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mmt

Hi Guys,

I need to fit a 21 mm pin into the 20 mm Gti 6 rod. 
 

is it safe/possible to open up the small end diameter the extra 1mm? 
 

or should I open it an fit a 21 mm new busing? 
 

thanks. 

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Andy

As the o.e pin a press fit into the rod, I am not sure it is a bush .Others here will know better.My instinct is to re bush to 21mm if that is possible . 

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mmt

My instinct as well:-)

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petert

I assume the 21 pin is full floating? Then you really need to bore at least a 22.5mm hole (0.75mm wall thickness min) in the GTi6 rod. Is there enough material left to support the bush? What piston has a 21mm pin?

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mmt

Thanks ,

 

Should be enough material for 22,5 mm. 
 

the piston is full floating, JE made them. 

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wladimir031

GTi6 rod pin is 22mm ...

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B1ack_Mi16

1.9 Mi16 pins are 22mm, but GTi6 are indeed smaller. I believe 20mm is correct.

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mmt

Thanks guys. 
I used some custom rods for My JE pistons. All good now. 
 

anyone know How deep pockets I Would need to mill in Std. GTI6 pistons to make room for solid lifter higher lift cams?  
 

thanks. 

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welshpug

you can go +1mm safely on the standard crown, which is enough for mild fast road cams.

 

anything bigger will need an aftermarket piston with much deeper cutouts and a higher compression to suit the longer duration

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petert
Posted (edited)
11 hours ago, mmt said:

 

anyone know How deep pockets I Would need to mill in Std. GTI6 pistons to make room for solid lifter higher lift cams?  
 

 

That's a "how long is a piece of string" question. Until you've cut valve seats and done a trial assembly, you'll never know. Any solid cam worth installing will need the pockets deepened by at least 3-4mm. You'd probably want to cut open a piston and assess how much material is there.

Edited by petert

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welshpug

Bridgecraft engineering have done that for us already a good few years ago.

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wladimir031
On 8/3/2020 at 12:23 PM, B1ack_Mi16 said:

1.9 Mi16 pins are 22mm, but GTi6 are indeed smaller. I believe 20mm is correct.

GTi6 (xu10j4rs) pin is 22mm i measure today ... S16 pin is 23mm (xu10j4)

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