Low comp pistons std bore whats everyone using ????

[XR8tt]

What pistons are 8.5 compression with std bore ???
What is everyone using ??? Or recommend...
This is for turbo 1UZ engine running GT4202R.
I don't really want to bore oversize, unless I have to....

 

[Lextreme II]

How much boost you will be running and how many mile is your current motor?

 

[morris]

Ross Pistons

 

[XR8tt]

Its an Import motor from Japan.. I'v pulled it down and there's almost no bore wear, a light hone is all that required .. This is going to be a race engine in Celica...Runing GT4202R turbo ..
I can get Mahle 16 cc dish with 1.00 oversize...
Boost ?? As much as I can 25 /30 Lb...

 

[Lextreme II]

Mahle pistons for 1uzfe? Interesting... You should double check your bore before buying pistons. Its safer to bore and hone the block so u will get a perfect circle.

 

[XR8tt]

Mahle pistons for 1uzfe? Interesting... You should double check your bore before buying pistons. Its safer to bore and hone the block so u will get a perfect circle.

Yep I know all that, Its been mesured... but I'm pushing some power through this engine..

 

[XR8tt]

These are Mahle pistons sold here under ACL Australia...
http://www.aclperformance.com.au/Toyota1UZFEForgedPistonsLowComp.htm

 

[Lextreme II]

Are you sure they are Mahle? Last I heard they were Ross.

 

[XR8tt]

Are you sure they are Mahle? Last I heard they were Ross.

Yes we where just talking about that this afternoon.. They are all tied up in shares / take overs etc..... Yep could be Ross .... They'll be called ACL [race ?] forged pistons down here... Hope they compliment the Argo rods o/k....

 

[rms]

The ACL forged piston is 6mm wider across the pin bosses than the std 1uz piston so piston pin is subject to more bending load. Ross have an 'upgraded' piston pin.

BTW, any word on the availability, price of the upgraded piston pin David ?

 

[JustenGT8]

ACL = ROSS

there are better out there but nothing wrong with these....you do need the upgraded pin though as Erol says

 

[Lextreme II]

Ross 1uzfe upgrade pins price: $122 (yes that is wholesale) per set.

 

[4000GT]

CP Pistons also do a set... good prices with the exchange rate as it is.

 

[XR8tt]

CP Pistons also do a set... good prices with the exchange rate as it is.

Yes I have C.P's in my Dart block Ford...Through Quantum...
At the time they where $1800 a set....
Rocket have some too.. Of the shelf is easier if you have a minor disaster....KEEP the piston forgeing design number etc !!!!

 

[XR8tt]

Looks like I'll be using C.P as they are alittle cheaper than ACL's...
Imo a better piston...

 

[diob]

is that why

The ACL forged piston is 6mm wider across the pin bosses than the std 1uz piston so piston pin is subject to more bending load. Ross have an 'upgraded' piston pin.

BTW, any word on the availability, price of the upgraded piston pin David ?

Is that why the acl pistons keep cracking through the piston pin hole at 6200 rpm on the dot ?

Three sets of pistons in 3000 km. no boost big cams.

 

[rms]

Any chance of a pic , where are the cracks originating from ?

 

[diob]

no

they got binned a long time ago, a small crack from the centre of the gudgeon pin bottom toward the bottom of the piston. now that I think of my rpm estimate may be a long way out (I used the 4 cly factory tacho that was in the car).

I expect not more replies on this topic after this I have a more pressing issue.

What is the part number for the cp pistons and where from because I can't find them in the cp piston catalog

 

[XR8tt]

Go through http://www.qri.biz/ in Queensland.. I was surprised at the price... The Aussie dollar does make a difference!!!
They are custom and are not listed in their catalogue...