Austarion

Im about to get my engine rebuilt (starion block VR4 head) but have just found a 4g64 motor, out of a 90ish L300. Now I still want to go twin cam and turbo.
Will the VR4 head bolt to the block, can I use over sized vr4 pistons, instead of expensive custom pistons?

Ive got a big turbo for it and want decent power out of it so Ill also need aftermarket rods also.



Please people who have built these engines.... I need your advice.



This is a pic of what Ive got atm
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Any help greatly appreciated
Jason

I am pretty certain you will have to use pistons made specifically for the longer stroke crank. Wiseco have forged pistons specfically for a stroker 4g63 with a twin cam head.

RiceThief wrote:I am pretty certain you will have to use pistons made specifically for the longer stroke crank. Wiseco have forged pistons specfically for a stroker 4g63 with a twin cam head.

I seem to remember that someone on this forum used 2mm oversized VR4 pistons.
I could understand the need for special pistons if you were using the g64 crank in a g63 block.

Actually you are right there with the 4G63 piston listed in the wiseco catelog as having the same compression height as the 4G64 listed with differences in the dish size and the bore size with the 4G64 having a 1.5mm larger bore as standard.

See this link http://www.slowboyracing.com/estore/home.php?cat=38

CP, Mahle, Manley, Ross and Wiseco make "off the shelf" pistons for using the 4G64 crank in the 4G63 block.

Also be aware the 2.4 is not really a 2.4 at all it's actually 2351cc.

mrb1 wrote:See this link http://www.slowboyracing.com/estore/home.php?cat=38

CP, Mahle, Manley, Ross and Wiseco make "off the shelf" pistons for using the 4G64 crank in the 4G63 block.

Also be aware the 2.4 is not really a 2.4 at all it's actually 2351cc.

Thats a great site!
Im now leaning towards using a 4g64 crank in a 4g63 block. The pistons aren't as expensive as I thought they would be.

JAS wrote:

mrb1 wrote:See this link http://www.slowboyracing.com/estore/home.php?cat=38

CP, Mahle, Manley, Ross and Wiseco make "off the shelf" pistons for using the 4G64 crank in the 4G63 block.

Also be aware the 2.4 is not really a 2.4 at all it's actually 2351cc.

Thats a great site!
Im now leaning towards using a 4g64 crank in a 4g63 block. The pistons aren't as expensive as I thought they would be.

Make sure you choose "6 bolt" stuff and make sure your piston pin size matches your rods.

Technically, 2351cc is a 2.4L ;)

If you use 2mm o/s VR4 pistons then it will bring the 4G64B out to 2378cc.

However, if you use the 2.4 crank in the 2l Starion block it will 'de-stroke' it to a 2.3L (2324cc with 86mm pistons; 2297cc with 85.5mm pistons)

NXTIME wrote:Technically, 2351cc is a 2.4L ;)

If you use 2mm o/s VR4 pistons then it will bring the 4G64B out to 2378cc.

However, if you use the 2.4 crank in the 2l Starion block it will 'de-stroke' it to a 2.3L (2324cc with 86mm pistons; 2297cc with 85.5mm pistons)

Thanks man, good to know.

Ive found a 7 bolt 4g64 crank. Will this fit into a 6 bolt, wide block? And then use a custom flywheel.

Can someone explain the 6 bolt/7 bolt difference? What motots had which and what models etc?

Get a 6 bolt crank it will work out cheaper in the long run.

JE also make stroker pistons. I use them in my racecar

ash

lowlancer wrote:Can someone explain the 6 bolt/7 bolt difference? What motors had which and what models etc?

6 bolt = generation 1

7 bolt = generation 2

they changed somewhere in late 1992 i believe. the differences are flywheel bolts obviously, piston (gudgeon) pin diameter (larger), big end journal width (narrower), extra drains back to the sump from head too in most cases..

Ive just found a 7 bolt wide block 4g64! :D
Do they have the oil squirters for under the pistons? Or at least room to have them installed?

Im going to buy it as its only $100 plus shipping which should work out at around $50.

You might want to double check that the Pressure plate is the same as a Starions ? Or that the Pressure plate fins are the same distance away from the Block as they are on the Starion setup, otherwise your going to be messing around with it for little gain

Ah no, 7Bolt usually don't have the extra gallery/material to enable oil squirter's to be fittted. DON"T use this block. get a 6 Bolt engine :beer