more evo head questions!

Lunacy · Post by **Lunacy** » Sun Jun 06, 2010 12:49 pm

stariontron wrote:does that mean i'd be better off using VR4 pistons, if they will bolt straight to the starion rods? or will that put the comp ratio out the window?

Yup vr4 pistons have a 21mm pin which is the same as starion rods iirc. Comp ratio will be fine.

enthuzed · Post by **enthuzed** » Sun Jun 06, 2010 10:33 pm

stariontron wrote:does that mean i'd be better off using VR4 pistons, if they will bolt straight to the starion rods? or will that put the comp ratio out the window?

VR4 & Starion pistons (Aust car not Jap import) have virtually the same crown cc (approx 14cc). The crown design is a different shape for the VR4 as its designed with clearances for 4 valves instead of 2.

thrash · Post by **thrash** » Mon Jun 07, 2010 11:25 am

what about the japo import ones? how are they different? higher compression i'm assuming?

Adriano · Post by **Adriano** » Thu Jun 17, 2010 6:45 pm

Jap vr4 evo ones are higher comp, and have ceramic coated crowns, plus they are quite cheap from ralliart

thrash · Post by **thrash** » Fri Jun 18, 2010 11:33 am

do you know what comp they are? aus spec vr4 is 7.8 i've been told, and aus spec staz is 7.5.. would the jap vr4 ones be 8.5?

stariontron · Post by **stariontron** » Sat Jun 19, 2010 8:28 pm

dwlee, cheers for the photos, how thick is that inlet manifold spacer youre using? i was hoping i could get away with a thinner spacer by removing *some* of the meat on the inlet manifold to allow the injectors to fit. also wondering what you think the best way to adapt the fuel rail to suit the new injector positions is.

dwlee · Post by **dwlee** » Sun Jun 20, 2010 4:17 pm

The spacer in the photos was original made to mate the evo4 manifold to a 4g61 head and as such is much thicker than is necessary for the evo1-3 head to evo4 manifold. The reason it is so thick (22mm) was to adapt the different port shape in the 4g61 head as smoothly as possible. The port in a 4g61 is slightly narrower and deeper than those in an evo head, but the port areas are approximately the same.

I am using the original fuel rail with the injectors in the head and not the manifold. The injector ports in the manifold are either welded closed or filled with high temperature epoxy. I couldn't see much point in using the injector ports in the manifold as the injector ports in the head would need to be filled and I did not want to do this in case I wanted to change heads.

stariontron · Post by **stariontron** » Mon Jun 21, 2010 5:19 am

ah ok, yeah i will definitely try for a thinner spacer, just to save on cost as much as anything else

on another note, why is it that i need to mess about with the oil pump, and swap balance shafts over anyway? whats to stop me from just swapping the pistons and crank pulley, and calling the bottom end done?

loom, AFM and ECU just showed up this morning :beer

Adriano · Post by **Adriano** » Mon Jun 21, 2010 9:01 pm

thrash wrote:do you know what comp they are? aus spec vr4 is 7.8 i've been told, and aus spec staz is 7.5.. would the jap vr4 ones be 8.5?

Yep, 8.5:1

Adriano · Post by **Adriano** » Mon Jun 21, 2010 9:03 pm

stariontron wrote:ah ok, yeah i will definitely try for a thinner spacer, just to save on cost as much as anything else

on another note, why is it that i need to mess about with the oil pump, and swap balance shafts over anyway? whats to stop me from just swapping the pistons and crank pulley, and calling the bottom end done?

loom, AFM and ECU just showed up this morning :beer

Because the twin cam timing belt is wider, requiring the wider oil pump drivepulley, longer oil pump drive. However it has been years since i did this, so my memory is a bit hazy

Xentro · Post by **Xentro** » Tue Jun 22, 2010 12:24 am

I just made an adapter plate and can use all 8 injectors if i wanted to..

Just 4 actually connected at the moment:

http://www.turbogarage.nl/2009/08/adapt ... -4g63.html

And some more since i'm to lazy to update my own site:

No welding involved.. And it fits like it was made for a Starion in the way that it goes around the brake booster. (LHD)

And yes it works.. the car is actually running and has already survived a couple laps on the Nordschleife.

I use a complete 7 bolt engine with an adapterplate to mount the stock gearbox.
a evo 4 intake, evo 6 turbo with home made manifold
a evo 3 wire loom that i modified so it suits a starion and use a evo 8 Ecu because they are easy to reprogram.
A evo 4 ecu is possibly the worst ecu to pick, because you can't reprogram them. Evo 1-3 can be chipped, evo 5-8 can be flashed.
Evo 9 up has different plugs.

stariontron · Post by **stariontron** » Tue Jun 22, 2010 5:15 am

Adriano wrote:
stariontron wrote:ah ok, yeah i will definitely try for a thinner spacer, just to save on cost as much as anything else

on another note, why is it that i need to mess about with the oil pump, and swap balance shafts over anyway? whats to stop me from just swapping the pistons and crank pulley, and calling the bottom end done?

loom, AFM and ECU just showed up this morning :beer
Because the twin cam timing belt is wider, requiring the wider oil pump drivepulley, longer oil pump drive. However it has been years since i did this, so my memory is a bit hazy

ah ok thanks. i guess i could try and get cheeky and run my starion oil pump and belt off the dohc pulley, but possibly not the best idea

does anyone know if the dohc 4g67 bottom end is similar to the dohc 4g63 in this respect? (crank, pulleys, oil pump etc). found one in bits for cheap

fugazi · Post by **fugazi** » Tue Jun 22, 2010 4:06 pm

Xentro wrote:... the car is actually running and has already survived a couple laps on the Nordschleife....

Bastard! That would be a dream cometrue.... :D
Laptime?

Nice work w.the mani-adaptor!

OLD FART · Post by **OLD FART** » Wed Jun 23, 2010 5:12 am

fugazi wrote:
Xentro wrote:... the car is actually running and has already survived a couple laps on the Nordschleife....

Bastard! That would be a dream cometrue.... :D
When I win LOTTO that's where i'm heading to get some lessons from the Queen of the Nurburgring Sabine Schmitz :D

PS I want to beat her Ford Transit van time

Xentro · Post by **Xentro** » Mon Jun 28, 2010 6:15 pm

OLD FART wrote:
fugazi wrote:
Xentro wrote:... the car is actually running and has already survived a couple laps on the Nordschleife....
Bastard! That would be a dream cometrue.... :D
When I win LOTTO that's where i'm heading to get some lessons from the Queen of the Nurburgring Sabine Schmitz :D

PS I want to beat her Ford Transit van time

Well she always seems to be there "cruising" the ring

Obviously faster then this :D

Austarion

more evo head questions!

Who is online