ( turbo/nos ) this comes out at 0.017" ( 0.43mm )

 

to me this sounds a little small ?

im not sure but i think mark likes red.

now how u come up with that ?

Engine build so far

 

Wiseco Pistons 87.5

Eagle Con Rods

ARP Stud Bolts

ARP Main Bolts

ACL Main Bearings

ACL Rod Bearings

GT2560'r Tubs

AMS Manifolds

740cc Injectors

JD Tuning

Uprated VTC Springs

Gates Racing timing belt

Comtec Head gaskets

New Oil Pump

NA oil jets

New Timing Sprocket

OEM Gaskets set

PCV Valves

Heads Ported/Polished

Valves Re-cut/Seated

Block Bored out

Unortherdox Pulley set

Lightened flywheel

6 Paddle Clutch

Dual 10" Fan conversion

 

 

2nd Piston Ring gap Spot on

1st piston ring needed Gapping all 6 pistons needed doing

Edited June 10, 201213 yr by MarkDerby

 

A bit of Porting of the heads to match the manifolds bigger holes

Original are 29mm high x 34mm wide .. now 35mmx38mm

just a note that the holes look a little rough ... they have been smoothend off

 

Edited June 10, 201213 yr by MarkDerby

Fabulous pics and work Mark :clap:

 

More Porting

 

quite a bit of ally to take off to the edge of black marker

 

All Most Built

Edited June 10, 201213 yr by MarkDerby

Hi Mark, not sure if I have missed this in your thread, if you are using COMETIC mls head gaskets remember to have the head face and block deck machined to 50RA as specified by cometic. This is almost a mirror finish and is important otherwise you will get coolant leaks. I am building my forged motor with the same grocery list as you but will probably not use the cometics I have already bought and rather go for OEM HG as I am targeting max 450 BHP. Cheers

Very impressive Mark, looks great

Hi Mark, not sure if I have missed this in your thread, if you are using COMETIC mls head gaskets remember to have the head face and block deck machined to 50RA as specified by cometic. This is almost a mirror finish and is important otherwise you will get coolant leaks. I am building my forged motor with the same grocery list as you but will probably not use the cometics I have already bought and rather go for OEM HG as I am targeting max 450 BHP. Cheers

 

 

the Main block was checked me and the machine shop .. and all was level and clean so there was no need for decking ... but the heads did get skimmed and this all ready had to go to the next thickest gasket

if i had the block decked just for the sake of it means i would all so have to get the 3rd thickest gasket and this then starts to rely more

on that to have the compression at the correct ratio

How did you work out which thickness gasket you needed Mark?

 

Hypothetical question: you had an engine and had no idea if the heads/block had anything off before your ownership, how would you go about finding the correct thickness gasket to get the right compression ratio?

ok theres a few ways to determine the correct compression on the engine but 2 of them involve tools that are quite expensive

so the easy way is knowing that your block is stock .........

then when you have any work done to it Machine shop should/will tell you how much has been taken off Heads/Block

the manufactures have Set gaskets at different thickness's

 

lets say 1mm is stock ... then it will go by 1.2 1.4 1.6 so on

 

so no machined heads u will use Stock gasket ...

if the machine shop as taken 0.1mm from head u have to use 1.2mm gasket

problem u all so get is u are decreasing the compression ratio a little ...

so the best is to get a Close'st match as Poss

 

if your Heads/engine is unknown then u have to have the Volume/compression ratio tested

Machine shop will have those spacial tools to work that out

Thanks, i've wondered that for years but never asked

Piston Gapping

 

Just reading the tech info on the rings ...

 

87.5mm Bore = 3.444"

i have to multiply this by top ring application size .0050 ( turbo/nos ) this comes out at 0.017" ( 0.43mm )

 

to me this sounds a little small ?

 

no thats spot on Mark

Hi Mark, what I was trying to say is that the finish for composite head gaskets and Cometic steel head gaskets are not the same, I am not on about the trueness/flatness of the surface....50ra for mls gaskets is much smoother (almost mirror finish ) as apposed to normal head skim finish which you can see the machine marks. This is well known on the australian 300zx forums. Sorry for going on like a stuck record...I will shut the @#$% up now.

lol who said u was going on ....

 

its nice to have other ppl's input on things like this

All Built and ready to fit tomorrow

 

 

Jesus Effin Christ you made short work of that didn't you? Now were you careful with the liquid gasket so none can get into the oil or water ways and cause you more grief?:biggrin:

 

Nice work mate :thumbup1:

Well its Running as from 10pm it started on the first fire ... ( after priming for few mins ) ..

Spent the morning with vody and his gear box

didnt start getting my engine in till 4pm

 

just need to sort

Rad & Fans out

Prop shaft

Exhaust

bonnet

inside trim ( gear leaver )

 

Clean in side and out

Well its Running as from 10pm it started on the first fire ... ( after priming for few mins ) ..

Spent the morning with vody and his gear box

didnt start getting my engine in till 4pm

 

just need to sort

Rad & Fans out

Prop shaft

Exhaust

bonnet

inside trim ( gear leaver )

 

Clean in side and out

 

awesome bud, looks like we are both going to make pod in the zeds this weekend lol

Great work Mark, you certainly dont hang around! :thumbup:

Great work Mark, you certainly dont hang around! :thumbup:

 

That`s what I was thinking!! top job

Not much left to do now ..

 

Front bumper

Take of Ramps

Bonnet

ECU Refit

 

Clean and Polish :clap:

 

all i can say is i'm fooking nackard

back,hands really stiff shed loads of cuts,crazes

all over my hands ... lump on my head

 

 

and i'm falling a sleep just writing thiZZZZZZZZZzzzzzzzzzzzzzzzzzzz

Looks great, well done!!!